[ffvpx] Restore AVOptions and dictionary features

FFmpeg requires specific default values in AVCodecContext to be set. Instead of manually setting these each time we resync with upstream, let's use FFmpeg's own AVOptions which automatically sets all the values to their default.

3 files changed, 1995 insertions, 62 deletions

diff --git a/media/ffvpx/libavutil/dummy_funcs.c b/media/ffvpx/libavutil/dummy_funcs.c
index 2ea84a140..e579fcc89 100644
--- a/media/ffvpx/libavutil/dummy_funcs.c
+++ b/media/ffvpx/libavutil/dummy_funcs.c
@@ -5,7 +5,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "avutil.h"
-#include "opt.h"
 
 // cpu_internal.c
 int ff_get_cpu_flags_aarch64(void) { return 0; }
@@ -19,65 +18,4 @@ void ff_float_dsp_init_arm(AVFloatDSPContext *fdsp) {}
 void ff_float_dsp_init_ppc(AVFloatDSPContext *fdsp, int strict) {}
 void ff_float_dsp_init_mips(AVFloatDSPContext *fdsp) {}
 
-// opt.c
-int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags) { return 0; }
-void av_opt_set_defaults(void *s) {}
-void av_opt_set_defaults2(void *s, int mask, int flags) {}
-int av_set_options_string(void *ctx, const char *opts,
-                          const char *key_val_sep, const char *pairs_sep) { return 0; }
-int av_opt_set_from_string(void *ctx, const char *opts,
-                           const char *const *shorthand,
-                           const char *key_val_sep, const char *pairs_sep) { return 0; }
-void av_opt_free(void *obj) {}
-int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name) { return 0; }
-int av_opt_set_dict(void *obj, struct AVDictionary **options) { return 0; }
-int av_opt_set_dict2(void *obj, struct AVDictionary **options, int search_flags) { return 0; }
-int av_opt_get_key_value(const char **ropts,
-                         const char *key_val_sep, const char *pairs_sep,
-                         unsigned flags,
-                         char **rkey, char **rval) { return 0; }
-int av_opt_eval_flags (void *obj, const AVOption *o, const char *val, int       *flags_out) { return 0; }
-int av_opt_eval_int   (void *obj, const AVOption *o, const char *val, int       *int_out) { return 0; }
-int av_opt_eval_int64 (void *obj, const AVOption *o, const char *val, int64_t   *int64_out) { return 0; }
-int av_opt_eval_float (void *obj, const AVOption *o, const char *val, float     *float_out) { return 0; }
-int av_opt_eval_double(void *obj, const AVOption *o, const char *val, double    *double_out) { return 0; }
-int av_opt_eval_q     (void *obj, const AVOption *o, const char *val, AVRational *q_out) { return 0; }
-const AVOption *av_opt_find(void *obj, const char *name, const char *unit,
-                            int opt_flags, int search_flags) { return 0; }
-const AVOption *av_opt_find2(void *obj, const char *name, const char *unit,
-                             int opt_flags, int search_flags, void **target_obj) { return 0; }
-const AVOption *av_opt_next(const void *obj, const AVOption *prev) { return 0; }
-void *av_opt_child_next(void *obj, void *prev) { return 0; }
-const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *prev) { return 0; }
-int av_opt_set         (void *obj, const char *name, const char *val, int search_flags) { return 0; }
-int av_opt_set_int     (void *obj, const char *name, int64_t     val, int search_flags) { return 0; }
-int av_opt_set_double  (void *obj, const char *name, double      val, int search_flags) { return 0; }
-int av_opt_set_q       (void *obj, const char *name, AVRational  val, int search_flags) { return 0; }
-int av_opt_set_bin     (void *obj, const char *name, const uint8_t *val, int size, int search_flags) { return 0; }
-int av_opt_set_image_size(void *obj, const char *name, int w, int h, int search_flags) { return 0; }
-int av_opt_set_pixel_fmt (void *obj, const char *name, enum AVPixelFormat fmt, int search_flags) { return 0; }
-int av_opt_set_sample_fmt(void *obj, const char *name, enum AVSampleFormat fmt, int search_flags) { return 0; }
-int av_opt_set_video_rate(void *obj, const char *name, AVRational val, int search_flags) { return 0; }
-int av_opt_set_channel_layout(void *obj, const char *name, int64_t ch_layout, int search_flags) { return 0; }
-int av_opt_set_dict_val(void *obj, const char *name, const AVDictionary *val, int search_flags) { return 0; }
-int av_opt_get         (void *obj, const char *name, int search_flags, uint8_t **out_val) { return 0; }
-int av_opt_get_int     (void *obj, const char *name, int search_flags, int64_t *out_val) { return 0; }
-int av_opt_get_double  (void *obj, const char *name, int search_flags, double *out_val) { return 0; }
-int av_opt_get_q       (void *obj, const char *name, int search_flags, AVRational *out_val) { return 0; }
-int av_opt_get_image_size(void *obj, const char *name, int search_flags, int *w_out, int *h_out) { return 0; }
-int av_opt_get_pixel_fmt (void *obj, const char *name, int search_flags, enum AVPixelFormat *out_fmt) { return 0; }
-int av_opt_get_sample_fmt(void *obj, const char *name, int search_flags, enum AVSampleFormat *out_fmt) { return 0; }
-int av_opt_get_video_rate(void *obj, const char *name, int search_flags, AVRational *out_val) { return 0; }
-int av_opt_get_channel_layout(void *obj, const char *name, int search_flags, int64_t *ch_layout) { return 0; }
-int av_opt_get_dict_val(void *obj, const char *name, int search_flags, AVDictionary **out_val) { return 0; }
-void *av_opt_ptr(const AVClass *avclass, void *obj, const char *name) { return 0; }
-void av_opt_freep_ranges(AVOptionRanges **ranges) {}
-int av_opt_query_ranges(AVOptionRanges **b, void *obj, const char *key, int flags) { return 0; }
-int av_opt_copy(void *dest, const void *src) { return 0; }
-int av_opt_query_ranges_default(AVOptionRanges **b, void *obj, const char *key, int flags) { return 0; }
-int av_opt_is_set_to_default(void *obj, const AVOption *o) { return 0; }
-int av_opt_is_set_to_default_by_name(void *obj, const char *name, int search_flags) { return 0; }
-int av_opt_serialize(void *obj, int opt_flags, int flags, char **buffer,
-                     const char key_val_sep, const char pairs_sep) { return 0; }
-
 int av_hwframe_get_buffer(struct AVBufferRef* hwframe_ref, struct AVFrame* frame, int flags) { return 0; }
diff --git a/media/ffvpx/libavutil/moz.build b/media/ffvpx/libavutil/moz.build
index edc0888b1..a1c920f42 100644
--- a/media/ffvpx/libavutil/moz.build
+++ b/media/ffvpx/libavutil/moz.build
@@ -38,6 +38,7 @@ SOURCES += [
     'log2_tab.c',
     'mathematics.c',
     'mem.c',
+    'opt.c',
     'parseutils.c',
     'pixdesc.c',
     'pixelutils.c',
diff --git a/media/ffvpx/libavutil/opt.c b/media/ffvpx/libavutil/opt.c
new file mode 100644
index 000000000..cd16bd1d3
--- /dev/null
+++ b/media/ffvpx/libavutil/opt.c
@@ -0,0 +1,1994 @@
+/*
+ * AVOptions
+ * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * AVOptions
+ * @author Michael Niedermayer <michaelni@gmx.at>
+ */
+
+#include "avutil.h"
+#include "avassert.h"
+#include "avstring.h"
+#include "channel_layout.h"
+#include "common.h"
+#include "dict.h"
+#include "eval.h"
+#include "log.h"
+#include "parseutils.h"
+#include "pixdesc.h"
+#include "mathematics.h"
+#include "opt.h"
+#include "samplefmt.h"
+#include "bprint.h"
+
+#include <float.h>
+
+const AVOption *av_opt_next(const void *obj, const AVOption *last)
+{
+    const AVClass *class;
+    if (!obj)
+        return NULL;
+    class = *(const AVClass**)obj;
+    if (!last && class && class->option && class->option[0].name)
+        return class->option;
+    if (last && last[1].name)
+        return ++last;
+    return NULL;
+}
+
+static int read_number(const AVOption *o, const void *dst, double *num, int *den, int64_t *intnum)
+{
+    switch (o->type) {
+    case AV_OPT_TYPE_FLAGS:
+        *intnum = *(unsigned int*)dst;
+        return 0;
+    case AV_OPT_TYPE_PIXEL_FMT:
+        *intnum = *(enum AVPixelFormat *)dst;
+        return 0;
+    case AV_OPT_TYPE_SAMPLE_FMT:
+        *intnum = *(enum AVSampleFormat *)dst;
+        return 0;
+    case AV_OPT_TYPE_BOOL:
+    case AV_OPT_TYPE_INT:
+        *intnum = *(int *)dst;
+        return 0;
+    case AV_OPT_TYPE_CHANNEL_LAYOUT:
+    case AV_OPT_TYPE_DURATION:
+    case AV_OPT_TYPE_INT64:
+        *intnum = *(int64_t *)dst;
+        return 0;
+    case AV_OPT_TYPE_FLOAT:
+        *num = *(float *)dst;
+        return 0;
+    case AV_OPT_TYPE_DOUBLE:
+        *num = *(double *)dst;
+        return 0;
+    case AV_OPT_TYPE_RATIONAL:
+        *intnum = ((AVRational *)dst)->num;
+        *den    = ((AVRational *)dst)->den;
+        return 0;
+    case AV_OPT_TYPE_CONST:
+        *num = o->default_val.dbl;
+        return 0;
+    }
+    return AVERROR(EINVAL);
+}
+
+static int write_number(void *obj, const AVOption *o, void *dst, double num, int den, int64_t intnum)
+{
+    if (o->type != AV_OPT_TYPE_FLAGS &&
+        (o->max * den < num * intnum || o->min * den > num * intnum)) {
+        num = den ? num * intnum / den : (num * intnum ? INFINITY : NAN);
+        av_log(obj, AV_LOG_ERROR, "Value %f for parameter '%s' out of range [%g - %g]\n",
+               num, o->name, o->min, o->max);
+        return AVERROR(ERANGE);
+    }
+    if (o->type == AV_OPT_TYPE_FLAGS) {
+        double d = num*intnum/den;
+        if (d < -1.5 || d > 0xFFFFFFFF+0.5 || (llrint(d*256) & 255)) {
+            av_log(obj, AV_LOG_ERROR,
+                   "Value %f for parameter '%s' is not a valid set of 32bit integer flags\n",
+                   num*intnum/den, o->name);
+            return AVERROR(ERANGE);
+        }
+    }
+
+    switch (o->type) {
+    case AV_OPT_TYPE_PIXEL_FMT:
+        *(enum AVPixelFormat *)dst = llrint(num / den) * intnum;
+        break;
+    case AV_OPT_TYPE_SAMPLE_FMT:
+        *(enum AVSampleFormat *)dst = llrint(num / den) * intnum;
+        break;
+    case AV_OPT_TYPE_BOOL:
+    case AV_OPT_TYPE_FLAGS:
+    case AV_OPT_TYPE_INT:
+        *(int *)dst = llrint(num / den) * intnum;
+        break;
+    case AV_OPT_TYPE_DURATION:
+    case AV_OPT_TYPE_CHANNEL_LAYOUT:
+    case AV_OPT_TYPE_INT64:
+        *(int64_t *)dst = llrint(num / den) * intnum;
+        break;
+    case AV_OPT_TYPE_FLOAT:
+        *(float *)dst = num * intnum / den;
+        break;
+    case AV_OPT_TYPE_DOUBLE:
+        *(double    *)dst = num * intnum / den;
+        break;
+    case AV_OPT_TYPE_RATIONAL:
+    case AV_OPT_TYPE_VIDEO_RATE:
+        if ((int) num == num)
+            *(AVRational *)dst = (AVRational) { num *intnum, den };
+        else
+            *(AVRational *)dst = av_d2q(num * intnum / den, 1 << 24);
+        break;
+    default:
+        return AVERROR(EINVAL);
+    }
+    return 0;
+}
+
+static int hexchar2int(char c) {
+    if (c >= '0' && c <= '9')
+        return c - '0';
+    if (c >= 'a' && c <= 'f')
+        return c - 'a' + 10;
+    if (c >= 'A' && c <= 'F')
+        return c - 'A' + 10;
+    return -1;
+}
+
+static int set_string_binary(void *obj, const AVOption *o, const char *val, uint8_t **dst)
+{
+    int *lendst = (int *)(dst + 1);
+    uint8_t *bin, *ptr;
+    int len;
+
+    av_freep(dst);
+    *lendst = 0;
+
+    if (!val || !(len = strlen(val)))
+        return 0;
+
+    if (len & 1)
+        return AVERROR(EINVAL);
+    len /= 2;
+
+    ptr = bin = av_malloc(len);
+    if (!ptr)
+        return AVERROR(ENOMEM);
+    while (*val) {
+        int a = hexchar2int(*val++);
+        int b = hexchar2int(*val++);
+        if (a < 0 || b < 0) {
+            av_free(bin);
+            return AVERROR(EINVAL);
+        }
+        *ptr++ = (a << 4) | b;
+    }
+    *dst    = bin;
+    *lendst = len;
+
+    return 0;
+}
+
+static int set_string(void *obj, const AVOption *o, const char *val, uint8_t **dst)
+{
+    av_freep(dst);
+    *dst = av_strdup(val);
+    return *dst ? 0 : AVERROR(ENOMEM);
+}
+
+#define DEFAULT_NUMVAL(opt) ((opt->type == AV_OPT_TYPE_INT64 || \
+                              opt->type == AV_OPT_TYPE_CONST || \
+                              opt->type == AV_OPT_TYPE_FLAGS || \
+                              opt->type == AV_OPT_TYPE_INT)     \
+                             ? opt->default_val.i64             \
+                             : opt->default_val.dbl)
+
+static int set_string_number(void *obj, void *target_obj, const AVOption *o, const char *val, void *dst)
+{
+    int ret = 0;
+    int num, den;
+    char c;
+
+    if (sscanf(val, "%d%*1[:/]%d%c", &num, &den, &c) == 2) {
+        if ((ret = write_number(obj, o, dst, 1, den, num)) >= 0)
+            return ret;
+        ret = 0;
+    }
+
+    for (;;) {
+        int i = 0;
+        char buf[256];
+        int cmd = 0;
+        double d;
+        int64_t intnum = 1;
+
+        if (o->type == AV_OPT_TYPE_FLAGS) {
+            if (*val == '+' || *val == '-')
+                cmd = *(val++);
+            for (; i < sizeof(buf) - 1 && val[i] && val[i] != '+' && val[i] != '-'; i++)
+                buf[i] = val[i];
+            buf[i] = 0;
+        }
+
+        {
+            const AVOption *o_named = av_opt_find(target_obj, i ? buf : val, o->unit, 0, 0);
+            int res;
+            int ci = 0;
+            double const_values[64];
+            const char * const_names[64];
+            if (o_named && o_named->type == AV_OPT_TYPE_CONST)
+                d = DEFAULT_NUMVAL(o_named);
+            else {
+                if (o->unit) {
+                    for (o_named = NULL; o_named = av_opt_next(target_obj, o_named); ) {
+                        if (o_named->type == AV_OPT_TYPE_CONST &&
+                            o_named->unit &&
+                            !strcmp(o_named->unit, o->unit)) {
+                            if (ci + 6 >= FF_ARRAY_ELEMS(const_values)) {
+                                av_log(obj, AV_LOG_ERROR, "const_values array too small for %s\n", o->unit);
+                                return AVERROR_PATCHWELCOME;
+                            }
+                            const_names [ci  ] = o_named->name;
+                            const_values[ci++] = DEFAULT_NUMVAL(o_named);
+                        }
+                    }
+                }
+                const_names [ci  ] = "default";
+                const_values[ci++] = DEFAULT_NUMVAL(o);
+                const_names [ci  ] = "max";
+                const_values[ci++] = o->max;
+                const_names [ci  ] = "min";
+                const_values[ci++] = o->min;
+                const_names [ci  ] = "none";
+                const_values[ci++] = 0;
+                const_names [ci  ] = "all";
+                const_values[ci++] = ~0;
+                const_names [ci] = NULL;
+                const_values[ci] = 0;
+
+                res = av_expr_parse_and_eval(&d, i ? buf : val, const_names,
+                                            const_values, NULL, NULL, NULL, NULL, NULL, 0, obj);
+                if (res < 0) {
+                    av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\"\n", val);
+                    return res;
+                }
+            }
+        }
+        if (o->type == AV_OPT_TYPE_FLAGS) {
+            read_number(o, dst, NULL, NULL, &intnum);
+            if (cmd == '+')
+                d = intnum | (int64_t)d;
+            else if (cmd == '-')
+                d = intnum &~(int64_t)d;
+        }
+
+        if ((ret = write_number(obj, o, dst, d, 1, 1)) < 0)
+            return ret;
+        val += i;
+        if (!i || !*val)
+            return 0;
+    }
+
+    return 0;
+}
+
+static int set_string_image_size(void *obj, const AVOption *o, const char *val, int *dst)
+{
+    int ret;
+
+    if (!val || !strcmp(val, "none")) {
+        dst[0] =
+        dst[1] = 0;
+        return 0;
+    }
+    ret = av_parse_video_size(dst, dst + 1, val);
+    if (ret < 0)
+        av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as image size\n", val);
+    return ret;
+}
+
+static int set_string_video_rate(void *obj, const AVOption *o, const char *val, AVRational *dst)
+{
+    int ret;
+    if (!val) {
+        ret = AVERROR(EINVAL);
+    } else {
+        ret = av_parse_video_rate(dst, val);
+    }
+    if (ret < 0)
+        av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as video rate\n", val);
+    return ret;
+}
+
+static int set_string_color(void *obj, const AVOption *o, const char *val, uint8_t *dst)
+{
+    int ret;
+
+    if (!val) {
+        return 0;
+    } else {
+        ret = av_parse_color(dst, val, -1, obj);
+        if (ret < 0)
+            av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as color\n", val);
+        return ret;
+    }
+    return 0;
+}
+
+static const char *get_bool_name(int val)
+{
+    if (val < 0)
+        return "auto";
+    return val ? "true" : "false";
+}
+
+static int set_string_bool(void *obj, const AVOption *o, const char *val, int *dst)
+{
+    int n;
+
+    if (!val)
+        return 0;
+
+    if (!strcmp(val, "auto")) {
+        n = -1;
+    } else if (av_match_name(val, "true,y,yes,enable,enabled,on")) {
+        n = 1;
+    } else if (av_match_name(val, "false,n,no,disable,disabled,off")) {
+        n = 0;
+    } else {
+        char *end = NULL;
+        n = strtol(val, &end, 10);
+        if (val + strlen(val) != end)
+            goto fail;
+    }
+
+    if (n < o->min || n > o->max)
+        goto fail;
+
+    *dst = n;
+    return 0;
+
+fail:
+    av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as boolean\n", val);
+    return AVERROR(EINVAL);
+}
+
+static int set_string_fmt(void *obj, const AVOption *o, const char *val, uint8_t *dst,
+                          int fmt_nb, int ((*get_fmt)(const char *)), const char *desc)
+{
+    int fmt, min, max;
+
+    if (!val || !strcmp(val, "none")) {
+        fmt = -1;
+    } else {
+        fmt = get_fmt(val);
+        if (fmt == -1) {
+            char *tail;
+            fmt = strtol(val, &tail, 0);
+            if (*tail || (unsigned)fmt >= fmt_nb) {
+                av_log(obj, AV_LOG_ERROR,
+                       "Unable to parse option value \"%s\" as %s\n", val, desc);
+                return AVERROR(EINVAL);
+            }
+        }
+    }
+
+    min = FFMAX(o->min, -1);
+    max = FFMIN(o->max, fmt_nb-1);
+
+    // hack for compatibility with old ffmpeg
+    if(min == 0 && max == 0) {
+        min = -1;
+        max = fmt_nb-1;
+    }
+
+    if (fmt < min || fmt > max) {
+        av_log(obj, AV_LOG_ERROR,
+               "Value %d for parameter '%s' out of %s format range [%d - %d]\n",
+               fmt, o->name, desc, min, max);
+        return AVERROR(ERANGE);
+    }
+
+    *(int *)dst = fmt;
+    return 0;
+}
+
+static int set_string_pixel_fmt(void *obj, const AVOption *o, const char *val, uint8_t *dst)
+{
+    return set_string_fmt(obj, o, val, dst,
+                          AV_PIX_FMT_NB, av_get_pix_fmt, "pixel format");
+}
+
+static int set_string_sample_fmt(void *obj, const AVOption *o, const char *val, uint8_t *dst)
+{
+    return set_string_fmt(obj, o, val, dst,
+                          AV_SAMPLE_FMT_NB, av_get_sample_fmt, "sample format");
+}
+
+int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
+{
+    int ret = 0;
+    void *dst, *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+    if (!val && (o->type != AV_OPT_TYPE_STRING &&
+                 o->type != AV_OPT_TYPE_PIXEL_FMT && o->type != AV_OPT_TYPE_SAMPLE_FMT &&
+                 o->type != AV_OPT_TYPE_IMAGE_SIZE && o->type != AV_OPT_TYPE_VIDEO_RATE &&
+                 o->type != AV_OPT_TYPE_DURATION && o->type != AV_OPT_TYPE_COLOR &&
+                 o->type != AV_OPT_TYPE_CHANNEL_LAYOUT && o->type != AV_OPT_TYPE_BOOL))
+        return AVERROR(EINVAL);
+
+    if (o->flags & AV_OPT_FLAG_READONLY)
+        return AVERROR(EINVAL);
+
+    dst = ((uint8_t *)target_obj) + o->offset;
+    switch (o->type) {
+    case AV_OPT_TYPE_BOOL:
+        return set_string_bool(obj, o, val, dst);
+    case AV_OPT_TYPE_STRING:
+        return set_string(obj, o, val, dst);
+    case AV_OPT_TYPE_BINARY:
+        return set_string_binary(obj, o, val, dst);
+    case AV_OPT_TYPE_FLAGS:
+    case AV_OPT_TYPE_INT:
+    case AV_OPT_TYPE_INT64:
+    case AV_OPT_TYPE_FLOAT:
+    case AV_OPT_TYPE_DOUBLE:
+    case AV_OPT_TYPE_RATIONAL:
+        return set_string_number(obj, target_obj, o, val, dst);
+    case AV_OPT_TYPE_IMAGE_SIZE:
+        return set_string_image_size(obj, o, val, dst);
+    case AV_OPT_TYPE_VIDEO_RATE: {
+        AVRational tmp;
+        ret = set_string_video_rate(obj, o, val, &tmp);
+        if (ret < 0)
+            return ret;
+        return write_number(obj, o, dst, 1, tmp.den, tmp.num);
+    }
+    case AV_OPT_TYPE_PIXEL_FMT:
+        return set_string_pixel_fmt(obj, o, val, dst);
+    case AV_OPT_TYPE_SAMPLE_FMT:
+        return set_string_sample_fmt(obj, o, val, dst);
+    case AV_OPT_TYPE_DURATION:
+        if (!val) {
+            *(int64_t *)dst = 0;
+            return 0;
+        } else {
+            if ((ret = av_parse_time(dst, val, 1)) < 0)
+                av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as duration\n", val);
+            return ret;
+        }
+        break;
+    case AV_OPT_TYPE_COLOR:
+        return set_string_color(obj, o, val, dst);
+    case AV_OPT_TYPE_CHANNEL_LAYOUT:
+        if (!val || !strcmp(val, "none")) {
+            *(int64_t *)dst = 0;
+        } else {
+            int64_t cl = av_get_channel_layout(val);
+            if (!cl) {
+                av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as channel layout\n", val);
+                ret = AVERROR(EINVAL);
+            }
+            *(int64_t *)dst = cl;
+            return ret;
+        }
+        break;
+    }
+
+    av_log(obj, AV_LOG_ERROR, "Invalid option type.\n");
+    return AVERROR(EINVAL);
+}
+
+#define OPT_EVAL_NUMBER(name, opttype, vartype)                         \
+int av_opt_eval_ ## name(void *obj, const AVOption *o,                  \
+                         const char *val, vartype *name ## _out)        \
+{                                                                       \
+    if (!o || o->type != opttype || o->flags & AV_OPT_FLAG_READONLY)    \
+        return AVERROR(EINVAL);                                         \
+    return set_string_number(obj, obj, o, val, name ## _out);           \
+}
+
+OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)
+OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)
+OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)
+OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)
+OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)
+OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)
+
+static int set_number(void *obj, const char *name, double num, int den, int64_t intnum,
+                      int search_flags)
+{
+    void *dst, *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+
+    if (o->flags & AV_OPT_FLAG_READONLY)
+        return AVERROR(EINVAL);
+
+    dst = ((uint8_t *)target_obj) + o->offset;
+    return write_number(obj, o, dst, num, den, intnum);
+}
+
+int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
+{
+    return set_number(obj, name, 1, 1, val, search_flags);
+}
+
+int av_opt_set_double(void *obj, const char *name, double val, int search_flags)
+{
+    return set_number(obj, name, val, 1, 1, search_flags);
+}
+
+int av_opt_set_q(void *obj, const char *name, AVRational val, int search_flags)
+{
+    return set_number(obj, name, val.num, val.den, 1, search_flags);
+}
+
+int av_opt_set_bin(void *obj, const char *name, const uint8_t *val, int len, int search_flags)
+{
+    void *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+    uint8_t *ptr;
+    uint8_t **dst;
+    int *lendst;
+
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+
+    if (o->type != AV_OPT_TYPE_BINARY || o->flags & AV_OPT_FLAG_READONLY)
+        return AVERROR(EINVAL);
+
+    ptr = len ? av_malloc(len) : NULL;
+    if (len && !ptr)
+        return AVERROR(ENOMEM);
+
+    dst    = (uint8_t **)(((uint8_t *)target_obj) + o->offset);
+    lendst = (int *)(dst + 1);
+
+    av_free(*dst);
+    *dst    = ptr;
+    *lendst = len;
+    if (len)
+        memcpy(ptr, val, len);
+
+    return 0;
+}
+
+int av_opt_set_image_size(void *obj, const char *name, int w, int h, int search_flags)
+{
+    void *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+    if (o->type != AV_OPT_TYPE_IMAGE_SIZE) {
+        av_log(obj, AV_LOG_ERROR,
+               "The value set by option '%s' is not an image size.\n", o->name);
+        return AVERROR(EINVAL);
+    }
+    if (w<0 || h<0) {
+        av_log(obj, AV_LOG_ERROR,
+               "Invalid negative size value %dx%d for size '%s'\n", w, h, o->name);
+        return AVERROR(EINVAL);
+    }
+    *(int *)(((uint8_t *)target_obj)             + o->offset) = w;
+    *(int *)(((uint8_t *)target_obj+sizeof(int)) + o->offset) = h;
+    return 0;
+}
+
+int av_opt_set_video_rate(void *obj, const char *name, AVRational val, int search_flags)
+{
+    void *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+    if (o->type != AV_OPT_TYPE_VIDEO_RATE) {
+        av_log(obj, AV_LOG_ERROR,
+               "The value set by option '%s' is not a video rate.\n", o->name);
+        return AVERROR(EINVAL);
+    }
+    if (val.num <= 0 || val.den <= 0)
+        return AVERROR(EINVAL);
+    return set_number(obj, name, val.num, val.den, 1, search_flags);
+}
+
+static int set_format(void *obj, const char *name, int fmt, int search_flags,
+                      enum AVOptionType type, const char *desc, int nb_fmts)
+{
+    void *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0,
+                                     search_flags, &target_obj);
+    int min, max;
+
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+    if (o->type != type) {
+        av_log(obj, AV_LOG_ERROR,
+               "The value set by option '%s' is not a %s format", name, desc);
+        return AVERROR(EINVAL);
+    }
+
+    min = FFMAX(o->min, -1);
+    max = FFMIN(o->max, nb_fmts-1);
+
+    if (fmt < min || fmt > max) {
+        av_log(obj, AV_LOG_ERROR,
+               "Value %d for parameter '%s' out of %s format range [%d - %d]\n",
+               fmt, name, desc, min, max);
+        return AVERROR(ERANGE);
+    }
+    *(int *)(((uint8_t *)target_obj) + o->offset) = fmt;
+    return 0;
+}
+
+int av_opt_set_pixel_fmt(void *obj, const char *name, enum AVPixelFormat fmt, int search_flags)
+{
+    return set_format(obj, name, fmt, search_flags, AV_OPT_TYPE_PIXEL_FMT, "pixel", AV_PIX_FMT_NB);
+}
+
+int av_opt_set_sample_fmt(void *obj, const char *name, enum AVSampleFormat fmt, int search_flags)
+{
+    return set_format(obj, name, fmt, search_flags, AV_OPT_TYPE_SAMPLE_FMT, "sample", AV_SAMPLE_FMT_NB);
+}
+
+int av_opt_set_channel_layout(void *obj, const char *name, int64_t cl, int search_flags)
+{
+    void *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+    if (o->type != AV_OPT_TYPE_CHANNEL_LAYOUT) {
+        av_log(obj, AV_LOG_ERROR,
+               "The value set by option '%s' is not a channel layout.\n", o->name);
+        return AVERROR(EINVAL);
+    }
+    *(int64_t *)(((uint8_t *)target_obj) + o->offset) = cl;
+    return 0;
+}
+
+int av_opt_set_dict_val(void *obj, const char *name, const AVDictionary *val,
+                        int search_flags)
+{
+    void *target_obj;
+    AVDictionary **dst;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+    if (o->flags & AV_OPT_FLAG_READONLY)
+        return AVERROR(EINVAL);
+
+    dst = (AVDictionary **)(((uint8_t *)target_obj) + o->offset);
+    av_dict_free(dst);
+    av_dict_copy(dst, val, 0);
+
+    return 0;
+}
+
+static void format_duration(char *buf, size_t size, int64_t d)
+{
+    char *e;
+
+    av_assert0(size >= 25);
+    if (d < 0 && d != INT64_MIN) {
+        *(buf++) = '-';
+        size--;
+        d = -d;
+    }
+    if (d == INT64_MAX)
+        snprintf(buf, size, "INT64_MAX");
+    else if (d == INT64_MIN)
+        snprintf(buf, size, "INT64_MIN");
+    else if (d > (int64_t)3600*1000000)
+        snprintf(buf, size, "%"PRId64":%02d:%02d.%06d", d / 3600000000,
+                 (int)((d / 60000000) % 60),
+                 (int)((d / 1000000) % 60),
+                 (int)(d % 1000000));
+    else if (d > 60*1000000)
+        snprintf(buf, size, "%d:%02d.%06d",
+                 (int)(d / 60000000),
+                 (int)((d / 1000000) % 60),
+                 (int)(d % 1000000));
+    else
+        snprintf(buf, size, "%d.%06d",
+                 (int)(d / 1000000),
+                 (int)(d % 1000000));
+    e = buf + strlen(buf);
+    while (e > buf && e[-1] == '0')
+        *(--e) = 0;
+    if (e > buf && e[-1] == '.')
+        *(--e) = 0;
+}
+
+int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
+{
+    void *dst, *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+    uint8_t *bin, buf[128];
+    int len, i, ret;
+    int64_t i64;
+
+    if (!o || !target_obj || (o->offset<=0 && o->type != AV_OPT_TYPE_CONST))
+        return AVERROR_OPTION_NOT_FOUND;
+
+    dst = (uint8_t *)target_obj + o->offset;
+
+    buf[0] = 0;
+    switch (o->type) {
+    case AV_OPT_TYPE_BOOL:
+        ret = snprintf(buf, sizeof(buf), "%s", (char *)av_x_if_null(get_bool_name(*(int *)dst), "invalid"));
+        break;
+    case AV_OPT_TYPE_FLAGS:
+        ret = snprintf(buf, sizeof(buf), "0x%08X", *(int *)dst);
+        break;
+    case AV_OPT_TYPE_INT:
+        ret = snprintf(buf, sizeof(buf), "%d", *(int *)dst);
+        break;
+    case AV_OPT_TYPE_INT64:
+        ret = snprintf(buf, sizeof(buf), "%"PRId64, *(int64_t *)dst);
+        break;
+    case AV_OPT_TYPE_FLOAT:
+        ret = snprintf(buf, sizeof(buf), "%f", *(float *)dst);
+        break;
+    case AV_OPT_TYPE_DOUBLE:
+        ret = snprintf(buf, sizeof(buf), "%f", *(double *)dst);
+        break;
+    case AV_OPT_TYPE_VIDEO_RATE:
+    case AV_OPT_TYPE_RATIONAL:
+        ret = snprintf(buf, sizeof(buf), "%d/%d", ((AVRational *)dst)->num, ((AVRational *)dst)->den);
+        break;
+    case AV_OPT_TYPE_CONST:
+        ret = snprintf(buf, sizeof(buf), "%f", o->default_val.dbl);
+        break;
+    case AV_OPT_TYPE_STRING:
+        if (*(uint8_t **)dst) {
+            *out_val = av_strdup(*(uint8_t **)dst);
+        } else if (search_flags & AV_OPT_ALLOW_NULL) {
+            *out_val = NULL;
+            return 0;
+        } else {
+            *out_val = av_strdup("");
+        }
+        return *out_val ? 0 : AVERROR(ENOMEM);
+    case AV_OPT_TYPE_BINARY:
+        if (!*(uint8_t **)dst && (search_flags & AV_OPT_ALLOW_NULL)) {
+            *out_val = NULL;
+            return 0;
+        }
+        len = *(int *)(((uint8_t *)dst) + sizeof(uint8_t *));
+        if ((uint64_t)len * 2 + 1 > INT_MAX)
+            return AVERROR(EINVAL);
+        if (!(*out_val = av_malloc(len * 2 + 1)))
+            return AVERROR(ENOMEM);
+        if (!len) {
+            *out_val[0] = '\0';
+            return 0;
+        }
+        bin = *(uint8_t **)dst;
+        for (i = 0; i < len; i++)
+            snprintf(*out_val + i * 2, 3, "%02X", bin[i]);
+        return 0;
+    case AV_OPT_TYPE_IMAGE_SIZE:
+        ret = snprintf(buf, sizeof(buf), "%dx%d", ((int *)dst)[0], ((int *)dst)[1]);
+        break;
+    case AV_OPT_TYPE_PIXEL_FMT:
+        ret = snprintf(buf, sizeof(buf), "%s", (char *)av_x_if_null(av_get_pix_fmt_name(*(enum AVPixelFormat *)dst), "none"));
+        break;
+    case AV_OPT_TYPE_SAMPLE_FMT:
+        ret = snprintf(buf, sizeof(buf), "%s", (char *)av_x_if_null(av_get_sample_fmt_name(*(enum AVSampleFormat *)dst), "none"));
+        break;
+    case AV_OPT_TYPE_DURATION:
+        i64 = *(int64_t *)dst;
+        format_duration(buf, sizeof(buf), i64);
+        ret = strlen(buf); // no overflow possible, checked by an assert
+        break;
+    case AV_OPT_TYPE_COLOR:
+        ret = snprintf(buf, sizeof(buf), "0x%02x%02x%02x%02x",
+                       (int)((uint8_t *)dst)[0], (int)((uint8_t *)dst)[1],
+                       (int)((uint8_t *)dst)[2], (int)((uint8_t *)dst)[3]);
+        break;
+    case AV_OPT_TYPE_CHANNEL_LAYOUT:
+        i64 = *(int64_t *)dst;
+        ret = snprintf(buf, sizeof(buf), "0x%"PRIx64, i64);
+        break;
+    default:
+        return AVERROR(EINVAL);
+    }
+
+    if (ret >= sizeof(buf))
+        return AVERROR(EINVAL);
+    *out_val = av_strdup(buf);
+    return *out_val ? 0 : AVERROR(ENOMEM);
+}
+
+static int get_number(void *obj, const char *name, const AVOption **o_out, double *num, int *den, int64_t *intnum,
+                      int search_flags)
+{
+    void *dst, *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+    if (!o || !target_obj)
+        goto error;
+
+    dst = ((uint8_t *)target_obj) + o->offset;
+
+    if (o_out) *o_out= o;
+
+    return read_number(o, dst, num, den, intnum);
+
+error:
+    *den    =
+    *intnum = 0;
+    return -1;
+}
+
+int av_opt_get_int(void *obj, const char *name, int search_flags, int64_t *out_val)
+{
+    int64_t intnum = 1;
+    double num = 1;
+    int ret, den = 1;
+
+    if ((ret = get_number(obj, name, NULL, &num, &den, &intnum, search_flags)) < 0)
+        return ret;
+    *out_val = num * intnum / den;
+    return 0;
+}
+
+int av_opt_get_double(void *obj, const char *name, int search_flags, double *out_val)
+{
+    int64_t intnum = 1;
+    double num = 1;
+    int ret, den = 1;
+
+    if ((ret = get_number(obj, name, NULL, &num, &den, &intnum, search_flags)) < 0)
+        return ret;
+    *out_val = num * intnum / den;
+    return 0;
+}
+
+int av_opt_get_q(void *obj, const char *name, int search_flags, AVRational *out_val)
+{
+    int64_t intnum = 1;
+    double num = 1;
+    int ret, den = 1;
+
+    if ((ret = get_number(obj, name, NULL, &num, &den, &intnum, search_flags)) < 0)
+        return ret;
+
+    if (num == 1.0 && (int)intnum == intnum)
+        *out_val = (AVRational){intnum, den};
+    else
+        *out_val = av_d2q(num*intnum/den, 1<<24);
+    return 0;
+}
+
+int av_opt_get_image_size(void *obj, const char *name, int search_flags, int *w_out, int *h_out)
+{
+    void *dst, *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+    if (o->type != AV_OPT_TYPE_IMAGE_SIZE) {
+        av_log(obj, AV_LOG_ERROR,
+               "The value for option '%s' is not an image size.\n", name);
+        return AVERROR(EINVAL);
+    }
+
+    dst = ((uint8_t*)target_obj) + o->offset;
+    if (w_out) *w_out = *(int *)dst;
+    if (h_out) *h_out = *((int *)dst+1);
+    return 0;
+}
+
+int av_opt_get_video_rate(void *obj, const char *name, int search_flags, AVRational *out_val)
+{
+    int64_t intnum = 1;
+    double     num = 1;
+    int   ret, den = 1;
+
+    if ((ret = get_number(obj, name, NULL, &num, &den, &intnum, search_flags)) < 0)
+        return ret;
+
+    if (num == 1.0 && (int)intnum == intnum)
+        *out_val = (AVRational) { intnum, den };
+    else
+        *out_val = av_d2q(num * intnum / den, 1 << 24);
+    return 0;
+}
+
+static int get_format(void *obj, const char *name, int search_flags, int *out_fmt,
+                      enum AVOptionType type, const char *desc)
+{
+    void *dst, *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+    if (o->type != type) {
+        av_log(obj, AV_LOG_ERROR,
+               "The value for option '%s' is not a %s format.\n", desc, name);
+        return AVERROR(EINVAL);
+    }
+
+    dst = ((uint8_t*)target_obj) + o->offset;
+    *out_fmt = *(int *)dst;
+    return 0;
+}
+
+int av_opt_get_pixel_fmt(void *obj, const char *name, int search_flags, enum AVPixelFormat *out_fmt)
+{
+    return get_format(obj, name, search_flags, out_fmt, AV_OPT_TYPE_PIXEL_FMT, "pixel");
+}
+
+int av_opt_get_sample_fmt(void *obj, const char *name, int search_flags, enum AVSampleFormat *out_fmt)
+{
+    return get_format(obj, name, search_flags, out_fmt, AV_OPT_TYPE_SAMPLE_FMT, "sample");
+}
+
+int av_opt_get_channel_layout(void *obj, const char *name, int search_flags, int64_t *cl)
+{
+    void *dst, *target_obj;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+    if (o->type != AV_OPT_TYPE_CHANNEL_LAYOUT) {
+        av_log(obj, AV_LOG_ERROR,
+               "The value for option '%s' is not a channel layout.\n", name);
+        return AVERROR(EINVAL);
+    }
+
+    dst = ((uint8_t*)target_obj) + o->offset;
+    *cl = *(int64_t *)dst;
+    return 0;
+}
+
+int av_opt_get_dict_val(void *obj, const char *name, int search_flags, AVDictionary **out_val)
+{
+    void *target_obj;
+    AVDictionary *src;
+    const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
+
+    if (!o || !target_obj)
+        return AVERROR_OPTION_NOT_FOUND;
+    if (o->type != AV_OPT_TYPE_DICT)
+        return AVERROR(EINVAL);
+
+    src = *(AVDictionary **)(((uint8_t *)target_obj) + o->offset);
+    av_dict_copy(out_val, src, 0);
+
+    return 0;
+}
+
+int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name)
+{
+    const AVOption *field = av_opt_find(obj, field_name, NULL, 0, 0);
+    const AVOption *flag  = av_opt_find(obj, flag_name,
+                                        field ? field->unit : NULL, 0, 0);
+    int64_t res;
+
+    if (!field || !flag || flag->type != AV_OPT_TYPE_CONST ||
+        av_opt_get_int(obj, field_name, 0, &res) < 0)
+        return 0;
+    return res & flag->default_val.i64;
+}
+
+static void log_value(void *av_log_obj, int level, double d)
+{
+    if      (d == INT_MAX) {
+        av_log(av_log_obj, level, "INT_MAX");
+    } else if (d == INT_MIN) {
+        av_log(av_log_obj, level, "INT_MIN");
+    } else if (d == UINT32_MAX) {
+        av_log(av_log_obj, level, "UINT32_MAX");
+    } else if (d == (double)INT64_MAX) {
+        av_log(av_log_obj, level, "I64_MAX");
+    } else if (d == INT64_MIN) {
+        av_log(av_log_obj, level, "I64_MIN");
+    } else if (d == FLT_MAX) {
+        av_log(av_log_obj, level, "FLT_MAX");
+    } else if (d == FLT_MIN) {
+        av_log(av_log_obj, level, "FLT_MIN");
+    } else if (d == -FLT_MAX) {
+        av_log(av_log_obj, level, "-FLT_MAX");
+    } else if (d == -FLT_MIN) {
+        av_log(av_log_obj, level, "-FLT_MIN");
+    } else if (d == DBL_MAX) {
+        av_log(av_log_obj, level, "DBL_MAX");
+    } else if (d == DBL_MIN) {
+        av_log(av_log_obj, level, "DBL_MIN");
+    } else if (d == -DBL_MAX) {
+        av_log(av_log_obj, level, "-DBL_MAX");
+    } else if (d == -DBL_MIN) {
+        av_log(av_log_obj, level, "-DBL_MIN");
+    } else {
+        av_log(av_log_obj, level, "%g", d);
+    }
+}
+
+static const char *get_opt_const_name(void *obj, const char *unit, int64_t value)
+{
+    const AVOption *opt = NULL;
+
+    if (!unit)
+        return NULL;
+    while ((opt = av_opt_next(obj, opt)))
+        if (opt->type == AV_OPT_TYPE_CONST && !strcmp(opt->unit, unit) &&
+            opt->default_val.i64 == value)
+            return opt->name;
+    return NULL;
+}
+
+static char *get_opt_flags_string(void *obj, const char *unit, int64_t value)
+{
+    const AVOption *opt = NULL;
+    char flags[512];
+
+    flags[0] = 0;
+    if (!unit)
+        return NULL;
+    while ((opt = av_opt_next(obj, opt))) {
+        if (opt->type == AV_OPT_TYPE_CONST && !strcmp(opt->unit, unit) &&
+            opt->default_val.i64 & value) {
+            if (flags[0])
+                av_strlcatf(flags, sizeof(flags), "+");
+            av_strlcatf(flags, sizeof(flags), "%s", opt->name);
+        }
+    }
+    if (flags[0])
+        return av_strdup(flags);
+    return NULL;
+}
+
+static void opt_list(void *obj, void *av_log_obj, const char *unit,
+                     int req_flags, int rej_flags)
+{
+    const AVOption *opt = NULL;
+    AVOptionRanges *r;
+    int i;
+
+    while ((opt = av_opt_next(obj, opt))) {
+        if (!(opt->flags & req_flags) || (opt->flags & rej_flags))
+            continue;
+
+        /* Don't print CONST's on level one.
+         * Don't print anything but CONST's on level two.
+         * Only print items from the requested unit.
+         */
+        if (!unit && opt->type == AV_OPT_TYPE_CONST)
+            continue;
+        else if (unit && opt->type != AV_OPT_TYPE_CONST)
+            continue;
+        else if (unit && opt->type == AV_OPT_TYPE_CONST && strcmp(unit, opt->unit))
+            continue;
+        else if (unit && opt->type == AV_OPT_TYPE_CONST)
+            av_log(av_log_obj, AV_LOG_INFO, "     %-15s ", opt->name);
+        else
+            av_log(av_log_obj, AV_LOG_INFO, "  %s%-17s ",
+                   (opt->flags & AV_OPT_FLAG_FILTERING_PARAM) ? "" : "-",
+                   opt->name);
+
+        switch (opt->type) {
+            case AV_OPT_TYPE_FLAGS:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<flags>");
+                break;
+            case AV_OPT_TYPE_INT:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<int>");
+                break;
+            case AV_OPT_TYPE_INT64:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<int64>");
+                break;
+            case AV_OPT_TYPE_DOUBLE:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<double>");
+                break;
+            case AV_OPT_TYPE_FLOAT:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<float>");
+                break;
+            case AV_OPT_TYPE_STRING:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<string>");
+                break;
+            case AV_OPT_TYPE_RATIONAL:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<rational>");
+                break;
+            case AV_OPT_TYPE_BINARY:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<binary>");
+                break;
+            case AV_OPT_TYPE_IMAGE_SIZE:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<image_size>");
+                break;
+            case AV_OPT_TYPE_VIDEO_RATE:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<video_rate>");
+                break;
+            case AV_OPT_TYPE_PIXEL_FMT:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<pix_fmt>");
+                break;
+            case AV_OPT_TYPE_SAMPLE_FMT:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<sample_fmt>");
+                break;
+            case AV_OPT_TYPE_DURATION:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<duration>");
+                break;
+            case AV_OPT_TYPE_COLOR:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<color>");
+                break;
+            case AV_OPT_TYPE_CHANNEL_LAYOUT:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<channel_layout>");
+                break;
+            case AV_OPT_TYPE_BOOL:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<boolean>");
+                break;
+            case AV_OPT_TYPE_CONST:
+            default:
+                av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "");
+                break;
+        }
+        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_ENCODING_PARAM) ? 'E' : '.');
+        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_DECODING_PARAM) ? 'D' : '.');
+        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_FILTERING_PARAM)? 'F' : '.');
+        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_VIDEO_PARAM   ) ? 'V' : '.');
+        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_AUDIO_PARAM   ) ? 'A' : '.');
+        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');
+        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_EXPORT)         ? 'X' : '.');
+        av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_READONLY)       ? 'R' : '.');
+
+        if (opt->help)
+            av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);
+
+        if (av_opt_query_ranges(&r, obj, opt->name, AV_OPT_SEARCH_FAKE_OBJ) >= 0) {
+            switch (opt->type) {
+            case AV_OPT_TYPE_INT:
+            case AV_OPT_TYPE_INT64:
+            case AV_OPT_TYPE_DOUBLE:
+            case AV_OPT_TYPE_FLOAT:
+            case AV_OPT_TYPE_RATIONAL:
+                for (i = 0; i < r->nb_ranges; i++) {
+                    av_log(av_log_obj, AV_LOG_INFO, " (from ");
+                    log_value(av_log_obj, AV_LOG_INFO, r->range[i]->value_min);
+                    av_log(av_log_obj, AV_LOG_INFO, " to ");
+                    log_value(av_log_obj, AV_LOG_INFO, r->range[i]->value_max);
+                    av_log(av_log_obj, AV_LOG_INFO, ")");
+                }
+                break;
+            }
+            av_opt_freep_ranges(&r);
+        }
+
+        if (opt->type != AV_OPT_TYPE_CONST  &&
+            opt->type != AV_OPT_TYPE_BINARY &&
+                !((opt->type == AV_OPT_TYPE_COLOR      ||
+                   opt->type == AV_OPT_TYPE_IMAGE_SIZE ||
+                   opt->type == AV_OPT_TYPE_STRING     ||
+                   opt->type == AV_OPT_TYPE_VIDEO_RATE) &&
+                  !opt->default_val.str)) {
+            av_log(av_log_obj, AV_LOG_INFO, " (default ");
+            switch (opt->type) {
+            case AV_OPT_TYPE_BOOL:
+                av_log(av_log_obj, AV_LOG_INFO, "%s", (char *)av_x_if_null(get_bool_name(opt->default_val.i64), "invalid"));
+                break;
+            case AV_OPT_TYPE_FLAGS: {
+                char *def_flags = get_opt_flags_string(obj, opt->unit, opt->default_val.i64);
+                if (def_flags) {
+                    av_log(av_log_obj, AV_LOG_INFO, "%s", def_flags);
+                    av_freep(&def_flags);
+                } else {
+                    av_log(av_log_obj, AV_LOG_INFO, "%"PRIX64, opt->default_val.i64);
+                }
+                break;
+            }
+            case AV_OPT_TYPE_DURATION: {
+                char buf[25];
+                format_duration(buf, sizeof(buf), opt->default_val.i64);
+                av_log(av_log_obj, AV_LOG_INFO, "%s", buf);
+                break;
+            }
+            case AV_OPT_TYPE_INT:
+            case AV_OPT_TYPE_INT64: {
+                const char *def_const = get_opt_const_name(obj, opt->unit, opt->default_val.i64);
+                if (def_const)
+                    av_log(av_log_obj, AV_LOG_INFO, "%s", def_const);
+                else
+                    log_value(av_log_obj, AV_LOG_INFO, opt->default_val.i64);
+                break;
+            }
+            case AV_OPT_TYPE_DOUBLE:
+            case AV_OPT_TYPE_FLOAT:
+                log_value(av_log_obj, AV_LOG_INFO, opt->default_val.dbl);
+                break;
+            case AV_OPT_TYPE_RATIONAL: {
+                AVRational q = av_d2q(opt->default_val.dbl, INT_MAX);
+                av_log(av_log_obj, AV_LOG_INFO, "%d/%d", q.num, q.den); }
+                break;
+            case AV_OPT_TYPE_PIXEL_FMT:
+                av_log(av_log_obj, AV_LOG_INFO, "%s", (char *)av_x_if_null(av_get_pix_fmt_name(opt->default_val.i64), "none"));
+                break;
+            case AV_OPT_TYPE_SAMPLE_FMT:
+                av_log(av_log_obj, AV_LOG_INFO, "%s", (char *)av_x_if_null(av_get_sample_fmt_name(opt->default_val.i64), "none"));
+                break;
+            case AV_OPT_TYPE_COLOR:
+            case AV_OPT_TYPE_IMAGE_SIZE:
+            case AV_OPT_TYPE_STRING:
+            case AV_OPT_TYPE_VIDEO_RATE:
+                av_log(av_log_obj, AV_LOG_INFO, "\"%s\"", opt->default_val.str);
+                break;
+            case AV_OPT_TYPE_CHANNEL_LAYOUT:
+                av_log(av_log_obj, AV_LOG_INFO, "0x%"PRIx64, opt->default_val.i64);
+                break;
+            }
+            av_log(av_log_obj, AV_LOG_INFO, ")");
+        }
+
+        av_log(av_log_obj, AV_LOG_INFO, "\n");
+        if (opt->unit && opt->type != AV_OPT_TYPE_CONST)
+            opt_list(obj, av_log_obj, opt->unit, req_flags, rej_flags);
+    }
+}
+
+int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags)
+{
+    if (!obj)
+        return -1;
+
+    av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass **)obj)->class_name);
+
+    opt_list(obj, av_log_obj, NULL, req_flags, rej_flags);
+
+    return 0;
+}
+
+void av_opt_set_defaults(void *s)
+{
+    av_opt_set_defaults2(s, 0, 0);
+}
+
+void av_opt_set_defaults2(void *s, int mask, int flags)
+{
+    const AVOption *opt = NULL;
+    while ((opt = av_opt_next(s, opt))) {
+        void *dst = ((uint8_t*)s) + opt->offset;
+
+        if ((opt->flags & mask) != flags)
+            continue;
+
+        if (opt->flags & AV_OPT_FLAG_READONLY)
+            continue;
+
+        switch (opt->type) {
+            case AV_OPT_TYPE_CONST:
+                /* Nothing to be done here */
+                break;
+            case AV_OPT_TYPE_BOOL:
+            case AV_OPT_TYPE_FLAGS:
+            case AV_OPT_TYPE_INT:
+            case AV_OPT_TYPE_INT64:
+            case AV_OPT_TYPE_DURATION:
+            case AV_OPT_TYPE_CHANNEL_LAYOUT:
+            case AV_OPT_TYPE_PIXEL_FMT:
+            case AV_OPT_TYPE_SAMPLE_FMT:
+                write_number(s, opt, dst, 1, 1, opt->default_val.i64);
+                break;
+            case AV_OPT_TYPE_DOUBLE:
+            case AV_OPT_TYPE_FLOAT: {
+                double val;
+                val = opt->default_val.dbl;
+                write_number(s, opt, dst, val, 1, 1);
+            }
+            break;
+            case AV_OPT_TYPE_RATIONAL: {
+                AVRational val;
+                val = av_d2q(opt->default_val.dbl, INT_MAX);
+                write_number(s, opt, dst, 1, val.den, val.num);
+            }
+            break;
+            case AV_OPT_TYPE_COLOR:
+                set_string_color(s, opt, opt->default_val.str, dst);
+                break;
+            case AV_OPT_TYPE_STRING:
+                set_string(s, opt, opt->default_val.str, dst);
+                break;
+            case AV_OPT_TYPE_IMAGE_SIZE:
+                set_string_image_size(s, opt, opt->default_val.str, dst);
+                break;
+            case AV_OPT_TYPE_VIDEO_RATE:
+                set_string_video_rate(s, opt, opt->default_val.str, dst);
+                break;
+            case AV_OPT_TYPE_BINARY:
+                set_string_binary(s, opt, opt->default_val.str, dst);
+                break;
+            case AV_OPT_TYPE_DICT:
+                /* Cannot set defaults for these types */
+            break;
+        default:
+            av_log(s, AV_LOG_DEBUG, "AVOption type %d of option %s not implemented yet\n",
+                   opt->type, opt->name);
+        }
+    }
+}
+
+/**
+ * Store the value in the field in ctx that is named like key.
+ * ctx must be an AVClass context, storing is done using AVOptions.
+ *
+ * @param buf the string to parse, buf will be updated to point at the
+ * separator just after the parsed key/value pair
+ * @param key_val_sep a 0-terminated list of characters used to
+ * separate key from value
+ * @param pairs_sep a 0-terminated list of characters used to separate
+ * two pairs from each other
+ * @return 0 if the key/value pair has been successfully parsed and
+ * set, or a negative value corresponding to an AVERROR code in case
+ * of error:
+ * AVERROR(EINVAL) if the key/value pair cannot be parsed,
+ * the error code issued by av_opt_set() if the key/value pair
+ * cannot be set
+ */
+static int parse_key_value_pair(void *ctx, const char **buf,
+                                const char *key_val_sep, const char *pairs_sep)
+{
+    char *key = av_get_token(buf, key_val_sep);
+    char *val;
+    int ret;
+
+    if (!key)
+        return AVERROR(ENOMEM);
+
+    if (*key && strspn(*buf, key_val_sep)) {
+        (*buf)++;
+        val = av_get_token(buf, pairs_sep);
+        if (!val) {
+            av_freep(&key);
+            return AVERROR(ENOMEM);
+        }
+    } else {
+        av_log(ctx, AV_LOG_ERROR, "Missing key or no key/value separator found after key '%s'\n", key);
+        av_free(key);
+        return AVERROR(EINVAL);
+    }
+
+    av_log(ctx, AV_LOG_DEBUG, "Setting entry with key '%s' to value '%s'\n", key, val);
+
+    ret = av_opt_set(ctx, key, val, AV_OPT_SEARCH_CHILDREN);
+    if (ret == AVERROR_OPTION_NOT_FOUND)
+        av_log(ctx, AV_LOG_ERROR, "Key '%s' not found.\n", key);
+
+    av_free(key);
+    av_free(val);
+    return ret;
+}
+
+int av_set_options_string(void *ctx, const char *opts,
+                          const char *key_val_sep, const char *pairs_sep)
+{
+    int ret, count = 0;
+
+    if (!opts)
+        return 0;
+
+    while (*opts) {
+        if ((ret = parse_key_value_pair(ctx, &opts, key_val_sep, pairs_sep)) < 0)
+            return ret;
+        count++;
+
+        if (*opts)
+            opts++;
+    }
+
+    return count;
+}
+
+#define WHITESPACES " \n\t\r"
+
+static int is_key_char(char c)
+{
+    return (unsigned)((c | 32) - 'a') < 26 ||
+           (unsigned)(c - '0') < 10 ||
+           c == '-' || c == '_' || c == '/' || c == '.';
+}
+
+/**
+ * Read a key from a string.
+ *
+ * The key consists of is_key_char characters and must be terminated by a
+ * character from the delim string; spaces are ignored.
+ *
+ * @return  0 for success (even with ellipsis), <0 for failure
+ */
+static int get_key(const char **ropts, const char *delim, char **rkey)
+{
+    const char *opts = *ropts;
+    const char *key_start, *key_end;
+
+    key_start = opts += strspn(opts, WHITESPACES);
+    while (is_key_char(*opts))
+        opts++;
+    key_end = opts;
+    opts += strspn(opts, WHITESPACES);
+    if (!*opts || !strchr(delim, *opts))
+        return AVERROR(EINVAL);
+    opts++;
+    if (!(*rkey = av_malloc(key_end - key_start + 1)))
+        return AVERROR(ENOMEM);
+    memcpy(*rkey, key_start, key_end - key_start);
+    (*rkey)[key_end - key_start] = 0;
+    *ropts = opts;
+    return 0;
+}
+
+int av_opt_get_key_value(const char **ropts,
+                         const char *key_val_sep, const char *pairs_sep,
+                         unsigned flags,
+                         char **rkey, char **rval)
+{
+    int ret;
+    char *key = NULL, *val;
+    const char *opts = *ropts;
+
+    if ((ret = get_key(&opts, key_val_sep, &key)) < 0 &&
+        !(flags & AV_OPT_FLAG_IMPLICIT_KEY))
+        return AVERROR(EINVAL);
+    if (!(val = av_get_token(&opts, pairs_sep))) {
+        av_free(key);
+        return AVERROR(ENOMEM);
+    }
+    *ropts = opts;
+    *rkey  = key;
+    *rval  = val;
+    return 0;
+}
+
+int av_opt_set_from_string(void *ctx, const char *opts,
+                           const char *const *shorthand,
+                           const char *key_val_sep, const char *pairs_sep)
+{
+    int ret, count = 0;
+    const char *dummy_shorthand = NULL;
+    char *av_uninit(parsed_key), *av_uninit(value);
+    const char *key;
+
+    if (!opts)
+        return 0;
+    if (!shorthand)
+        shorthand = &dummy_shorthand;
+
+    while (*opts) {
+        ret = av_opt_get_key_value(&opts, key_val_sep, pairs_sep,
+                                   *shorthand ? AV_OPT_FLAG_IMPLICIT_KEY : 0,
+                                   &parsed_key, &value);
+        if (ret < 0) {
+            if (ret == AVERROR(EINVAL))
+                av_log(ctx, AV_LOG_ERROR, "No option name near '%s'\n", opts);
+            else
+                av_log(ctx, AV_LOG_ERROR, "Unable to parse '%s': %s\n", opts,
+                       av_err2str(ret));
+            return ret;
+        }
+        if (*opts)
+            opts++;
+        if (parsed_key) {
+            key = parsed_key;
+            while (*shorthand) /* discard all remaining shorthand */
+                shorthand++;
+        } else {
+            key = *(shorthand++);
+        }
+
+        av_log(ctx, AV_LOG_DEBUG, "Setting '%s' to value '%s'\n", key, value);
+        if ((ret = av_opt_set(ctx, key, value, 0)) < 0) {
+            if (ret == AVERROR_OPTION_NOT_FOUND)
+                av_log(ctx, AV_LOG_ERROR, "Option '%s' not found\n", key);
+            av_free(value);
+            av_free(parsed_key);
+            return ret;
+        }
+
+        av_free(value);
+        av_free(parsed_key);
+        count++;
+    }
+    return count;
+}
+
+void av_opt_free(void *obj)
+{
+    const AVOption *o = NULL;
+    while ((o = av_opt_next(obj, o))) {
+        switch (o->type) {
+        case AV_OPT_TYPE_STRING:
+        case AV_OPT_TYPE_BINARY:
+            av_freep((uint8_t *)obj + o->offset);
+            break;
+
+        case AV_OPT_TYPE_DICT:
+            av_dict_free((AVDictionary **)(((uint8_t *)obj) + o->offset));
+            break;
+
+        default:
+            break;
+        }
+    }
+}
+
+int av_opt_set_dict2(void *obj, AVDictionary **options, int search_flags)
+{
+    AVDictionaryEntry *t = NULL;
+    AVDictionary    *tmp = NULL;
+    int ret = 0;
+
+    if (!options)
+        return 0;
+
+    while ((t = av_dict_get(*options, "", t, AV_DICT_IGNORE_SUFFIX))) {
+        ret = av_opt_set(obj, t->key, t->value, search_flags);
+        if (ret == AVERROR_OPTION_NOT_FOUND)
+            ret = av_dict_set(&tmp, t->key, t->value, 0);
+        if (ret < 0) {
+            av_log(obj, AV_LOG_ERROR, "Error setting option %s to value %s.\n", t->key, t->value);
+            av_dict_free(&tmp);
+            return ret;
+        }
+        ret = 0;
+    }
+    av_dict_free(options);
+    *options = tmp;
+    return ret;
+}
+
+int av_opt_set_dict(void *obj, AVDictionary **options)
+{
+    return av_opt_set_dict2(obj, options, 0);
+}
+
+const AVOption *av_opt_find(void *obj, const char *name, const char *unit,
+                            int opt_flags, int search_flags)
+{
+    return av_opt_find2(obj, name, unit, opt_flags, search_flags, NULL);
+}
+
+const AVOption *av_opt_find2(void *obj, const char *name, const char *unit,
+                             int opt_flags, int search_flags, void **target_obj)
+{
+    const AVClass  *c;
+    const AVOption *o = NULL;
+
+    if(!obj)
+        return NULL;
+
+    c= *(AVClass**)obj;
+
+    if (!c)
+        return NULL;
+
+    if (search_flags & AV_OPT_SEARCH_CHILDREN) {
+        if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {
+            const AVClass *child = NULL;
+            while (child = av_opt_child_class_next(c, child))
+                if (o = av_opt_find2(&child, name, unit, opt_flags, search_flags, NULL))
+                    return o;
+        } else {
+            void *child = NULL;
+            while (child = av_opt_child_next(obj, child))
+                if (o = av_opt_find2(child, name, unit, opt_flags, search_flags, target_obj))
+                    return o;
+        }
+    }
+
+    while (o = av_opt_next(obj, o)) {
+        if (!strcmp(o->name, name) && (o->flags & opt_flags) == opt_flags &&
+            ((!unit && o->type != AV_OPT_TYPE_CONST) ||
+             (unit  && o->type == AV_OPT_TYPE_CONST && o->unit && !strcmp(o->unit, unit)))) {
+            if (target_obj) {
+                if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))
+                    *target_obj = obj;
+                else
+                    *target_obj = NULL;
+            }
+            return o;
+        }
+    }
+    return NULL;
+}
+
+void *av_opt_child_next(void *obj, void *prev)
+{
+    const AVClass *c = *(AVClass **)obj;
+    if (c->child_next)
+        return c->child_next(obj, prev);
+    return NULL;
+}
+
+const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *prev)
+{
+    if (parent->child_class_next)
+        return parent->child_class_next(prev);
+    return NULL;
+}
+
+void *av_opt_ptr(const AVClass *class, void *obj, const char *name)
+{
+    const AVOption *opt= av_opt_find2(&class, name, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ, NULL);
+    if(!opt)
+        return NULL;
+    return (uint8_t*)obj + opt->offset;
+}
+
+static int opt_size(enum AVOptionType type)
+{
+    switch(type) {
+    case AV_OPT_TYPE_BOOL:
+    case AV_OPT_TYPE_INT:
+    case AV_OPT_TYPE_FLAGS:
+        return sizeof(int);
+    case AV_OPT_TYPE_DURATION:
+    case AV_OPT_TYPE_CHANNEL_LAYOUT:
+    case AV_OPT_TYPE_INT64:
+        return sizeof(int64_t);
+    case AV_OPT_TYPE_DOUBLE:
+        return sizeof(double);
+    case AV_OPT_TYPE_FLOAT:
+        return sizeof(float);
+    case AV_OPT_TYPE_STRING:
+        return sizeof(uint8_t*);
+    case AV_OPT_TYPE_VIDEO_RATE:
+    case AV_OPT_TYPE_RATIONAL:
+        return sizeof(AVRational);
+    case AV_OPT_TYPE_BINARY:
+        return sizeof(uint8_t*) + sizeof(int);
+    case AV_OPT_TYPE_IMAGE_SIZE:
+        return sizeof(int[2]);
+    case AV_OPT_TYPE_PIXEL_FMT:
+        return sizeof(enum AVPixelFormat);
+    case AV_OPT_TYPE_SAMPLE_FMT:
+        return sizeof(enum AVSampleFormat);
+    case AV_OPT_TYPE_COLOR:
+        return 4;
+    }
+    return AVERROR(EINVAL);
+}
+
+int av_opt_copy(void *dst, const void *src)
+{
+    const AVOption *o = NULL;
+    const AVClass *c;
+    int ret = 0;
+
+    if (!src)
+        return AVERROR(EINVAL);
+
+    c = *(AVClass **)src;
+    if (!c || c != *(AVClass **)dst)
+        return AVERROR(EINVAL);
+
+    while ((o = av_opt_next(src, o))) {
+        void *field_dst = (uint8_t *)dst + o->offset;
+        void *field_src = (uint8_t *)src + o->offset;
+        uint8_t **field_dst8 = (uint8_t **)field_dst;
+        uint8_t **field_src8 = (uint8_t **)field_src;
+
+        if (o->type == AV_OPT_TYPE_STRING) {
+            if (*field_dst8 != *field_src8)
+                av_freep(field_dst8);
+            *field_dst8 = av_strdup(*field_src8);
+            if (*field_src8 && !*field_dst8)
+                ret = AVERROR(ENOMEM);
+        } else if (o->type == AV_OPT_TYPE_BINARY) {
+            int len = *(int *)(field_src8 + 1);
+            if (*field_dst8 != *field_src8)
+                av_freep(field_dst8);
+            *field_dst8 = av_memdup(*field_src8, len);
+            if (len && !*field_dst8) {
+                ret = AVERROR(ENOMEM);
+                len = 0;
+            }
+            *(int *)(field_dst8 + 1) = len;
+        } else if (o->type == AV_OPT_TYPE_CONST) {
+            // do nothing
+        } else if (o->type == AV_OPT_TYPE_DICT) {
+            AVDictionary **sdict = (AVDictionary **) field_src;
+            AVDictionary **ddict = (AVDictionary **) field_dst;
+            if (*sdict != *ddict)
+                av_dict_free(ddict);
+            *ddict = NULL;
+            av_dict_copy(ddict, *sdict, 0);
+            if (av_dict_count(*sdict) != av_dict_count(*ddict))
+                ret = AVERROR(ENOMEM);
+        } else {
+            int size = opt_size(o->type);
+            if (size < 0)
+                ret = size;
+            else
+                memcpy(field_dst, field_src, size);
+        }
+    }
+    return ret;
+}
+
+int av_opt_query_ranges(AVOptionRanges **ranges_arg, void *obj, const char *key, int flags)
+{
+    int ret;
+    const AVClass *c = *(AVClass**)obj;
+    int (*callback)(AVOptionRanges **, void *obj, const char *key, int flags) = NULL;
+
+    if (c->version > (52 << 16 | 11 << 8))
+        callback = c->query_ranges;
+
+    if (!callback)
+        callback = av_opt_query_ranges_default;
+
+    ret = callback(ranges_arg, obj, key, flags);
+    if (ret >= 0) {
+        if (!(flags & AV_OPT_MULTI_COMPONENT_RANGE))
+            ret = 1;
+        (*ranges_arg)->nb_components = ret;
+    }
+    return ret;
+}
+
+int av_opt_query_ranges_default(AVOptionRanges **ranges_arg, void *obj, const char *key, int flags)
+{
+    AVOptionRanges *ranges = av_mallocz(sizeof(*ranges));
+    AVOptionRange **range_array = av_mallocz(sizeof(void*));
+    AVOptionRange *range = av_mallocz(sizeof(*range));
+    const AVOption *field = av_opt_find(obj, key, NULL, 0, flags);
+    int ret;
+
+    *ranges_arg = NULL;
+
+    if (!ranges || !range || !range_array || !field) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    ranges->range = range_array;
+    ranges->range[0] = range;
+    ranges->nb_ranges = 1;
+    ranges->nb_components = 1;
+    range->is_range = 1;
+    range->value_min = field->min;
+    range->value_max = field->max;
+
+    switch (field->type) {
+    case AV_OPT_TYPE_BOOL:
+    case AV_OPT_TYPE_INT:
+    case AV_OPT_TYPE_INT64:
+    case AV_OPT_TYPE_PIXEL_FMT:
+    case AV_OPT_TYPE_SAMPLE_FMT:
+    case AV_OPT_TYPE_FLOAT:
+    case AV_OPT_TYPE_DOUBLE:
+    case AV_OPT_TYPE_DURATION:
+    case AV_OPT_TYPE_COLOR:
+    case AV_OPT_TYPE_CHANNEL_LAYOUT:
+        break;
+    case AV_OPT_TYPE_STRING:
+        range->component_min = 0;
+        range->component_max = 0x10FFFF; // max unicode value
+        range->value_min = -1;
+        range->value_max = INT_MAX;
+        break;
+    case AV_OPT_TYPE_RATIONAL:
+        range->component_min = INT_MIN;
+        range->component_max = INT_MAX;
+        break;
+    case AV_OPT_TYPE_IMAGE_SIZE:
+        range->component_min = 0;
+        range->component_max = INT_MAX/128/8;
+        range->value_min = 0;
+        range->value_max = INT_MAX/8;
+        break;
+    case AV_OPT_TYPE_VIDEO_RATE:
+        range->component_min = 1;
+        range->component_max = INT_MAX;
+        range->value_min = 1;
+        range->value_max = INT_MAX;
+        break;
+    default:
+        ret = AVERROR(ENOSYS);
+        goto fail;
+    }
+
+    *ranges_arg = ranges;
+    return 1;
+fail:
+    av_free(ranges);
+    av_free(range);
+    av_free(range_array);
+    return ret;
+}
+
+void av_opt_freep_ranges(AVOptionRanges **rangesp)
+{
+    int i;
+    AVOptionRanges *ranges = *rangesp;
+
+    if (!ranges)
+        return;
+
+    for (i = 0; i < ranges->nb_ranges * ranges->nb_components; i++) {
+        AVOptionRange *range = ranges->range[i];
+        if (range) {
+            av_freep(&range->str);
+            av_freep(&ranges->range[i]);
+        }
+    }
+    av_freep(&ranges->range);
+    av_freep(rangesp);
+}
+
+int av_opt_is_set_to_default(void *obj, const AVOption *o)
+{
+    int64_t i64;
+    double d, d2;
+    float f;
+    AVRational q;
+    int ret, w, h;
+    char *str;
+    void *dst;
+
+    if (!o || !obj)
+        return AVERROR(EINVAL);
+
+    dst = ((uint8_t*)obj) + o->offset;
+
+    switch (o->type) {
+    case AV_OPT_TYPE_CONST:
+        return 1;
+    case AV_OPT_TYPE_BOOL:
+    case AV_OPT_TYPE_FLAGS:
+    case AV_OPT_TYPE_PIXEL_FMT:
+    case AV_OPT_TYPE_SAMPLE_FMT:
+    case AV_OPT_TYPE_INT:
+    case AV_OPT_TYPE_CHANNEL_LAYOUT:
+    case AV_OPT_TYPE_DURATION:
+    case AV_OPT_TYPE_INT64:
+        read_number(o, dst, NULL, NULL, &i64);
+        return o->default_val.i64 == i64;
+    case AV_OPT_TYPE_STRING:
+        str = *(char **)dst;
+        if (str == o->default_val.str) //2 NULLs
+            return 1;
+        if (!str || !o->default_val.str) //1 NULL
+            return 0;
+        return !strcmp(str, o->default_val.str);
+    case AV_OPT_TYPE_DOUBLE:
+        read_number(o, dst, &d, NULL, NULL);
+        return o->default_val.dbl == d;
+    case AV_OPT_TYPE_FLOAT:
+        read_number(o, dst, &d, NULL, NULL);
+        f = o->default_val.dbl;
+        d2 = f;
+        return d2 == d;
+    case AV_OPT_TYPE_RATIONAL:
+        q = av_d2q(o->default_val.dbl, INT_MAX);
+        return !av_cmp_q(*(AVRational*)dst, q);
+    case AV_OPT_TYPE_BINARY: {
+        struct {
+            uint8_t *data;
+            int size;
+        } tmp = {0};
+        int opt_size = *(int *)((void **)dst + 1);
+        void *opt_ptr = *(void **)dst;
+        if (!opt_size && (!o->default_val.str || !strlen(o->default_val.str)))
+            return 1;
+        if (!opt_size ||  !o->default_val.str || !strlen(o->default_val.str ))
+            return 0;
+        if (opt_size != strlen(o->default_val.str) / 2)
+            return 0;
+        ret = set_string_binary(NULL, NULL, o->default_val.str, &tmp.data);
+        if (!ret)
+            ret = !memcmp(opt_ptr, tmp.data, tmp.size);
+        av_free(tmp.data);
+        return ret;
+    }
+    case AV_OPT_TYPE_DICT:
+        /* Binary and dict have not default support yet. Any pointer is not default. */
+        return !!(*(void **)dst);
+    case AV_OPT_TYPE_IMAGE_SIZE:
+        if (!o->default_val.str || !strcmp(o->default_val.str, "none"))
+            w = h = 0;
+        else if ((ret = av_parse_video_size(&w, &h, o->default_val.str)) < 0)
+            return ret;
+        return (w == *(int *)dst) && (h == *((int *)dst+1));
+    case AV_OPT_TYPE_VIDEO_RATE:
+        q = (AVRational){0, 0};
+        if (o->default_val.str) {
+            if ((ret = av_parse_video_rate(&q, o->default_val.str)) < 0)
+                return ret;
+        }
+        return !av_cmp_q(*(AVRational*)dst, q);
+    case AV_OPT_TYPE_COLOR: {
+        uint8_t color[4] = {0, 0, 0, 0};
+        if (o->default_val.str) {
+            if ((ret = av_parse_color(color, o->default_val.str, -1, NULL)) < 0)
+                return ret;
+        }
+        return !memcmp(color, dst, sizeof(color));
+    }
+    default:
+        av_log(obj, AV_LOG_WARNING, "Not supported option type: %d, option name: %s\n", o->type, o->name);
+        break;
+    }
+    return AVERROR_PATCHWELCOME;
+}
+
+int av_opt_is_set_to_default_by_name(void *obj, const char *name, int search_flags)
+{
+    const AVOption *o;
+    void *target;
+    if (!obj)
+        return AVERROR(EINVAL);
+    o = av_opt_find2(obj, name, NULL, 0, search_flags, &target);
+    if (!o)
+        return AVERROR_OPTION_NOT_FOUND;
+    return av_opt_is_set_to_default(target, o);
+}
+
+int av_opt_serialize(void *obj, int opt_flags, int flags, char **buffer,
+                     const char key_val_sep, const char pairs_sep)
+{
+    const AVOption *o = NULL;
+    uint8_t *buf;
+    AVBPrint bprint;
+    int ret, cnt = 0;
+    const char special_chars[] = {pairs_sep, key_val_sep, '\0'};
+
+    if (pairs_sep == '\0' || key_val_sep == '\0' || pairs_sep == key_val_sep ||
+        pairs_sep == '\\' || key_val_sep == '\\') {
+        av_log(obj, AV_LOG_ERROR, "Invalid separator(s) found.");
+        return AVERROR(EINVAL);
+    }
+
+    if (!obj || !buffer)
+        return AVERROR(EINVAL);
+
+    *buffer = NULL;
+    av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
+
+    while (o = av_opt_next(obj, o)) {
+        if (o->type == AV_OPT_TYPE_CONST)
+            continue;
+        if ((flags & AV_OPT_SERIALIZE_OPT_FLAGS_EXACT) && o->flags != opt_flags)
+            continue;
+        else if (((o->flags & opt_flags) != opt_flags))
+            continue;
+        if (flags & AV_OPT_SERIALIZE_SKIP_DEFAULTS && av_opt_is_set_to_default(obj, o) > 0)
+            continue;
+        if ((ret = av_opt_get(obj, o->name, 0, &buf)) < 0) {
+            av_bprint_finalize(&bprint, NULL);
+            return ret;
+        }
+        if (buf) {
+            if (cnt++)
+                av_bprint_append_data(&bprint, &pairs_sep, 1);
+            av_bprint_escape(&bprint, o->name, special_chars, AV_ESCAPE_MODE_BACKSLASH, 0);
+            av_bprint_append_data(&bprint, &key_val_sep, 1);
+            av_bprint_escape(&bprint, buf, special_chars, AV_ESCAPE_MODE_BACKSLASH, 0);
+            av_freep(&buf);
+        }
+    }
+    av_bprint_finalize(&bprint, buffer);
+    return 0;
+}