Revert "Update ffvpx code to 4.0.2"

1 files changed, 0 insertions, 873 deletions

diff --git a/media/ffvpx/libavutil/hwcontext.c b/media/ffvpx/libavutil/hwcontext.c
deleted file mode 100644
index 70c556eca..000000000
--- a/media/ffvpx/libavutil/hwcontext.c
+++ /dev/null
@@ -1,873 +0,0 @@
-/*
- * 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
- */
-
-#include "config.h"
-
-#include "buffer.h"
-#include "common.h"
-#include "hwcontext.h"
-#include "hwcontext_internal.h"
-#include "imgutils.h"
-#include "log.h"
-#include "mem.h"
-#include "pixdesc.h"
-#include "pixfmt.h"
-
-static const HWContextType * const hw_table[] = {
-#if CONFIG_CUDA
-    &ff_hwcontext_type_cuda,
-#endif
-#if CONFIG_D3D11VA
-    &ff_hwcontext_type_d3d11va,
-#endif
-#if CONFIG_LIBDRM
-    &ff_hwcontext_type_drm,
-#endif
-#if CONFIG_DXVA2
-    &ff_hwcontext_type_dxva2,
-#endif
-#if CONFIG_OPENCL
-    &ff_hwcontext_type_opencl,
-#endif
-#if CONFIG_QSV
-    &ff_hwcontext_type_qsv,
-#endif
-#if CONFIG_VAAPI
-    &ff_hwcontext_type_vaapi,
-#endif
-#if CONFIG_VDPAU
-    &ff_hwcontext_type_vdpau,
-#endif
-#if CONFIG_VIDEOTOOLBOX
-    &ff_hwcontext_type_videotoolbox,
-#endif
-#if CONFIG_MEDIACODEC
-    &ff_hwcontext_type_mediacodec,
-#endif
-    NULL,
-};
-
-static const char *const hw_type_names[] = {
-    [AV_HWDEVICE_TYPE_CUDA]   = "cuda",
-    [AV_HWDEVICE_TYPE_DRM]    = "drm",
-    [AV_HWDEVICE_TYPE_DXVA2]  = "dxva2",
-    [AV_HWDEVICE_TYPE_D3D11VA] = "d3d11va",
-    [AV_HWDEVICE_TYPE_OPENCL] = "opencl",
-    [AV_HWDEVICE_TYPE_QSV]    = "qsv",
-    [AV_HWDEVICE_TYPE_VAAPI]  = "vaapi",
-    [AV_HWDEVICE_TYPE_VDPAU]  = "vdpau",
-    [AV_HWDEVICE_TYPE_VIDEOTOOLBOX] = "videotoolbox",
-    [AV_HWDEVICE_TYPE_MEDIACODEC] = "mediacodec",
-};
-
-enum AVHWDeviceType av_hwdevice_find_type_by_name(const char *name)
-{
-    int type;
-    for (type = 0; type < FF_ARRAY_ELEMS(hw_type_names); type++) {
-        if (hw_type_names[type] && !strcmp(hw_type_names[type], name))
-            return type;
-    }
-    return AV_HWDEVICE_TYPE_NONE;
-}
-
-const char *av_hwdevice_get_type_name(enum AVHWDeviceType type)
-{
-    if (type > AV_HWDEVICE_TYPE_NONE &&
-        type < FF_ARRAY_ELEMS(hw_type_names))
-        return hw_type_names[type];
-    else
-        return NULL;
-}
-
-enum AVHWDeviceType av_hwdevice_iterate_types(enum AVHWDeviceType prev)
-{
-    enum AVHWDeviceType next;
-    int i, set = 0;
-    for (i = 0; hw_table[i]; i++) {
-        if (prev != AV_HWDEVICE_TYPE_NONE && hw_table[i]->type <= prev)
-            continue;
-        if (!set || hw_table[i]->type < next) {
-            next = hw_table[i]->type;
-            set = 1;
-        }
-    }
-    return set ? next : AV_HWDEVICE_TYPE_NONE;
-}
-
-static const AVClass hwdevice_ctx_class = {
-    .class_name = "AVHWDeviceContext",
-    .item_name  = av_default_item_name,
-    .version    = LIBAVUTIL_VERSION_INT,
-};
-
-static void hwdevice_ctx_free(void *opaque, uint8_t *data)
-{
-    AVHWDeviceContext *ctx = (AVHWDeviceContext*)data;
-
-    /* uninit might still want access the hw context and the user
-     * free() callback might destroy it, so uninit has to be called first */
-    if (ctx->internal->hw_type->device_uninit)
-        ctx->internal->hw_type->device_uninit(ctx);
-
-    if (ctx->free)
-        ctx->free(ctx);
-
-    av_buffer_unref(&ctx->internal->source_device);
-
-    av_freep(&ctx->hwctx);
-    av_freep(&ctx->internal->priv);
-    av_freep(&ctx->internal);
-    av_freep(&ctx);
-}
-
-AVBufferRef *av_hwdevice_ctx_alloc(enum AVHWDeviceType type)
-{
-    AVHWDeviceContext *ctx;
-    AVBufferRef *buf;
-    const HWContextType *hw_type = NULL;
-    int i;
-
-    for (i = 0; hw_table[i]; i++) {
-        if (hw_table[i]->type == type) {
-            hw_type = hw_table[i];
-            break;
-        }
-    }
-    if (!hw_type)
-        return NULL;
-
-    ctx = av_mallocz(sizeof(*ctx));
-    if (!ctx)
-        return NULL;
-
-    ctx->internal = av_mallocz(sizeof(*ctx->internal));
-    if (!ctx->internal)
-        goto fail;
-
-    if (hw_type->device_priv_size) {
-        ctx->internal->priv = av_mallocz(hw_type->device_priv_size);
-        if (!ctx->internal->priv)
-            goto fail;
-    }
-
-    if (hw_type->device_hwctx_size) {
-        ctx->hwctx = av_mallocz(hw_type->device_hwctx_size);
-        if (!ctx->hwctx)
-            goto fail;
-    }
-
-    buf = av_buffer_create((uint8_t*)ctx, sizeof(*ctx),
-                           hwdevice_ctx_free, NULL,
-                           AV_BUFFER_FLAG_READONLY);
-    if (!buf)
-        goto fail;
-
-    ctx->type     = type;
-    ctx->av_class = &hwdevice_ctx_class;
-
-    ctx->internal->hw_type = hw_type;
-
-    return buf;
-
-fail:
-    if (ctx->internal)
-        av_freep(&ctx->internal->priv);
-    av_freep(&ctx->internal);
-    av_freep(&ctx->hwctx);
-    av_freep(&ctx);
-    return NULL;
-}
-
-int av_hwdevice_ctx_init(AVBufferRef *ref)
-{
-    AVHWDeviceContext *ctx = (AVHWDeviceContext*)ref->data;
-    int ret;
-
-    if (ctx->internal->hw_type->device_init) {
-        ret = ctx->internal->hw_type->device_init(ctx);
-        if (ret < 0)
-            goto fail;
-    }
-
-    return 0;
-fail:
-    if (ctx->internal->hw_type->device_uninit)
-        ctx->internal->hw_type->device_uninit(ctx);
-    return ret;
-}
-
-static const AVClass hwframe_ctx_class = {
-    .class_name = "AVHWFramesContext",
-    .item_name  = av_default_item_name,
-    .version    = LIBAVUTIL_VERSION_INT,
-};
-
-static void hwframe_ctx_free(void *opaque, uint8_t *data)
-{
-    AVHWFramesContext *ctx = (AVHWFramesContext*)data;
-
-    if (ctx->internal->pool_internal)
-        av_buffer_pool_uninit(&ctx->internal->pool_internal);
-
-    if (ctx->internal->hw_type->frames_uninit)
-        ctx->internal->hw_type->frames_uninit(ctx);
-
-    if (ctx->free)
-        ctx->free(ctx);
-
-    av_buffer_unref(&ctx->internal->source_frames);
-
-    av_buffer_unref(&ctx->device_ref);
-
-    av_freep(&ctx->hwctx);
-    av_freep(&ctx->internal->priv);
-    av_freep(&ctx->internal);
-    av_freep(&ctx);
-}
-
-AVBufferRef *av_hwframe_ctx_alloc(AVBufferRef *device_ref_in)
-{
-    AVHWDeviceContext *device_ctx = (AVHWDeviceContext*)device_ref_in->data;
-    const HWContextType  *hw_type = device_ctx->internal->hw_type;
-    AVHWFramesContext *ctx;
-    AVBufferRef *buf, *device_ref = NULL;
-
-    ctx = av_mallocz(sizeof(*ctx));
-    if (!ctx)
-        return NULL;
-
-    ctx->internal = av_mallocz(sizeof(*ctx->internal));
-    if (!ctx->internal)
-        goto fail;
-
-    if (hw_type->frames_priv_size) {
-        ctx->internal->priv = av_mallocz(hw_type->frames_priv_size);
-        if (!ctx->internal->priv)
-            goto fail;
-    }
-
-    if (hw_type->frames_hwctx_size) {
-        ctx->hwctx = av_mallocz(hw_type->frames_hwctx_size);
-        if (!ctx->hwctx)
-            goto fail;
-    }
-
-    device_ref = av_buffer_ref(device_ref_in);
-    if (!device_ref)
-        goto fail;
-
-    buf = av_buffer_create((uint8_t*)ctx, sizeof(*ctx),
-                           hwframe_ctx_free, NULL,
-                           AV_BUFFER_FLAG_READONLY);
-    if (!buf)
-        goto fail;
-
-    ctx->av_class   = &hwframe_ctx_class;
-    ctx->device_ref = device_ref;
-    ctx->device_ctx = device_ctx;
-    ctx->format     = AV_PIX_FMT_NONE;
-    ctx->sw_format  = AV_PIX_FMT_NONE;
-
-    ctx->internal->hw_type = hw_type;
-
-    return buf;
-
-fail:
-    if (device_ref)
-        av_buffer_unref(&device_ref);
-    if (ctx->internal)
-        av_freep(&ctx->internal->priv);
-    av_freep(&ctx->internal);
-    av_freep(&ctx->hwctx);
-    av_freep(&ctx);
-    return NULL;
-}
-
-static int hwframe_pool_prealloc(AVBufferRef *ref)
-{
-    AVHWFramesContext *ctx = (AVHWFramesContext*)ref->data;
-    AVFrame **frames;
-    int i, ret = 0;
-
-    frames = av_mallocz_array(ctx->initial_pool_size, sizeof(*frames));
-    if (!frames)
-        return AVERROR(ENOMEM);
-
-    for (i = 0; i < ctx->initial_pool_size; i++) {
-        frames[i] = av_frame_alloc();
-        if (!frames[i])
-            goto fail;
-
-        ret = av_hwframe_get_buffer(ref, frames[i], 0);
-        if (ret < 0)
-            goto fail;
-    }
-
-fail:
-    for (i = 0; i < ctx->initial_pool_size; i++)
-        av_frame_free(&frames[i]);
-    av_freep(&frames);
-
-    return ret;
-}
-
-int av_hwframe_ctx_init(AVBufferRef *ref)
-{
-    AVHWFramesContext *ctx = (AVHWFramesContext*)ref->data;
-    const enum AVPixelFormat *pix_fmt;
-    int ret;
-
-    if (ctx->internal->source_frames) {
-        /* A derived frame context is already initialised. */
-        return 0;
-    }
-
-    /* validate the pixel format */
-    for (pix_fmt = ctx->internal->hw_type->pix_fmts; *pix_fmt != AV_PIX_FMT_NONE; pix_fmt++) {
-        if (*pix_fmt == ctx->format)
-            break;
-    }
-    if (*pix_fmt == AV_PIX_FMT_NONE) {
-        av_log(ctx, AV_LOG_ERROR,
-               "The hardware pixel format '%s' is not supported by the device type '%s'\n",
-               av_get_pix_fmt_name(ctx->format), ctx->internal->hw_type->name);
-        return AVERROR(ENOSYS);
-    }
-
-    /* validate the dimensions */
-    ret = av_image_check_size(ctx->width, ctx->height, 0, ctx);
-    if (ret < 0)
-        return ret;
-
-    /* format-specific init */
-    if (ctx->internal->hw_type->frames_init) {
-        ret = ctx->internal->hw_type->frames_init(ctx);
-        if (ret < 0)
-            goto fail;
-    }
-
-    if (ctx->internal->pool_internal && !ctx->pool)
-        ctx->pool = ctx->internal->pool_internal;
-
-    /* preallocate the frames in the pool, if requested */
-    if (ctx->initial_pool_size > 0) {
-        ret = hwframe_pool_prealloc(ref);
-        if (ret < 0)
-            goto fail;
-    }
-
-    return 0;
-fail:
-    if (ctx->internal->hw_type->frames_uninit)
-        ctx->internal->hw_type->frames_uninit(ctx);
-    return ret;
-}
-
-int av_hwframe_transfer_get_formats(AVBufferRef *hwframe_ref,
-                                    enum AVHWFrameTransferDirection dir,
-                                    enum AVPixelFormat **formats, int flags)
-{
-    AVHWFramesContext *ctx = (AVHWFramesContext*)hwframe_ref->data;
-
-    if (!ctx->internal->hw_type->transfer_get_formats)
-        return AVERROR(ENOSYS);
-
-    return ctx->internal->hw_type->transfer_get_formats(ctx, dir, formats);
-}
-
-static int transfer_data_alloc(AVFrame *dst, const AVFrame *src, int flags)
-{
-    AVHWFramesContext *ctx = (AVHWFramesContext*)src->hw_frames_ctx->data;
-    AVFrame *frame_tmp;
-    int ret = 0;
-
-    frame_tmp = av_frame_alloc();
-    if (!frame_tmp)
-        return AVERROR(ENOMEM);
-
-    /* if the format is set, use that
-     * otherwise pick the first supported one */
-    if (dst->format >= 0) {
-        frame_tmp->format = dst->format;
-    } else {
-        enum AVPixelFormat *formats;
-
-        ret = av_hwframe_transfer_get_formats(src->hw_frames_ctx,
-                                              AV_HWFRAME_TRANSFER_DIRECTION_FROM,
-                                              &formats, 0);
-        if (ret < 0)
-            goto fail;
-        frame_tmp->format = formats[0];
-        av_freep(&formats);
-    }
-    frame_tmp->width  = ctx->width;
-    frame_tmp->height = ctx->height;
-
-    ret = av_frame_get_buffer(frame_tmp, 32);
-    if (ret < 0)
-        goto fail;
-
-    ret = av_hwframe_transfer_data(frame_tmp, src, flags);
-    if (ret < 0)
-        goto fail;
-
-    frame_tmp->width  = src->width;
-    frame_tmp->height = src->height;
-
-    av_frame_move_ref(dst, frame_tmp);
-
-fail:
-    av_frame_free(&frame_tmp);
-    return ret;
-}
-
-int av_hwframe_transfer_data(AVFrame *dst, const AVFrame *src, int flags)
-{
-    AVHWFramesContext *ctx;
-    int ret;
-
-    if (!dst->buf[0])
-        return transfer_data_alloc(dst, src, flags);
-
-    if (src->hw_frames_ctx) {
-        ctx = (AVHWFramesContext*)src->hw_frames_ctx->data;
-
-        ret = ctx->internal->hw_type->transfer_data_from(ctx, dst, src);
-        if (ret < 0)
-            return ret;
-    } else if (dst->hw_frames_ctx) {
-        ctx = (AVHWFramesContext*)dst->hw_frames_ctx->data;
-
-        ret = ctx->internal->hw_type->transfer_data_to(ctx, dst, src);
-        if (ret < 0)
-            return ret;
-    } else
-        return AVERROR(ENOSYS);
-
-    return 0;
-}
-
-int av_hwframe_get_buffer(AVBufferRef *hwframe_ref, AVFrame *frame, int flags)
-{
-    AVHWFramesContext *ctx = (AVHWFramesContext*)hwframe_ref->data;
-    int ret;
-
-    if (ctx->internal->source_frames) {
-        // This is a derived frame context, so we allocate in the source
-        // and map the frame immediately.
-        AVFrame *src_frame;
-
-        frame->format = ctx->format;
-        frame->hw_frames_ctx = av_buffer_ref(hwframe_ref);
-        if (!frame->hw_frames_ctx)
-            return AVERROR(ENOMEM);
-
-        src_frame = av_frame_alloc();
-        if (!src_frame)
-            return AVERROR(ENOMEM);
-
-        ret = av_hwframe_get_buffer(ctx->internal->source_frames,
-                                    src_frame, 0);
-        if (ret < 0) {
-            av_frame_free(&src_frame);
-            return ret;
-        }
-
-        ret = av_hwframe_map(frame, src_frame,
-                             ctx->internal->source_allocation_map_flags);
-        if (ret) {
-            av_log(ctx, AV_LOG_ERROR, "Failed to map frame into derived "
-                   "frame context: %d.\n", ret);
-            av_frame_free(&src_frame);
-            return ret;
-        }
-
-        // Free the source frame immediately - the mapped frame still
-        // contains a reference to it.
-        av_frame_free(&src_frame);
-
-        return 0;
-    }
-
-    if (!ctx->internal->hw_type->frames_get_buffer)
-        return AVERROR(ENOSYS);
-
-    if (!ctx->pool)
-        return AVERROR(EINVAL);
-
-    frame->hw_frames_ctx = av_buffer_ref(hwframe_ref);
-    if (!frame->hw_frames_ctx)
-        return AVERROR(ENOMEM);
-
-    ret = ctx->internal->hw_type->frames_get_buffer(ctx, frame);
-    if (ret < 0) {
-        av_buffer_unref(&frame->hw_frames_ctx);
-        return ret;
-    }
-
-    return 0;
-}
-
-void *av_hwdevice_hwconfig_alloc(AVBufferRef *ref)
-{
-    AVHWDeviceContext *ctx = (AVHWDeviceContext*)ref->data;
-    const HWContextType  *hw_type = ctx->internal->hw_type;
-
-    if (hw_type->device_hwconfig_size == 0)
-        return NULL;
-
-    return av_mallocz(hw_type->device_hwconfig_size);
-}
-
-AVHWFramesConstraints *av_hwdevice_get_hwframe_constraints(AVBufferRef *ref,
-                                                           const void *hwconfig)
-{
-    AVHWDeviceContext *ctx = (AVHWDeviceContext*)ref->data;
-    const HWContextType  *hw_type = ctx->internal->hw_type;
-    AVHWFramesConstraints *constraints;
-
-    if (!hw_type->frames_get_constraints)
-        return NULL;
-
-    constraints = av_mallocz(sizeof(*constraints));
-    if (!constraints)
-        return NULL;
-
-    constraints->min_width = constraints->min_height = 0;
-    constraints->max_width = constraints->max_height = INT_MAX;
-
-    if (hw_type->frames_get_constraints(ctx, hwconfig, constraints) >= 0) {
-        return constraints;
-    } else {
-        av_hwframe_constraints_free(&constraints);
-        return NULL;
-    }
-}
-
-void av_hwframe_constraints_free(AVHWFramesConstraints **constraints)
-{
-    if (*constraints) {
-        av_freep(&(*constraints)->valid_hw_formats);
-        av_freep(&(*constraints)->valid_sw_formats);
-    }
-    av_freep(constraints);
-}
-
-int av_hwdevice_ctx_create(AVBufferRef **pdevice_ref, enum AVHWDeviceType type,
-                           const char *device, AVDictionary *opts, int flags)
-{
-    AVBufferRef *device_ref = NULL;
-    AVHWDeviceContext *device_ctx;
-    int ret = 0;
-
-    device_ref = av_hwdevice_ctx_alloc(type);
-    if (!device_ref) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
-    }
-    device_ctx = (AVHWDeviceContext*)device_ref->data;
-
-    if (!device_ctx->internal->hw_type->device_create) {
-        ret = AVERROR(ENOSYS);
-        goto fail;
-    }
-
-    ret = device_ctx->internal->hw_type->device_create(device_ctx, device,
-                                                       opts, flags);
-    if (ret < 0)
-        goto fail;
-
-    ret = av_hwdevice_ctx_init(device_ref);
-    if (ret < 0)
-        goto fail;
-
-    *pdevice_ref = device_ref;
-    return 0;
-fail:
-    av_buffer_unref(&device_ref);
-    *pdevice_ref = NULL;
-    return ret;
-}
-
-int av_hwdevice_ctx_create_derived(AVBufferRef **dst_ref_ptr,
-                                   enum AVHWDeviceType type,
-                                   AVBufferRef *src_ref, int flags)
-{
-    AVBufferRef *dst_ref = NULL, *tmp_ref;
-    AVHWDeviceContext *dst_ctx, *tmp_ctx;
-    int ret = 0;
-
-    tmp_ref = src_ref;
-    while (tmp_ref) {
-        tmp_ctx = (AVHWDeviceContext*)tmp_ref->data;
-        if (tmp_ctx->type == type) {
-            dst_ref = av_buffer_ref(tmp_ref);
-            if (!dst_ref) {
-                ret = AVERROR(ENOMEM);
-                goto fail;
-            }
-            goto done;
-        }
-        tmp_ref = tmp_ctx->internal->source_device;
-    }
-
-    dst_ref = av_hwdevice_ctx_alloc(type);
-    if (!dst_ref) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
-    }
-    dst_ctx = (AVHWDeviceContext*)dst_ref->data;
-
-    tmp_ref = src_ref;
-    while (tmp_ref) {
-        tmp_ctx = (AVHWDeviceContext*)tmp_ref->data;
-        if (dst_ctx->internal->hw_type->device_derive) {
-            ret = dst_ctx->internal->hw_type->device_derive(dst_ctx,
-                                                            tmp_ctx,
-                                                            flags);
-            if (ret == 0) {
-                dst_ctx->internal->source_device = av_buffer_ref(src_ref);
-                if (!dst_ctx->internal->source_device) {
-                    ret = AVERROR(ENOMEM);
-                    goto fail;
-                }
-                goto done;
-            }
-            if (ret != AVERROR(ENOSYS))
-                goto fail;
-        }
-        tmp_ref = tmp_ctx->internal->source_device;
-    }
-
-    ret = AVERROR(ENOSYS);
-    goto fail;
-
-done:
-    ret = av_hwdevice_ctx_init(dst_ref);
-    if (ret < 0)
-        goto fail;
-
-    *dst_ref_ptr = dst_ref;
-    return 0;
-
-fail:
-    av_buffer_unref(&dst_ref);
-    *dst_ref_ptr = NULL;
-    return ret;
-}
-
-static void ff_hwframe_unmap(void *opaque, uint8_t *data)
-{
-    HWMapDescriptor *hwmap = (HWMapDescriptor*)data;
-    AVHWFramesContext *ctx = opaque;
-
-    if (hwmap->unmap)
-        hwmap->unmap(ctx, hwmap);
-
-    av_frame_free(&hwmap->source);
-
-    av_buffer_unref(&hwmap->hw_frames_ctx);
-
-    av_free(hwmap);
-}
-
-int ff_hwframe_map_create(AVBufferRef *hwframe_ref,
-                          AVFrame *dst, const AVFrame *src,
-                          void (*unmap)(AVHWFramesContext *ctx,
-                                        HWMapDescriptor *hwmap),
-                          void *priv)
-{
-    AVHWFramesContext *ctx = (AVHWFramesContext*)hwframe_ref->data;
-    HWMapDescriptor *hwmap;
-    int ret;
-
-    hwmap = av_mallocz(sizeof(*hwmap));
-    if (!hwmap) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
-    }
-
-    hwmap->source = av_frame_alloc();
-    if (!hwmap->source) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
-    }
-    ret = av_frame_ref(hwmap->source, src);
-    if (ret < 0)
-        goto fail;
-
-    hwmap->hw_frames_ctx = av_buffer_ref(hwframe_ref);
-    if (!hwmap->hw_frames_ctx) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
-    }
-
-    hwmap->unmap = unmap;
-    hwmap->priv  = priv;
-
-    dst->buf[0] = av_buffer_create((uint8_t*)hwmap, sizeof(*hwmap),
-                                   &ff_hwframe_unmap, ctx, 0);
-    if (!dst->buf[0]) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
-    }
-
-    return 0;
-
-fail:
-    if (hwmap) {
-        av_buffer_unref(&hwmap->hw_frames_ctx);
-        av_frame_free(&hwmap->source);
-    }
-    av_free(hwmap);
-    return ret;
-}
-
-int av_hwframe_map(AVFrame *dst, const AVFrame *src, int flags)
-{
-    AVHWFramesContext *src_frames, *dst_frames;
-    HWMapDescriptor *hwmap;
-    int ret;
-
-    if (src->hw_frames_ctx && dst->hw_frames_ctx) {
-        src_frames = (AVHWFramesContext*)src->hw_frames_ctx->data;
-        dst_frames = (AVHWFramesContext*)dst->hw_frames_ctx->data;
-
-        if ((src_frames == dst_frames &&
-             src->format == dst_frames->sw_format &&
-             dst->format == dst_frames->format) ||
-            (src_frames->internal->source_frames &&
-             src_frames->internal->source_frames->data ==
-             (uint8_t*)dst_frames)) {
-            // This is an unmap operation.  We don't need to directly
-            // do anything here other than fill in the original frame,
-            // because the real unmap will be invoked when the last
-            // reference to the mapped frame disappears.
-            if (!src->buf[0]) {
-                av_log(src_frames, AV_LOG_ERROR, "Invalid mapping "
-                       "found when attempting unmap.\n");
-                return AVERROR(EINVAL);
-            }
-            hwmap = (HWMapDescriptor*)src->buf[0]->data;
-            av_frame_unref(dst);
-            return av_frame_ref(dst, hwmap->source);
-        }
-    }
-
-    if (src->hw_frames_ctx) {
-        src_frames = (AVHWFramesContext*)src->hw_frames_ctx->data;
-
-        if (src_frames->format == src->format &&
-            src_frames->internal->hw_type->map_from) {
-            ret = src_frames->internal->hw_type->map_from(src_frames,
-                                                          dst, src, flags);
-            if (ret != AVERROR(ENOSYS))
-                return ret;
-        }
-    }
-
-    if (dst->hw_frames_ctx) {
-        dst_frames = (AVHWFramesContext*)dst->hw_frames_ctx->data;
-
-        if (dst_frames->format == dst->format &&
-            dst_frames->internal->hw_type->map_to) {
-            ret = dst_frames->internal->hw_type->map_to(dst_frames,
-                                                        dst, src, flags);
-            if (ret != AVERROR(ENOSYS))
-                return ret;
-        }
-    }
-
-    return AVERROR(ENOSYS);
-}
-
-int av_hwframe_ctx_create_derived(AVBufferRef **derived_frame_ctx,
-                                  enum AVPixelFormat format,
-                                  AVBufferRef *derived_device_ctx,
-                                  AVBufferRef *source_frame_ctx,
-                                  int flags)
-{
-    AVBufferRef   *dst_ref = NULL;
-    AVHWFramesContext *dst = NULL;
-    AVHWFramesContext *src = (AVHWFramesContext*)source_frame_ctx->data;
-    int ret;
-
-    if (src->internal->source_frames) {
-        AVHWFramesContext *src_src =
-            (AVHWFramesContext*)src->internal->source_frames->data;
-        AVHWDeviceContext *dst_dev =
-            (AVHWDeviceContext*)derived_device_ctx->data;
-
-        if (src_src->device_ctx == dst_dev) {
-            // This is actually an unmapping, so we just return a
-            // reference to the source frame context.
-            *derived_frame_ctx =
-                av_buffer_ref(src->internal->source_frames);
-            if (!*derived_frame_ctx) {
-                ret = AVERROR(ENOMEM);
-                goto fail;
-            }
-            return 0;
-        }
-    }
-
-    dst_ref = av_hwframe_ctx_alloc(derived_device_ctx);
-    if (!dst_ref) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
-    }
-
-    dst = (AVHWFramesContext*)dst_ref->data;
-
-    dst->format    = format;
-    dst->sw_format = src->sw_format;
-    dst->width     = src->width;
-    dst->height    = src->height;
-
-    dst->internal->source_frames = av_buffer_ref(source_frame_ctx);
-    if (!dst->internal->source_frames) {
-        ret = AVERROR(ENOMEM);
-        goto fail;
-    }
-
-    dst->internal->source_allocation_map_flags =
-        flags & (AV_HWFRAME_MAP_READ      |
-                 AV_HWFRAME_MAP_WRITE     |
-                 AV_HWFRAME_MAP_OVERWRITE |
-                 AV_HWFRAME_MAP_DIRECT);
-
-    ret = AVERROR(ENOSYS);
-    if (src->internal->hw_type->frames_derive_from)
-        ret = src->internal->hw_type->frames_derive_from(dst, src, flags);
-    if (ret == AVERROR(ENOSYS) &&
-        dst->internal->hw_type->frames_derive_to)
-        ret = dst->internal->hw_type->frames_derive_to(dst, src, flags);
-    if (ret == AVERROR(ENOSYS))
-        ret = 0;
-    if (ret)
-        goto fail;
-
-    *derived_frame_ctx = dst_ref;
-    return 0;
-
-fail:
-    if (dst)
-        av_buffer_unref(&dst->internal->source_frames);
-    av_buffer_unref(&dst_ref);
-    return ret;
-}