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authortrav90 <travawine@protonmail.ch>2018-10-01 10:27:24 -0500
committertrav90 <travawine@protonmail.ch>2018-10-01 10:27:24 -0500
commitebc8d7e3ca8723d815904e6fee6c088c659d6784 (patch)
tree9e3115f44e9a09b9c71d40d72c7d5c939b2278e2 /media/ffvpx/libavutil/hwcontext.c
parent8e8fcee4a55de171303ebe526d3cf051522111bf (diff)
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[ffvpx] Update ffvp9/ffvp8 to release 4.0.2
Diffstat (limited to 'media/ffvpx/libavutil/hwcontext.c')
-rw-r--r--media/ffvpx/libavutil/hwcontext.c873
1 files changed, 873 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/hwcontext.c b/media/ffvpx/libavutil/hwcontext.c
new file mode 100644
index 000000000..70c556eca
--- /dev/null
+++ b/media/ffvpx/libavutil/hwcontext.c
@@ -0,0 +1,873 @@
+/*
+ * 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;
+}