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FFmpeg/libavutil/hwcontext.c
wm4 3303511f33 lavu: add new D3D11 pixfmt and hwcontext 
To be used with the new d3d11 hwaccel decode API.

With the new hwaccel API, we don't want surfaces to depend on the
decoder (other than the required dimension and format). The old D3D11VA
pixfmt uses ID3D11VideoDecoderOutputView pointers, which include the
decoder configuration, and thus is incompatible with the new hwaccel
API. This patch introduces AV_PIX_FMT_D3D11, which uses ID3D11Texture2D
and an index. It's simpler and compatible with the new hwaccel API.

The introduced hwcontext supports only the new pixfmt.

Frame upload code untested.

Significantly based on work by Steve Lhomme <robux4@gmail.com>, but with
heavy changes/rewrites.

Merges Libav commit fff90422d1.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
2017-06-27 18:05:02 +02:00

858 lines
24 KiB
C
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/*
* 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_DXVA2
&ff_hwcontext_type_dxva2,
#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
NULL,
};
static const char *const hw_type_names[] = {
[AV_HWDEVICE_TYPE_CUDA] = "cuda",
[AV_HWDEVICE_TYPE_DXVA2] = "dxva2",
[AV_HWDEVICE_TYPE_D3D11VA] = "d3d11va",
[AV_HWDEVICE_TYPE_QSV] = "qsv",
[AV_HWDEVICE_TYPE_VAAPI] = "vaapi",
[AV_HWDEVICE_TYPE_VDPAU] = "vdpau",
[AV_HWDEVICE_TYPE_VIDEOTOOLBOX] = "videotoolbox",
};
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 >= 0 && 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->source_frames) {
av_buffer_unref(&ctx->internal->source_frames);
} else {
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->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)
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:
*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;
}
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