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FFmpeg/libavutil/hwcontext.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_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)
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;
}