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5cbeefc79e
FFmpeg/libavcodec/get_buffer.c
Mark Thompson 4743c9e87a lavc/get_buffer: Add a warning on failed allocation from a fixed pool 
For hardware cases where we are forced to have a fixed pool of frames
allocated up-front (such as array textures on decoder output), suggest
a possible workaround to the user if an allocation fails because the
pool is exhausted.
2024-03-25 20:44:30 +00:00

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/*
* The default get_buffer2() implementation
*
* 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 <stdint.h>
#include "libavutil/avassert.h"
#include "libavutil/avutil.h"
#include "libavutil/buffer.h"
#include "libavutil/frame.h"
#include "libavutil/hwcontext.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/samplefmt.h"
#include "libavutil/version.h"
#include "avcodec.h"
#include "internal.h"
#include "refstruct.h"
typedef struct FramePool {
/**
* Pools for each data plane. For audio all the planes have the same size,
* so only pools[0] is used.
*/
AVBufferPool *pools[4];
/*
* Pool parameters
*/
int format;
int width, height;
int stride_align[AV_NUM_DATA_POINTERS];
int linesize[4];
int planes;
int channels;
int samples;
} FramePool;
static void frame_pool_free(FFRefStructOpaque unused, void *obj)
{
FramePool *pool = obj;
int i;
for (i = 0; i < FF_ARRAY_ELEMS(pool->pools); i++)
av_buffer_pool_uninit(&pool->pools[i]);
}
static int update_frame_pool(AVCodecContext *avctx, AVFrame *frame)
{
FramePool *pool = avctx->internal->pool;
int i, ret, ch, planes;
if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
int planar = av_sample_fmt_is_planar(frame->format);
ch = frame->ch_layout.nb_channels;
planes = planar ? ch : 1;
}
if (pool && pool->format == frame->format) {
if (avctx->codec_type == AVMEDIA_TYPE_VIDEO &&
pool->width == frame->width && pool->height == frame->height)
return 0;
if (avctx->codec_type == AVMEDIA_TYPE_AUDIO && pool->planes == planes &&
pool->channels == ch && frame->nb_samples == pool->samples)
return 0;
}
pool = ff_refstruct_alloc_ext(sizeof(*pool), 0, NULL, frame_pool_free);
if (!pool)
return AVERROR(ENOMEM);
switch (avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO: {
int linesize[4];
int w = frame->width;
int h = frame->height;
int unaligned;
ptrdiff_t linesize1[4];
size_t size[4];
avcodec_align_dimensions2(avctx, &w, &h, pool->stride_align);
do {
// NOTE: do not align linesizes individually, this breaks e.g. assumptions
// that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
ret = av_image_fill_linesizes(linesize, avctx->pix_fmt, w);
if (ret < 0)
goto fail;
// increase alignment of w for next try (rhs gives the lowest bit set in w)
w += w & ~(w - 1);
unaligned = 0;
for (i = 0; i < 4; i++)
unaligned |= linesize[i] % pool->stride_align[i];
} while (unaligned);
for (i = 0; i < 4; i++)
linesize1[i] = linesize[i];
ret = av_image_fill_plane_sizes(size, avctx->pix_fmt, h, linesize1);
if (ret < 0)
goto fail;
for (i = 0; i < 4; i++) {
pool->linesize[i] = linesize[i];
if (size[i]) {
if (size[i] > INT_MAX - (16 + STRIDE_ALIGN - 1)) {
ret = AVERROR(EINVAL);
goto fail;
}
pool->pools[i] = av_buffer_pool_init(size[i] + 16 + STRIDE_ALIGN - 1,
CONFIG_MEMORY_POISONING ?
NULL :
av_buffer_allocz);
if (!pool->pools[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
}
pool->format = frame->format;
pool->width = frame->width;
pool->height = frame->height;
break;
}
case AVMEDIA_TYPE_AUDIO: {
ret = av_samples_get_buffer_size(&pool->linesize[0], ch,
frame->nb_samples, frame->format, 0);
if (ret < 0)
goto fail;
pool->pools[0] = av_buffer_pool_init(pool->linesize[0], NULL);
if (!pool->pools[0]) {
ret = AVERROR(ENOMEM);
goto fail;
}
pool->format = frame->format;
pool->planes = planes;
pool->channels = ch;
pool->samples = frame->nb_samples;
break;
}
default: av_assert0(0);
}
ff_refstruct_unref(&avctx->internal->pool);
avctx->internal->pool = pool;
return 0;
fail:
ff_refstruct_unref(&pool);
return ret;
}
static int audio_get_buffer(AVCodecContext *avctx, AVFrame *frame)
{
FramePool *pool = avctx->internal->pool;
int planes = pool->planes;
int i;
frame->linesize[0] = pool->linesize[0];
if (planes > AV_NUM_DATA_POINTERS) {
frame->extended_data = av_calloc(planes, sizeof(*frame->extended_data));
frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
frame->extended_buf = av_calloc(frame->nb_extended_buf,
sizeof(*frame->extended_buf));
if (!frame->extended_data || !frame->extended_buf) {
av_freep(&frame->extended_data);
av_freep(&frame->extended_buf);
return AVERROR(ENOMEM);
}
} else {
frame->extended_data = frame->data;
av_assert0(frame->nb_extended_buf == 0);
}
for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
frame->buf[i] = av_buffer_pool_get(pool->pools[0]);
if (!frame->buf[i])
goto fail;
frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
}
for (i = 0; i < frame->nb_extended_buf; i++) {
frame->extended_buf[i] = av_buffer_pool_get(pool->pools[0]);
if (!frame->extended_buf[i])
goto fail;
frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
}
if (avctx->debug & FF_DEBUG_BUFFERS)
av_log(avctx, AV_LOG_DEBUG, "default_get_buffer called on frame %p", frame);
return 0;
fail:
av_frame_unref(frame);
return AVERROR(ENOMEM);
}
static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
{
FramePool *pool = s->internal->pool;
int i;
if (pic->data[0] || pic->data[1] || pic->data[2] || pic->data[3]) {
av_log(s, AV_LOG_ERROR, "pic->data[*]!=NULL in avcodec_default_get_buffer\n");
return -1;
}
memset(pic->data, 0, sizeof(pic->data));
pic->extended_data = pic->data;
for (i = 0; i < 4 && pool->pools[i]; i++) {
pic->linesize[i] = pool->linesize[i];
pic->buf[i] = av_buffer_pool_get(pool->pools[i]);
if (!pic->buf[i])
goto fail;
pic->data[i] = pic->buf[i]->data;
}
for (; i < AV_NUM_DATA_POINTERS; i++) {
pic->data[i] = NULL;
pic->linesize[i] = 0;
}
if (s->debug & FF_DEBUG_BUFFERS)
av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p\n", pic);
return 0;
fail:
av_frame_unref(pic);
return AVERROR(ENOMEM);
}
int avcodec_default_get_buffer2(AVCodecContext *avctx, AVFrame *frame, int flags)
{
int ret;
if (avctx->hw_frames_ctx) {
ret = av_hwframe_get_buffer(avctx->hw_frames_ctx, frame, 0);
if (ret == AVERROR(ENOMEM)) {
AVHWFramesContext *frames_ctx =
(AVHWFramesContext*)avctx->hw_frames_ctx->data;
if (frames_ctx->initial_pool_size > 0 &&
!avctx->internal->warned_on_failed_allocation_from_fixed_pool) {
av_log(avctx, AV_LOG_WARNING, "Failed to allocate a %s/%s "
"frame from a fixed pool of hardware frames.\n",
av_get_pix_fmt_name(frames_ctx->format),
av_get_pix_fmt_name(frames_ctx->sw_format));
av_log(avctx, AV_LOG_WARNING, "Consider setting "
"extra_hw_frames to a larger value "
"(currently set to %d, giving a pool size of %d).\n",
avctx->extra_hw_frames, frames_ctx->initial_pool_size);
avctx->internal->warned_on_failed_allocation_from_fixed_pool = 1;
}
}
frame->width = avctx->coded_width;
frame->height = avctx->coded_height;
return ret;
}
if ((ret = update_frame_pool(avctx, frame)) < 0)
return ret;
switch (avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
return video_get_buffer(avctx, frame);
case AVMEDIA_TYPE_AUDIO:
return audio_get_buffer(avctx, frame);
default:
return -1;
}
}
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