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ffmpeg/libavcodec/get_buffer.c

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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"
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(void *opaque, uint8_t *data)
{
FramePool *pool = (FramePool*)data;
int i;
for (i = 0; i < FF_ARRAY_ELEMS(pool->pools); i++)
av_buffer_pool_uninit(&pool->pools[i]);
av_freep(&data);
}
static AVBufferRef *frame_pool_alloc(void)
{
FramePool *pool = av_mallocz(sizeof(*pool));
AVBufferRef *buf;
if (!pool)
return NULL;
buf = av_buffer_create((uint8_t*)pool, sizeof(*pool),
frame_pool_free, NULL, 0);
if (!buf) {
av_freep(&pool);
return NULL;
}
return buf;
}
static int update_frame_pool(AVCodecContext *avctx, AVFrame *frame)
{
FramePool *pool = avctx->internal->pool ?
(FramePool*)avctx->internal->pool->data : NULL;
AVBufferRef *pool_buf;
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;
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
if (!ch)
ch = frame->channels;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
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_buf = frame_pool_alloc();
if (!pool_buf)
return AVERROR(ENOMEM);
pool = (FramePool*)pool_buf->data;
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);
}
av_buffer_unref(&avctx->internal->pool);
avctx->internal->pool = pool_buf;
return 0;
fail:
av_buffer_unref(&pool_buf);
return ret;
}
static int audio_get_buffer(AVCodecContext *avctx, AVFrame *frame)
{
FramePool *pool = (FramePool*)avctx->internal->pool->data;
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 = (FramePool*)s->internal->pool->data;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
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;
}
if (!desc) {
av_log(s, AV_LOG_ERROR,
"Unable to get pixel format descriptor for format %s\n",
av_get_pix_fmt_name(pic->format));
return AVERROR(EINVAL);
}
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);
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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