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avcodec/mpegpicture: Store linesize in ScratchpadContext 

The mpegvideo-based codecs currently require the linesize to be
constant (except when the frame dimensions change); one reason
for this is that certain scratch buffers whose size depend on
linesize are only allocated once and are presumed to be correctly
sized if the pointers are != NULL.

This commit changes this by storing the actual linesize these
buffers belong to and reallocating the buffers if it does not
suffice. This is not enough to actually support changing linesizes,
but it is a start. And it is a prerequisite for the next patch.

Also don't emit an error message in case the source ctx's
edge_emu_buffer is unset in ff_mpeg_update_thread_context().
It need not be an error at all; e.g. it is a perfectly normal
state in case a hardware acceleration is used as the scratch
buffers are not allocated in this case (it is easy to run into
this issue with MPEG-4) or if the src context was not initialized
at all (e.g. because the first packet contained garbage).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-04-20 04:10:33 +02:00
parent 0aaabe1fd7
commit d4b63885a6
4 changed files with 29 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
libavcodec/mpegpicture.c
View File

@ -89,12 +89,16 @@ int ff_mpeg_framesize_alloc(AVCodecContext *avctx, MotionEstContext *me,
ScratchpadContext *sc, int linesize)
{
# define EMU_EDGE_HEIGHT (4 * 70)
int alloc_size = FFALIGN(FFABS(linesize) + 64, 32);
int linesizeabs = FFABS(linesize);
int alloc_size = FFALIGN(linesizeabs + 64, 32);
if (linesizeabs <= sc->linesize)
return 0;
if (avctx->hwaccel)
return 0;
if (linesize < 24) {
if (linesizeabs < 24) {
av_log(avctx, AV_LOG_ERROR, "Image too small, temporary buffers cannot function\n");
return AVERROR_PATCHWELCOME;
}
@ -102,6 +106,9 @@ int ff_mpeg_framesize_alloc(AVCodecContext *avctx, MotionEstContext *me,
if (av_image_check_size2(alloc_size, EMU_EDGE_HEIGHT, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0)
return AVERROR(ENOMEM);
av_freep(&sc->edge_emu_buffer);
av_freep(&me->scratchpad);
// edge emu needs blocksize + filter length - 1
// (= 17x17 for halfpel / 21x21 for H.264)
// VC-1 computes luma and chroma simultaneously and needs 19X19 + 9x9
@ -110,9 +117,11 @@ int ff_mpeg_framesize_alloc(AVCodecContext *avctx, MotionEstContext *me,
// we also use this buffer for encoding in encode_mb_internal() needig an additional 32 lines
if (!FF_ALLOCZ_TYPED_ARRAY(sc->edge_emu_buffer, alloc_size * EMU_EDGE_HEIGHT) ||
!FF_ALLOCZ_TYPED_ARRAY(me->scratchpad, alloc_size * 4 * 16 * 2)) {
sc->linesize = 0;
av_freep(&sc->edge_emu_buffer);
return AVERROR(ENOMEM);
}
sc->linesize = linesizeabs;
me->temp = me->scratchpad;
sc->rd_scratchpad = me->scratchpad;
@ -149,9 +158,9 @@ static int handle_pic_linesizes(AVCodecContext *avctx, Picture *pic,
return -1;
}
if (!sc->edge_emu_buffer &&
(ret = ff_mpeg_framesize_alloc(avctx, me, sc,
pic->f->linesize[0])) < 0) {
ret = ff_mpeg_framesize_alloc(avctx, me, sc,
pic->f->linesize[0]);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"get_buffer() failed to allocate context scratch buffers.\n");
ff_mpeg_unref_picture(pic);

1
libavcodec/mpegpicture.h
View File

@ -38,6 +38,7 @@ typedef struct ScratchpadContext {
uint8_t *rd_scratchpad; ///< scratchpad for rate distortion mb decision
uint8_t *obmc_scratchpad;
uint8_t *b_scratchpad; ///< scratchpad used for writing into write only buffers
int linesize; ///< linesize that the buffers in this context have been allocated for
} ScratchpadContext;
/**

19
libavcodec/mpegvideo.c
View File

@ -443,6 +443,7 @@ static void free_duplicate_context(MpegEncContext *s)
s->sc.rd_scratchpad =
s->sc.b_scratchpad =
s->sc.obmc_scratchpad = NULL;
s->sc.linesize = 0;
av_freep(&s->dct_error_sum);
av_freep(&s->me.map);
@ -464,12 +465,9 @@ static void free_duplicate_contexts(MpegEncContext *s)
static void backup_duplicate_context(MpegEncContext *bak, MpegEncContext *src)
{
#define COPY(a) bak->a = src->a
COPY(sc.edge_emu_buffer);
COPY(sc);
COPY(me.scratchpad);
COPY(me.temp);
COPY(sc.rd_scratchpad);
COPY(sc.b_scratchpad);
COPY(sc.obmc_scratchpad);
COPY(me.map);
COPY(me.score_map);
COPY(blocks);
@ -503,9 +501,9 @@ int ff_update_duplicate_context(MpegEncContext *dst, const MpegEncContext *src)
// exchange uv
FFSWAP(void *, dst->pblocks[4], dst->pblocks[5]);
}
if (!dst->sc.edge_emu_buffer &&
(ret = ff_mpeg_framesize_alloc(dst->avctx, &dst->me,
&dst->sc, dst->linesize)) < 0) {
ret = ff_mpeg_framesize_alloc(dst->avctx, &dst->me,
&dst->sc, dst->linesize);
if (ret < 0) {
av_log(dst->avctx, AV_LOG_ERROR, "failed to allocate context "
"scratch buffers.\n");
return ret;
@ -646,12 +644,9 @@ static void clear_context(MpegEncContext *s)
s->ac_val[0] =
s->ac_val[1] =
s->ac_val[2] =NULL;
s->sc.edge_emu_buffer = NULL;
s->me.scratchpad = NULL;
s->me.temp =
s->sc.rd_scratchpad =
s->sc.b_scratchpad =
s->sc.obmc_scratchpad = NULL;
s->me.temp = NULL;
memset(&s->sc, 0, sizeof(s->sc));
s->bitstream_buffer = NULL;

19
libavcodec/mpegvideo_dec.c
View File

@ -167,18 +167,13 @@ do {\
}
// linesize-dependent scratch buffer allocation
if (!s->sc.edge_emu_buffer)
if (s1->linesize) {
if (ff_mpeg_framesize_alloc(s->avctx, &s->me,
&s->sc, s1->linesize) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Failed to allocate context "
"scratch buffers.\n");
return AVERROR(ENOMEM);
}
} else {
av_log(s->avctx, AV_LOG_ERROR, "Context scratch buffers could not "
"be allocated due to unknown size.\n");
}
ret = ff_mpeg_framesize_alloc(s->avctx, &s->me,
&s->sc, s1->linesize);
if (ret < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Failed to allocate context "
"scratch buffers.\n");
return ret;
}
// MPEG-2/interlacing info
memcpy(&s->progressive_sequence, &s1->progressive_sequence,