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fftools/ffmpeg: Take type limitations of AVFifo API into account 

The types used by the AVFifo API are inconsistent:
av_fifo_(space|size)() returns an int; av_fifo_alloc() takes an
unsigned, other parts use size_t. This commit therefore ensures
that the size of the muxing_queue FIFO never exceeds INT_MAX.

While just at it, also make sure not to call av_fifo_size()
unnecessarily often.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-11-20 12:14:55 +01:00
parent 71204e8e3d
commit 81be19b906
2 changed files with 5 additions and 5 deletions
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9
fftools/ffmpeg.c
View File

@ -753,14 +753,13 @@ static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int u
AVPacket *tmp_pkt;
/* the muxer is not initialized yet, buffer the packet */
if (!av_fifo_space(ost->muxing_queue)) {
size_t cur_size = av_fifo_size(ost->muxing_queue);
unsigned int are_we_over_size =
(ost->muxing_queue_data_size + pkt->size) > ost->muxing_queue_data_threshold;
int new_size = are_we_over_size ?
FFMIN(2 * av_fifo_size(ost->muxing_queue),
ost->max_muxing_queue_size) :
2 * av_fifo_size(ost->muxing_queue);
size_t limit = are_we_over_size ? ost->max_muxing_queue_size : INT_MAX;
size_t new_size = FFMIN(2 * cur_size, limit);
if (new_size <= av_fifo_size(ost->muxing_queue)) {
if (new_size <= cur_size) {
av_log(NULL, AV_LOG_ERROR,
"Too many packets buffered for output stream %d:%d.\n",
ost->file_index, ost->st->index);

1
fftools/ffmpeg_opt.c
View File

@ -1613,6 +1613,7 @@ static OutputStream *new_output_stream(OptionsContext *o, AVFormatContext *oc, e
ost->max_muxing_queue_size = 128;
MATCH_PER_STREAM_OPT(max_muxing_queue_size, i, ost->max_muxing_queue_size, oc, st);
ost->max_muxing_queue_size = FFMIN(ost->max_muxing_queue_size, INT_MAX / sizeof(ost->pkt));
ost->max_muxing_queue_size *= sizeof(ost->pkt);
ost->muxing_queue_data_size = 0;