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avformat/mpegts: add option max_packet_size 

Makes maximum size of emitted packet user-tunable.

Default is existing 204800 bytes.
This commit is contained in:
Gyan Doshi 2022-01-12 20:39:59 +05:30
parent b1ef5882e3
commit bca30570d2
2 changed files with 10 additions and 5 deletions
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4
doc/demuxers.texi
View File

@ -775,6 +775,10 @@ disabled). Default value is -1.
@item merge_pmt_versions
Re-use existing streams when a PMT's version is updated and elementary
streams move to different PIDs. Default value is 0.
@item max_packet_size
Set maximum size, in bytes, of packet emitted by the demuxer. Payloads above this size
are split across multiple packets. Range is 1 to INT_MAX/2. Default is 204800 bytes.
@end table
@section mpjpeg

11
libavformat/mpegts.c
View File

@ -47,8 +47,6 @@
* synchronization is lost */
#define MAX_RESYNC_SIZE 65536
#define MAX_PES_PAYLOAD 200 * 1024
#define MAX_MP4_DESCR_COUNT 16
#define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
@ -162,6 +160,7 @@ struct MpegTSContext {
int resync_size;
int merge_pmt_versions;
int max_packet_size;
/******************************************/
/* private mpegts data */
@ -198,6 +197,8 @@ static const AVOption options[] = {
{.i64 = 0}, 0, 1, 0 },
{"skip_clear", "skip clearing programs", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_BOOL,
{.i64 = 0}, 0, 1, 0 },
{"max_packet_size", "maximum size of emitted packet", offsetof(MpegTSContext, max_packet_size), AV_OPT_TYPE_INT,
{.i64 = 204800}, 1, INT_MAX/2, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
@ -1121,7 +1122,7 @@ static AVBufferRef *buffer_pool_get(MpegTSContext *ts, int size)
{
int index = av_log2(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!ts->pools[index]) {
int pool_size = FFMIN(MAX_PES_PAYLOAD + AV_INPUT_BUFFER_PADDING_SIZE, 2 << index);
int pool_size = FFMIN(ts->max_packet_size + AV_INPUT_BUFFER_PADDING_SIZE, 2 << index);
ts->pools[index] = av_buffer_pool_init(pool_size, NULL);
if (!ts->pools[index])
return NULL;
@ -1368,7 +1369,7 @@ skip:
break;
case MPEGTS_PAYLOAD:
do {
int max_packet_size = MAX_PES_PAYLOAD;
int max_packet_size = ts->max_packet_size;
if (pes->PES_packet_length && pes->PES_packet_length + PES_START_SIZE > pes->pes_header_size)
max_packet_size = pes->PES_packet_length + PES_START_SIZE - pes->pes_header_size;
@ -1378,7 +1379,7 @@ skip:
if (ret < 0)
return ret;
pes->PES_packet_length = 0;
max_packet_size = MAX_PES_PAYLOAD;
max_packet_size = ts->max_packet_size;
ts->stop_parse = 1;
} else if (pes->data_index == 0 &&
buf_size > max_packet_size) {