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mpegts: fuzzy crc check for not so spec compliant files 

Fixes Ticket598

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-10-08 05:25:27 +02:00
parent 43bbc3f477
commit f464b02d22
1 changed files with 14 additions and 3 deletions
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17
libavformat/mpegts.c
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@ -123,6 +123,7 @@ struct MpegTSContext {
unsigned int nb_prg;
struct Program *prg;
int8_t crc_validity[NB_PID_MAX];
/** filters for various streams specified by PMT + for the PAT and PMT */
MpegTSFilter *pids[NB_PID_MAX];
@ -277,6 +278,7 @@ static int discard_pid(MpegTSContext *ts, unsigned int pid)
static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
const uint8_t *buf, int buf_size, int is_start)
{
MpegTSContext *ts = s->priv_data;
MpegTSSectionFilter *tss = &tss1->u.section_filter;
int len;
@ -304,10 +306,19 @@ static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
}
if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
int crc_valid = 1;
tss->end_of_section_reached = 1;
if (!tss->check_crc ||
av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
tss->section_buf, tss->section_h_size) == 0)
if (tss->check_crc){
crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
if (crc_valid){
ts->crc_validity[ tss1->pid ] = 100;
}else if(ts->crc_validity[ tss1->pid ] > -10){
ts->crc_validity[ tss1->pid ]--;
}else
crc_valid = 2;
}
if (crc_valid)
tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
}
}