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lavf/gsmdec: Add raw gsm autodetection.

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Fixes bug 555.
This commit is contained in:
Carl Eugen Hoyos 2016-04-09 11:38:46 +02:00
parent d433623fba
commit 56cb465b38
1 changed files with 18 additions and 0 deletions
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18
libavformat/gsmdec.c
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@ -34,6 +34,23 @@ typedef struct GSMDemuxerContext {
int sample_rate;
} GSMDemuxerContext;
static int gsm_probe(AVProbeData *p)
{
int valid = 0, invalid = 0;
uint8_t *b = p->buf;
while (b < p->buf + p->buf_size - 32) {
if ((*b & 0xf0) == 0xd0) {
valid++;
} else {
invalid++;
}
b += 33;
}
if (valid >> 5 > invalid)
return AVPROBE_SCORE_EXTENSION + 1;
return 0;
}
static int gsm_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size;
@ -91,6 +108,7 @@ AVInputFormat ff_gsm_demuxer = {
.name = "gsm",
.long_name = NULL_IF_CONFIG_SMALL("raw GSM"),
.priv_data_size = sizeof(GSMDemuxerContext),
.read_probe = gsm_probe,
.read_header = gsm_read_header,
.read_packet = gsm_read_packet,
.flags = AVFMT_GENERIC_INDEX,