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lavf: make cmdutils's check_stream_specifier public.

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The new function is called avformat_match_stream_specifier()
and does not include logging the error message.
This commit is contained in:
Nicolas George
2012-07-18 11:41:13 +02:00
parent 3bd3e46c91
commit b0629366a2
5 changed files with 86 additions and 58 deletions
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61
libavformat/utils.c
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@ -4509,3 +4509,64 @@ AVRational av_guess_sample_aspect_ratio(AVFormatContext *format, AVStream *strea
else
return frame_sample_aspect_ratio;
}
int avformat_match_stream_specifier(AVFormatContext *s, AVStream *st,
const char *spec)
{
if (*spec <= '9' && *spec >= '0') /* opt:index */
return strtol(spec, NULL, 0) == st->index;
else if (*spec == 'v' || *spec == 'a' || *spec == 's' || *spec == 'd' ||
*spec == 't') { /* opt:[vasdt] */
enum AVMediaType type;
switch (*spec++) {
case 'v': type = AVMEDIA_TYPE_VIDEO; break;
case 'a': type = AVMEDIA_TYPE_AUDIO; break;
case 's': type = AVMEDIA_TYPE_SUBTITLE; break;
case 'd': type = AVMEDIA_TYPE_DATA; break;
case 't': type = AVMEDIA_TYPE_ATTACHMENT; break;
default: av_assert0(0);
}
if (type != st->codec->codec_type)
return 0;
if (*spec++ == ':') { /* possibly followed by :index */
int i, index = strtol(spec, NULL, 0);
for (i = 0; i < s->nb_streams; i++)
if (s->streams[i]->codec->codec_type == type && index-- == 0)
return i == st->index;
return 0;
}
return 1;
} else if (*spec == 'p' && *(spec + 1) == ':') {
int prog_id, i, j;
char *endptr;
spec += 2;
prog_id = strtol(spec, &endptr, 0);
for (i = 0; i < s->nb_programs; i++) {
if (s->programs[i]->id != prog_id)
continue;
if (*endptr++ == ':') {
int stream_idx = strtol(endptr, NULL, 0);
return stream_idx >= 0 &&
stream_idx < s->programs[i]->nb_stream_indexes &&
st->index == s->programs[i]->stream_index[stream_idx];
}
for (j = 0; j < s->programs[i]->nb_stream_indexes; j++)
if (st->index == s->programs[i]->stream_index[j])
return 1;
}
return 0;
} else if (*spec == '#') {
int sid;
char *endptr;
sid = strtol(spec + 1, &endptr, 0);
if (!*endptr)
return st->id == sid;
} else if (!*spec) /* empty specifier, matches everything */
return 1;
av_log(s, AV_LOG_ERROR, "Invalid stream specifier: %s.\n", spec);
return AVERROR(EINVAL);
}