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avformat/utils: Stream specifier enhancement 2.

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In some cases, mainly working with multiprogram mpeg-ts containers as
input, it would be handy to select sub stream of a specific program by
their metadata.
This patch makes it possible to narrow the stream selection among
streams of the specified program by stream metadata.

Examples:
p:601:m:language:hun  will select all sub streams of program with id 601
where sub streams have metadata key named 'language' with value 'hun'.
p:602:m:guide  will select all sub streams of program with id 602 where
sub streams have metadata key named 'guide'.

Signed-off-by: Bela Bodecs <bodecsb@vivanet.hu>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Bela Bodecs 2018-04-13 12:11:32 +02:00 committed by Michael Niedermayer
parent 6b28e551d0
commit 3e1204b94d
2 changed files with 36 additions and 2 deletions
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10
doc/fftools-common-opts.texi
View File

@ -42,14 +42,20 @@ streams, 'V' only matches video streams which are not attached pictures, video
thumbnails or cover arts. If @var{stream_index} is given, then it matches
stream number @var{stream_index} of this type. Otherwise, it matches all
streams of this type.
@item p:@var{program_id}[:@var{stream_index}] or p:@var{program_id}[:@var{stream_type}[:@var{stream_index}]]
@item p:@var{program_id}[:@var{stream_index}] or p:@var{program_id}[:@var{stream_type}[:@var{stream_index}]] or
p:@var{program_id}:m:@var{key}[:@var{value}]
In first version, if @var{stream_index} is given, then it matches the stream with number @var{stream_index}
in the program with the id @var{program_id}. Otherwise, it matches all streams in the
program. In the latter version, @var{stream_type} is one of following: 'v' for video, 'a' for audio, 's'
program. In the second version, @var{stream_type} is one of following: 'v' for video, 'a' for audio, 's'
for subtitle, 'd' for data. If @var{stream_index} is also given, then it matches
stream number @var{stream_index} of this type in the program with the id @var{program_id}.
Otherwise, if only @var{stream_type} is given, it matches all
streams of this type in the program with the id @var{program_id}.
In the third version matches streams in the program with the id @var{program_id} with the metadata
tag @var{key} having the specified value. If
@var{value} is not given, matches streams that contain the given tag with any
value.
@item #@var{stream_id} or i:@var{stream_id}
Match the stream by stream id (e.g. PID in MPEG-TS container).
@item m:@var{key}[:@var{value}]

28
libavformat/utils.c
View File

@ -5124,6 +5124,34 @@ FF_ENABLE_DEPRECATION_WARNINGS
}
return 0;
}
} else if ( *endptr == 'm') { // p:<id>:m:<metadata_spec>
AVDictionaryEntry *tag;
char *key, *val;
int ret = 0;
if (*(++endptr) != ':') {
av_log(s, AV_LOG_ERROR, "Invalid stream specifier syntax, missing ':' sign after :m.\n");
return AVERROR(EINVAL);
}
val = strchr(++endptr, ':');
key = val ? av_strndup(endptr, val - endptr) : av_strdup(endptr);
if (!key)
return AVERROR(ENOMEM);
for (j = 0; j < s->programs[i]->nb_stream_indexes; j++)
if (st->index == s->programs[i]->stream_index[j]) {
tag = av_dict_get(st->metadata, key, NULL, 0);
if (tag && (!val || !strcmp(tag->value, val + 1)))
ret = 1;
break;
}
av_freep(&key);
return ret;
} else { // p:<id>:<index>
int stream_idx = strtol(endptr, NULL, 0);
return stream_idx >= 0 &&