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lavfi/subtitles: introduce stream_index 

Signed-off-by: ValdikSS <iam@valdikss.org.ru>
This commit is contained in:
ValdikSS 2014-05-01 14:51:17 +04:00 committed by Clément Bœsch
parent 91736025b2
commit 7a0e689c45
2 changed files with 35 additions and 2 deletions
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13
doc/filters.texi
View File

@ -7725,6 +7725,9 @@ changed.
@item charenc
Set subtitles input character encoding. @code{subtitles} filter only. Only
useful if not UTF-8.
@item stream_index, si
Set subtitles stream index. @code{subtitles} filter only.
@end table
If the first key is not specified, it is assumed that the first value
@ -7741,6 +7744,16 @@ which is equivalent to:
subtitles=filename=sub.srt
@end example
To render the default subtitles stream from file @file{video.mkv}, use:
@example
subtitles=video.mkv
@end example
To render the second subtitles stream from that file, use:
@example
subtitles=video.mkv:si=1
@end example
@section super2xsai
Scale the input by 2x and smooth using the Super2xSaI (Scale and

24
libavfilter/vf_subtitles.c
View File

@ -51,6 +51,7 @@ typedef struct {
ASS_Track *track;
char *filename;
char *charenc;
int stream_index;
uint8_t rgba_map[4];
int pix_step[4]; ///< steps per pixel for each plane of the main output
int original_w, original_h;
@ -247,7 +248,9 @@ AVFilter ff_vf_ass = {
static const AVOption subtitles_options[] = {
COMMON_OPTIONS
{"charenc", "set input character encoding", OFFSET(charenc), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
{"charenc", "set input character encoding", OFFSET(charenc), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
{"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
{"si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
{NULL},
};
@ -279,6 +282,7 @@ AVFILTER_DEFINE_CLASS(subtitles);
static av_cold int init_subtitles(AVFilterContext *ctx)
{
int j, ret, sid;
int k = 0;
AVDictionary *codec_opts = NULL;
AVFormatContext *fmt = NULL;
AVCodecContext *dec_ctx = NULL;
@ -309,7 +313,23 @@ static av_cold int init_subtitles(AVFilterContext *ctx)
goto end;
/* Locate subtitles stream */
ret = av_find_best_stream(fmt, AVMEDIA_TYPE_SUBTITLE, -1, -1, NULL, 0);
if (ass->stream_index < 0)
ret = av_find_best_stream(fmt, AVMEDIA_TYPE_SUBTITLE, -1, -1, NULL, 0);
else {
ret = -1;
if (ass->stream_index < fmt->nb_streams) {
for (j = 0; j < fmt->nb_streams; j++) {
if (fmt->streams[j]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
if (ass->stream_index == k) {
ret = j;
break;
}
k++;
}
}
}
}
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Unable to locate subtitle stream in %s\n",
ass->filename);