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sub: use new FFmpeg API to check MicroDVD FPS

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Before this, it wasn't possible to distinguish MicroDVD subtitles
without FPS header, and subtitles with FPS header equal to FFmpeg's
fallback FPS.
This commit is contained in:
wm4 2014-03-04 00:28:10 +01:00
parent 43e997ca07
commit 5606cf2948
4 changed files with 21 additions and 10 deletions
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18
demux/demux_lavf.c
View File

@ -461,11 +461,19 @@ static void handle_stream(demuxer_t *demuxer, int i)
sh_sub->w = codec->width;
sh_sub->h = codec->height;
// Hack for MicroDVD: if time_base matches the ffmpeg microdvd reader's
// default FPS (23.976), assume the MicroDVD file did not declare a
// FPS, and the MicroDVD file uses frame based timing.
if (codec->time_base.num == 125 && codec->time_base.den == 2997)
sh_sub->frame_based = true;
if (matches_avinputformat_name(priv, "microdvd")) {
AVRational r;
if (av_opt_get_q(avfc, "subfps", AV_OPT_SEARCH_CHILDREN, &r) >= 0) {
// File headers don't have a FPS set.
if (r.num < 1 || r.den < 1)
sh_sub->frame_based = av_q2d(av_inv_q(codec->time_base));
} else {
// Older libavcodec versions. If the FPS matches the microdvd
// reader's default, assume it uses frame based timing.
if (codec->time_base.num == 125 && codec->time_base.den == 2997)
sh_sub->frame_based = 23.976;
}
}
break;
}
case AVMEDIA_TYPE_ATTACHMENT: {

2
demux/demux_subreader.c
View File

@ -1361,7 +1361,7 @@ static int d_open_file(struct demuxer *demuxer, enum demux_check check)
p->sh = new_sh_stream(demuxer, STREAM_SUB);
p->sh->codec = sd->codec;
p->sh->sub->frame_based = !sd->sub_uses_time;
p->sh->sub->frame_based = sd->sub_uses_time ? 0 : 23.976;
p->sh->sub->is_utf8 = sr.args.utf16 != 0; // converted from utf-16 -> utf-8
add_sub_data(demuxer, sd);

3
demux/stheader.h
View File

@ -88,7 +88,8 @@ typedef struct sh_sub {
unsigned char *extradata; // extra header data passed from demuxer
int extradata_len;
int w, h; // mp4 vobsubs
int frame_based; // timestamps are frame-based
double frame_based; // timestamps are frame-based (and this is the
// fallback framerate used for timestamps)
bool is_utf8; // if false, subtitle packet charset is unknown
struct ass_track *track; // loaded by libass
struct dec_sub *dec_sub; // decoder context

8
sub/dec_sub.c
View File

@ -464,9 +464,11 @@ bool sub_read_all_packets(struct dec_sub *sub, struct sh_stream *sh)
double sub_speed = 1.0;
// 23.976 FPS is used as default timebase for frame based formats
if (sub->video_fps && sh->sub->frame_based)
sub_speed *= 23.976 / sub->video_fps;
if (sub->video_fps && sh->sub->frame_based > 0) {
MP_VERBOSE(sub, "Frame based format, dummy FPS: %f, video FPS: %f\n",
sh->sub->frame_based, sub->video_fps);
sub_speed *= sh->sub->frame_based / sub->video_fps;
}
if (opts->sub_fps && sub->video_fps)
sub_speed *= opts->sub_fps / sub->video_fps;