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avformat/assenc: support remuxing old V4 ASS form (SSA)

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This commit is contained in:
Clément Bœsch 2014-10-11 12:57:37 +02:00
parent b243393e8b
commit bf700a995d
1 changed files with 9 additions and 2 deletions
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11
libavformat/assenc.c
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@ -35,6 +35,7 @@ typedef struct ASSContext{
DialogueLine *dialogue_cache;
DialogueLine *last_added_dialogue;
int cache_size;
int ssa_mode;
}ASSContext;
static int write_header(AVFormatContext *s)
@ -53,8 +54,10 @@ static int write_header(AVFormatContext *s)
avio_write(s->pb, avctx->extradata, avctx->extradata_size);
if (avctx->extradata[avctx->extradata_size - 1] != '\n')
avio_write(s->pb, "\r\n", 2);
ass->ssa_mode = !strstr(avctx->extradata, "\n[V4+ Styles]");
if (!strstr(avctx->extradata, "\n[Events]"))
avio_printf(s->pb, "[Events]\r\nFormat: Layer, Start, End, Style, Actor, MarginL, MarginR, MarginV, Effect, Text\r\n");
avio_printf(s->pb, "[Events]\r\nFormat: %s, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n",
ass->ssa_mode ? "Marked" : "Layer");
}
avio_flush(s->pb);
@ -154,6 +157,9 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
if (*p == ',')
p++;
if (ass->ssa_mode && !strncmp(p, "Marked=", 7))
p += 7;
layer = strtol(p, &p, 10);
if (*p == ',')
p++;
@ -164,7 +170,8 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
if (hh1 > 9) hh1 = 9, mm1 = 59, ss1 = 59, ms1 = 99;
if (hh2 > 9) hh2 = 9, mm2 = 59, ss2 = 59, ms2 = 99;
dialogue->line = av_asprintf("%ld,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s",
dialogue->line = av_asprintf("%s%ld,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s",
ass->ssa_mode ? "Marked=" : "",
layer, hh1, mm1, ss1, ms1, hh2, mm2, ss2, ms2, p);
if (!dialogue->line) {
av_free(dialogue);