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avformat/assdec: output ASS packets

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After this the order from the original file is stored through readorder
when doing ffmpeg -i input.ass -c copy output.mkv.

And now that the ASS muxer honors the ReadOrder, extracting the ass back
(without transcoding) restores the original order.
This commit is contained in:
Clément Bœsch 2014-09-14 09:35:10 +02:00
parent e58fc44649
commit ff5f5cbb46
2 changed files with 29 additions and 8 deletions
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35
libavformat/assdec.c
View File

@ -29,6 +29,7 @@
typedef struct ASSContext {
FFDemuxSubtitlesQueue q;
unsigned readorder;
} ASSContext;
static int ass_probe(AVProbeData *p)
@ -52,18 +53,36 @@ static int ass_read_close(AVFormatContext *s)
return 0;
}
static int read_ts(const uint8_t *p, int64_t *start, int *duration)
static int read_dialogue(ASSContext *ass, AVBPrint *dst, const uint8_t *p,
int64_t *start, int *duration)
{
int pos;
int64_t end;
int hh1, mm1, ss1, ms1;
int hh2, mm2, ss2, ms2;
if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
if (sscanf(p, "Dialogue: %*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d,%n",
&hh1, &mm1, &ss1, &ms1,
&hh2, &mm2, &ss2, &ms2) == 8) {
&hh2, &mm2, &ss2, &ms2, &pos) >= 8) {
/* This is not part of the sscanf itself in order to handle an actual
* number (which would be the Layer) or the form "Marked=N" (which is
* the old SSA field, now replaced by Layer, and will be lead to Layer
* being 0 here). */
const int layer = atoi(p + 10);
end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
*start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
*duration = end - *start;
av_bprint_clear(dst);
av_bprintf(dst, "%u,%d,%s", ass->readorder++, layer, p + pos);
/* right strip the buffer */
while (dst->len > 0 &&
dst->str[dst->len - 1] == '\r' ||
dst->str[dst->len - 1] == '\n')
dst->str[--dst->len] = 0;
return 0;
}
return -1;
@ -88,7 +107,7 @@ static int64_t get_line(AVBPrint *buf, FFTextReader *tr)
static int ass_read_header(AVFormatContext *s)
{
ASSContext *ass = s->priv_data;
AVBPrint header, line;
AVBPrint header, line, rline;
int header_remaining, res = 0;
AVStream *st;
FFTextReader tr;
@ -99,12 +118,13 @@ static int ass_read_header(AVFormatContext *s)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, 1, 100);
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codec->codec_id = AV_CODEC_ID_SSA;
st->codec->codec_id = AV_CODEC_ID_ASS;
header_remaining = INT_MAX;
av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
av_bprint_init(&line, 0, AV_BPRINT_SIZE_UNLIMITED);
av_bprint_init(&rline, 0, AV_BPRINT_SIZE_UNLIMITED);
for (;;) {
int64_t pos = get_line(&line, &tr);
@ -125,9 +145,9 @@ static int ass_read_header(AVFormatContext *s)
int duration = -1;
AVPacket *sub;
if (read_ts(line.str, &ts_start, &duration) < 0)
if (read_dialogue(ass, &rline, line.str, &ts_start, &duration) < 0)
continue;
sub = ff_subtitles_queue_insert(&ass->q, line.str, line.len, 0);
sub = ff_subtitles_queue_insert(&ass->q, rline.str, rline.len, 0);
if (!sub) {
res = AVERROR(ENOMEM);
goto end;
@ -139,6 +159,7 @@ static int ass_read_header(AVFormatContext *s)
}
av_bprint_finalize(&line, NULL);
av_bprint_finalize(&rline, NULL);
res = avpriv_bprint_to_extradata(st->codec, &header);
if (res < 0)

2
libavformat/version.h
View File

@ -31,7 +31,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 56
#define LIBAVFORMAT_VERSION_MINOR 7
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_MICRO 101
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \