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asfenc: mux chapters in ASF files using an ASF "marker" section

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ASF markers only have a start time, so we lose the chapter end times,
but that is ASF for you

Signed-off-by: Vladimir Pantelic <vladoman@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Vladimir Pantelic 2013-09-19 17:50:38 +02:00 committed by Anton Khirnov
parent 09f3c937ed
commit bb461370e3
3 changed files with 67 additions and 2 deletions
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1
Changelog
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@ -36,6 +36,7 @@ version 10:
- WebP decoder
- Error Resilient AAC syntax (ER AAC LC) decoding
- Low Delay AAC (ER AAC LD) decoding
- mux chapters in ASF files
version 9:

66
libavformat/asfenc.c
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@ -20,6 +20,7 @@
*/
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
@ -287,6 +288,64 @@ static int64_t unix_to_file_time(int ti)
return t;
}
static int32_t get_send_time(ASFContext *asf, int64_t pres_time, uint64_t *offset)
{
int i;
int32_t send_time = 0;
*offset = asf->data_offset + DATA_HEADER_SIZE;
for (i = 0; i < asf->nb_index_count; i++) {
if (pres_time <= asf->index_ptr[i].send_time)
break;
send_time = asf->index_ptr[i].send_time;
*offset = asf->index_ptr[i].offset;
}
return send_time / 10000;
}
static int asf_write_markers(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
int i;
AVRational scale = {1, 10000000};
int64_t hpos = put_header(pb, &ff_asf_marker_header);
put_guid(pb, &ff_asf_reserved_4); // ASF spec mandates this reserved value
avio_wl32(pb, s->nb_chapters); // markers count
avio_wl16(pb, 0); // ASF spec mandates 0 for this
avio_wl16(pb, 0); // name length 0, no name given
for (i = 0; i < s->nb_chapters; i++) {
AVChapter *c = s->chapters[i];
AVDictionaryEntry *t = av_dict_get(c->metadata, "title", NULL, 0);
int64_t pres_time = av_rescale_q(c->start, c->time_base, scale);
uint64_t offset;
int32_t send_time = get_send_time(asf, pres_time, &offset);
int len = 0;
uint8_t *buf;
AVIOContext *dyn_buf;
if (t) {
if (avio_open_dyn_buf(&dyn_buf) < 0)
return AVERROR(ENOMEM);
avio_put_str16le(dyn_buf, t->value);
len = avio_close_dyn_buf(dyn_buf, &buf);
}
avio_wl64(pb, offset); // offset of the packet with send_time
avio_wl64(pb, pres_time + PREROLL_TIME * 10000); // presentation time
avio_wl16(pb, 12 + len); // entry length
avio_wl32(pb, send_time); // send time
avio_wl32(pb, 0); // flags, should be 0
avio_wl32(pb, len / 2); // marker desc length in WCHARS!
if (t) {
avio_write(pb, buf, len); // marker desc
av_freep(&buf);
}
}
end_header(pb, hpos);
return 0;
}
/* write the header (used two times if non streamed) */
static int asf_write_header1(AVFormatContext *s, int64_t file_size,
int64_t data_chunk_size)
@ -388,7 +447,12 @@ static int asf_write_header1(AVFormatContext *s, int64_t file_size,
}
end_header(pb, hpos);
}
/* chapters using ASF markers */
if (!asf->is_streamed && s->nb_chapters) {
int ret;
if (ret = asf_write_markers(s))
return ret;
}
/* stream headers */
for (n = 0; n < s->nb_streams; n++) {
int64_t es_pos;

2
libavformat/version.h
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@ -31,7 +31,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 55
#define LIBAVFORMAT_VERSION_MINOR 5
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_MICRO 1
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \