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Code Issues Releases Activity

NSV : Add TOC2 parsing and seeking support.

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Originally committed as revision 18662 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jai Menon 2009-04-22 19:37:57 +00:00
parent 6c73a7d06c
commit 4fabb60ddb
1 changed files with 40 additions and 14 deletions
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54
libavformat/nsvdec.c
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@ -181,6 +181,7 @@ typedef struct {
uint16_t vwidth, vheight;
int16_t avsync;
AVRational framerate;
uint32_t *nsvs_timestamps;
//DVDemuxContext* dv_demux;
} NSVContext;
@ -348,12 +349,22 @@ static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
PRINT(("NSV got infos; filepos %"PRId64"\n", url_ftell(pb)));
if (table_entries_used > 0) {
int i;
nsv->index_entries = table_entries_used;
if((unsigned)table_entries >= UINT_MAX / sizeof(uint32_t))
if((unsigned)table_entries_used >= UINT_MAX / sizeof(uint32_t))
return -1;
nsv->nsvs_file_offset = av_malloc(table_entries * sizeof(uint32_t));
#warning "FIXME: Byteswap buffer as needed"
get_buffer(pb, (unsigned char *)nsv->nsvs_file_offset, table_entries * sizeof(uint32_t));
nsv->nsvs_file_offset = av_malloc((unsigned)table_entries_used * sizeof(uint32_t));
for(i=0;i<table_entries_used;i++)
nsv->nsvs_file_offset[i] = get_le32(pb) + size;
if(table_entries > table_entries_used &&
get_le32(pb) == MKTAG('T','O','C','2')) {
nsv->nsvs_timestamps = av_malloc((unsigned)table_entries_used*sizeof(uint32_t));
for(i=0;i<table_entries_used;i++) {
nsv->nsvs_timestamps[i] = get_le32(pb);
}
}
}
PRINT(("NSV got index; filepos %"PRId64"\n", url_ftell(pb)));
@ -436,6 +447,7 @@ static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
nsv->vwidth = vwidth;
nsv->vheight = vwidth;
if (vtag != T_NONE) {
int i;
st = av_new_stream(s, NSV_ST_VIDEO);
if (!st)
goto fail;
@ -454,6 +466,16 @@ static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
av_set_pts_info(st, 64, framerate.den, framerate.num);
st->start_time = 0;
st->duration = av_rescale(nsv->duration, framerate.num, 1000*framerate.den);
for(i=0;i<nsv->index_entries;i++) {
if(nsv->nsvs_timestamps) {
av_add_index_entry(st, nsv->nsvs_file_offset[i], nsv->nsvs_timestamps[i],
0, 0, AVINDEX_KEYFRAME);
} else {
int64_t ts = av_rescale(i*nsv->duration/nsv->index_entries, framerate.num, 1000*framerate.den);
av_add_index_entry(st, nsv->nsvs_file_offset[i], ts, 0, 0, AVINDEX_KEYFRAME);
}
}
}
if (atag != T_NONE) {
#ifndef DISABLE_AUDIO
@ -684,15 +706,19 @@ static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
#if 0
NSVContext *avi = s->priv_data;
AVStream *st;
NSVStream *ast;
int frame_number, i;
int64_t pos;
#endif
NSVContext *nsv = s->priv_data;
AVStream *st = s->streams[stream_index];
NSVStream *nst = st->priv_data;
int index;
return -1;
index = av_index_search_timestamp(st, timestamp, flags);
if(index < 0)
return -1;
url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
nst->frame_offset = st->index_entries[index].timestamp;
nsv->state = NSV_UNSYNC;
return 0;
}
static int nsv_read_close(AVFormatContext *s)
@ -700,8 +726,8 @@ static int nsv_read_close(AVFormatContext *s)
/* int i; */
NSVContext *nsv = s->priv_data;
if (nsv->index_entries)
av_free(nsv->nsvs_file_offset);
av_freep(&nsv->nsvs_file_offset);
av_freep(&nsv->nsvs_timestamps);
#if 0