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Code Issues Releases Activity

fix timestamp rounding in syncpoints

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index reading (unfinished and disabled)

Originally committed as revision 6979 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-11-12 12:07:42 +00:00
parent 6dd2cdf4b0
commit e827202955
1 changed files with 103 additions and 2 deletions
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105
libavformat/nutdec.c
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@ -199,7 +199,7 @@ static int nut_probe(AVProbeData *p){
static int skip_reserved(ByteIOContext *bc, int64_t pos){
pos -= url_ftell(bc);
av_log(NULL, AV_LOG_ERROR, "skip %d\n", (int)pos);
if(pos<0){
url_fseek(bc, pos, SEEK_CUR);
return -1;
@ -459,7 +459,11 @@ static int decode_syncpoint(NUTContext *nut){
time_base= nut->time_base[tmp % nut->time_base_count];
for(i=0; i<s->nb_streams; i++){
nut->stream[i].last_pts= av_rescale_q(tmp / nut->time_base_count, time_base, nut->stream[i].time_base); //FIXME rounding and co
nut->stream[i].last_pts= av_rescale_rnd(
tmp / nut->time_base_count,
time_base.num * (int64_t)nut->stream[i].time_base.den,
time_base.den * (int64_t)nut->stream[i].time_base.num,
AV_ROUND_DOWN);
//last_key_frame ?
}
//FIXME put this in a reset func maybe
@ -471,6 +475,96 @@ static int decode_syncpoint(NUTContext *nut){
return 0;
}
static int find_and_decode_index(NUTContext *nut){
AVFormatContext *s= nut->avf;
ByteIOContext *bc = &s->pb;
uint64_t tmp, end;
int i, j, syncpoint_count;
int64_t filesize= url_fsize(bc);
int64_t *syncpoints;
int8_t *has_keyframe;
url_fseek(bc, filesize-12, SEEK_SET);
url_fseek(bc, filesize-get_be64(bc), SEEK_SET);
if(get_be64(bc) != INDEX_STARTCODE){
av_log(s, AV_LOG_ERROR, "no index at the end\n");
return -1;
}
end= get_packetheader(nut, bc, 1);
end += url_ftell(bc) - 4;
get_v(bc); //max_pts
GET_V(syncpoint_count, tmp < INT_MAX/8 && tmp > 0)
syncpoints= av_malloc(sizeof(int64_t)*syncpoint_count);
has_keyframe= av_malloc(sizeof(int8_t)*(syncpoint_count+1));
for(i=0; i<syncpoint_count; i++){
GET_V(syncpoints[i], tmp>0)
if(i)
syncpoints[i] += syncpoints[i-1];
}
for(i=0; i<s->nb_streams; i++){
int64_t last_pts= -1;
for(j=0; j<syncpoint_count;){
uint64_t x= get_v(bc);
int type= x&1;
int n= j;
x>>=1;
if(type){
int flag= x&1;
x>>=1;
if(n+x >= syncpoint_count + 1){
av_log(s, AV_LOG_ERROR, "index overflow A\n");
return -1;
}
while(x--)
has_keyframe[n++]= flag;
has_keyframe[n++]= !flag;
}else{
while(x != 1){
if(n>=syncpoint_count + 1){
av_log(s, AV_LOG_ERROR, "index overflow B\n");
return -1;
}
has_keyframe[n++]= x&1;
x>>=1;
}
}
if(has_keyframe[0]){
av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
return -1;
}
assert(n<=syncpoint_count+1);
for(; j<n; j++){
if(has_keyframe[j]){
uint64_t B, A= get_v(bc);
if(!A){
A= get_v(bc);
B= get_v(bc);
//eor_pts[j][i] = last_pts + A + B
}else
B= 0;
av_add_index_entry(
s->streams[i],
16*syncpoints[j-1],
last_pts + A,
0,
0,
AVINDEX_KEYFRAME);
last_pts += A + B;
}
}
}
}
if(skip_reserved(bc, end) || check_checksum(bc)){
av_log(s, AV_LOG_ERROR, "Index checksum mismatch\n");
return -1;
}
return 0;
}
static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
NUTContext *nut = s->priv_data;
@ -523,6 +617,13 @@ static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
s->data_offset= pos-8;
if(0 &&!url_is_streamed(bc)){
int64_t orig_pos= url_ftell(bc);
find_and_decode_index(nut);
url_fseek(bc, orig_pos, SEEK_SET);
}
assert(nut->next_startcode == SYNCPOINT_STARTCODE);
return 0;
}