generic-library/ffmpeg
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seeking fixes

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memleaks
  infinite loops
  uninitalized variables
with some luck u can seek now a few times before it dies

Originally committed as revision 2702 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-01-14 18:18:47 +00:00
parent 580fb5e72c
commit 82b9e4a286
1 changed files with 56 additions and 41 deletions
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97
libavformat/asf.c
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@ -41,6 +41,8 @@ typedef struct {
int ds_chunk_size;
int ds_data_size;
int ds_silence_data;
int packet_pos;
} ASFStream;
@ -116,6 +118,7 @@ typedef struct {
int packet_obj_size;
int packet_time_delta;
int packet_time_start;
int packet_pos;
int stream_index;
ASFStream* asf_st; /* currently decoded stream */
@ -1117,6 +1120,7 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
//printf("PacketLeftSize:%d Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
/* fail safe */
url_fskip(pb, ret);
asf->packet_pos= url_ftell(&s->pb);
ret = asf_get_packet(s);
//printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
if (ret < 0 || url_feof(pb))
@ -1135,7 +1139,7 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
//printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
if (asf->packet_replic_size > 1) {
// it should be always at least 8 bytes - FIXME validate
asf->packet_obj_size = get_le32(pb);
@ -1228,6 +1232,10 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
asf_st->seq = asf->packet_seq;
asf_st->pkt.pts = asf->packet_frag_timestamp - asf->hdr.preroll;
asf_st->pkt.stream_index = asf->stream_index;
asf_st->packet_pos= asf->packet_pos;
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d\n",
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
//s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO);
if (s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO)
asf->packet_key_frame = 1;
if (asf->packet_key_frame)
@ -1304,6 +1312,8 @@ static int64_t asf_align(AVFormatContext *s, int64_t pos){
static void asf_reset_header(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
ASFStream *asf_st;
int i;
asf->packet_nb_frames = 0;
asf->packet_timestamp_start = -1;
@ -1326,30 +1336,41 @@ static void asf_reset_header(AVFormatContext *s)
asf->packet_obj_size = 0;
asf->packet_time_delta = 0;
asf->packet_time_start = 0;
for(i=0; i<s->nb_streams; i++){
asf_st= s->streams[i]->priv_data;
av_free_packet(&asf_st->pkt);
asf_st->frag_offset=0;
asf_st->seq=0;
}
asf->asf_st= NULL;
}
static int64_t asf_read_pts(AVFormatContext *s, int64_t *ppos, int stream_index)
{
ASFContext *asf = s->priv_data;
AVPacket pkt1, *pkt = &pkt1;
int64_t pos= *ppos;
ASFStream *asf_st;
int64_t pts;
int64_t pos= *ppos;
// ensure we are on the packet boundry
assert(pos % asf->packet_size == 0);
//printf("asf_read_pts\n");
url_fseek(&s->pb, pos + s->data_offset, SEEK_SET);
asf_reset_header(s);
do{
pos= url_ftell(&s->pb) - s->data_offset;
asf_reset_header(s);
if (av_read_frame(s, pkt) < 0)
if (av_read_frame(s, pkt) < 0){
printf("seek failed\n");
return AV_NOPTS_VALUE;
}
pts= pkt->pts;
av_free_packet(pkt);
}while(pkt->stream_index != stream_index);
*ppos= pos;
}while(pkt->stream_index != stream_index || !(pkt->flags&PKT_FLAG_KEY));
asf_st= s->streams[stream_index]->priv_data;
*ppos= asf_st->packet_pos - s->data_offset;
//printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
return pts;
}
@ -1361,7 +1382,7 @@ static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts)
AVPacket pkt1, *pkt;
int block_align;
int64_t pos;
int64_t pos_min, pos_max, pts_min, pts_max, cur_pts;
int64_t pos_min, pos_max, pts_min, pts_max, cur_pts, pos_limit;
pkt = &pkt1;
@ -1386,48 +1407,42 @@ static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts)
pos_max = asf_align(s, url_filesize(url_fileno(&s->pb)) - 1 - s->data_offset); //FIXME wrong
pts_max = pts_min + s->duration;
pos_limit= pos_max;
while (pos_min <= pos_max) {
while (pos_min < pos_limit) {
int64_t start_pos;
if (pts <= pts_min) {
pos = pos_min;
goto found;
} else if (pts >= pts_max) {
pos = pos_max;
goto found;
} else {
// interpolate position (better than dichotomy)
pos = (int64_t)((double)(pos_max - pos_min) *
(double)(pts - pts_min) /
(double)(pts_max - pts_min)) + pos_min;
pos= asf_align(s, pos);
}
assert(pos_limit <= pos_max);
// interpolate position (better than dichotomy)
pos = (int64_t)((double)(pos_limit - pos_min) *
(double)(pts - pts_min) /
(double)(pts_max - pts_min)) + pos_min;
pos= asf_align(s, pos);
if(pos <= pos_min)
pos= pos_min + asf->packet_size;
else if(pos > pos_limit)
pos= pos_limit;
start_pos= pos;
// read the next timestamp
cur_pts = asf_read_pts(s, &pos, stream_index);
/* check if we are lucky */
if (pts == cur_pts) {
goto found;
} else if (cur_pts == AV_NOPTS_VALUE) {
return -1;
if (cur_pts == AV_NOPTS_VALUE) {
return -1;
} else if (pts < cur_pts) {
pos_limit = start_pos - asf->packet_size;
pos_max = pos;
pts_max = asf_read_pts(s, &pos_max, stream_index); //FIXME wrong, must do backward search, or change this somehow
if (pts >= pts_max) {
pos = pos_max;
goto found;
}
pts_max = cur_pts;
} else {
pos_min = pos + asf->packet_size;
pts_min = asf_read_pts(s, &pos_min, stream_index);
if (pts <= pts_min) {
goto found;
}
pos_min = pos;
pts_min = cur_pts;
/* check if we are lucky */
if (pts == cur_pts)
break;
}
}
pos = pos_min;
found:
url_fseek(&s->pb, pos + s->data_offset, SEEK_SET);
asf_reset_header(s);
return 0;