generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

* skiping unwanted packets when it's possible

Browse Source 
* using 64bits us timestamps (needs more checking)

Originally committed as revision 851 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Zdenek Kabelac 2002-08-09 13:06:27 +00:00
parent 840824970c
commit 1359c2d43e
1 changed files with 27 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
libav/asf.c
View File

@ -833,7 +833,7 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
if (!asf_st)
goto fail;
st->priv_data = asf_st;
st->time_length = (asf->hdr.send_time - asf->hdr.preroll) / 10000;
st->time_length = (asf->hdr.send_time - asf->hdr.preroll) / 10; // us
get_guid(pb, &g);
if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
type = CODEC_TYPE_AUDIO;
@ -852,7 +852,7 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
get_le32(pb);
st->codec.codec_type = type;
st->codec.frame_rate = 1000; // in packet ticks
st->codec.frame_rate = 1000000; // us
if (type == CODEC_TYPE_AUDIO) {
id = get_le16(pb);
st->codec.codec_tag = id;
@ -1018,15 +1018,13 @@ static int asf_get_packet(AVFormatContext *s)
uint32_t packet_length, padsize;
int rsize = 11;
int c = get_byte(pb);
if (c != 0x82)
{
if (c != 0x82) {
printf("BAD HRD %x at:%Ld\n", c, url_ftell(pb));
return -EIO;
}
if ((c & 0x0f) == 2) { // always true for now
if (get_le16(pb) != 0)
{
printf("BAD NO ZERO\n");
if (get_le16(pb) != 0) {
printf("ff asf BAD NO ZERO\n");
return -EIO;
}
}
@ -1062,19 +1060,16 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
ASFContext *asf = s->priv_data;
ASFStream *asf_st = 0;
ByteIOContext *pb = &s->pb;
static int pc = 0;
//static int pc = 0;
for (;;) {
int rsize = 0;
if (asf->packet_size_left < FRAME_HEADER_SIZE
|| asf->packet_segments < 0) {
|| asf->packet_segments < 1) {
//asf->packet_size_left <= asf->packet_padsize) {
int ret;
//printf("PACKETLEFTSIZE %d\n", asf->packet_size_left);
/* fail safe */
if (asf->packet_size_left)
url_fskip(pb, asf->packet_size_left);
if (asf->packet_padsize)
url_fskip(pb, asf->packet_padsize);
int ret = asf->packet_size_left + asf->packet_padsize;
//printf("PacketLeftSize:%d Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
/* fail safe */
url_fskip(pb, ret);
ret = asf_get_packet(s);
//printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
if (ret < 0)
@ -1083,24 +1078,12 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
continue;
}
if (asf->packet_time_start == 0) {
int num;
if (--asf->packet_segments < 0)
continue;
/* read frame header */
num = get_byte(pb);
int num = get_byte(pb);
asf->packet_segments--;
rsize++;
asf->packet_key_frame = (num & 0x80) >> 7;
asf->stream_index = asf->asfid2avid[num & 0x7f];
if (asf->stream_index < 0)
{
/* unhandled packet (should not happen) */
url_fskip(pb, asf->packet_frag_size);
asf->packet_size_left -= asf->packet_frag_size;
printf("ff asf skip %d %d\n", asf->packet_frag_size, num &0x7f);
continue;
}
asf->asf_st = s->streams[asf->stream_index]->priv_data;
//printf("ASFST %p %d <> %d\n", asf->asf_st, asf->stream_index, num & 0x7f);
// sequence should be ignored!
DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
@ -1122,7 +1105,6 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
rsize++;
}
}
if (asf->packet_flags & 0x01) {
DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
//printf("Fragsize %d\n", asf->packet_frag_size);
@ -1130,11 +1112,9 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
asf->packet_frag_size = asf->packet_size_left - rsize;
//printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
}
if (asf->packet_replic_size == 1)
{
if (asf->packet_replic_size == 1) {
asf->packet_multi_size = asf->packet_frag_size;
if (asf->packet_multi_size > asf->packet_size_left)
{
if (asf->packet_multi_size > asf->packet_size_left) {
asf->packet_segments = 0;
continue;
}
@ -1142,6 +1122,16 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
#undef DO_2BITS
asf->packet_size_left -= rsize;
//printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
if (asf->stream_index < 0) {
asf->packet_time_start = 0;
/* unhandled packet (should not happen) */
url_fskip(pb, asf->packet_frag_size);
asf->packet_size_left -= asf->packet_frag_size;
printf("ff asf skip %d %d\n", asf->packet_frag_size, num & 0x7f);
continue;
}
asf->asf_st = s->streams[asf->stream_index]->priv_data;
}
asf_st = asf->asf_st;
@ -1183,12 +1173,12 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
asf->packet_multi_size -= asf->packet_obj_size;
//printf("COMPRESS size %d %d %d ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
}
if (asf_st->frag_offset == 0) {
/* new packet */
av_new_packet(&asf_st->pkt, asf->packet_obj_size);
asf_st->seq = asf->packet_seq;
asf_st->pkt.pts = asf->packet_frag_timestamp - asf->hdr.preroll;
asf_st->pkt.pts *= 1000; // us
asf_st->pkt.stream_index = asf->stream_index;
if (asf->packet_key_frame)
asf_st->pkt.flags |= PKT_FLAG_KEY;
@ -1227,7 +1217,6 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
asf_st->pkt.data = newdata;
}
}
asf_st->frag_offset = 0;
memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
//printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
@ -1247,6 +1236,7 @@ static int asf_read_close(AVFormatContext *s)
for(i=0;i<s->nb_streams;i++) {
AVStream *st = s->streams[i];
av_free(st->priv_data);
av_free(st->extra_data);
}
//av_free(asf);
return 0;