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Code Issues Releases Activity

msb pts support

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Originally committed as revision 2576 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Beregszaszi 2003-12-08 17:54:40 +00:00
parent 4250dafc96
commit f0a93eb0b2
1 changed files with 49 additions and 14 deletions
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63
libavformat/nut.c
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@ -50,6 +50,8 @@ typedef struct {
int curr_frame_start;
int last_frame_size;
int curr_frame_size;
int *msb_timestamp_shift;
int64_t *last_msb_timestamp;
} NUTContext;
static int bytes_left(ByteIOContext *bc)
@ -234,6 +236,11 @@ static int nut_write_header(AVFormatContext *s)
update_packetheader(nut, bc, 0);
nut->msb_timestamp_shift =
av_mallocz(sizeof(nut->msb_timestamp_shift)*s->nb_streams);
nut->last_msb_timestamp =
av_mallocz(sizeof(nut->last_msb_timestamp)*s->nb_streams);
/* stream headers */
for (i = 0; i < s->nb_streams; i++)
{
@ -272,7 +279,8 @@ static int nut_write_header(AVFormatContext *s)
put_v(bc, 0); /* no language code */
put_v(bc, nom);
put_v(bc, denom);
put_v(bc, 0); /* msb timestamp_shift */
nut->msb_timestamp_shift[i] = 0;
put_v(bc, nut->msb_timestamp_shift[i]);
put_v(bc, 0); /* shuffle type */
put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
@ -344,31 +352,45 @@ static int nut_write_packet(AVFormatContext *s, int stream_index,
{
NUTContext *nut = s->priv_data;
ByteIOContext *bc = &s->pb;
int key_frame = 0;
int flags;
int key_frame = 0, flags, msb_pts = 0;
AVCodecContext *enc;
int64_t lsb_pts;
if (stream_index > s->nb_streams)
return 1;
enc = &s->streams[stream_index]->codec;
key_frame = enc->coded_frame->key_frame;
// FIXME, lavc reports always keyframes for audio, which will make
// _huge_ overhead
if (enc->codec_type == CODEC_TYPE_VIDEO)
key_frame = enc->coded_frame->key_frame;
if (key_frame)
put_be64(bc, KEYFRAME_STARTCODE);
if (key_frame /*||
((pts - (nut->last_msb_timestamp[stream_index] <<
nut->msb_timestamp_shift[stream_index])) > 1024)*/)
{
msb_pts = 1;
nut->last_msb_timestamp[stream_index] = pts >> nut->msb_timestamp_shift[stream_index];
}
lsb_pts = pts - (nut->last_msb_timestamp[stream_index] << nut->msb_timestamp_shift[stream_index]);
flags=0;
flags<<=2; flags|=1; //priority
flags<<=1; flags|=0; //checksum
flags<<=1; flags|=0; //msb_timestamp_flag
flags<<=1; flags|=msb_pts; //msb_timestamp_flag
flags<<=2; flags|=1; //subpacket_type
flags<<=1; flags|=0; //reserved
if (key_frame)
put_be64(bc, KEYFRAME_STARTCODE);
put_byte(bc, flags);
put_packetheader(nut, bc, size+20);
put_v(bc, stream_index);
put_s(bc, pts); /* lsb_timestamp */
if (msb_pts)
put_v(bc, nut->last_msb_timestamp[stream_index]);
put_v(bc, lsb_pts); /* lsb_timestamp */
update_packetheader(nut, bc, size);
put_buffer(bc, buf, size);
@ -380,6 +402,7 @@ static int nut_write_packet(AVFormatContext *s, int stream_index,
static int nut_write_trailer(AVFormatContext *s)
{
NUTContext *nut = s->priv_data;
ByteIOContext *bc = &s->pb;
#if 0
int i;
@ -398,6 +421,11 @@ static int nut_write_trailer(AVFormatContext *s)
#endif
put_flush_packet(bc);
if (nut->last_msb_timestamp)
av_free(nut->last_msb_timestamp);
if (nut->msb_timestamp_shift)
av_free(nut->msb_timestamp_shift);
return 0;
}
@ -439,6 +467,11 @@ static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
get_be32(bc); /* checkusm */
s->bit_rate = 0;
nut->msb_timestamp_shift =
av_malloc(sizeof(nut->msb_timestamp_shift)*s->nb_streams);
nut->last_msb_timestamp =
av_malloc(sizeof(nut->last_msb_timestamp)*s->nb_streams);
/* stream header */
for (cur_stream = 0; cur_stream < nb_streams; cur_stream++)
@ -477,7 +510,7 @@ static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
get_b(bc, NULL, 0); /* language code */
nom = get_v(bc);
denom = get_v(bc);
get_v(bc); /* FIXME: msb timestamp base */
nut->msb_timestamp_shift[cur_stream] = get_v(bc);
get_v(bc); /* shuffle type */
get_byte(bc); /* flags */
@ -512,10 +545,10 @@ static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
{
NUTContext *nut = s->priv_data;
ByteIOContext *bc = &s->pb;
int id, timestamp, size;
int id, size;
int key_frame = 0;
uint64_t tmp;
int64_t pts = 0;
if (url_feof(bc))
return -1;
@ -540,10 +573,12 @@ static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
fprintf(stderr, "sanity check failed!\n");
#endif
id = get_v(bc);
timestamp = get_s(bc);
if ((tmp & 0x8) >> 3)
pts = get_v(bc) << nut->msb_timestamp_shift[id];
pts += get_v(bc);
size = (nut->curr_frame_size - (url_ftell(bc)-nut->curr_frame_start));
dprintf("flags: 0x%Lx, timestamp: %d, packet size: %d\n", tmp, timestamp, size);
dprintf("flags: 0x%llx, timestamp: %llx, packet size: %d\n", tmp, pts, size);
if (size < 0)
return -1;
@ -553,7 +588,7 @@ static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
pkt->stream_index = id;
if (key_frame)
pkt->flags |= PKT_FLAG_KEY;
pkt->pts = timestamp;
pkt->pts = pts;
return 0;
}