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Compress headers for output RTMP packets. 

Patch by Sergiy (piratfmGMAIL)

Originally committed as revision 20728 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Sergiy 2009-12-04 15:01:58 +00:00 committed by Kostya Shishkov
parent 1e68cefe54
commit 84a29dc10a
1 changed files with 25 additions and 1 deletions
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26
libavformat/rtmppkt.c
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@ -155,7 +155,19 @@ int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
int off = 0;
pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;
//TODO: header compression
//if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
if (prev_pkt[pkt->channel_id].channel_id &&
pkt->extra == prev_pkt[pkt->channel_id].extra) {
if (pkt->type == prev_pkt[pkt->channel_id].type &&
pkt->data_size == prev_pkt[pkt->channel_id].data_size) {
mode = RTMP_PS_FOURBYTES;
if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)
mode = RTMP_PS_ONEBYTE;
} else {
mode = RTMP_PS_EIGHTBYTES;
}
}
if (pkt->channel_id < 64) {
bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
} else if (pkt->channel_id < 64 + 256) {
@ -179,6 +191,18 @@ int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
if (timestamp >= 0xFFFFFF)
bytestream_put_be32(&p, timestamp);
}
// save history
prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
prev_pkt[pkt->channel_id].type = pkt->type;
prev_pkt[pkt->channel_id].data_size = pkt->data_size;
prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
if (mode != RTMP_PS_TWELVEBYTES) {
prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;
} else {
prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;
}
prev_pkt[pkt->channel_id].extra = pkt->extra;
url_write(h, pkt_hdr, p-pkt_hdr);
while (off < pkt->data_size) {
int towrite = FFMIN(chunk_size, pkt->data_size - off);