nils/shairport-sync
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This commit is contained in:
Mike Brady
2021-09-05 10:13:17 +01:00
parent dd795d9157
commit 8ec99e806f
1 changed files with 9 additions and 9 deletions
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rtp.c
+9 -9
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@@ -290,8 +290,8 @@ void *rtp_control_receiver(void *arg) {
obfp += 2;
};
*obfp = 0;
// get raw timestamp information
// I think that a good way to understand these timestamps is that
// (1) the rtlt below is the timestamp of the frame that should be playing at the
@@ -302,19 +302,19 @@ void *rtp_control_receiver(void *arg) {
// Thus, (3) the latency can be calculated by subtracting the second from the
// first.
// There must be more to it -- there something missing.
// In addition, it seems that if the value of the short represented by the second
// pair of bytes in the packet is 7
// then an extra time lag is expected to be added, presumably by
// the AirPort Express.
// Best guess is that this delay is 11,025 frames.
uint32_t rtlt = nctohl(&packet[4]); // raw timestamp less latency
uint32_t rt = nctohl(&packet[16]); // raw timestamp
uint32_t fl = nctohs(&packet[2]); //
debug(1,"Sync Packet of %d bytes received: \"%s\", flags: %d, timestamps %u and %u,
giving a latency of %d frames.",plen,obf,fl,rt,rtlt,rt-rtlt);
//debug(1,"Monotonic timestamps are: %" PRId64 " and %" PRId64 "
@@ -2114,8 +2114,8 @@ void *rtp_buffered_audio_processor(void *arg) {
// initialize all muxers, demuxers and protocols for libavformat
// (does nothing if called twice during the course of one program execution)
// not needed in ffmpeg 4.0 and later... but still needed in ffmpeg 3.6 / ubuntu 18
// deprecated in ffmpeg 4.0 and later... but still needed in ffmpeg 3.6 / ubuntu 18
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
avcodec_register_all();