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Pass key frame flag from the device

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MediaCodec indicates when a packet is a key frame. Transmit it to the
client.
This commit is contained in:
Romain Vimont
2022-02-11 19:33:35 +01:00
parent e3c2398aa2
commit 67068e4e3d
2 changed files with 15 additions and 5 deletions
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16
app/src/demuxer.c
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@@ -15,8 +15,9 @@
#define HEADER_SIZE 12
#define SC_PACKET_FLAG_CONFIG (UINT64_C(1) << 63)
#define SC_PACKET_FLAG_KEY_FRAME (UINT64_C(1) << 62)
#define SC_PACKET_PTS_MASK (SC_PACKET_FLAG_CONFIG - 1)
#define SC_PACKET_PTS_MASK (SC_PACKET_FLAG_KEY_FRAME - 1)
static bool
sc_demuxer_recv_packet(struct sc_demuxer *demuxer, AVPacket *packet) {
@@ -35,10 +36,11 @@ sc_demuxer_recv_packet(struct sc_demuxer *demuxer, AVPacket *packet) {
// The most significant bits of the PTS are used for packet flags:
//
// byte 7 byte 6 byte 5 byte 4 byte 3 byte 2 byte 1 byte 0
// C....... ........ ........ ........ ........ ........ ........ ........
// ^<-------------------------------------------------------------------->
// | PTS
// `- config packet
// CK...... ........ ........ ........ ........ ........ ........ ........
// ^^<------------------------------------------------------------------->
// || PTS
// | `- config packet
// `-- key frame
uint8_t header[HEADER_SIZE];
ssize_t r = net_recv_all(demuxer->socket, header, HEADER_SIZE);
@@ -67,6 +69,10 @@ sc_demuxer_recv_packet(struct sc_demuxer *demuxer, AVPacket *packet) {
packet->pts = pts_flags & SC_PACKET_PTS_MASK;
}
if (pts_flags & SC_PACKET_FLAG_KEY_FRAME) {
packet->flags |= AV_PKT_FLAG_KEY;
}
return true;
}