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Improve AirPlay robustness to bad network conditions - release

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need to add a decent PID loop ...
This commit is contained in:
philippe44
2020-03-08 21:47:27 -07:00
parent b60ea2e356
commit 6398bbfe9f
1 changed files with 13 additions and 13 deletions
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26
components/raop/rtp.c
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@@ -510,14 +510,14 @@ static void buffer_push_packet(rtp_t *ctx) {
int i;
// not ready to play yet
if (!ctx->playing || ctx->synchro.status != (RTP_SYNC | NTP_SYNC)) return;
// maybe re-evaluate time in loop in case data callback blocks ...
if (!ctx->playing || ctx->synchro.status != (RTP_SYNC | NTP_SYNC)) return;
// there is always at least one frame in the buffer
do {
// re-evaluate time in loop in case data callback blocks ...
now = gettime_ms();
// try to manage playtime so that we overflow as late as possible if we miss NTP (2^31 / 10 / 44100)
curframe = ctx->audio_buffer + BUFIDX(ctx->ab_read);
playtime = ctx->synchro.time + (((s32_t)(curframe->rtptime - ctx->synchro.rtp)) * 10) / (RAOP_SAMPLE_RATE / 100);
@@ -653,9 +653,14 @@ static void *rtp_thread_func(void *arg) {
u32_t rtp_now_latency = ntohl(*(u32_t*)(pktp+4));
u64_t remote = (((u64_t) ntohl(*(u32_t*)(pktp+8))) << 32) + ntohl(*(u32_t*)(pktp+12));
u32_t rtp_now = ntohl(*(u32_t*)(pktp+16));
u16_t flags = ntohs(*(u16_t*)(pktp+2));
u16_t flags = ntohs(*(u16_t*)(pktp+2));
u32_t remote_gap = NTP2MS(remote - ctx->timing.remote);
// try to get NTP every 3 sec or every time if we are not synced
if (!count-- || !(ctx->synchro.status && NTP_SYNC)) {
rtp_request_timing(ctx);
count = 3;
}
// something is wrong, we should not have such gap
if (remote_gap > 10000) {
@@ -683,11 +688,6 @@ static void *rtp_thread_func(void *arg) {
pthread_mutex_unlock(&ctx->ab_mutex);
LOG_DEBUG("[%p]: sync packet latency:%d rtp_latency:%u rtp:%u remote ntp:%llx, local time:%u local rtp:%u (now:%u)",
ctx, ctx->latency, rtp_now_latency, rtp_now, remote, ctx->synchro.time, ctx->synchro.rtp, gettime_ms());
if (!count--) {
rtp_request_timing(ctx);
LOG_DEBUG("[%p]: sync packet latency:%d rtp_latency:%u rtp:%u remote ntp:%llx, local time:%u local rtp:%u (now:%u)",
ctx, ctx->latency, rtp_now_latency, rtp_now, remote, ctx->synchro.time, ctx->synchro.rtp, gettime_ms());
@@ -699,7 +699,7 @@ static void *rtp_thread_func(void *arg) {
// NTP timing packet
case 0x53: {
u64_t expected;
u32_t reference = ntohl(*(u32_t*)(pktp+12)); // only low 32 bits in our case
u32_t reference = ntohl(*(u32_t*)(pktp+12)); // only low 32 bits in our case
u64_t remote =(((u64_t) ntohl(*(u32_t*)(pktp+16))) << 32) + ntohl(*(u32_t*)(pktp+20));
u32_t roundtrip = gettime_ms() - reference;
@@ -785,7 +785,7 @@ static bool rtp_request_resend(rtp_t *ctx, seq_t first, seq_t last) {
static bool rtp_request_resend(rtp_t *ctx, seq_t first, seq_t last) {
unsigned char req[8]; // *not* a standard RTCP NACK
// do not request silly ranges (happens in case of network large blackouts)
// do not request silly ranges (happens in case of network large blackouts)
if (seq_order(last, first) || last - first > BUFFER_FRAMES / 2) return false;
ctx->resent_req += (seq_t) (last - first) + 1;