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more AirPlay - release

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This commit is contained in:
Philippe G
2020-04-26 12:56:56 -07:00
parent 7a44e379ed
commit bb1266ed5d
1 changed files with 45 additions and 39 deletions
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84
components/squeezelite/decode_external.c
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@@ -43,15 +43,15 @@ static bool enable_bt_sink;
static bool enable_airplay;
#define RAOP_OUTPUT_SIZE (RAOP_SAMPLE_RATE * 2 * 2 * 2 * 1.2)
#define SYNC_WIN_RUN 32
#define SYNC_WIN_SLOW 32
#define SYNC_WIN_CHECK 8
#define SYNC_WIN_START 2
#define SYNC_WIN_FAST 2
static raop_event_t raop_state;
static EXT_RAM_ATTR struct {
bool enabled;
int sum, count, win, errors[SYNC_WIN_RUN];
bool enabled, init;
int sum, count, win, errors[SYNC_WIN_SLOW];
s32_t len;
u32_t start_time, playtime;
} raop_sync;
@@ -181,6 +181,21 @@ static void raop_sink_data_handler(const uint8_t *data, uint32_t len, u32_t play
sink_data_handler(data, len);
}
/****************************************************************************************
* AirPlay apply sync
*/
static void resync(int error) {
if (error < 0) {
output.skip_frames = -(error * RAOP_SAMPLE_RATE) / 1000;
output.state = OUTPUT_SKIP_FRAMES;
LOG_INFO("skipping %u frames (count:%d)", output.skip_frames, raop_sync.count);
} else {
output.pause_frames = (error * RAOP_SAMPLE_RATE) / 1000;
output.state = OUTPUT_PAUSE_FRAMES;
LOG_INFO("pausing for %u frames (count: %d)", output.pause_frames, raop_sync.count);
}
}
/****************************************************************************************
* AirPlay sink command handler
*/
@@ -202,15 +217,21 @@ static bool raop_sink_cmd_handler(raop_event_t event, va_list args)
u32_t ms, now = gettime_ms();
int error;
if (!raop_sync.enabled || output.state < OUTPUT_RUNNING || output.frames_played_dmp < output.device_frames) break;
if (!raop_sync.enabled || output.state != OUTPUT_RUNNING || output.frames_played_dmp < output.device_frames) break;
// first must make sure we started on time
if (raop_sync.win == SYNC_WIN_START) {
// do one (only one) time-based adjustement in case we started totally off)
if (raop_sync.init) {
// how many ms have we really played
ms = now - output.updated + ((output.frames_played_dmp - output.device_frames) * 10) / (RAOP_SAMPLE_RATE / 100);
error = ms - (now - raop_sync.start_time);
resync(error);
LOG_INFO("backend played %u, desired %u, (delta:%d)", ms, now - raop_sync.start_time, error);
raop_sync.init = false;
raop_sync.win = SYNC_WIN_FAST;
raop_sync.sum = raop_sync.count = 0 ;
memset(raop_sync.errors, 0, sizeof(raop_sync.errors));
} else {
u32_t level = _buf_used(outputbuf);
@@ -224,37 +245,24 @@ static bool raop_sink_cmd_handler(raop_event_t event, va_list args)
LOG_INFO("head local:%d, remote:%d (delta:%d)", ms, raop_sync.playtime - now, error);
LOG_INFO("obuf:%u, sync_len:%u, devframes:%u, inproc:%u", _buf_used(outputbuf), raop_sync.len, output.device_frames, output.frames_in_process);
}
}
// calculate sum, error and update sliding window
raop_sync.errors[raop_sync.count++ % raop_sync.win] = error;
raop_sync.sum += error;
error = raop_sync.sum / min(raop_sync.count, raop_sync.win);
// calculate sum, error and update sliding window
raop_sync.errors[raop_sync.count++ % raop_sync.win] = error;
raop_sync.sum += error;
error = raop_sync.sum / min(raop_sync.count, raop_sync.win);
// move to normal mode if possible
if (raop_sync.win == SYNC_WIN_START && raop_sync.count >= SYNC_WIN_START && abs(error) < 10) {
raop_sync.win = SYNC_WIN_RUN;
LOG_INFO("switching to slow sync mode %u", raop_sync.win);
}
// move to normal mode if possible
if (raop_sync.win == SYNC_WIN_FAST && raop_sync.count >= SYNC_WIN_FAST && abs(error) < 10) {
raop_sync.win = SYNC_WIN_SLOW;
LOG_INFO("switching to slow sync mode %u", raop_sync.win);
}
// wait till e have enough data or there is a strong deviation
if ((raop_sync.count >= raop_sync.win && abs(error) > 10) || (raop_sync.count >= SYNC_WIN_CHECK && abs(error) > 100)) {
// correct if needed
if (error < 0) {
output.skip_frames = -(error * RAOP_SAMPLE_RATE) / 1000;
output.state = OUTPUT_SKIP_FRAMES;
LOG_INFO("skipping %u frames (count:%d)", output.skip_frames, raop_sync.count);
} else {
output.pause_frames = (error * RAOP_SAMPLE_RATE) / 1000;
output.state = OUTPUT_PAUSE_FRAMES;
LOG_INFO("pausing for %u frames (count: %d)", output.pause_frames, raop_sync.count);
}
// reset sliding window
raop_sync.sum = raop_sync.count = 0;
memset(raop_sync.errors, 0, sizeof(raop_sync.errors));
// wait till we have enough data or there is a strong deviation
if ((raop_sync.count >= raop_sync.win && abs(error) > 10) || (raop_sync.count >= SYNC_WIN_CHECK && abs(error) > 100)) {
resync(error);
raop_sync.sum = raop_sync.count = 0;
memset(raop_sync.errors, 0, sizeof(raop_sync.errors));
}
}
break;
@@ -271,9 +279,7 @@ static bool raop_sink_cmd_handler(raop_event_t event, va_list args)
case RAOP_STREAM:
LOG_INFO("Stream", NULL);
raop_state = event;
raop_sync.win = SYNC_WIN_START;
raop_sync.sum = raop_sync.count = 0 ;
memset(raop_sync.errors, 0, sizeof(raop_sync.errors));
raop_sync.init = true;
raop_sync.enabled = !strcasestr(output.device, "BT");
output.next_sample_rate = output.current_sample_rate = RAOP_SAMPLE_RATE;
break;