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bluetooth: allow increasing output bitrate

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Bluetooth thread may ask encoder to reduce bitrate if writing is not keeping up
with inputs or writing to bluetooth socket takes too much time.

Assuming conditions leading to reduced bitrate are intermittent, allow periodic
attempts to increase encoder bitrate, by default at most twice per second.

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/481>
This commit is contained in:
Igor V. Kovalenko 2021-01-20 12:51:14 +03:00 • committed by PulseAudio Marge Bot
parent ac33a01f30
commit 9699511215
3 changed files with 34 additions and 0 deletions
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28
src/modules/bluetooth/module-bluez5-device.c
View file

@ -66,6 +66,8 @@ PA_MODULE_USAGE("path=<device object path>"
#define HSP_MAX_GAIN 15
#define DEFAULT_OUTPUT_RATE_REFRESH_INTERVAL_MS 500
static const char* const valid_modargs[] = {
"path",
"autodetect_mtu",
@ -1362,6 +1364,8 @@ static void thread_func(void *userdata) {
struct userdata *u = userdata;
unsigned blocks_to_write = 0;
unsigned bytes_to_write = 0;
struct timeval tv_last_output_rate_change;
pa_usec_t ts_elapsed;
pa_assert(u);
pa_assert(u->transport);
@ -1377,6 +1381,8 @@ static void thread_func(void *userdata) {
if (u->transport_acquired)
setup_stream(u);
pa_gettimeofday(&tv_last_output_rate_change);
for (;;) {
struct pollfd *pollfd;
int ret;
@ -1525,6 +1531,7 @@ static void thread_func(void *userdata) {
u->write_block_size = new_write_block_size;
handle_sink_block_size_change(u);
}
pa_gettimeofday(&tv_last_output_rate_change);
}
}
@ -1557,6 +1564,19 @@ static void thread_func(void *userdata) {
next_write_at = pa_bytes_to_usec(u->write_index, &u->encoder_sample_spec);
sleep_for = time_passed < next_write_at ? next_write_at - time_passed : 0;
/* pa_log("Sleeping for %lu; time passed %lu, next write at %lu", (unsigned long) sleep_for, (unsigned long) time_passed, (unsigned long)next_write_at); */
if (u->profile == PA_BLUETOOTH_PROFILE_A2DP_SINK && u->write_memchunk.memblock == NULL) {
/* write_block() is keeping up with input, try increasing bitrate */
if (u->a2dp_codec->increase_encoder_bitrate
&& pa_timeval_age(&tv_last_output_rate_change) >= u->device->output_rate_refresh_interval_ms * PA_USEC_PER_MSEC) {
size_t new_write_block_size = u->a2dp_codec->increase_encoder_bitrate(u->encoder_info, u->write_link_mtu);
if (new_write_block_size) {
u->write_block_size = new_write_block_size;
handle_sink_block_size_change(u);
}
pa_gettimeofday(&tv_last_output_rate_change);
}
}
} else
/* We could not write because the stream was not ready. Let's try
* again in 500 ms and drop audio if we still can't write. The
@ -2488,6 +2508,7 @@ int pa__init(pa_module* m) {
pa_modargs *ma;
bool autodetect_mtu;
char *message_handler_path;
uint32_t output_rate_refresh_interval_ms = DEFAULT_OUTPUT_RATE_REFRESH_INTERVAL_MS;
pa_assert(m);
@ -2526,6 +2547,13 @@ int pa__init(pa_module* m) {
u->device->autodetect_mtu = autodetect_mtu;
if (pa_modargs_get_value_u32(ma, "output-rate-refresh-interval-ms", &output_rate_refresh_interval_ms) < 0) {
pa_log("Invalid output_rate_refresh_interval.");
goto fail_free_modargs;
}
u->device->output_rate_refresh_interval_ms = output_rate_refresh_interval_ms;
pa_modargs_free(ma);
u->device_connection_changed_slot =