C++ (Cpp) pa_sink_input_set_rate Examples

Example #1

File: module-loopback.c Project: freedesktop-unofficial-mirror/pulseaudio__pulseaudio.git.backup

/* Called from main context */
static void adjust_rates(struct userdata *u) {
    size_t buffer, fs;
    uint32_t old_rate, base_rate, new_rate;
    pa_usec_t buffer_latency;

    pa_assert(u);
    pa_assert_ctl_context();

    pa_asyncmsgq_send(u->source_output->source->asyncmsgq, PA_MSGOBJECT(u->source_output), SOURCE_OUTPUT_MESSAGE_LATENCY_SNAPSHOT, NULL, 0, NULL);
    pa_asyncmsgq_send(u->sink_input->sink->asyncmsgq, PA_MSGOBJECT(u->sink_input), SINK_INPUT_MESSAGE_LATENCY_SNAPSHOT, NULL, 0, NULL);

    buffer =
        u->latency_snapshot.sink_input_buffer +
        u->latency_snapshot.source_output_buffer;

    if (u->latency_snapshot.recv_counter <= u->latency_snapshot.send_counter)
        buffer += (size_t) (u->latency_snapshot.send_counter - u->latency_snapshot.recv_counter);
    else
        buffer += PA_CLIP_SUB(buffer, (size_t) (u->latency_snapshot.recv_counter - u->latency_snapshot.send_counter));

    buffer_latency = pa_bytes_to_usec(buffer, &u->sink_input->sample_spec);

    pa_log_debug("Loopback overall latency is %0.2f ms + %0.2f ms + %0.2f ms = %0.2f ms",
                (double) u->latency_snapshot.sink_latency / PA_USEC_PER_MSEC,
                (double) buffer_latency / PA_USEC_PER_MSEC,
                (double) u->latency_snapshot.source_latency / PA_USEC_PER_MSEC,
                ((double) u->latency_snapshot.sink_latency + buffer_latency + u->latency_snapshot.source_latency) / PA_USEC_PER_MSEC);

    pa_log_debug("Should buffer %zu bytes, buffered at minimum %zu bytes",
                u->latency_snapshot.max_request*2,
                u->latency_snapshot.min_memblockq_length);

    fs = pa_frame_size(&u->sink_input->sample_spec);
    old_rate = u->sink_input->sample_spec.rate;
    base_rate = u->source_output->sample_spec.rate;

    if (u->latency_snapshot.min_memblockq_length < u->latency_snapshot.max_request*2)
        new_rate = base_rate - (((u->latency_snapshot.max_request*2 - u->latency_snapshot.min_memblockq_length) / fs) *PA_USEC_PER_SEC)/u->adjust_time;
    else
        new_rate = base_rate + (((u->latency_snapshot.min_memblockq_length - u->latency_snapshot.max_request*2) / fs) *PA_USEC_PER_SEC)/u->adjust_time;

    if (new_rate < (uint32_t) (base_rate*0.8) || new_rate > (uint32_t) (base_rate*1.25)) {
        pa_log_warn("Sample rates too different, not adjusting (%u vs. %u).", base_rate, new_rate);
        new_rate = base_rate;
    } else {
        if (base_rate < new_rate + 20 && new_rate < base_rate + 20)
          new_rate = base_rate;
        /* Do the adjustment in small steps; 2‰ can be considered inaudible */
        if (new_rate < (uint32_t) (old_rate*0.998) || new_rate > (uint32_t) (old_rate*1.002)) {
            pa_log_info("New rate of %u Hz not within 2‰ of %u Hz, forcing smaller adjustment", new_rate, old_rate);
            new_rate = PA_CLAMP(new_rate, (uint32_t) (old_rate*0.998), (uint32_t) (old_rate*1.002));
        }
    }

    pa_sink_input_set_rate(u->sink_input, new_rate);
    pa_log_debug("[%s] Updated sampling rate to %lu Hz.", u->sink_input->sink->name, (unsigned long) new_rate);

    pa_core_rttime_restart(u->core, u->time_event, pa_rtclock_now() + u->adjust_time);
}

Example #2

File: module-loopback.c Project: ford-prefect/pulseaudio

/* Called from main context */
static void adjust_rates(struct userdata *u) {
    size_t buffer;
    uint32_t old_rate, base_rate, new_rate;
    int32_t latency_difference;
    pa_usec_t current_buffer_latency, snapshot_delay, current_source_sink_latency, current_latency, latency_at_optimum_rate;
    pa_usec_t final_latency;

    pa_assert(u);
    pa_assert_ctl_context();

    /* Rates and latencies*/
    old_rate = u->sink_input->sample_spec.rate;
    base_rate = u->source_output->sample_spec.rate;

    buffer = u->latency_snapshot.sink_input_buffer;
    if (u->latency_snapshot.recv_counter <= u->latency_snapshot.send_counter)
        buffer += (size_t) (u->latency_snapshot.send_counter - u->latency_snapshot.recv_counter);
    else
        buffer = PA_CLIP_SUB(buffer, (size_t) (u->latency_snapshot.recv_counter - u->latency_snapshot.send_counter));

    current_buffer_latency = pa_bytes_to_usec(buffer, &u->sink_input->sample_spec);
    snapshot_delay = u->latency_snapshot.source_timestamp - u->latency_snapshot.sink_timestamp;
    current_source_sink_latency = u->latency_snapshot.sink_latency + u->latency_snapshot.source_latency - snapshot_delay;

    /* Current latency */
    current_latency = current_source_sink_latency + current_buffer_latency;

    /* Latency at base rate */
    latency_at_optimum_rate = current_source_sink_latency + current_buffer_latency * old_rate / base_rate;

    final_latency = u->latency;
    latency_difference = (int32_t)((int64_t)latency_at_optimum_rate - final_latency);

    pa_log_debug("Loopback overall latency is %0.2f ms + %0.2f ms + %0.2f ms = %0.2f ms",
                (double) u->latency_snapshot.sink_latency / PA_USEC_PER_MSEC,
                (double) current_buffer_latency / PA_USEC_PER_MSEC,
                (double) u->latency_snapshot.source_latency / PA_USEC_PER_MSEC,
                (double) current_latency / PA_USEC_PER_MSEC);

    pa_log_debug("Loopback latency at base rate is %0.2f ms", (double)latency_at_optimum_rate / PA_USEC_PER_MSEC);

    /* Calculate new rate */
    new_rate = rate_controller(base_rate, u->adjust_time, latency_difference);

    /* Set rate */
    pa_sink_input_set_rate(u->sink_input, new_rate);
    pa_log_debug("[%s] Updated sampling rate to %lu Hz.", u->sink_input->sink->name, (unsigned long) new_rate);
}

Example #3

File: module-loopback.c Project: KimT/pulseaudio_kt

/* Called from main context */
static void adjust_rates(struct userdata *u) {
    size_t buffer, fs;
    uint32_t old_rate, base_rate, new_rate;
    pa_usec_t buffer_latency;

    pa_assert(u);
    pa_assert_ctl_context();

    pa_asyncmsgq_send(u->source_output->source->asyncmsgq, PA_MSGOBJECT(u->source_output), SOURCE_OUTPUT_MESSAGE_LATENCY_SNAPSHOT, NULL, 0, NULL);
    pa_asyncmsgq_send(u->sink_input->sink->asyncmsgq, PA_MSGOBJECT(u->sink_input), SINK_INPUT_MESSAGE_LATENCY_SNAPSHOT, NULL, 0, NULL);

    buffer =
        u->latency_snapshot.sink_input_buffer +
        u->latency_snapshot.source_output_buffer;

    if (u->latency_snapshot.recv_counter <= u->latency_snapshot.send_counter)
        buffer += (size_t) (u->latency_snapshot.send_counter - u->latency_snapshot.recv_counter);
    else
        buffer += PA_CLIP_SUB(buffer, (size_t) (u->latency_snapshot.recv_counter - u->latency_snapshot.send_counter));

    buffer_latency = pa_bytes_to_usec(buffer, &u->sink_input->sample_spec);

    pa_log_info("Loopback overall latency is %0.2f ms + %0.2f ms + %0.2f ms = %0.2f ms",
                (double) u->latency_snapshot.sink_latency / PA_USEC_PER_MSEC,
                (double) buffer_latency / PA_USEC_PER_MSEC,
                (double) u->latency_snapshot.source_latency / PA_USEC_PER_MSEC,
                ((double) u->latency_snapshot.sink_latency + buffer_latency + u->latency_snapshot.source_latency) / PA_USEC_PER_MSEC);

    pa_log_info("Should buffer %zu bytes, buffered at minimum %zu bytes",
                u->latency_snapshot.max_request*2,
                u->latency_snapshot.min_memblockq_length);

    fs = pa_frame_size(&u->sink_input->sample_spec);
    old_rate = u->sink_input->sample_spec.rate;
    base_rate = u->source_output->sample_spec.rate;

    if (u->latency_snapshot.min_memblockq_length < u->latency_snapshot.max_request*2)
        new_rate = base_rate - (((u->latency_snapshot.max_request*2 - u->latency_snapshot.min_memblockq_length) / fs) *PA_USEC_PER_SEC)/u->adjust_time;
    else
        new_rate = base_rate + (((u->latency_snapshot.min_memblockq_length - u->latency_snapshot.max_request*2) / fs) *PA_USEC_PER_SEC)/u->adjust_time;

    pa_log_info("Old rate %lu Hz, new rate %lu Hz", (unsigned long) old_rate, (unsigned long) new_rate);

    pa_sink_input_set_rate(u->sink_input, new_rate);

    pa_core_rttime_restart(u->core, u->time_event, pa_rtclock_now() + u->adjust_time);
}