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/*
* Copyright (C) 2024 Mikhail Burakov. This file is part of receiver.
*
* receiver is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* receiver is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with receiver. If not, see <https://www.gnu.org/licenses/>.
*/
#include "audio.h"
#include <errno.h>
#include <pipewire/pipewire.h>
#include <spa/param/audio/raw-utils.h>
#include <spa/utils/result.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "atomic_queue.h"
#include "toolbox/utils.h"
struct AudioContext {
struct AtomicQueue queue;
struct pw_thread_loop* pw_thread_loop;
struct pw_stream* pw_stream;
size_t queue_samples_sum;
size_t queue_samples_count;
};
static void OnStreamProcess(void* data) {
struct AudioContext* audio_context = data;
struct pw_buffer* pw_buffer =
pw_stream_dequeue_buffer(audio_context->pw_stream);
if (!pw_buffer) {
LOG("Failed to dequeue stream buffer");
return;
}
static const size_t stride = sizeof(int16_t) * 2;
struct spa_data* spa_data = &pw_buffer->buffer->datas[0];
size_t requested =
MIN(pw_buffer->requested, spa_data->maxsize / stride) * stride;
size_t available =
AtomicQueueRead(&audio_context->queue, spa_data->data, requested);
if (available < requested) {
// LOG("Audio queue underflow (%zu < %zu)!", available, requested);
memset((uint8_t*)spa_data->data + available, 0, requested - available);
}
spa_data->chunk->offset = 0;
spa_data->chunk->stride = stride;
spa_data->chunk->size = (uint32_t)requested;
pw_stream_queue_buffer(audio_context->pw_stream, pw_buffer);
return;
}
struct AudioContext* AudioContextCreate(size_t queue_size) {
pw_init(0, NULL);
struct AudioContext* audio_context = malloc(sizeof(struct AudioContext));
if (!audio_context) {
LOG("Failed to allocate audio context (%s)", strerror(errno));
return NULL;
}
if (!AtomicQueueCreate(&audio_context->queue,
queue_size * sizeof(int16_t) * 2)) {
LOG("Failed to create buffer queue (%s)", strerror(errno));
goto rollback_audio_context;
}
audio_context->pw_thread_loop = pw_thread_loop_new("audio-playback", NULL);
if (!audio_context->pw_thread_loop) {
LOG("Failed to create pipewire thread loop");
goto rollback_queue;
}
pw_thread_loop_lock(audio_context->pw_thread_loop);
int err = pw_thread_loop_start(audio_context->pw_thread_loop);
if (err) {
LOG("Failed to start pipewire thread loop (%s)", spa_strerror(err));
pw_thread_loop_unlock(audio_context->pw_thread_loop);
goto rollback_thread_loop;
}
// TOOD(mburakov): Read these from the commandline?
struct pw_properties* pw_properties = pw_properties_new(
#define _(...) __VA_ARGS__
_(PW_KEY_MEDIA_TYPE, "Audio"), _(PW_KEY_MEDIA_CATEGORY, "Playback"),
_(PW_KEY_MEDIA_ROLE, "Game"), _(PW_KEY_NODE_LATENCY, "128/48000"), NULL
#undef _
);
if (!pw_properties) {
LOG("Failed to create pipewire properties");
pw_thread_loop_unlock(audio_context->pw_thread_loop);
goto rollback_thread_loop;
}
static const struct pw_stream_events kPwStreamEvents = {
.version = PW_VERSION_STREAM_EVENTS,
.process = OnStreamProcess,
};
audio_context->pw_stream = pw_stream_new_simple(
pw_thread_loop_get_loop(audio_context->pw_thread_loop), "audio-playback",
pw_properties, &kPwStreamEvents, audio_context);
if (!audio_context->pw_stream) {
LOG("Failed to create pipewire stream");
pw_thread_loop_unlock(audio_context->pw_thread_loop);
goto rollback_thread_loop;
}
uint8_t buffer[1024];
struct spa_pod_builder spa_pod_builder =
SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
const struct spa_pod* params[] = {
spa_format_audio_raw_build(
&spa_pod_builder, SPA_PARAM_EnumFormat,
&SPA_AUDIO_INFO_RAW_INIT(.format = SPA_AUDIO_FORMAT_S16_LE,
.rate = 48000, .channels = 2,
.position = {SPA_AUDIO_CHANNEL_FL,
SPA_AUDIO_CHANNEL_FR})),
};
static const enum pw_stream_flags kPwStreamFlags =
PW_STREAM_FLAG_AUTOCONNECT | PW_STREAM_FLAG_MAP_BUFFERS |
PW_STREAM_FLAG_RT_PROCESS;
if (pw_stream_connect(audio_context->pw_stream, PW_DIRECTION_OUTPUT,
PW_ID_ANY, kPwStreamFlags, params, LENGTH(params))) {
LOG("Failed to connect pipewire stream");
pw_stream_destroy(audio_context->pw_stream);
pw_thread_loop_unlock(audio_context->pw_thread_loop);
goto rollback_thread_loop;
}
audio_context->queue_samples_sum = 0;
audio_context->queue_samples_count = 0;
pw_thread_loop_unlock(audio_context->pw_thread_loop);
return audio_context;
rollback_thread_loop:
pw_thread_loop_destroy(audio_context->pw_thread_loop);
rollback_queue:
AtomicQueueDestroy(&audio_context->queue);
rollback_audio_context:
free(audio_context);
pw_deinit();
return NULL;
}
bool AudioContextDecode(struct AudioContext* audio_context, const void* buffer,
size_t size) {
if (AtomicQueueWrite(&audio_context->queue, buffer, size) < size)
LOG("Audio queue overflow!");
size_t queue_size =
atomic_load_explicit(&audio_context->queue.size, memory_order_relaxed);
static const size_t stride = sizeof(int16_t) * 2;
audio_context->queue_samples_sum += queue_size / stride;
audio_context->queue_samples_count++;
return true;
}
uint64_t AudioContextGetLatency(struct AudioContext* audio_context) {
size_t queue_latency = 0;
if (audio_context->queue_samples_count) {
queue_latency =
audio_context->queue_samples_sum / audio_context->queue_samples_count;
audio_context->queue_samples_sum = 0;
audio_context->queue_samples_count = 0;
}
// TODO(mburakov): This number is extremely optimistic, i.e. Bluetooth delays
// are not accounted for. Is it anyhow possible to get this information?
return (128 + queue_latency) * 1000000 / 48000;
}
void AudioContextDestroy(struct AudioContext* audio_context) {
pw_thread_loop_lock(audio_context->pw_thread_loop);
pw_stream_destroy(audio_context->pw_stream);
pw_thread_loop_unlock(audio_context->pw_thread_loop);
pw_thread_loop_destroy(audio_context->pw_thread_loop);
AtomicQueueDestroy(&audio_context->queue);
free(audio_context);
pw_deinit();
}
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