mirror of
https://github.com/sle118/squeezelite-esp32.git
synced 2025-12-11 05:57:05 +03:00
93 lines
3.1 KiB
C++
93 lines
3.1 KiB
C++
#include "ALSAAudioSink.h"
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ALSAAudioSink::ALSAAudioSink() : Task("", 0, 0, 0) {
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/* Open the PCM device in playback mode */
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if (pcm = snd_pcm_open(&pcm_handle, PCM_DEVICE, SND_PCM_STREAM_PLAYBACK, 0) <
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0) {
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printf("ERROR: Can't open \"%s\" PCM device. %s\n", PCM_DEVICE,
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snd_strerror(pcm));
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}
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/* Allocate parameters object and fill it with default values*/
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snd_pcm_hw_params_alloca(¶ms);
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snd_pcm_hw_params_any(pcm_handle, params);
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/* Set parameters */
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if (pcm = snd_pcm_hw_params_set_access(pcm_handle, params,
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SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
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printf("ERROR: Can't set interleaved mode. %s\n", snd_strerror(pcm));
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if (pcm = snd_pcm_hw_params_set_format(pcm_handle, params,
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SND_PCM_FORMAT_S16_LE) < 0)
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printf("ERROR: Can't set format. %s\n", snd_strerror(pcm));
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if (pcm = snd_pcm_hw_params_set_channels(pcm_handle, params, 2) < 0)
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printf("ERROR: Can't set channels number. %s\n", snd_strerror(pcm));
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unsigned int rate = 44100;
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if (pcm = snd_pcm_hw_params_set_rate_near(pcm_handle, params, &rate, 0) < 0)
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printf("ERROR: Can't set rate. %s\n", snd_strerror(pcm));
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unsigned int periodTime = 800;
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int dir = -1;
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snd_pcm_hw_params_set_period_time_near(pcm_handle, params, &periodTime, &dir);
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/* Write parameters */
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if (pcm = snd_pcm_hw_params(pcm_handle, params) < 0)
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printf("ERROR: Can't set harware parameters. %s\n", snd_strerror(pcm));
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/* Resume information */
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printf("PCM name: '%s'\n", snd_pcm_name(pcm_handle));
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printf("PCM state: %s\n", snd_pcm_state_name(snd_pcm_state(pcm_handle)));
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unsigned int tmp;
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snd_pcm_hw_params_get_channels(params, &tmp);
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printf("channels: %i ", tmp);
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if (tmp == 1)
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printf("(mono)\n");
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else if (tmp == 2)
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printf("(stereo)\n");
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snd_pcm_hw_params_get_period_time(params, &tmp, NULL);
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printf("period_time = %d\n", tmp);
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snd_pcm_hw_params_get_period_size(params, &frames, 0);
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this->buff_size = frames * 2 * 2 /* 2 -> sample size */;
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printf("required buff_size: %d\n", buff_size);
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this->startTask();
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}
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ALSAAudioSink::~ALSAAudioSink() {
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snd_pcm_drain(pcm_handle);
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snd_pcm_close(pcm_handle);
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}
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void ALSAAudioSink::runTask() {
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std::unique_ptr<std::vector<uint8_t>> dataPtr;
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while (true) {
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if (!this->ringbuffer.pop(dataPtr)) {
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usleep(100);
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continue;
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}
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if (pcm = snd_pcm_writei(pcm_handle, dataPtr->data(), this->frames) ==
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-EPIPE) {
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snd_pcm_prepare(pcm_handle);
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} else if (pcm < 0) {
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printf("ERROR. Can't write to PCM device. %s\n", snd_strerror(pcm));
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}
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}
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}
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void ALSAAudioSink::feedPCMFrames(const uint8_t* buffer, size_t bytes) {
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buff.insert(buff.end(), buffer, buffer + bytes);
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while (buff.size() > this->buff_size) {
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auto ptr = std::make_unique<std::vector<uint8_t>>(
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this->buff.begin(), this->buff.begin() + this->buff_size);
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this->buff = std::vector<uint8_t>(this->buff.begin() + this->buff_size,
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this->buff.end());
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while (!this->ringbuffer.push(ptr)) {
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usleep(100);
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};
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}
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}
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