Loaded and returned audio banks. Let's see if this actually works, though...
This commit is contained in:
MeltyPlayer
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#include "../compat.h"
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#if (defined(__linux__) || defined(__BSD__)) && !defined(TARGET_WEB)
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/*
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Simple sound playback using ALSA API and libasound.
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Dependencies: libasound, alsa
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Build-Dependencies: liasound-dev
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Compile: gcc -lasound -o play sound_playback.c
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Usage: ./play <sample_rate> <channels> < <file>
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Examples:
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./play 44100 2 5 < /dev/urandom
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./play 22050 1 8 < /path/to/file.wav
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Copyright (C) 2009 Alessandro Ghedini <al3xbio@gmail.com>
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--------------------------------------------------------------
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"THE BEER-WARE LICENSE" (Revision 42):
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Alessandro Ghedini wrote this file. As long as you retain this
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notice you can do whatever you want with this stuff. If we
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meet some day, and you think this stuff is worth it, you can
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buy me a beer in return.
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--------------------------------------------------------------
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*/
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#include <fcntl.h>
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#include <unistd.h>
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#include <poll.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netinet/tcp.h>
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#include <time.h>
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#include <alsa/asoundlib.h>
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#include <stdio.h>
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#include "audio_api.h"
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#define PCM_DEVICE "default"
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static snd_pcm_t *pcm_handle;
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static unsigned long int alsa_buffer_size;
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static unsigned long get_time(void) {
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return (unsigned long)ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
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}
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static bool audio_alsa_init(void) {
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int pcm;
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unsigned int tmp;
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unsigned int rate, channels;
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snd_pcm_hw_params_t *params;
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snd_pcm_uframes_t frames;
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rate = 32000;
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channels = 2;
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/* Open the PCM device in playback mode */
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if ((pcm = snd_pcm_open(&pcm_handle, PCM_DEVICE,
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SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
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printf("ERROR: Can't open \"%s\" PCM device. %s\n",
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PCM_DEVICE, snd_strerror(pcm));
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return false;
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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, channels)) < 0)
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printf("ERROR: Can't set channels number. %s\n", snd_strerror(pcm));
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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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alsa_buffer_size = 1600 + 528 + 544; // five audio buffers from the game
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if ((pcm = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, params, &alsa_buffer_size)) < 0)
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printf("ERROR: Can't set buffer size. %s\n", snd_strerror(pcm));
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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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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_rate(params, &tmp, 0);
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printf("rate: %d bps\n", tmp);
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snd_pcm_hw_params_get_buffer_size(params, &alsa_buffer_size);
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printf("buffer size: %lu\n", alsa_buffer_size);
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/* Allocate buffer to hold single period */
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snd_pcm_hw_params_get_period_size(params, &frames, 0);
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printf("frames: %lu\n", frames);
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snd_pcm_hw_params_get_period_time(params, &tmp, NULL);
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printf("time: %d\n", tmp);
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return true;
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}
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static int audio_alsa_buffered(void) {
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if (!pcm_handle) {
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return 0;
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}
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snd_pcm_sframes_t ret = snd_pcm_avail(pcm_handle);
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if (ret < 0) {
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return 0;
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}
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ret = alsa_buffer_size - ret;
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return ret < 0 ? 0 : ret;
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}
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static int audio_alsa_get_desired_buffered(void) {
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return 1100;
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}
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static void audio_alsa_play(const uint8_t* buff, size_t len) {
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if (!pcm_handle) {
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audio_alsa_init();
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}
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//unsigned long t1 = get_time();
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int frames = len / 4;
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int pcm;
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if ((pcm = snd_pcm_writei(pcm_handle, buff, frames)) == -EPIPE) {
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printf("XRUN.\n");
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snd_pcm_prepare(pcm_handle);
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// Add some silence to avoid another XRUN
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char buf[1100 * 4 + len];
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memset(buf, 0, 1100 * 4);
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memcpy(buf + 1100 * 4, buff, len);
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if ((pcm = snd_pcm_writei(pcm_handle, buf, 1100 + frames)) < 0) {
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printf("Failed again %d\n", pcm);
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}
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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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return;
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}
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//fprintf(stderr, "%u ", get_time() - t1);
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}
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struct AudioAPI audio_alsa = {
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audio_alsa_init,
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audio_alsa_buffered,
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audio_alsa_get_desired_buffered,
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audio_alsa_play
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};
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#endif
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