mirror of
https://github.com/libretro/RetroArch.git
synced 2024-10-09 07:33:36 +00:00
287 lines
7.5 KiB
C
287 lines
7.5 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "../driver.h"
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#include <stdlib.h>
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#include <alsa/asoundlib.h>
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#include "../general.h"
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#define TRY_ALSA(x) if (x < 0) { \
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goto error; \
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}
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typedef struct alsa
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{
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snd_pcm_t *pcm;
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size_t buffer_size;
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bool nonblock;
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bool has_float;
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bool can_pause;
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bool is_paused;
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} alsa_t;
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static bool alsa_use_float(void *data)
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{
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alsa_t *alsa = (alsa_t*)data;
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return alsa->has_float;
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}
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static bool find_float_format(snd_pcm_t *pcm, void *data)
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{
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snd_pcm_hw_params_t *params = (snd_pcm_hw_params_t*)data;
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if (snd_pcm_hw_params_test_format(pcm, params, SND_PCM_FORMAT_FLOAT) == 0)
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{
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RARCH_LOG("ALSA: Using floating point format.\n");
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return true;
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}
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RARCH_LOG("ALSA: Using signed 16-bit format.\n");
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return false;
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}
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static void *alsa_init(const char *device, unsigned rate, unsigned latency)
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{
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alsa_t *alsa = (alsa_t*)calloc(1, sizeof(alsa_t));
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if (!alsa)
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return NULL;
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snd_pcm_hw_params_t *params = NULL;
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snd_pcm_sw_params_t *sw_params = NULL;
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unsigned latency_usec = latency * 1000;
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unsigned channels = 2;
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unsigned periods = 4;
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snd_pcm_format_t format;
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const char *alsa_dev = "default";
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if (device)
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alsa_dev = device;
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snd_pcm_uframes_t buffer_size;
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TRY_ALSA(snd_pcm_open(&alsa->pcm, alsa_dev, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK));
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TRY_ALSA(snd_pcm_hw_params_malloc(¶ms));
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alsa->has_float = find_float_format(alsa->pcm, params);
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format = alsa->has_float ? SND_PCM_FORMAT_FLOAT : SND_PCM_FORMAT_S16;
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TRY_ALSA(snd_pcm_hw_params_any(alsa->pcm, params));
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TRY_ALSA(snd_pcm_hw_params_set_access(alsa->pcm, params, SND_PCM_ACCESS_RW_INTERLEAVED));
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TRY_ALSA(snd_pcm_hw_params_set_format(alsa->pcm, params, format));
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TRY_ALSA(snd_pcm_hw_params_set_channels(alsa->pcm, params, channels));
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TRY_ALSA(snd_pcm_hw_params_set_rate(alsa->pcm, params, rate, 0));
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TRY_ALSA(snd_pcm_hw_params_set_buffer_time_near(alsa->pcm, params, &latency_usec, NULL));
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TRY_ALSA(snd_pcm_hw_params_set_periods_near(alsa->pcm, params, &periods, NULL));
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TRY_ALSA(snd_pcm_hw_params(alsa->pcm, params));
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snd_pcm_hw_params_get_period_size(params, &buffer_size, NULL);
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RARCH_LOG("ALSA: Period size: %d frames\n", (int)buffer_size);
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snd_pcm_hw_params_get_buffer_size(params, &buffer_size);
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RARCH_LOG("ALSA: Buffer size: %d frames\n", (int)buffer_size);
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alsa->buffer_size = snd_pcm_frames_to_bytes(alsa->pcm, buffer_size);
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alsa->can_pause = snd_pcm_hw_params_can_pause(params);
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RARCH_LOG("ALSA: Can pause: %s.\n", alsa->can_pause ? "yes" : "no");
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TRY_ALSA(snd_pcm_sw_params_malloc(&sw_params));
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TRY_ALSA(snd_pcm_sw_params_current(alsa->pcm, sw_params));
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TRY_ALSA(snd_pcm_sw_params_set_start_threshold(alsa->pcm, sw_params, buffer_size / 2));
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TRY_ALSA(snd_pcm_sw_params(alsa->pcm, sw_params));
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snd_pcm_hw_params_free(params);
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snd_pcm_sw_params_free(sw_params);
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return alsa;
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error:
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RARCH_ERR("ALSA: Failed to initialize...\n");
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if (params)
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snd_pcm_hw_params_free(params);
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if (sw_params)
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snd_pcm_sw_params_free(sw_params);
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if (alsa)
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{
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if (alsa->pcm)
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snd_pcm_close(alsa->pcm);
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free(alsa);
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}
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return NULL;
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}
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static ssize_t alsa_write(void *data, const void *buf_, size_t size_)
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{
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alsa_t *alsa = (alsa_t*)data;
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const uint8_t *buf = (const uint8_t*)buf_;
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bool eagain_retry = true;
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snd_pcm_sframes_t written = 0;
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snd_pcm_sframes_t size = snd_pcm_bytes_to_frames(alsa->pcm, size_);
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while (size)
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{
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if (!alsa->nonblock)
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{
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int rc = snd_pcm_wait(alsa->pcm, -1);
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if (rc == -EPIPE || rc == -ESTRPIPE || rc == -EINTR)
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{
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if (snd_pcm_recover(alsa->pcm, rc, 1) < 0)
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{
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RARCH_ERR("[ALSA]: (#1) Failed to recover from error (%s)\n",
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snd_strerror(rc));
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return -1;
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}
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continue;
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}
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}
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snd_pcm_sframes_t frames = snd_pcm_writei(alsa->pcm, buf, size);
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if (frames == -EPIPE || frames == -EINTR || frames == -ESTRPIPE)
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{
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if (snd_pcm_recover(alsa->pcm, frames, 1) < 0)
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{
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RARCH_ERR("[ALSA]: (#2) Failed to recover from error (%s)\n",
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snd_strerror(frames));
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return -1;
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}
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break;
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}
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else if (frames == -EAGAIN && !alsa->nonblock) // Definitely not supposed to happen.
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{
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RARCH_WARN("[ALSA]: poll() was signaled, but EAGAIN returned from write.\n"
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"Your ALSA driver might be subtly broken.\n");
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if (eagain_retry)
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{
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eagain_retry = false;
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continue;
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}
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else
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return written;
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}
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else if (frames == -EAGAIN) // Expected if we're running nonblock.
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{
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return written;
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}
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else if (frames < 0)
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{
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RARCH_ERR("[ALSA]: Unknown error occured (%s).\n", snd_strerror(frames));
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return -1;
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}
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written += frames;
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buf += (frames << 1) * (alsa->has_float ? sizeof(float) : sizeof(int16_t));
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size -= frames;
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}
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return written;
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}
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static bool alsa_stop(void *data)
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{
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alsa_t *alsa = (alsa_t*)data;
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if (alsa->can_pause && !alsa->is_paused)
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{
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if (snd_pcm_pause(alsa->pcm, 1) == 0)
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{
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alsa->is_paused = true;
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return true;
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}
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else
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return false;
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}
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else
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return true;
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}
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static void alsa_set_nonblock_state(void *data, bool state)
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{
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alsa_t *alsa = (alsa_t*)data;
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alsa->nonblock = state;
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}
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static bool alsa_start(void *data)
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{
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alsa_t *alsa = (alsa_t*)data;
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if (alsa->can_pause && alsa->is_paused)
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{
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int ret = snd_pcm_pause(alsa->pcm, 0);
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if (ret < 0)
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{
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RARCH_ERR("[ALSA]: Failed to unpause: %s.\n", snd_strerror(ret));
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return false;
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}
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else
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{
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alsa->is_paused = false;
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return true;
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}
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}
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else
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return true;
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}
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static void alsa_free(void *data)
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{
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alsa_t *alsa = (alsa_t*)data;
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if (alsa)
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{
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if (alsa->pcm)
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{
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snd_pcm_drop(alsa->pcm);
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snd_pcm_close(alsa->pcm);
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}
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free(alsa);
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}
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}
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static size_t alsa_write_avail(void *data)
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{
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alsa_t *alsa = (alsa_t*)data;
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snd_pcm_sframes_t avail = snd_pcm_avail(alsa->pcm);
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if (avail < 0)
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{
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//RARCH_WARN("[ALSA]: snd_pcm_avail() failed: %s\n", snd_strerror(avail));
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return alsa->buffer_size;
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}
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return snd_pcm_frames_to_bytes(alsa->pcm, avail);
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}
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static size_t alsa_buffer_size(void *data)
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{
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alsa_t *alsa = (alsa_t*)data;
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return alsa->buffer_size;
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}
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const audio_driver_t audio_alsa = {
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alsa_init,
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alsa_write,
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alsa_stop,
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alsa_start,
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alsa_set_nonblock_state,
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alsa_free,
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alsa_use_float,
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"alsa",
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alsa_write_avail,
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alsa_buffer_size,
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};
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