mirror of
https://github.com/libretro/RetroArch
synced 2024-12-29 12:31:05 +00:00
385 lines
9.6 KiB
C
385 lines
9.6 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
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* Copyright (C) 2011-2016 - Daniel De Matteis
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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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#define ALSA_PCM_NEW_HW_PARAMS_API
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#define ALSA_PCM_NEW_SW_PARAMS_API
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#include <sys/asoundlib.h>
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#include "../audio_driver.h"
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#include "../../configuration.h"
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#define MAX_FRAG_SIZE 3072
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#define DEFAULT_RATE 48000
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#define CHANNELS 2
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typedef struct alsa
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{
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uint8_t **buffer;
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uint8_t *buffer_chunk;
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unsigned buffer_index;
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unsigned buffer_ptr;
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volatile unsigned buffered_blocks;
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snd_pcm_t *pcm;
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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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unsigned buf_size;
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unsigned buf_count;
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} alsa_t;
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typedef long snd_pcm_sframes_t;
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static void *alsa_qsa_init(const char *device,
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unsigned rate, unsigned latency)
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{
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int err, card, dev, i;
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snd_pcm_channel_params_t params = {0};
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snd_pcm_channel_info_t pi;
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snd_pcm_channel_setup_t setup = {0};
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settings_t *settings = config_get_ptr();
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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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(void)device;
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(void)rate;
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(void)latency;
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if ((err = snd_pcm_open_preferred(&alsa->pcm, &card, &dev,
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SND_PCM_OPEN_PLAYBACK)) < 0)
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{
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RARCH_ERR("[ALSA QSA]: Audio open error: %s\n",
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snd_strerror(err));
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goto error;
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}
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if((err = snd_pcm_nonblock_mode(alsa->pcm, 1)) < 0)
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{
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RARCH_ERR("[ALSA QSA]: Can't set blocking mode: %s\n",
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snd_strerror(err));
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goto error;
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}
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memset(&pi, 0, sizeof(pi));
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pi.channel = SND_PCM_CHANNEL_PLAYBACK;
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if ((err = snd_pcm_channel_info(alsa->pcm, &pi)) < 0)
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{
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RARCH_ERR("[ALSA QSA]: snd_pcm_channel_info failed: %s\n",
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snd_strerror(err));
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goto error;
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}
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memset(¶ms, 0, sizeof(params));
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params.channel = SND_PCM_CHANNEL_PLAYBACK;
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params.mode = SND_PCM_MODE_BLOCK;
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params.format.interleave = 1;
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params.format.format = SND_PCM_SFMT_S16_LE;
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params.format.rate = DEFAULT_RATE;
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params.format.voices = 2;
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params.start_mode = SND_PCM_START_FULL;
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params.stop_mode = SND_PCM_STOP_STOP;
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params.buf.block.frag_size = pi.max_fragment_size;
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params.buf.block.frags_min = 2;
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params.buf.block.frags_max = 8;
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RARCH_LOG("Fragment size: %d\n", params.buf.block.frag_size);
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RARCH_LOG("Min Fragment size: %d\n", params.buf.block.frags_min);
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RARCH_LOG("Max Fragment size: %d\n", params.buf.block.frags_max);
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if ((err = snd_pcm_channel_params(alsa->pcm, ¶ms)) < 0)
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{
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RARCH_ERR("[ALSA QSA]: Channel Parameter Error: %s\n",
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snd_strerror(err));
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goto error;
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}
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setup.channel = SND_PCM_CHANNEL_PLAYBACK;
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if ((err = snd_pcm_channel_setup(alsa->pcm, &setup)) < 0)
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{
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RARCH_ERR("[ALSA QSA]: Channel Parameter Read Back Error: %s\n",
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snd_strerror(err));
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goto error;
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}
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if (settings->audio.block_frames)
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alsa->buf_size = settings->audio.block_frames * 4;
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else
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alsa->buf_size = next_pow2(32 * latency);
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RARCH_LOG("[ALSA QSA]: buffer size: %u bytes\n", alsa->buf_size);
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alsa->buf_count = (latency * 4 * rate + 500) / 1000;
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alsa->buf_count = (alsa->buf_count + alsa->buf_size / 2) / alsa->buf_size;
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if ((err = snd_pcm_channel_prepare(alsa->pcm,
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SND_PCM_CHANNEL_PLAYBACK)) < 0)
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{
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RARCH_ERR("[ALSA QSA]: Channel Prepare Error: %s\n",
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snd_strerror(err));
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goto error;
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}
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alsa->buffer = (uint8_t**)calloc(sizeof(uint8_t*), alsa->buf_count);
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if (!alsa->buffer)
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goto error;
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alsa->buffer_chunk = (uint8_t*)calloc(alsa->buf_count, alsa->buf_size);
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if (!alsa->buffer_chunk)
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goto error;
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for (i = 0; i < alsa->buf_count; i++)
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alsa->buffer[i] = alsa->buffer_chunk + i * alsa->buf_size;
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alsa->has_float = false;
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alsa->can_pause = true;
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RARCH_LOG("[ALSA QSA]: Can pause: %s.\n",
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alsa->can_pause ? "yes" : "no");
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return alsa;
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error:
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return (void*)-1;
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}
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static int check_pcm_status(void *data, int channel_type)
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{
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alsa_t *alsa = (alsa_t*)data;
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snd_pcm_channel_status_t status;
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int ret = EOK;
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memset(&status, 0, sizeof (status));
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status.channel = channel_type;
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if ((ret = snd_pcm_channel_status(alsa->pcm, &status)) == 0)
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{
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if (status.status == SND_PCM_STATUS_UNSECURE)
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{
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RARCH_ERR("check_pcm_status got SND_PCM_STATUS_UNSECURE, aborting playback\n");
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ret = -EPROTO;
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}
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else if (status.status == SND_PCM_STATUS_UNDERRUN)
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{
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RARCH_LOG("check_pcm_status: SNDP_CM_STATUS_UNDERRUN.\n");
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if ((ret = snd_pcm_channel_prepare(alsa->pcm, channel_type)) < 0)
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{
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RARCH_ERR("Invalid state detected for underrun on snd_pcm_channel_prepare: %s\n",
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snd_strerror(ret));
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ret = -EPROTO;
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}
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}
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else if (status.status == SND_PCM_STATUS_OVERRUN)
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{
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RARCH_LOG("check_pcm_status: SNDP_CM_STATUS_OVERRUN.\n");
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if ((ret = snd_pcm_channel_prepare(alsa->pcm, channel_type)) < 0)
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{
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RARCH_ERR("Invalid state detected for overrun on snd_pcm_channel_prepare: %s\n",
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snd_strerror(ret));
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ret = -EPROTO;
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}
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}
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else if (status.status == SND_PCM_STATUS_CHANGE)
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{
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RARCH_LOG("check_pcm_status: SNDP_CM_STATUS_CHANGE.\n");
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if ((ret = snd_pcm_channel_prepare(alsa->pcm, channel_type)) < 0)
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{
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RARCH_ERR("Invalid state detected for change on snd_pcm_channel_prepare: %s\n",
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snd_strerror(ret));
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ret = -EPROTO;
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}
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}
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}
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else
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{
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RARCH_ERR("check_pcm_status failed: %s\n", snd_strerror(ret));
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if (ret == -ESRCH)
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ret = -EBADF;
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}
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return ret;
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}
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static ssize_t alsa_qsa_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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snd_pcm_sframes_t written = 0;
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while (size)
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{
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size_t avail_write = MIN(alsa->buf_size - alsa->buffer_ptr, size);
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if (avail_write)
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{
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memcpy(alsa->buffer[alsa->buffer_index] +
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alsa->buffer_ptr, buf, avail_write);
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alsa->buffer_ptr += avail_write;
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buf = (void*)((uint8_t*)buf + avail_write);
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size -= avail_write;
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written += avail_write;
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}
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if (alsa->buffer_ptr >= alsa->buf_size)
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{
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snd_pcm_sframes_t frames = snd_pcm_write(alsa->pcm,
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alsa->buffer[alsa->buffer_index], alsa->buf_size);
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alsa->buffer_index = (alsa->buffer_index + 1) % alsa->buf_count;
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alsa->buffer_ptr = 0;
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if (frames <= 0)
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{
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int ret;
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if (frames == -EAGAIN)
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continue;
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ret = check_pcm_status(alsa, SND_PCM_CHANNEL_PLAYBACK);
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if (ret == -EPROTO || ret == -EBADF)
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return -1;
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}
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}
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}
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return written;
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}
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static bool alsa_qsa_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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int ret = snd_pcm_playback_pause(alsa->pcm);
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if (ret < 0)
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return false;
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alsa->is_paused = true;
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}
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return true;
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}
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static bool alsa_qsa_alive(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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return !alsa->is_paused;
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return false;
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}
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static bool alsa_qsa_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_playback_resume(alsa->pcm);
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if (ret < 0)
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{
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RARCH_ERR("[ALSA QSA]: Failed to unpause: %s.\n",
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snd_strerror(ret));
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return false;
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}
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alsa->is_paused = false;
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}
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return true;
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}
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static void alsa_qsa_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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int err;
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if((err = snd_pcm_nonblock_mode(alsa->pcm, state)) < 0)
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{
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RARCH_ERR("Can't set blocking mode to %d: %s\n", state,
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snd_strerror(err));
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return;
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}
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alsa->nonblock = state;
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}
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static bool alsa_qsa_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 void alsa_qsa_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_close(alsa->pcm);
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alsa->pcm = NULL;
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}
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free(alsa->buffer);
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free(alsa->buffer_chunk);
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free(alsa);
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}
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}
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static size_t alsa_qsa_write_avail(void *data)
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{
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alsa_t *alsa = (alsa_t*)data;
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size_t avail = (alsa->buf_count -
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(int)alsa->buffered_blocks - 1) * alsa->buf_size +
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(alsa->buf_size - (int)alsa->buffer_ptr);
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return avail;
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}
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static size_t alsa_qsa_buffer_size(void *data)
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{
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alsa_t *alsa = (alsa_t*)data;
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return alsa->buf_size * alsa->buf_count;
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}
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audio_driver_t audio_alsa = {
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alsa_qsa_init,
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alsa_qsa_write,
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alsa_qsa_stop,
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alsa_qsa_start,
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alsa_qsa_alive,
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alsa_qsa_set_nonblock_state,
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alsa_qsa_free,
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alsa_qsa_use_float,
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"alsa",
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NULL,
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NULL,
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alsa_qsa_write_avail,
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alsa_qsa_buffer_size,
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};
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