mirror of https://github.com/mpv-player/mpv
475 lines
11 KiB
C
475 lines
11 KiB
C
/*
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ao_alsa9 - ALSA-0.9.x output plugin for MPlayer
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(C) Alex Beregszaszi <alex@naxine.org>
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*/
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#include <errno.h>
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#include <sys/asoundlib.h>
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#include "../config.h"
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#include "audio_out.h"
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#include "audio_out_internal.h"
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#include "afmt.h"
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extern int verbose;
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static ao_info_t info =
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{
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"ALSA-0.9.x audio output",
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"alsa9",
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"Alex Beregszaszi <alex@naxine.org>",
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"under developement"
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};
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LIBAO_EXTERN(alsa9)
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/* global variables:
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ao_samplerate
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ao_channels
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ao_format
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ao_bps
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ao_outburst
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ao_buffersize
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*/
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static snd_pcm_t *alsa_handler;
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static snd_pcm_format_t alsa_format;
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static snd_pcm_hw_params_t *alsa_hwparams;
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static snd_pcm_sw_params_t *alsa_swparams;
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static char *alsa_device;
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#define ALSA_DEVICE_SIZE 48
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/* to set/get/query special features/parameters */
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static int control(int cmd, int arg)
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{
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switch(cmd)
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{
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case AOCONTROL_GET_DEVICE:
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return(char *)alsa_device; /* egy kicsit brutalis, dehat :) */
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case AOCONTROL_SET_DEVICE:
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strncpy(alsa_device, (char *)arg, ALSA_DEVICE_SIZE);
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break;
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}
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return(CONTROL_UNKNOWN);
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}
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/*
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open & setup audio device
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return: 1=success 0=fail
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*/
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static int init(int rate_hz, int channels, int format, int flags)
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{
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int err;
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int cards = -1;
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snd_pcm_info_t *alsa_info;
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int chunck_size;
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printf("alsa-init: requested format: %d Hz, %d channels, %s\n", rate_hz,
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channels, audio_out_format_name(format));
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alsa_handler = NULL;
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if (verbose)
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printf("alsa-init: compiled for ALSA-%s (%d)\n", SND_LIB_VERSION_STR,
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SND_LIB_VERSION);
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if ((err = snd_card_next(&cards)) < 0 || cards < 0)
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{
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printf("alsa-init: no soundcards found: %s\n", snd_strerror(err));
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return(0);
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}
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ao_format = format;
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ao_channels = channels - 1;
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ao_samplerate = rate_hz;
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ao_bps = ao_samplerate*(ao_channels+1);
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ao_outburst = OUTBURST;
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ao_buffersize = 16384;
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memset(&alsa_format, 0, sizeof(alsa_format));
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switch (format)
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{
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case AFMT_S8:
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alsa_format = SND_PCM_FORMAT_S8;
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break;
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case AFMT_U8:
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alsa_format = SND_PCM_FORMAT_U8;
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break;
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case AFMT_U16_LE:
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alsa_format = SND_PCM_FORMAT_U16_LE;
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break;
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case AFMT_U16_BE:
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alsa_format = SND_PCM_FORMAT_U16_BE;
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break;
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case AFMT_S16_LE:
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alsa_format = SND_PCM_FORMAT_S16_LE;
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break;
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case AFMT_S16_BE:
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alsa_format = SND_PCM_FORMAT_S16_BE;
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break;
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default:
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alsa_format = SND_PCM_FORMAT_MPEG;
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break;
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}
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switch(alsa_format)
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{
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case SND_PCM_FORMAT_S16_LE:
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case SND_PCM_FORMAT_U16_LE:
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ao_bps *= 2;
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break;
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case -1:
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printf("alsa-init: invalid format (%s) requested - output disabled\n",
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audio_out_format_name(format));
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return(0);
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}
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if ((err = snd_pcm_info_malloc(&alsa_info)) < 0)
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{
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printf("alsa-init: memory allocation error: %s\n", snd_strerror(err));
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return(0);
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}
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if ((alsa_device = malloc(ALSA_DEVICE_SIZE)) == NULL)
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{
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printf("alsa-init: memory allocation error: %s\n", strerror(errno));
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return(0);
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}
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snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%d,%d",
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snd_pcm_info_get_device(alsa_info),
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snd_pcm_info_get_subdevice(alsa_info));
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snd_pcm_info_free(alsa_info);
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printf("alsa-init: %d soundcard%s found, using: %s\n", cards+1,
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(cards >= 0) ? "" : "s", alsa_device);
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if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK,
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0)) < 0)
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{
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printf("alsa-init: playback open error: %s\n", snd_strerror(err));
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return(0);
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}
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snd_pcm_hw_params_malloc(&alsa_hwparams);
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snd_pcm_sw_params_malloc(&alsa_swparams);
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if ((err = snd_pcm_hw_params_any(alsa_handler, alsa_hwparams)) < 0)
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{
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printf("alsa-init: unable to get initial parameters: %s\n",
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snd_strerror(err));
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return(0);
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}
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if ((err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams,
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SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
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{
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printf("alsa-init: unable to set access type: %s\n",
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snd_strerror(err));
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return(0);
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}
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if ((err = snd_pcm_hw_params_set_format(alsa_handler, alsa_hwparams,
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alsa_format)) < 0)
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{
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printf("alsa-init: unable to set format: %s\n",
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snd_strerror(err));
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return(0);
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}
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if ((err = snd_pcm_hw_params_set_channels(alsa_handler, alsa_hwparams,
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ao_channels)) < 0)
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{
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printf("alsa-init: unable to set channels: %s\n",
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snd_strerror(err));
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return(0);
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}
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if ((err = snd_pcm_hw_params_set_rate(alsa_handler, alsa_hwparams,
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ao_samplerate, 0)) < 0)
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{
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printf("alsa-init: unable to set channels: %s\n",
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snd_strerror(err));
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return(0);
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}
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#ifdef buffersize
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if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams)) < 0)
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{
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printf("alsa-init: unable to get buffer size: %s\n",
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snd_strerror(err));
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return(0);
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} else
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ao_buffersize = err;
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#endif
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#ifdef buffertime
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{
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int alsa_buffer_time = 60;
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if ((err = snd_pcm_hw_params_set_buffer_time_near(alsa_handler, alsa_hwparams,
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alsa_buffer_time, 0)) < 0)
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{
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printf("alsa-init: unable to set buffer time near: %s\n",
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snd_strerror(err));
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return(0);
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} else
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alsa_buffer_time = err;
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if ((err = snd_pcm_hw_params_set_period_time_near(alsa_handler, alsa_hwparams,
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alsa_buffer_time/ao_bps, 0)) < 0)
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{
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printf("alsa-init: unable to set period time: %s\n",
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snd_strerror(err));
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return(0);
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}
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}
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#endif
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if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0)
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{
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printf("alsa-init: unable to set parameters: %s\n",
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snd_strerror(err));
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return(0);
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}
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if ((err = snd_pcm_sw_params_current(alsa_handler, alsa_swparams)) < 0)
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{
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printf("alsa-init: unable to get parameters: %s\n",
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snd_strerror(err));
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return(0);
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}
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if ((err = snd_pcm_sw_params_set_start_mode(alsa_handler, alsa_swparams,
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SND_PCM_START_DATA)) < 0)
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{
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printf("alsa-init: unable to set start mode: %s\n",
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snd_strerror(err));
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return(0);
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}
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if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0)
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{
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printf("alsa-init: unable to set parameters: %s\n",
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snd_strerror(err));
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return(0);
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}
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snd_pcm_sw_params_default(alsa_handler, alsa_swparams);
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if ((err = snd_pcm_prepare(alsa_handler)) < 0)
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{
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printf("alsa-init: pcm prepare error: %s\n", snd_strerror(err));
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return(0);
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}
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if ((err = snd_pcm_start(alsa_handler)) < 0)
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{
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printf("alsa-init: pcm start error: %s\n", snd_strerror(err));
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if (err != -EPIPE)
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return(0);
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if ((err = snd_pcm_start(alsa_handler)) < 0)
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{
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printf("alsa-init: pcm start error: %s\n", snd_strerror(err));
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return(0);
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}
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}
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printf("AUDIO: %d Hz/%d channels/%d bps/%d bytes buffer/%s\n",
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ao_samplerate, ao_channels+1, ao_bps, ao_buffersize,
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snd_pcm_format_description(alsa_format));
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return(1);
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}
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/* close audio device */
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static void uninit()
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{
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int err;
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if (alsa_device != NULL)
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free(alsa_device);
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snd_pcm_hw_params_free(alsa_hwparams);
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snd_pcm_sw_params_free(alsa_swparams);
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if ((err = snd_pcm_drain(alsa_handler)) < 0)
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{
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printf("alsa-uninit: pcm drain error: %s\n", snd_strerror(err));
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return;
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}
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if ((err = snd_pcm_reset(alsa_handler)) < 0)
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{
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printf("alsa-uninit: pcm reset error: %s\n", snd_strerror(err));
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return;
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}
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if ((err = snd_pcm_close(alsa_handler)) < 0)
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{
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printf("alsa-uninit: pcm close error: %s\n", snd_strerror(err));
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return;
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}
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}
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static void audio_pause()
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{
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int err;
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if ((err = snd_pcm_drain(alsa_handler)) < 0)
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{
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printf("alsa-pause: pcm drain error: %s\n", snd_strerror(err));
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return;
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}
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if ((err = snd_pcm_reset(alsa_handler)) < 0)
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{
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printf("alsa-pause: pcm reset error: %s\n", snd_strerror(err));
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return;
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}
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}
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static void audio_resume()
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{
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int err;
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if ((err = snd_pcm_prepare(alsa_handler)) < 0)
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{
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printf("alsa-resume: pcm prepare error: %s\n", snd_strerror(err));
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return;
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}
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if ((err = snd_pcm_start(alsa_handler)) < 0)
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{
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printf("alsa-resume: pcm start error: %s\n", snd_strerror(err));
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return;
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}
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}
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/* stop playing and empty buffers (for seeking/pause) */
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static void reset()
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{
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int err;
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if ((err = snd_pcm_drain(alsa_handler)) < 0)
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{
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printf("alsa-reset: pcm drain error: %s\n", snd_strerror(err));
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return;
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}
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if ((err = snd_pcm_reset(alsa_handler)) < 0)
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{
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printf("alsa-reset: pcm reset error: %s\n", snd_strerror(err));
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return;
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}
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if ((err = snd_pcm_prepare(alsa_handler)) < 0)
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{
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printf("alsa-reset: pcm prepare error: %s\n", snd_strerror(err));
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return;
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}
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if ((err = snd_pcm_start(alsa_handler)) < 0)
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{
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printf("alsa-reset: pcm start error: %s\n", snd_strerror(err));
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return;
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}
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}
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/*
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plays 'len' bytes of 'data'
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returns: number of bytes played
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*/
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static int play(void* data, int len, int flags)
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{
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if ((len = snd_pcm_writei(alsa_handler, data, len)) != len)
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{
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if (len == -EPIPE) /* underrun? */
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{
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printf("alsa-play: alsa underrun, resetting stream\n");
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if ((len = snd_pcm_prepare(alsa_handler)) < 0)
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{
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printf("alsa-play: playback prepare error: %s\n", snd_strerror(len));
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return(0);
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}
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if ((len = snd_pcm_writei(alsa_handler, data, len)) != len)
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{
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printf("alsa-play: write error after reset: %s - giving up\n",
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snd_strerror(len));
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return(0);
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}
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return(len); /* 2nd write was ok */
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}
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printf("alsa-play: output error: %s\n", snd_strerror(len));
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}
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return(len);
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}
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/* how many byes are free in the buffer */
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static int get_space()
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{
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snd_pcm_status_t *status;
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int ret;
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if ((ret = snd_pcm_status_malloc(&status)) < 0)
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{
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printf("alsa-space: memory allocation error: %s\n", snd_strerror(ret));
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return(0);
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}
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if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
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{
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printf("alsa-space: cannot get pcm status: %s\n", snd_strerror(ret));
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return(0);
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}
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switch(snd_pcm_status_get_state(status))
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{
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case SND_PCM_STATE_OPEN:
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case SND_PCM_STATE_PREPARED:
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case SND_PCM_STATE_RUNNING:
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ret = snd_pcm_status_get_avail(status) * ao_bps;
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break;
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default:
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ret = 0;
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}
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snd_pcm_status_free(status);
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return(ret);
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}
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/* how many unplayed bytes are in the buffer */
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static int get_delay()
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{
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snd_pcm_status_t *status;
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int ret;
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if ((ret = snd_pcm_status_malloc(&status)) < 0)
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{
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printf("alsa-delay: memory allocation error: %s\n", snd_strerror(ret));
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return(0);
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}
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if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
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{
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printf("alsa-delay: cannot get pcm status: %s\n", snd_strerror(ret));
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return(0);
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}
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switch(snd_pcm_status_get_state(status))
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{
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case SND_PCM_STATE_OPEN:
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case SND_PCM_STATE_PREPARED:
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case SND_PCM_STATE_RUNNING:
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ret = snd_pcm_status_get_delay(status) * ao_bps;
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break;
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default:
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ret = 0;
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}
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snd_pcm_status_free(status);
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return(ret);
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}
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