/* ao_alsa9 - ALSA-0.9.x output plugin for MPlayer (C) Alex Beregszaszi modified for better alsa-0.9.0beta8a-support by Joy Winter This driver is still at alpha stage. If you want stable sound-support use the OSS emulation instead. Any bugreports regarding to this driver are welcome either to the mplayer-user-mailinglist or directly to the authors. */ #include #include #include "../config.h" #include "audio_out.h" #include "audio_out_internal.h" #include "afmt.h" extern int verbose; static ao_info_t info = { "ALSA-0.9.x audio output", "alsa9", "Alex Beregszaszi , Joy Winter ", "under developement" }; LIBAO_EXTERN(alsa9) static snd_pcm_t *alsa_handler; static snd_pcm_format_t alsa_format; static snd_pcm_hw_params_t *alsa_hwparams; static snd_pcm_sw_params_t *alsa_swparams; static char *alsa_device; #define ALSA_DEVICE_SIZE 48 static int alsa_fragsize = 8192; /* possible 4096, original 8192 */ static int alsa_fragcount = 8; static int chunk_size = -1; static int start_delay = 1; /* to set/get/query special features/parameters */ static int control(int cmd, int arg) { switch(cmd) { case AOCONTROL_GET_DEVICE: return((char *)alsa_device); /* egy kicsit brutalis, dehat :) */ case AOCONTROL_SET_DEVICE: { int ret; strncpy(alsa_device, (char *)arg, ALSA_DEVICE_SIZE); uninit(); ret = init(ao_data.samplerate, ao_data.channels, ao_data.format, 0); if (ret == 0) return(CONTROL_ERROR); else return(CONTROL_OK); } } return(CONTROL_UNKNOWN); } #undef start /* orig. undef */ #define buffsize #define buffertime /* orig. undef? */ #define set_period #define sw_params /* orig. undef */ #undef set_start_mode /* orig. undef */ /* open & setup audio device return: 1=success 0=fail */ static int init(int rate_hz, int channels, int format, int flags) { int err; int cards = -1; snd_pcm_info_t *alsa_info; size_t xfer_align; //new snd_pcm_uframes_t start_threshold, stop_threshold; //new printf("alsa-init: this driver is still at alpha-stage. if you want stable sound support use the OSS emulation instead.\n"); printf("alsa-init: requested format: %d Hz, %d channels, %s\n", rate_hz, channels, audio_out_format_name(format)); alsa_handler = NULL; if (verbose) printf("alsa-init: compiled for ALSA-%s\n", SND_LIB_VERSION_STR); if ((err = snd_card_next(&cards)) < 0 || cards < 0) { printf("alsa-init: no soundcards found: %s\n", snd_strerror(err)); return(0); } ao_data.samplerate = rate_hz; ao_data.bps = channels; /* really this is bytes per frame so bad varname */ ao_data.format = format; ao_data.channels = channels; ao_data.outburst = OUTBURST; ao_data.buffersize = 16384; switch (format) { case AFMT_S8: alsa_format = SND_PCM_FORMAT_S8; break; case AFMT_U8: alsa_format = SND_PCM_FORMAT_U8; break; case AFMT_U16_LE: alsa_format = SND_PCM_FORMAT_U16_LE; break; case AFMT_U16_BE: alsa_format = SND_PCM_FORMAT_U16_BE; break; case AFMT_S16_LE: alsa_format = SND_PCM_FORMAT_S16_LE; break; case AFMT_S16_BE: alsa_format = SND_PCM_FORMAT_S16_BE; break; default: alsa_format = SND_PCM_FORMAT_MPEG; break; } switch(alsa_format) { case SND_PCM_FORMAT_S16_LE: case SND_PCM_FORMAT_U16_LE: ao_data.bps *= 2; break; case -1: printf("alsa-init: invalid format (%s) requested - output disabled\n", audio_out_format_name(format)); return(0); default: break; } if ((err = snd_pcm_info_malloc(&alsa_info)) < 0) { printf("alsa-init: memory allocation error: %s\n", snd_strerror(err)); return(0); } if (ao_subdevice != NULL) alsa_device = ao_subdevice; if (alsa_device == NULL) { if ((alsa_device = malloc(ALSA_DEVICE_SIZE)) == NULL) { printf("alsa-init: memory allocation error: %s\n", strerror(errno)); return(0); } snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%d,%d", snd_pcm_info_get_device(alsa_info), snd_pcm_info_get_subdevice(alsa_info)); snd_pcm_info_free(alsa_info); } printf("alsa-init: %d soundcard%s found, using: %s\n", cards+1, (cards >= 0) ? "" : "s", alsa_device); if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) { printf("alsa-init: playback open error: %s\n", snd_strerror(err)); return(0); } snd_pcm_hw_params_malloc(&alsa_hwparams); //snd_pcm_sw_params_malloc(&alsa_swparams); snd_pcm_sw_params_alloca(&alsa_swparams); if ((err = snd_pcm_hw_params_any(alsa_handler, alsa_hwparams)) < 0) { printf("alsa-init: unable to get initial parameters: %s\n", snd_strerror(err)); return(0); } if ((err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) { printf("alsa-init: unable to set access type: %s\n", snd_strerror(err)); return(0); } if ((err = snd_pcm_hw_params_set_format(alsa_handler, alsa_hwparams, alsa_format)) < 0) { printf("alsa-init: unable to set format: %s\n", snd_strerror(err)); return(0); } if ((err = snd_pcm_hw_params_set_channels(alsa_handler, alsa_hwparams, ao_data.channels)) < 0) { printf("alsa-init: unable to set channels: %s\n", snd_strerror(err)); return(0); } if ((err = snd_pcm_hw_params_set_rate_near(alsa_handler, alsa_hwparams, ao_data.samplerate, 0)) < 0) /* was originally only snd_pcm_hw_params_set_rate jp*/ { printf("alsa-init: unable to set samplerate-2: %s\n", snd_strerror(err)); //snd_pcm_hw_params_dump(alsa_hwparams, errlog); jp return(0); } #ifdef set_period { if ((err = snd_pcm_hw_params_set_period_size(alsa_handler, alsa_hwparams, alsa_fragsize / 4, 0)) < 0) { printf("alsa-init: unable to set periodsize: %s\n", snd_strerror(err)); return(0); } if ((err = snd_pcm_hw_params_set_periods(alsa_handler, alsa_hwparams, alsa_fragcount, 0)) < 0) { printf("alsa-init: unable to set periods: %s\n", snd_strerror(err)); return(0); } } #endif #ifdef buffsize if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams)) < 0) { printf("alsa-init: unable to get buffer size: %s\n", snd_strerror(err)); return(0); } else { ao_data.buffersize = err; if (verbose) printf("alsa-init: got buffersize %i\n", ao_data.buffersize); } #endif #ifdef buffertime { int alsa_buffer_time = 500000; /* original 60 */ if ((err = snd_pcm_hw_params_set_buffer_time_near(alsa_handler, alsa_hwparams, alsa_buffer_time, 0)) < 0) { printf("alsa-init: unable to set buffer time near: %s\n", snd_strerror(err)); return(0); } else alsa_buffer_time = err; if ((err = snd_pcm_hw_params_set_period_time_near(alsa_handler, alsa_hwparams, alsa_buffer_time/4, 0)) < 0) /* original: alsa_buffer_time/ao_data.bps */ { printf("alsa-init: unable to set period time: %s\n", snd_strerror(err)); return(0); } printf("alsa-init: buffer_time: %d, period_time :%d\n", alsa_buffer_time, err); } #endif if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0) { printf("alsa-init: unable to set parameters: %s\n", snd_strerror(err)); return(0); } #ifdef sw_params { chunk_size = snd_pcm_hw_params_get_period_size(alsa_hwparams, 0); start_threshold = (double) ao_data.samplerate * start_delay / 1000000; xfer_align = snd_pcm_sw_params_get_xfer_align(alsa_swparams); if ((err = snd_pcm_sw_params_current(alsa_handler, alsa_swparams)) < 0) { printf("alsa-init: unable to get parameters: %s\n", snd_strerror(err)); return(0); } if ((err = snd_pcm_sw_params_set_avail_min(alsa_handler, alsa_swparams, chunk_size)) < 0) { printf("alsa-init: unable to set avail_min %s\n",snd_strerror(err)); return(0); } if ((err = snd_pcm_sw_params_set_start_threshold(alsa_handler, alsa_swparams, start_threshold)) < 0) { printf("alsa-init: unable to set start_threshold %s\n",snd_strerror(err)); return(0); } } // if ((err = snd_pcm_sw_params_set_xfer_align(alsa_handler, alsa_swparams, xfer_align)) < 0) //{ // printf("alsa-init: unable to set xfer_align: %s\n", // snd_strerror(err)); // return(0); //} #ifdef set_start_mode if ((err = snd_pcm_sw_params_set_start_mode(alsa_handler, alsa_swparams, SND_PCM_START_DATA)) < 0) { printf("alsa-init: unable to set start mode: %s\n", snd_strerror(err)); return(0); } #endif if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0) { printf("alsa-init: unable to set parameters: %s\n", snd_strerror(err)); return(0); } // snd_pcm_sw_params_default(alsa_handler, alsa_swparams); #endif if ((err = snd_pcm_prepare(alsa_handler)) < 0) { printf("alsa-init: pcm prepare error: %s\n", snd_strerror(err)); return(0); } #ifdef start if ((err = snd_pcm_start(alsa_handler)) < 0) { printf("alsa-init: pcm start error: %s\n", snd_strerror(err)); if (err != -EPIPE) return(0); if ((err = snd_pcm_start(alsa_handler)) < 0) { printf("alsa-init: pcm start error: %s\n", snd_strerror(err)); return(0); } } #endif printf("AUDIO: %d Hz/%d channels/%d bpf/%d bytes buffer/%s\n", ao_data.samplerate, ao_data.channels, ao_data.bps, ao_data.buffersize, snd_pcm_format_description(alsa_format)); return(1); } /* close audio device */ static void uninit() { int err; if (alsa_device != NULL) free(alsa_device); snd_pcm_hw_params_free(alsa_hwparams); snd_pcm_sw_params_free(alsa_swparams); if ((err = snd_pcm_drain(alsa_handler)) < 0) { printf("alsa-uninit: pcm drain error: %s\n", snd_strerror(err)); return; } #ifdef start if ((err = snd_pcm_reset(alsa_handler)) < 0) { printf("alsa-uninit: pcm reset error: %s\n", snd_strerror(err)); return; } #endif if ((err = snd_pcm_close(alsa_handler)) < 0) { printf("alsa-uninit: pcm close error: %s\n", snd_strerror(err)); return; } } static void audio_pause() { int err; if ((err = snd_pcm_drain(alsa_handler)) < 0) { printf("alsa-pause: pcm drain error: %s\n", snd_strerror(err)); return; } #ifdef reset if ((err = snd_pcm_reset(alsa_handler)) < 0) { printf("alsa-pause: pcm reset error: %s\n", snd_strerror(err)); return; } #endif } static void audio_resume() { int err; if ((err = snd_pcm_prepare(alsa_handler)) < 0) { printf("alsa-resume: pcm prepare error: %s\n", snd_strerror(err)); return; } #ifdef start if ((err = snd_pcm_start(alsa_handler)) < 0) { printf("alsa-resume: pcm start error: %s\n", snd_strerror(err)); return; } #endif } /* stop playing and empty buffers (for seeking/pause) */ static void reset() { int err; if ((err = snd_pcm_drain(alsa_handler)) < 0) { printf("alsa-reset: pcm drain error: %s\n", snd_strerror(err)); return; } #ifdef start if ((err = snd_pcm_reset(alsa_handler)) < 0) { printf("alsa-reset: pcm reset error: %s\n", snd_strerror(err)); return; } #endif if ((err = snd_pcm_prepare(alsa_handler)) < 0) { printf("alsa-reset: pcm prepare error: %s\n", snd_strerror(err)); return; } #ifdef start if ((err = snd_pcm_start(alsa_handler)) < 0) { printf("alsa-reset: pcm start error: %s\n", snd_strerror(err)); return; } #endif } /* plays 'len' bytes of 'data' returns: number of bytes played */ static int play(void* data, int len, int flags) { int got_len; got_len = snd_pcm_writei(alsa_handler, data, len / 4); //if ((got_len = snd_pcm_writei(alsa_handler, data, (len/ao_data.bps))) != (len/ao_data.bps)) { //SHOULD BE FIXED if (got_len == -EPIPE) /* underrun? */ { printf("alsa-play: alsa underrun, resetting stream\n"); if ((got_len = snd_pcm_prepare(alsa_handler)) < 0) { printf("alsa-play: playback prepare error: %s\n", snd_strerror(got_len)); return(0); } if ((got_len = snd_pcm_writei(alsa_handler, data, (len/ao_data.bps))) != (len/ao_data.bps)) { printf("alsa-play: write error after reset: %s - giving up\n", snd_strerror(got_len)); return(0); } return(len); /* 2nd write was ok */ } return(len); //} } /* how many byes are free in the buffer */ static int get_space() { snd_pcm_status_t *status; int ret; if ((ret = snd_pcm_status_malloc(&status)) < 0) { printf("alsa-space: memory allocation error: %s\n", snd_strerror(ret)); return(0); } if ((ret = snd_pcm_status(alsa_handler, status)) < 0) { printf("alsa-space: cannot get pcm status: %s\n", snd_strerror(ret)); return(0); } switch(snd_pcm_status_get_state(status)) { case SND_PCM_STATE_OPEN: case SND_PCM_STATE_PREPARED: case SND_PCM_STATE_RUNNING: ret = snd_pcm_status_get_avail(status) * ao_data.bps; break; default: ret = 0; } snd_pcm_status_free(status); if (ret < 0) ret = 0; return(ret); } /* delay in seconds between first and last sample in buffer */ static float get_delay() { snd_pcm_status_t *status; float ret; if ((ret = snd_pcm_status_malloc(&status)) < 0) { printf("alsa-delay: memory allocation error: %s\n", snd_strerror(ret)); return(0); } if ((ret = snd_pcm_status(alsa_handler, status)) < 0) { printf("alsa-delay: cannot get pcm status: %s\n", snd_strerror(ret)); return(0); } switch(snd_pcm_status_get_state(status)) { case SND_PCM_STATE_OPEN: case SND_PCM_STATE_PREPARED: case SND_PCM_STATE_RUNNING: ret = (float)snd_pcm_status_get_delay(status)/(float)ao_data.samplerate; break; default: ret = 0; } snd_pcm_status_free(status); if (ret < 0) ret = 0; return(ret); }