/* ao_alsa9 - ALSA-0.9.x output plugin for MPlayer (C) Alex Beregszaszi modified for real alsa-0.9.0-support by Joy Winter additional AC3 passthrough support by Andy Lo A Foe 08/22/2002 iec958-init rewritten and merged with common init, joy Any bugreports regarding to this driver are welcome. */ #include #include #include #include #include #include #include "../config.h" #include "../mixer.h" #if HAVE_SYS_ASOUNDLIB_H #include #elif HAVE_ALSA_ASOUNDLIB_H #include #else #error "asoundlib.h is not in sys/ or alsa/ - please bugreport" #endif #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; /* possible 4096, original 8192 * was only needed for calculating chunksize? */ static int alsa_fragsize = 4096; /* 16 sets buffersize to 16 * chunksize is as default 1024 * which seems to be good avarge for most situations * so buffersize is 16384 frames by default */ static int alsa_fragcount = 16; static int chunk_size = 1024; //is alsa_fragsize / 4 #define MIN_CHUNK_SIZE 1024 static size_t bits_per_sample, bytes_per_sample, bits_per_frame; static size_t chunk_bytes; int ao_mmap = 0; int ao_noblock = 0; int first = 1; static int open_mode; static int set_block_mode; static int alsa_can_pause = 0; #define ALSA_DEVICE_SIZE 48 #undef BUFFERTIME #define SET_CHUNKSIZE #undef USE_POLL /* to set/get/query special features/parameters */ static int control(int cmd, void *arg) { switch(cmd) { case AOCONTROL_QUERY_FORMAT: return CONTROL_TRUE; #ifndef WORDS_BIGENDIAN case AOCONTROL_GET_VOLUME: case AOCONTROL_SET_VOLUME: { ao_control_vol_t *vol = (ao_control_vol_t *)arg; int err; snd_mixer_t *handle; snd_mixer_elem_t *elem; snd_mixer_selem_id_t *sid; static const char *mix_name = NULL; static char *card = NULL; long pmin, pmax; long get_vol, set_vol; float calc_vol, diff, f_multi; if(mix_name == NULL){ if(mixer_device) { card = strdup(mixer_device); mix_name = strchr(card, '/'); if(mix_name) { *mix_name++ = 0; } else { mix_name = "PCM"; } } else { mix_name = "PCM"; card = "default"; } } if(ao_data.format == AFMT_AC3) return CONTROL_TRUE; //allocate simple id snd_mixer_selem_id_alloca(&sid); //sets simple-mixer index and name snd_mixer_selem_id_set_index(sid, 0); snd_mixer_selem_id_set_name(sid, mix_name); if ((err = snd_mixer_open(&handle, 0)) < 0) { printf("alsa-control: mixer open error: %s\n", snd_strerror(err)); return CONTROL_ERROR; } if ((err = snd_mixer_attach(handle, card)) < 0) { printf("alsa-control: mixer attach %s error: %s", card, snd_strerror(err)); snd_mixer_close(handle); return CONTROL_ERROR; } if ((err = snd_mixer_selem_register(handle, NULL, NULL)) < 0) { printf("alsa-control: mixer register error: %s", snd_strerror(err)); snd_mixer_close(handle); return CONTROL_ERROR; } err = snd_mixer_load(handle); if (err < 0) { printf("alsa-control: mixer load error: %s", snd_strerror(err)); snd_mixer_close(handle); return CONTROL_ERROR; } elem = snd_mixer_find_selem(handle, sid); if (!elem) { printf("alsa-control: unable to find simple control '%s',%i\n", snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid)); snd_mixer_close(handle); return CONTROL_ERROR; } snd_mixer_selem_get_playback_volume_range(elem,&pmin,&pmax); f_multi = (100 / (float)pmax); if (cmd == AOCONTROL_SET_VOLUME) { diff = (vol->left+vol->right) / 2; set_vol = rint(diff / f_multi); if (set_vol < 0) set_vol = 0; else if (set_vol > pmax) set_vol = pmax; //setting channels if ((err = snd_mixer_selem_set_playback_volume(elem, 0, set_vol)) < 0) { printf("alsa-control: error setting left channel, %s",snd_strerror(err)); return CONTROL_ERROR; } if ((err = snd_mixer_selem_set_playback_volume(elem, 1, set_vol)) < 0) { printf("alsa-control: error setting right channel, %s",snd_strerror(err)); return CONTROL_ERROR; } //printf("diff=%f, set_vol=%i, pmax=%i, mult=%f\n", diff, set_vol, pmax, f_multi); } else { snd_mixer_selem_get_playback_volume(elem, 0, &get_vol); calc_vol = get_vol; calc_vol = rintf(calc_vol * f_multi); vol->left = vol->right = (int)calc_vol; //printf("get_vol = %i, calc=%i\n",get_vol, calc_vol); } snd_mixer_close(handle); return CONTROL_OK; } #endif } //end switch return(CONTROL_UNKNOWN); } /* 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; int period_val; snd_pcm_info_t *alsa_info; char *str_block_mode; int device_set = 0; printf("alsa-init: requested format: %d Hz, %d channels, %s\n", rate_hz, channels, audio_out_format_name(format)); alsa_handler = NULL; if (verbose>0) 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 * rate_hz; ao_data.format = format; ao_data.channels = channels; ao_data.outburst = OUTBURST; //ao_data.buffersize = MAX_OUTBURST; // was 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; #ifndef WORDS_BIGENDIAN case AFMT_AC3: #endif case AFMT_S16_LE: alsa_format = SND_PCM_FORMAT_S16_LE; break; #ifdef WORDS_BIGENDIAN case AFMT_AC3: #endif case AFMT_S16_BE: alsa_format = SND_PCM_FORMAT_S16_BE; break; case AFMT_S32_LE: alsa_format = SND_PCM_FORMAT_S32_LE; break; case AFMT_S32_BE: alsa_format = SND_PCM_FORMAT_S32_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 SND_PCM_FORMAT_S32_LE: case SND_PCM_FORMAT_S32_BE: ao_data.bps *= 4; break; case -1: printf("alsa-init: invalid format (%s) requested - output disabled\n", audio_out_format_name(format)); return(0); default: break; } if (ao_subdevice) { //start parsing ao_subdevice, ugly and not thread safe! //maybe there's a better way? int i2 = 1; int i3 = 0; char *sub_str; char *token_str[3]; char* test_str = strdup(ao_subdevice); if ((strcspn(ao_subdevice, ":")) > 0) { sub_str = strtok(test_str, ":"); *(token_str) = sub_str; while (((sub_str = strtok(NULL, ":")) != NULL) && (i2 <= 3)) { *(token_str+i2) = sub_str; i2 += 1; } for (i3=0; i3 <= i2-1; i3++) { if (strcmp(*(token_str + i3), "mmap") == 0) { ao_mmap = 1; } else if (strcmp(*(token_str+i3), "noblock") == 0) { ao_noblock = 1; } else if (strcmp(*(token_str+i3), "hw") == 0) { if ((i3 < i2-1) && (strcmp(*(token_str+i3+1), "noblock") != 0) && (strcmp(*(token_str+i3+1), "mmap") != 0)) { char *tmp; alsa_device = alloca(ALSA_DEVICE_SIZE); snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%s", *(token_str+(i3+1))); if ((tmp = strrchr(alsa_device, '.')) && isdigit(*(tmp+1))) *tmp = ','; device_set = 1; } else { alsa_device = *(token_str+i3); device_set = 1; } } else if (device_set == 0 && (!ao_mmap || !ao_noblock)) { alsa_device = *(token_str+i3); device_set = 1; } } } } else { //end parsing ao_subdevice /* in any case for multichannel playback we should select * appropriate device */ char devstr[128]; switch (channels) { case 4: strcpy(devstr, "surround40"); alsa_device = devstr; break; case 6: strcpy(devstr, "surround51"); alsa_device = devstr; break; default: } } /* switch for spdif * sets opening sequence for SPDIF * sets also the playback and other switches 'on the fly' * while opening the abstract alias for the spdif subdevice * 'iec958' */ if (format == AFMT_AC3) { char devstr[128]; unsigned char s[4]; int err, c; switch (channels) { case 1: case 2: s[0] = IEC958_AES0_NONAUDIO | IEC958_AES0_CON_EMPHASIS_NONE; s[1] = IEC958_AES1_CON_ORIGINAL | IEC958_AES1_CON_PCM_CODER; s[2] = 0; s[3] = IEC958_AES3_CON_FS_48000; sprintf(devstr, "iec958:AES0=0x%x,AES1=0x%x,AES2=0x%x,AES3=0x%x", s[0], s[1], s[2], s[3]); if (verbose>0) printf("alsa-spdif-init: playing AC3, %i channels\n", channels); break; case 4: strcpy(devstr, "surround40"); break; case 6: strcpy(devstr, "surround51"); break; default: fprintf(stderr, "%d channels are not supported\n", channels); return(0); } alsa_device = devstr; } if (alsa_device == NULL) { int tmp_device, tmp_subdevice, err; if ((err = snd_pcm_info_malloc(&alsa_info)) < 0) { printf("alsa-init: memory allocation error: %s\n", snd_strerror(err)); return(0); } if ((alsa_device = alloca(ALSA_DEVICE_SIZE)) == NULL) { printf("alsa-init: memory allocation error: %s\n", strerror(errno)); return(0); } if ((tmp_device = snd_pcm_info_get_device(alsa_info)) < 0) { printf("alsa-init: can't get device\n"); return(0); } if ((tmp_subdevice = snd_pcm_info_get_subdevice(alsa_info)) < 0) { printf("alsa-init: can't get subdevice\n"); return(0); } if (verbose>0) printf("alsa-init: got device=%i, subdevice=%i\n", tmp_device, tmp_subdevice); if ((err = snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%1d,%1d", tmp_device, tmp_subdevice)) <= 0) { printf("alsa-init: can't write device-id\n"); } snd_pcm_info_free(alsa_info); printf("alsa-init: %d soundcard%s found, using: %s\n", cards+1, (cards >= 0) ? "" : "s", alsa_device); } else if (strcmp(alsa_device, "help") == 0) { printf("alsa-help: available options are:\n"); printf(" mmap: sets mmap-mode\n"); printf(" noblock: sets noblock-mode\n"); printf(" device-name: sets device name (change comma to point)\n"); printf(" example -ao alsa9:mmap:noblock:hw:0.3 sets noblock-mode,\n"); printf(" mmap-mode and the device-name as first card fourth device\n"); return(0); } else { printf("alsa-init: soundcard set to %s\n", alsa_device); } //setting modes for block or nonblock-mode if (ao_noblock) { open_mode = SND_PCM_NONBLOCK; set_block_mode = 1; str_block_mode = "nonblock-mode"; } else { open_mode = 0; set_block_mode = 0; str_block_mode = "block-mode"; } //sets buff/chunksize if its set manually if (ao_data.buffersize) { switch (ao_data.buffersize) { case 1: alsa_fragcount = 16; chunk_size = 512; if (verbose>0) { printf("alsa-init: buffersize set manually to 8192\n"); printf("alsa-init: chunksize set manually to 512\n"); } break; case 2: alsa_fragcount = 8; chunk_size = 1024; if (verbose>0) { printf("alsa-init: buffersize set manually to 8192\n"); printf("alsa-init: chunksize set manually to 1024\n"); } break; case 3: alsa_fragcount = 32; chunk_size = 512; if (verbose>0) { printf("alsa-init: buffersize set manually to 16384\n"); printf("alsa-init: chunksize set manually to 512\n"); } break; case 4: alsa_fragcount = 16; chunk_size = 1024; if (verbose>0) { printf("alsa-init: buffersize set manually to 16384\n"); printf("alsa-init: chunksize set manually to 1024\n"); } break; default: alsa_fragcount = 16; if (ao_mmap) chunk_size = 512; else chunk_size = 1024; break; } } if (!alsa_handler) { //modes = 0, SND_PCM_NONBLOCK, SND_PCM_ASYNC if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK, open_mode)) < 0) { if (err != -EBUSY && ao_noblock) { printf("alsa-init: open in nonblock-mode failed, trying to open in block-mode\n"); 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); } else { set_block_mode = 0; str_block_mode = "block-mode"; } } else { printf("alsa-init: playback open error: %s\n", snd_strerror(err)); return(0); } } if ((err = snd_pcm_nonblock(alsa_handler, set_block_mode)) < 0) { printf("alsa-init: error set block-mode %s\n", snd_strerror(err)); } else if (verbose>0) { printf("alsa-init: pcm opend in %s\n", str_block_mode); } snd_pcm_hw_params_alloca(&alsa_hwparams); snd_pcm_sw_params_alloca(&alsa_swparams); // setting hw-parameters 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 (ao_mmap) { snd_pcm_access_mask_t *mask = alloca(snd_pcm_access_mask_sizeof()); snd_pcm_access_mask_none(mask); snd_pcm_access_mask_set(mask, SND_PCM_ACCESS_MMAP_INTERLEAVED); snd_pcm_access_mask_set(mask, SND_PCM_ACCESS_MMAP_NONINTERLEAVED); snd_pcm_access_mask_set(mask, SND_PCM_ACCESS_MMAP_COMPLEX); err = snd_pcm_hw_params_set_access_mask(alsa_handler, alsa_hwparams, mask); printf("alsa-init: mmap set\n"); } else { err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams,SND_PCM_ACCESS_RW_INTERLEAVED); } if (err < 0) { printf("alsa-init: unable to set access type: %s\n", snd_strerror(err)); return (0); } /* workaround for nonsupported formats sets default format to S16_LE if the given formats aren't supported */ if ((err = snd_pcm_hw_params_test_format(alsa_handler, alsa_hwparams, alsa_format)) < 0) { printf("alsa-init: format %s are not supported by hardware, trying default\n", audio_out_format_name(format)); alsa_format = SND_PCM_FORMAT_S16_LE; ao_data.format = AFMT_S16_LE; ao_data.bps = channels * rate_hz * 2; } bytes_per_sample = ao_data.bps / ao_data.samplerate; //it should be here 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) { printf("alsa-init: unable to set samplerate-2: %s\n", snd_strerror(err)); return(0); } #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); } if (verbose>0) printf("alsa-init: buffer_time: %d, period_time :%d\n",alsa_buffer_time, err); } #endif #ifdef SET_CHUNKSIZE { //set chunksize if ((err = snd_pcm_hw_params_set_period_size_near(alsa_handler, alsa_hwparams, chunk_size, 0)) < 0) { printf("alsa-init: unable to set periodsize: %s\n", snd_strerror(err)); return(0); } else if (verbose>0) { printf("alsa-init: chunksize set to %i\n", chunk_size); } //set period_count if ((period_val = snd_pcm_hw_params_get_periods_max(alsa_hwparams, 0)) < alsa_fragcount) { alsa_fragcount = period_val; } if (verbose>0) printf("alsa-init: current val=%i, fragcount=%i\n", period_val, alsa_fragcount); if ((err = snd_pcm_hw_params_set_periods_near(alsa_handler, alsa_hwparams, alsa_fragcount, 0)) < 0) { printf("alsa-init: unable to set periods: %s\n", snd_strerror(err)); } } #endif /* finally install hardware parameters */ if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0) { printf("alsa-init: unable to set hw-parameters: %s\n", snd_strerror(err)); return(0); } // end setting hw-params // gets buffersize for control if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams)) < 0) { printf("alsa-init: unable to get buffersize: %s\n", snd_strerror(err)); return(0); } else { ao_data.buffersize = err * bytes_per_sample; if (verbose>0) printf("alsa-init: got buffersize=%i\n", ao_data.buffersize); } // setting sw-params (only avail-min) if noblocking mode was choosed if (ao_noblock) { 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); } //set min available frames to consider pcm ready (4) //increased for nonblock-mode should be set dynamically later if ((err = snd_pcm_sw_params_set_avail_min(alsa_handler, alsa_swparams, 4)) < 0) { printf("alsa-init: unable to set avail_min %s\n",snd_strerror(err)); return(0); } if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0) { printf("alsa-init: unable to install sw-params\n"); return(0); } bits_per_sample = snd_pcm_format_physical_width(alsa_format); bits_per_frame = bits_per_sample * channels; chunk_bytes = chunk_size * bits_per_frame / 8; if (verbose>0) { printf("alsa-init: bits per sample (bps)=%i, bits per frame (bpf)=%i, chunk_bytes=%i\n",bits_per_sample,bits_per_frame,chunk_bytes);} }//end swparams if ((err = snd_pcm_prepare(alsa_handler)) < 0) { printf("alsa-init: pcm prepare error: %s\n", snd_strerror(err)); return(0); } printf("alsa9: %d Hz/%d channels/%d bpf/%d bytes buffer/%s\n", ao_data.samplerate, ao_data.channels, bytes_per_sample, ao_data.buffersize, snd_pcm_format_description(alsa_format)); } // end switch alsa_handler (spdif) alsa_can_pause = snd_pcm_hw_params_can_pause(alsa_hwparams); return(1); } // end init /* close audio device */ static void uninit() { if (alsa_handler) { int err; if (!ao_noblock) { if ((err = snd_pcm_drop(alsa_handler)) < 0) { printf("alsa-uninit: pcm drop error: %s\n", snd_strerror(err)); return; } } if ((err = snd_pcm_close(alsa_handler)) < 0) { printf("alsa-uninit: pcm close error: %s\n", snd_strerror(err)); return; } else { alsa_handler = NULL; alsa_device = NULL; printf("alsa-uninit: pcm closed\n"); } } else { printf("alsa-uninit: no handler defined!\n"); } } static void audio_pause() { int err; if (alsa_can_pause) { if ((err = snd_pcm_pause(alsa_handler, 1)) < 0) { printf("alsa-pause: pcm pause error: %s\n", snd_strerror(err)); return; } if (verbose) printf("alsa-pause: pause supported by hardware\n"); } else { if ((err = snd_pcm_drop(alsa_handler)) < 0) { printf("alsa-pause: pcm drop error: %s\n", snd_strerror(err)); return; } } } static void audio_resume() { int err; if (alsa_can_pause) { if ((err = snd_pcm_pause(alsa_handler, 0)) < 0) { printf("alsa-resume: pcm resume error: %s\n", snd_strerror(err)); return; } if (verbose) printf("alsa-resume: resume supported by hardware\n"); } else { if ((err = snd_pcm_prepare(alsa_handler)) < 0) { printf("alsa-resume: pcm prepare error: %s\n", snd_strerror(err)); return; } } } /* stop playing and empty buffers (for seeking/pause) */ static void reset() { int err; if ((err = snd_pcm_drop(alsa_handler)) < 0) { printf("alsa-reset: pcm drop error: %s\n", snd_strerror(err)); return; } if ((err = snd_pcm_prepare(alsa_handler)) < 0) { printf("alsa-reset: pcm prepare error: %s\n", snd_strerror(err)); return; } return; } #ifdef USE_POLL static int wait_for_poll(snd_pcm_t *handle, struct pollfd *ufds, unsigned int count) { unsigned short revents; while (1) { poll(ufds, count, -1); snd_pcm_poll_descriptors_revents(handle, ufds, count, &revents); if (revents & POLLERR) return -EIO; if (revents & POLLOUT) return 0; } } #endif #ifndef timersub #define timersub(a, b, result) \ do { \ (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \ (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \ if ((result)->tv_usec < 0) { \ --(result)->tv_sec; \ (result)->tv_usec += 1000000; \ } \ } while (0) #endif /* I/O error handler */ static int xrun(u_char *str_mode) { int err; snd_pcm_status_t *status; snd_pcm_status_alloca(&status); if ((err = snd_pcm_status(alsa_handler, status))<0) { printf("status error: %s", snd_strerror(err)); return(0); } if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) { struct timeval now, diff, tstamp; gettimeofday(&now, 0); snd_pcm_status_get_trigger_tstamp(status, &tstamp); timersub(&now, &tstamp, &diff); printf("alsa-%s: xrun of at least %.3f msecs. resetting stream\n", str_mode, diff.tv_sec * 1000 + diff.tv_usec / 1000.0); } if ((err = snd_pcm_prepare(alsa_handler))<0) { printf("xrun: prepare error: %s", snd_strerror(err)); return(0); } return(1); /* ok, data should be accepted again */ } static int play_normal(void* data, int len); static int play_mmap(void* data, int len); static int play(void* data, int len, int flags) { int result; if (ao_mmap) result = play_mmap(data, len); else result = play_normal(data, len); return result; } /* plays 'len' bytes of 'data' returns: number of bytes played modified last at 29.06.02 by jp thanxs for marius for giving us the light ;) */ static int play_normal(void* data, int len) { //bytes_per_sample is always 4 for 2 chn S16_LE int num_frames = len / bytes_per_sample; char *output_samples = (char *)data; snd_pcm_sframes_t res = 0; //fprintf(stderr,"alsa-play: frames=%i, len=%i\n",num_frames,len); if (!alsa_handler) { printf("alsa-play: device configuration error"); return 0; } while (num_frames > 0) { res = snd_pcm_writei(alsa_handler, (void *)output_samples, num_frames); if (res == -EAGAIN) { snd_pcm_wait(alsa_handler, 1000); } else if (res == -EPIPE) { /* underrun */ if (xrun("play") <= 0) { printf("alsa-play: xrun reset error"); return(0); } } else if (res == -ESTRPIPE) { /* suspend */ printf("alsa-play: pcm in suspend mode. trying to resume\n"); while ((res = snd_pcm_resume(alsa_handler)) == -EAGAIN) sleep(1); } else if (res < 0) { printf("alsa-play: unknown status, trying to reset soundcard\n"); if ((res = snd_pcm_prepare(alsa_handler)) < 0) { printf("alsa-play: snd prepare error"); return(0); break; } } if (res > 0) { /* output_samples += ao_data.channels * res; */ output_samples += res * bytes_per_sample; num_frames -= res; } } //end while if (res < 0) { printf("alsa-play: write error %s", snd_strerror(res)); return 0; } return res < 0 ? (int)res : len - len % bytes_per_sample; } /* mmap-mode mainly based on descriptions by Joshua Haberman * 'An overview of the ALSA API' http://people.debian.org/~joshua/x66.html * and some help by Paul Davis */ static int play_mmap(void* data, int len) { snd_pcm_sframes_t commitres, frames_available; snd_pcm_uframes_t frames_transmit, size, offset; const snd_pcm_channel_area_t *area; void *outbuffer; int err, result; #ifdef USE_POLL //seems not really be needed struct pollfd *ufds; int count; count = snd_pcm_poll_descriptors_count (alsa_handler); ufds = malloc(sizeof(struct pollfd) * count); snd_pcm_poll_descriptors(alsa_handler, ufds, count); //first wait_for_poll if (err = (wait_for_poll(alsa_handler, ufds, count) < 0)) { if (snd_pcm_state(alsa_handler) == SND_PCM_STATE_XRUN || snd_pcm_state(alsa_handler) == SND_PCM_STATE_SUSPENDED) { xrun("play"); } } #endif outbuffer = alloca(ao_data.buffersize); //don't trust get_space() ;) frames_available = snd_pcm_avail_update(alsa_handler) * bytes_per_sample; if (frames_available < 0) xrun("play"); if (frames_available < 4) { if (first) { first = 0; snd_pcm_start(alsa_handler); } else { //FIXME should break and return 0? snd_pcm_wait(alsa_handler, -1); first = 1; } } /* len is simply the available bufferspace got by get_space() * but real avail_buffer in frames is ab/bytes_per_sample */ size = len / bytes_per_sample; //if (verbose) //printf("len: %i size %i, f_avail %i, bps %i ...\n", len, size, frames_available, bytes_per_sample); frames_transmit = size; /* prepare areas and set sw-pointers * frames_transmit returns the real available buffer-size * sometimes != frames_available cause of ringbuffer 'emulation' */ snd_pcm_mmap_begin(alsa_handler, &area, &offset, &frames_transmit); /* this is specific to interleaved streams (or non-interleaved * streams with only one channel) */ outbuffer = ((char *) area->addr + (area->first + area->step * offset) / 8); //8 //write data memcpy(outbuffer, data, (frames_transmit * bytes_per_sample)); commitres = snd_pcm_mmap_commit(alsa_handler, offset, frames_transmit); if (commitres < 0 || commitres != frames_transmit) { if (snd_pcm_state(alsa_handler) == SND_PCM_STATE_XRUN || snd_pcm_state(alsa_handler) == SND_PCM_STATE_SUSPENDED) { xrun("play"); } } //if (verbose) //printf("mmap ft: %i, cres: %i\n", frames_transmit, commitres); /* err = snd_pcm_area_copy(&area, offset, &data, offset, len, alsa_format); */ /* if (err < 0) { */ /* printf("area-copy-error\n"); */ /* return 0; */ /* } */ //calculate written frames! result = commitres * bytes_per_sample; /* if (verbose) { */ /* if (len == result) */ /* printf("result: %i, frames written: %i ...\n", result, frames_transmit); */ /* else */ /* printf("result: %i, frames written: %i, result != len ...\n", result, frames_transmit); */ /* } */ //mplayer doesn't like -result if (result < 0) result = 0; #ifdef USE_POLL free(ufds); #endif return result; } /* how many byes are free in the buffer */ static int get_space() { snd_pcm_status_t *status; int ret; char *str_status; //snd_pcm_sframes_t avail_frames = 0; 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: str_status = "open"; case SND_PCM_STATE_PREPARED: if (str_status != "open") { str_status = "prepared"; first = 1; ret = snd_pcm_status_get_avail(status) * bytes_per_sample; if (ret == 0) //ugly workaround for hang in mmap-mode ret = 10; break; } case SND_PCM_STATE_RUNNING: ret = snd_pcm_status_get_avail(status) * bytes_per_sample; //avail_frames = snd_pcm_avail_update(alsa_handler) * bytes_per_sample; if (str_status != "open" && str_status != "prepared") str_status = "running"; break; case SND_PCM_STATE_PAUSED: if (verbose>0) printf("alsa-space: paused"); str_status = "paused"; ret = 0; break; case SND_PCM_STATE_XRUN: xrun("space"); str_status = "xrun"; first = 1; ret = 0; break; default: str_status = "undefined"; ret = snd_pcm_status_get_avail(status) * bytes_per_sample; if (ret <= 0) { xrun("space"); } } if (verbose>0 && str_status != "running") printf("alsa-space: free space = %i, status=%i, %s --\n", ret, status, str_status); snd_pcm_status_free(status); if (ret < 0) { printf("negative value!!\n"); ret = 0; } // workaround for too small value returned if (ret < MIN_CHUNK_SIZE) ret = 0; return(ret); } /* delay in seconds between first and last sample in buffer */ static float get_delay() { if (alsa_handler) { 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); } else { return(0); } }