static int query_chmaps(snd_pcm_t *pcm) { snd_pcm_chmap_query_t **maps = snd_pcm_query_chmaps(pcm); snd_pcm_chmap_query_t **p, *v; if (!maps) { printf("Cannot query maps\n"); return 1; } for (p = maps; (v = *p) != NULL; p++) { printf("Type = %s, Channels = %d\n", snd_pcm_chmap_type_name(v->type), v->map.channels); print_channels(&v->map); } snd_pcm_free_chmaps(maps); return 0; }
bool ALSAWriter::processParams(bool *paramsCorrected) { const unsigned chn = getParam("chn").toUInt(); const unsigned rate = getParam("rate").toUInt(); const bool resetAudio = channels != chn || sample_rate != rate; channels = chn; sample_rate = rate; if (resetAudio || err) { snd_pcm_hw_params_t *params; snd_pcm_hw_params_alloca(¶ms); close(); QString chosenDevName = devName; if (autoFindMultichannelDevice && channels > 2) { bool mustAutoFind = true, forceStereo = false; if (!snd_pcm_open(&snd, chosenDevName.toLocal8Bit(), SND_PCM_STREAM_PLAYBACK, 0)) { if (snd_pcm_type(snd) == SND_PCM_TYPE_HW) { unsigned max_chn = 0; snd_pcm_hw_params_any(snd, params); mustAutoFind = snd_pcm_hw_params_get_channels_max(params, &max_chn) || max_chn < channels; } #ifdef HAVE_CHMAP else if (paramsCorrected) { snd_pcm_chmap_query_t **chmaps = snd_pcm_query_chmaps(snd); if (chmaps) snd_pcm_free_chmaps(chmaps); else forceStereo = true; } #endif snd_pcm_close(snd); snd = NULL; } if (mustAutoFind) { QString newDevName; if (channels <= 4) newDevName = "surround40"; else if (channels <= 6) newDevName = "surround51"; else newDevName = "surround71"; if (!newDevName.isEmpty() && newDevName != chosenDevName) { if (ALSACommon::getDevices().first.contains(newDevName)) chosenDevName = newDevName; else if (forceStereo) { channels = 2; *paramsCorrected = true; } } } } if (!chosenDevName.isEmpty()) { bool sndOpen = !snd_pcm_open(&snd, chosenDevName.toLocal8Bit(), SND_PCM_STREAM_PLAYBACK, 0); if (devName != chosenDevName) { if (sndOpen) QMPlay2Core.logInfo("ALSA :: " + devName + "\" -> \"" + chosenDevName + "\""); else { sndOpen = !snd_pcm_open(&snd, devName.toLocal8Bit(), SND_PCM_STREAM_PLAYBACK, 0); QMPlay2Core.logInfo("ALSA :: " + tr("Cannot open") + " \"" + chosenDevName + "\", " + tr("back to") + " \"" + devName + "\""); } } if (sndOpen) { snd_pcm_hw_params_any(snd, params); snd_pcm_format_t fmt = SND_PCM_FORMAT_UNKNOWN; if (!snd_pcm_hw_params_test_format(snd, params, SND_PCM_FORMAT_S32)) { fmt = SND_PCM_FORMAT_S32; sample_size = 4; } else if (!snd_pcm_hw_params_test_format(snd, params, SND_PCM_FORMAT_S16)) { fmt = SND_PCM_FORMAT_S16; sample_size = 2; } else if (!snd_pcm_hw_params_test_format(snd, params, SND_PCM_FORMAT_S8)) { fmt = SND_PCM_FORMAT_S8; sample_size = 1; } unsigned delay_us = round(delay * 1000000.0); if (fmt != SND_PCM_FORMAT_UNKNOWN && set_snd_pcm_hw_params(snd, params, fmt, channels, sample_rate, delay_us)) { bool err2 = false; if (channels != chn || sample_rate != rate) { if (paramsCorrected) *paramsCorrected = true; else err2 = true; } if (!err2) { err2 = snd_pcm_hw_params(snd, params); if (err2 && paramsCorrected) //jakiś błąd, próba zmiany sample_rate { snd_pcm_hw_params_any(snd, params); err2 = snd_pcm_hw_params_set_rate_resample(snd, params, false) || !set_snd_pcm_hw_params(snd, params, fmt, channels, sample_rate, delay_us) || snd_pcm_hw_params(snd, params); if (!err2) *paramsCorrected = true; } if (!err2) { modParam("delay", delay_us / 1000000.0); if (paramsCorrected && *paramsCorrected) { modParam("chn", channels); modParam("rate", sample_rate); } canPause = snd_pcm_hw_params_can_pause(params) && snd_pcm_hw_params_can_resume(params); mustSwapChn = channels == 6 || channels == 8; #ifdef HAVE_CHMAP if (mustSwapChn) { snd_pcm_chmap_query_t **chmaps = snd_pcm_query_chmaps(snd); if (chmaps) { for (int i = 0; chmaps[i]; ++i) { if (chmaps[i]->map.channels >= channels) { for (uint j = 0; j < channels; ++j) { mustSwapChn &= chmaps[i]->map.pos[j] == j + SND_CHMAP_FL; if (!mustSwapChn) break; } break; } } snd_pcm_free_chmaps(chmaps); } } #endif return true; } } } } } err = true; QMPlay2Core.logError("ALSA :: " + tr("Cannot open audio output stream")); } return readyWrite(); }