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* This file is part of MPlayer.
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#include <alsa/asoundlib.h>
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int ai_alsa_setup(audio_in_t *ai)
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snd_pcm_hw_params_t *params;
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snd_pcm_sw_params_t *swparams;
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snd_pcm_uframes_t buffer_size, period_size;
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snd_pcm_hw_params_alloca(¶ms);
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snd_pcm_sw_params_alloca(&swparams);
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err = snd_pcm_hw_params_any(ai->alsa.handle, params);
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_PcmBrokenConfig);
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err = snd_pcm_hw_params_set_access(ai->alsa.handle, params,
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SND_PCM_ACCESS_RW_INTERLEAVED);
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_UnavailableAccessType);
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err = snd_pcm_hw_params_set_format(ai->alsa.handle, params, SND_PCM_FORMAT_S16_LE);
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_UnavailableSampleFmt);
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err = snd_pcm_hw_params_set_channels(ai->alsa.handle, params, ai->req_channels);
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snd_pcm_hw_params_get_channels(params, &ai->channels);
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_UnavailableChanCount,
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ai->channels = ai->req_channels;
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rate = ai->req_samplerate;
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err = snd_pcm_hw_params_set_rate_near(ai->alsa.handle, params, &rate, &dir);
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA1X_CannotSetSamplerate);
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ai->samplerate = rate;
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ai->alsa.buffer_time = 1000000;
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err = snd_pcm_hw_params_set_buffer_time_near(ai->alsa.handle, params,
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&ai->alsa.buffer_time, &dir);
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA1X_CannotSetBufferTime);
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ai->alsa.period_time = ai->alsa.buffer_time / 4;
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err = snd_pcm_hw_params_set_period_time_near(ai->alsa.handle, params,
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&ai->alsa.period_time, &dir);
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA1X_CannotSetPeriodTime);
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err = snd_pcm_hw_params(ai->alsa.handle, params);
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_CannotInstallHWParams, snd_strerror(err));
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snd_pcm_hw_params_dump(params, ai->alsa.log);
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snd_pcm_hw_params_get_period_size(params, &period_size, &dir);
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snd_pcm_hw_params_get_buffer_size(params, &buffer_size);
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ai->alsa.chunk_size = period_size;
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if (period_size == buffer_size) {
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_PeriodEqualsBufferSize, ai->alsa.chunk_size, (long)buffer_size);
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snd_pcm_sw_params_current(ai->alsa.handle, swparams);
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err = snd_pcm_sw_params_set_sleep_min(ai->alsa.handle, swparams,0);
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err = snd_pcm_sw_params_set_avail_min(ai->alsa.handle, swparams, ai->alsa.chunk_size);
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err = snd_pcm_sw_params_set_start_threshold(ai->alsa.handle, swparams, 0);
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err = snd_pcm_sw_params_set_stop_threshold(ai->alsa.handle, swparams, buffer_size);
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if (snd_pcm_sw_params(ai->alsa.handle, swparams) < 0) {
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_CannotInstallSWParams);
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snd_pcm_sw_params_dump(swparams, ai->alsa.log);
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if (mp_msg_test(MSGT_TV, MSGL_V)) {
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snd_pcm_dump(ai->alsa.handle, ai->alsa.log);
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ai->alsa.bits_per_sample = snd_pcm_format_physical_width(SND_PCM_FORMAT_S16_LE);
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ai->alsa.bits_per_frame = ai->alsa.bits_per_sample * ai->channels;
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ai->blocksize = ai->alsa.chunk_size * ai->alsa.bits_per_frame / 8;
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ai->samplesize = ai->alsa.bits_per_sample;
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ai->bytes_per_sample = ai->alsa.bits_per_sample/8;
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int ai_alsa_init(audio_in_t *ai)
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err = snd_pcm_open(&ai->alsa.handle, ai->alsa.device, SND_PCM_STREAM_CAPTURE, 0);
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_ErrorOpeningAudio, snd_strerror(err));
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err = snd_output_stdio_attach(&ai->alsa.log, stderr, 0);
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err = ai_alsa_setup(ai);
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#define timersub(a, b, result) \
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(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
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(result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
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if ((result)->tv_usec < 0) { \
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--(result)->tv_sec; \
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(result)->tv_usec += 1000000; \
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int ai_alsa_xrun(audio_in_t *ai)
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snd_pcm_status_t *status;
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snd_pcm_status_alloca(&status);
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if ((res = snd_pcm_status(ai->alsa.handle, status))<0) {
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaStatusError, snd_strerror(res));
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if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
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struct timeval now, diff, tstamp;
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gettimeofday(&now, 0);
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snd_pcm_status_get_trigger_tstamp(status, &tstamp);
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timersub(&now, &tstamp, &diff);
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaXRUN,
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diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
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if (mp_msg_test(MSGT_TV, MSGL_V)) {
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaStatus);
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snd_pcm_status_dump(status, ai->alsa.log);
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if ((res = snd_pcm_prepare(ai->alsa.handle))<0) {
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaXRUNPrepareError, snd_strerror(res));
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return 0; /* ok, data should be accepted again */
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mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AIALSA_AlsaReadWriteError);