mirror of
https://github.com/mpv-player/mpv
synced 2024-12-25 08:12:17 +00:00
d8896f0dba
It's true that ALSA uses alloca() in some of its API functions, but since this is hidden behind macros in the ALSA headers, we have no reason to include alloca.h ourselves. Might help with portability (FreeBSD).
197 lines
6.0 KiB
C
197 lines
6.0 KiB
C
/*
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* This file is part of MPlayer.
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*
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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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*
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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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*
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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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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include "config.h"
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#include <alsa/asoundlib.h>
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#include "audio_in.h"
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#include "mpvcore/mp_msg.h"
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int ai_alsa_setup(audio_in_t *ai)
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{
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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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int err;
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int dir;
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unsigned int rate;
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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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if (err < 0) {
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mp_tmsg(MSGT_TV, MSGL_ERR, "Broken configuration for this PCM: no configurations available.\n");
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return -1;
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}
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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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if (err < 0) {
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mp_tmsg(MSGT_TV, MSGL_ERR, "Access type not available.\n");
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return -1;
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}
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err = snd_pcm_hw_params_set_format(ai->alsa.handle, params, SND_PCM_FORMAT_S16_LE);
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if (err < 0) {
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mp_tmsg(MSGT_TV, MSGL_ERR, "Sample format not available.\n");
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return -1;
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}
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err = snd_pcm_hw_params_set_channels(ai->alsa.handle, params, ai->req_channels);
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if (err < 0) {
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snd_pcm_hw_params_get_channels(params, &ai->channels);
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mp_tmsg(MSGT_TV, MSGL_ERR, "Channel count not available - reverting to default: %d\n",
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ai->channels);
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} else {
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ai->channels = ai->req_channels;
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}
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dir = 0;
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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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if (err < 0) {
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mp_tmsg(MSGT_TV, MSGL_ERR, "Cannot set samplerate.\n");
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}
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ai->samplerate = rate;
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dir = 0;
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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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if (err < 0) {
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mp_tmsg(MSGT_TV, MSGL_ERR, "Cannot set buffer time.\n");
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}
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dir = 0;
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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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if (err < 0) {
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mp_tmsg(MSGT_TV, MSGL_ERR, "Cannot set period time.\n");
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}
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err = snd_pcm_hw_params(ai->alsa.handle, params);
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if (err < 0) {
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mp_tmsg(MSGT_TV, MSGL_ERR, "Unable to install hardware parameters: %s", snd_strerror(err));
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snd_pcm_hw_params_dump(params, ai->alsa.log);
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return -1;
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}
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dir = -1;
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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_tmsg(MSGT_TV, MSGL_ERR, "Can't use period equal to buffer size (%u == %lu)\n", ai->alsa.chunk_size, (long)buffer_size);
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return -1;
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}
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snd_pcm_sw_params_current(ai->alsa.handle, swparams);
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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_tmsg(MSGT_TV, MSGL_ERR, "Unable to install software parameters:\n");
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snd_pcm_sw_params_dump(swparams, ai->alsa.log);
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return -1;
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}
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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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}
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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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return 0;
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}
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int ai_alsa_init(audio_in_t *ai)
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{
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int err;
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err = snd_pcm_open(&ai->alsa.handle, ai->alsa.device, SND_PCM_STREAM_CAPTURE, 0);
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if (err < 0) {
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mp_tmsg(MSGT_TV, MSGL_ERR, "Error opening audio: %s\n", snd_strerror(err));
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return -1;
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}
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err = snd_output_stdio_attach(&ai->alsa.log, stderr, 0);
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if (err < 0) {
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return -1;
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}
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err = ai_alsa_setup(ai);
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return err;
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}
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#ifndef timersub
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#define timersub(a, b, result) \
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do { \
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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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} \
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} while (0)
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#endif
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int ai_alsa_xrun(audio_in_t *ai)
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{
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snd_pcm_status_t *status;
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int res;
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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_tmsg(MSGT_TV, MSGL_ERR, "ALSA status error: %s", snd_strerror(res));
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return -1;
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}
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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_tmsg(MSGT_TV, MSGL_ERR, "ALSA xrun!!! (at least %.3f ms long)\n",
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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_tmsg(MSGT_TV, MSGL_ERR, "ALSA Status:\n");
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snd_pcm_status_dump(status, ai->alsa.log);
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}
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if ((res = snd_pcm_prepare(ai->alsa.handle))<0) {
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mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA xrun: prepare error: %s", snd_strerror(res));
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return -1;
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}
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return 0; /* ok, data should be accepted again */
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}
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mp_tmsg(MSGT_TV, MSGL_ERR, "ALSA read/write error");
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return -1;
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}
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