mirror of
https://github.com/mpv-player/mpv
synced 2024-12-22 23:02:37 +00:00
b745c2d005
Until now, the audio chain could handle both little endian and big endian formats. This actually doesn't make much sense, since the audio API and the HW will most likely prefer native formats. Or at the very least, it should be trivial for audio drivers to do the byte swapping themselves. From now on, the audio chain contains native-endian formats only. All AOs and some filters are adjusted. af_convertsignendian.c is now wrongly named, but the filter name is adjusted. In some cases, the audio infrastructure was reused on the demuxer side, but that is relatively easy to rectify. This is a quite intrusive and radical change. It's possible that it will break some things (especially if they're obscure or not Linux), so watch out for regressions. It's probably still better to do it the bulldozer way, since slow transition and researching foreign platforms would take a lot of time and effort.
197 lines
6.2 KiB
C
197 lines
6.2 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 "common/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_ERR(ai, "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_ERR(ai, "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);
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if (err < 0) {
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MP_ERR(ai, "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_ERR(ai, "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_ERR(ai, "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_ERR(ai, "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_ERR(ai, "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_ERR(ai, "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_ERR(ai, "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_ERR(ai, "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(ai->log, 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);
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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_ERR(ai, "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_ERR(ai, "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_ERR(ai, "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(ai->log, MSGL_V)) {
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MP_ERR(ai, "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_ERR(ai, "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_ERR(ai, "ALSA read/write error");
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return -1;
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}
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