2001-07-22 14:18:56 +00:00
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/*
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* Linux audio play and grab interface
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2002-05-25 22:34:32 +00:00
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* Copyright (c) 2000, 2001 Fabrice Bellard.
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2001-07-22 14:18:56 +00:00
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*
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2002-05-25 22:34:32 +00:00
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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2001-07-22 14:18:56 +00:00
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*
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2002-05-25 22:34:32 +00:00
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* This library is distributed in the hope that it will be useful,
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2001-07-22 14:18:56 +00:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2002-05-25 22:34:32 +00:00
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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2001-07-22 14:18:56 +00:00
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*
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2002-05-25 22:34:32 +00:00
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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2006-01-12 22:43:26 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2001-07-22 14:18:56 +00:00
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*/
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2001-08-13 21:37:10 +00:00
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#include "avformat.h"
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2001-07-22 14:18:56 +00:00
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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2005-05-09 13:24:23 +00:00
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#ifdef __OpenBSD__
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#include <soundcard.h>
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#else
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2002-05-26 15:09:58 +00:00
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#include <sys/soundcard.h>
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2005-05-09 13:24:23 +00:00
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#endif
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2001-07-22 14:18:56 +00:00
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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2001-09-24 23:27:06 +00:00
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#define AUDIO_BLOCK_SIZE 4096
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2001-07-22 14:18:56 +00:00
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typedef struct {
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int fd;
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2001-09-24 23:27:06 +00:00
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int sample_rate;
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2001-07-22 14:18:56 +00:00
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int channels;
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2001-09-24 23:27:06 +00:00
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int frame_size; /* in bytes ! */
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int codec_id;
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2002-05-09 01:15:21 +00:00
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int flip_left : 1;
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2003-02-11 16:35:48 +00:00
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uint8_t buffer[AUDIO_BLOCK_SIZE];
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2001-09-24 23:27:06 +00:00
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int buffer_ptr;
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2001-07-22 14:18:56 +00:00
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} AudioData;
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2003-01-23 10:33:16 +00:00
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static int audio_open(AudioData *s, int is_output, const char *audio_device)
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2001-07-22 14:18:56 +00:00
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{
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2001-09-24 23:27:06 +00:00
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int audio_fd;
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2001-07-22 14:18:56 +00:00
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int tmp, err;
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2002-05-09 01:15:21 +00:00
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char *flip = getenv("AUDIO_FLIP_LEFT");
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2001-07-22 14:18:56 +00:00
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/* open linux audio device */
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2003-01-23 10:33:16 +00:00
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if (!audio_device)
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2005-05-09 13:24:23 +00:00
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#ifdef __OpenBSD__
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2005-12-22 01:10:11 +00:00
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audio_device = "/dev/sound";
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2005-05-09 13:24:23 +00:00
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#else
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2003-01-23 10:33:16 +00:00
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audio_device = "/dev/dsp";
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2005-05-09 13:24:23 +00:00
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#endif
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2003-01-23 10:33:16 +00:00
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2001-09-24 23:27:06 +00:00
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if (is_output)
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audio_fd = open(audio_device, O_WRONLY);
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2001-07-22 14:18:56 +00:00
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else
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2001-09-24 23:27:06 +00:00
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audio_fd = open(audio_device, O_RDONLY);
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2001-07-22 14:18:56 +00:00
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if (audio_fd < 0) {
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perror(audio_device);
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2004-06-19 03:59:34 +00:00
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return AVERROR_IO;
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2001-07-22 14:18:56 +00:00
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}
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2002-05-09 01:15:21 +00:00
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if (flip && *flip == '1') {
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s->flip_left = 1;
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}
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2001-07-22 14:18:56 +00:00
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/* non blocking mode */
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2002-11-19 18:21:18 +00:00
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if (!is_output)
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fcntl(audio_fd, F_SETFL, O_NONBLOCK);
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2001-07-22 14:18:56 +00:00
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2001-09-24 23:27:06 +00:00
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s->frame_size = AUDIO_BLOCK_SIZE;
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2001-07-22 14:18:56 +00:00
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#if 0
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2001-09-24 23:27:06 +00:00
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tmp = (NB_FRAGMENTS << 16) | FRAGMENT_BITS;
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err = ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &tmp);
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2001-07-22 14:18:56 +00:00
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|
if (err < 0) {
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perror("SNDCTL_DSP_SETFRAGMENT");
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}
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#endif
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2001-09-24 23:27:06 +00:00
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/* select format : favour native format */
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err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp);
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2005-12-17 18:14:38 +00:00
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2001-09-24 23:27:06 +00:00
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#ifdef WORDS_BIGENDIAN
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if (tmp & AFMT_S16_BE) {
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tmp = AFMT_S16_BE;
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} else if (tmp & AFMT_S16_LE) {
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tmp = AFMT_S16_LE;
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} else {
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tmp = 0;
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}
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#else
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if (tmp & AFMT_S16_LE) {
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tmp = AFMT_S16_LE;
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} else if (tmp & AFMT_S16_BE) {
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tmp = AFMT_S16_BE;
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} else {
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tmp = 0;
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}
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#endif
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switch(tmp) {
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case AFMT_S16_LE:
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s->codec_id = CODEC_ID_PCM_S16LE;
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break;
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case AFMT_S16_BE:
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s->codec_id = CODEC_ID_PCM_S16BE;
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break;
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default:
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2004-03-03 15:41:21 +00:00
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av_log(NULL, AV_LOG_ERROR, "Soundcard does not support 16 bit sample format\n");
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2001-09-24 23:27:06 +00:00
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close(audio_fd);
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2004-06-19 03:59:34 +00:00
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return AVERROR_IO;
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2001-09-24 23:27:06 +00:00
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}
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err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp);
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2001-07-22 14:18:56 +00:00
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if (err < 0) {
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perror("SNDCTL_DSP_SETFMT");
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goto fail;
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}
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2005-12-17 18:14:38 +00:00
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2001-09-24 23:27:06 +00:00
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tmp = (s->channels == 2);
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err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
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2001-07-22 14:18:56 +00:00
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if (err < 0) {
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perror("SNDCTL_DSP_STEREO");
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goto fail;
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}
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2002-05-09 01:15:21 +00:00
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if (tmp)
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s->channels = 2;
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2005-12-17 18:14:38 +00:00
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2001-09-24 23:27:06 +00:00
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tmp = s->sample_rate;
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err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp);
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2001-07-22 14:18:56 +00:00
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if (err < 0) {
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perror("SNDCTL_DSP_SPEED");
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goto fail;
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}
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2001-09-24 23:27:06 +00:00
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s->sample_rate = tmp; /* store real sample rate */
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2001-07-22 14:18:56 +00:00
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s->fd = audio_fd;
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return 0;
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fail:
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close(audio_fd);
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2004-06-19 03:59:34 +00:00
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return AVERROR_IO;
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2001-07-22 14:18:56 +00:00
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}
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2001-09-24 23:27:06 +00:00
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static int audio_close(AudioData *s)
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2001-07-22 14:18:56 +00:00
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{
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close(s->fd);
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2001-09-24 23:27:06 +00:00
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return 0;
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}
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/* sound output support */
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static int audio_write_header(AVFormatContext *s1)
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{
|
2002-05-20 16:31:13 +00:00
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AudioData *s = s1->priv_data;
|
2001-09-24 23:27:06 +00:00
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AVStream *st;
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int ret;
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st = s1->streams[0];
|
2005-07-17 22:24:36 +00:00
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s->sample_rate = st->codec->sample_rate;
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s->channels = st->codec->channels;
|
2003-01-23 10:33:16 +00:00
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ret = audio_open(s, 1, NULL);
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2001-09-24 23:27:06 +00:00
|
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if (ret < 0) {
|
2004-06-19 03:59:34 +00:00
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return AVERROR_IO;
|
2001-09-24 23:27:06 +00:00
|
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} else {
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return 0;
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}
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}
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|
|
2004-05-29 02:06:32 +00:00
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static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
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2001-09-24 23:27:06 +00:00
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{
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AudioData *s = s1->priv_data;
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int len, ret;
|
2004-05-29 02:06:32 +00:00
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int size= pkt->size;
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uint8_t *buf= pkt->data;
|
2001-09-24 23:27:06 +00:00
|
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while (size > 0) {
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len = AUDIO_BLOCK_SIZE - s->buffer_ptr;
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if (len > size)
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len = size;
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memcpy(s->buffer + s->buffer_ptr, buf, len);
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s->buffer_ptr += len;
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if (s->buffer_ptr >= AUDIO_BLOCK_SIZE) {
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for(;;) {
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ret = write(s->fd, s->buffer, AUDIO_BLOCK_SIZE);
|
2002-11-19 18:21:18 +00:00
|
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if (ret > 0)
|
2001-09-24 23:27:06 +00:00
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break;
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if (ret < 0 && (errno != EAGAIN && errno != EINTR))
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2004-06-19 03:59:34 +00:00
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return AVERROR_IO;
|
2001-09-24 23:27:06 +00:00
|
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}
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|
|
s->buffer_ptr = 0;
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|
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}
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buf += len;
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size -= len;
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}
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return 0;
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}
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static int audio_write_trailer(AVFormatContext *s1)
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|
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{
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AudioData *s = s1->priv_data;
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audio_close(s);
|
2001-07-22 14:18:56 +00:00
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return 0;
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}
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2001-09-24 23:27:06 +00:00
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/* grab support */
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static int audio_read_header(AVFormatContext *s1, AVFormatParameters *ap)
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|
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{
|
2002-05-20 16:31:13 +00:00
|
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AudioData *s = s1->priv_data;
|
2001-09-24 23:27:06 +00:00
|
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AVStream *st;
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int ret;
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|
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if (!ap || ap->sample_rate <= 0 || ap->channels <= 0)
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return -1;
|
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|
2002-05-20 16:31:13 +00:00
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st = av_new_stream(s1, 0);
|
2001-09-24 23:27:06 +00:00
|
|
|
if (!st) {
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|
|
return -ENOMEM;
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|
|
|
}
|
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|
s->sample_rate = ap->sample_rate;
|
|
|
|
s->channels = ap->channels;
|
|
|
|
|
2003-01-23 10:33:16 +00:00
|
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|
ret = audio_open(s, 0, ap->device);
|
2001-09-24 23:27:06 +00:00
|
|
|
if (ret < 0) {
|
2002-05-18 23:11:09 +00:00
|
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|
av_free(st);
|
2004-06-19 03:59:34 +00:00
|
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|
return AVERROR_IO;
|
2001-09-24 23:27:06 +00:00
|
|
|
}
|
2002-11-19 15:52:29 +00:00
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|
|
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|
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/* take real parameters */
|
2005-07-17 22:24:36 +00:00
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st->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
|
|
st->codec->codec_id = s->codec_id;
|
|
|
|
st->codec->sample_rate = s->sample_rate;
|
|
|
|
st->codec->channels = s->channels;
|
2002-11-19 15:52:29 +00:00
|
|
|
|
2006-02-01 11:31:33 +00:00
|
|
|
av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
|
2002-11-19 15:52:29 +00:00
|
|
|
return 0;
|
2001-09-24 23:27:06 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
|
|
|
|
{
|
|
|
|
AudioData *s = s1->priv_data;
|
2002-11-19 15:52:29 +00:00
|
|
|
int ret, bdelay;
|
|
|
|
int64_t cur_time;
|
|
|
|
struct audio_buf_info abufi;
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2001-09-24 23:27:06 +00:00
|
|
|
if (av_new_packet(pkt, s->frame_size) < 0)
|
2004-06-19 03:59:34 +00:00
|
|
|
return AVERROR_IO;
|
2001-09-24 23:27:06 +00:00
|
|
|
for(;;) {
|
2003-02-05 01:59:52 +00:00
|
|
|
struct timeval tv;
|
|
|
|
fd_set fds;
|
|
|
|
|
|
|
|
tv.tv_sec = 0;
|
|
|
|
tv.tv_usec = 30 * 1000; /* 30 msecs -- a bit shorter than 1 frame at 30fps */
|
|
|
|
|
|
|
|
FD_ZERO(&fds);
|
|
|
|
FD_SET(s->fd, &fds);
|
|
|
|
|
|
|
|
/* This will block until data is available or we get a timeout */
|
|
|
|
(void) select(s->fd + 1, &fds, 0, 0, &tv);
|
|
|
|
|
2001-09-24 23:27:06 +00:00
|
|
|
ret = read(s->fd, pkt->data, pkt->size);
|
|
|
|
if (ret > 0)
|
|
|
|
break;
|
2002-04-08 20:58:56 +00:00
|
|
|
if (ret == -1 && (errno == EAGAIN || errno == EINTR)) {
|
|
|
|
av_free_packet(pkt);
|
|
|
|
pkt->size = 0;
|
2006-02-01 11:31:33 +00:00
|
|
|
pkt->pts = av_gettime();
|
2002-04-08 20:58:56 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2001-09-24 23:27:06 +00:00
|
|
|
if (!(ret == 0 || (ret == -1 && (errno == EAGAIN || errno == EINTR)))) {
|
|
|
|
av_free_packet(pkt);
|
2004-06-19 03:59:34 +00:00
|
|
|
return AVERROR_IO;
|
2001-09-24 23:27:06 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
pkt->size = ret;
|
2002-11-19 15:52:29 +00:00
|
|
|
|
|
|
|
/* compute pts of the start of the packet */
|
|
|
|
cur_time = av_gettime();
|
|
|
|
bdelay = ret;
|
|
|
|
if (ioctl(s->fd, SNDCTL_DSP_GETISPACE, &abufi) == 0) {
|
|
|
|
bdelay += abufi.bytes;
|
|
|
|
}
|
|
|
|
/* substract time represented by the number of bytes in the audio fifo */
|
|
|
|
cur_time -= (bdelay * 1000000LL) / (s->sample_rate * s->channels);
|
|
|
|
|
|
|
|
/* convert to wanted units */
|
2006-02-01 11:31:33 +00:00
|
|
|
pkt->pts = cur_time;
|
2002-11-19 15:52:29 +00:00
|
|
|
|
2002-05-09 01:15:21 +00:00
|
|
|
if (s->flip_left && s->channels == 2) {
|
|
|
|
int i;
|
|
|
|
short *p = (short *) pkt->data;
|
|
|
|
|
|
|
|
for (i = 0; i < ret; i += 4) {
|
|
|
|
*p = ~*p;
|
|
|
|
p += 2;
|
|
|
|
}
|
|
|
|
}
|
2001-09-24 23:27:06 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int audio_read_close(AVFormatContext *s1)
|
|
|
|
{
|
|
|
|
AudioData *s = s1->priv_data;
|
|
|
|
|
|
|
|
audio_close(s);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2002-11-11 09:07:32 +00:00
|
|
|
static AVInputFormat audio_in_format = {
|
2002-05-20 16:31:13 +00:00
|
|
|
"audio_device",
|
|
|
|
"audio grab and output",
|
|
|
|
sizeof(AudioData),
|
|
|
|
NULL,
|
|
|
|
audio_read_header,
|
|
|
|
audio_read_packet,
|
|
|
|
audio_read_close,
|
2002-10-06 23:06:06 +00:00
|
|
|
.flags = AVFMT_NOFILE,
|
2002-05-20 16:31:13 +00:00
|
|
|
};
|
|
|
|
|
2002-11-11 09:07:32 +00:00
|
|
|
static AVOutputFormat audio_out_format = {
|
2001-09-24 23:27:06 +00:00
|
|
|
"audio_device",
|
|
|
|
"audio grab and output",
|
|
|
|
"",
|
|
|
|
"",
|
2002-05-20 16:31:13 +00:00
|
|
|
sizeof(AudioData),
|
2001-09-24 23:27:06 +00:00
|
|
|
/* XXX: we make the assumption that the soundcard accepts this format */
|
|
|
|
/* XXX: find better solution with "preinit" method, needed also in
|
|
|
|
other formats */
|
|
|
|
#ifdef WORDS_BIGENDIAN
|
|
|
|
CODEC_ID_PCM_S16BE,
|
|
|
|
#else
|
|
|
|
CODEC_ID_PCM_S16LE,
|
|
|
|
#endif
|
|
|
|
CODEC_ID_NONE,
|
|
|
|
audio_write_header,
|
|
|
|
audio_write_packet,
|
|
|
|
audio_write_trailer,
|
2002-10-06 23:06:06 +00:00
|
|
|
.flags = AVFMT_NOFILE,
|
2001-07-22 14:18:56 +00:00
|
|
|
};
|
2002-05-20 16:31:13 +00:00
|
|
|
|
|
|
|
int audio_init(void)
|
|
|
|
{
|
|
|
|
av_register_input_format(&audio_in_format);
|
|
|
|
av_register_output_format(&audio_out_format);
|
|
|
|
return 0;
|
|
|
|
}
|