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/* |
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* Linux audio play and grab interface |
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* Copyright (c) 2000, 2001 Fabrice Bellard |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg 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 GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "config.h" |
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#include <string.h> |
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#if HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif |
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#include <fcntl.h> |
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#include <sys/ioctl.h> |
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#include <sys/soundcard.h> |
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#include "libavutil/log.h" |
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#include "libavcodec/avcodec.h" |
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#include "avdevice.h" |
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#include "oss.h" |
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int ff_oss_audio_open(AVFormatContext *s1, int is_output, |
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const char *audio_device) |
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{ |
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OSSAudioData *s = s1->priv_data; |
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int audio_fd; |
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int tmp, err; |
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char *flip = getenv("AUDIO_FLIP_LEFT"); |
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if (is_output) |
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audio_fd = avpriv_open(audio_device, O_WRONLY); |
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else |
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audio_fd = avpriv_open(audio_device, O_RDONLY); |
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if (audio_fd < 0) { |
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av_log(s1, AV_LOG_ERROR, "%s: %s\n", audio_device, av_err2str(AVERROR(errno))); |
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return AVERROR(EIO); |
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} |
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if (flip && *flip == '1') { |
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s->flip_left = 1; |
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} |
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/* non blocking mode */ |
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if (!is_output) { |
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if (fcntl(audio_fd, F_SETFL, O_NONBLOCK) < 0) { |
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av_log(s1, AV_LOG_WARNING, "%s: Could not enable non block mode (%s)\n", audio_device, av_err2str(AVERROR(errno))); |
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} |
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} |
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s->frame_size = OSS_AUDIO_BLOCK_SIZE; |
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#define CHECK_IOCTL_ERROR(event) \ |
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if (err < 0) { \ |
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av_log(s1, AV_LOG_ERROR, #event ": %s\n", av_err2str(AVERROR(errno)));\ |
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goto fail; \ |
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} |
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/* select format : favour native format |
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* We don't CHECK_IOCTL_ERROR here because even if failed OSS still may be |
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* usable. If OSS is not usable the SNDCTL_DSP_SETFMTS later is going to |
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* fail anyway. */ |
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err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp); |
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if (err < 0) { |
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av_log(s1, AV_LOG_WARNING, "SNDCTL_DSP_GETFMTS: %s\n", av_err2str(AVERROR(errno))); |
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} |
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#if HAVE_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 = AV_CODEC_ID_PCM_S16LE; |
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break; |
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case AFMT_S16_BE: |
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s->codec_id = AV_CODEC_ID_PCM_S16BE; |
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break; |
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default: |
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av_log(s1, AV_LOG_ERROR, "Soundcard does not support 16 bit sample format\n"); |
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close(audio_fd); |
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return AVERROR(EIO); |
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} |
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err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp); |
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CHECK_IOCTL_ERROR(SNDCTL_DSP_SETFMTS) |
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tmp = (s->channels == 2); |
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err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp); |
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CHECK_IOCTL_ERROR(SNDCTL_DSP_STEREO) |
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tmp = s->sample_rate; |
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err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp); |
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CHECK_IOCTL_ERROR(SNDCTL_DSP_SPEED) |
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s->sample_rate = tmp; /* store real sample rate */ |
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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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return AVERROR(EIO); |
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#undef CHECK_IOCTL_ERROR |
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} |
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int ff_oss_audio_close(OSSAudioData *s) |
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{ |
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close(s->fd); |
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return 0; |
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} |