/* * Linux audio play and grab interface * Copyright (c) 2000, 2001 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "config.h" #include <string.h> #if HAVE_UNISTD_H #include <unistd.h> #endif #include <fcntl.h> #include <sys/ioctl.h> #include <sys/soundcard.h> #include "libavutil/log.h" #include "avdevice.h" #include "oss.h" int ff_oss_audio_open(AVFormatContext *s1, int is_output, const char *audio_device) { OSSAudioData *s = s1->priv_data; int audio_fd; int tmp, err; char *flip = getenv("AUDIO_FLIP_LEFT"); if (is_output) audio_fd = avpriv_open(audio_device, O_WRONLY); else audio_fd = avpriv_open(audio_device, O_RDONLY); if (audio_fd < 0) { av_log(s1, AV_LOG_ERROR, "%s: %s\n", audio_device, av_err2str(AVERROR(errno))); return AVERROR(EIO); } if (flip && *flip == '1') { s->flip_left = 1; } /* non blocking mode */ if (!is_output) { if (fcntl(audio_fd, F_SETFL, O_NONBLOCK) < 0) { av_log(s1, AV_LOG_WARNING, "%s: Could not enable non block mode (%s)\n", audio_device, av_err2str(AVERROR(errno))); } } s->frame_size = OSS_AUDIO_BLOCK_SIZE; #define CHECK_IOCTL_ERROR(event) \ if (err < 0) { \ av_log(s1, AV_LOG_ERROR, #event ": %s\n", av_err2str(AVERROR(errno)));\ goto fail; \ } /* select format : favour native format * We don't CHECK_IOCTL_ERROR here because even if failed OSS still may be * usable. If OSS is not usable the SNDCTL_DSP_SETFMTS later is going to * fail anyway. */ err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp); if (err < 0) { av_log(s1, AV_LOG_WARNING, "SNDCTL_DSP_GETFMTS: %s\n", av_err2str(AVERROR(errno))); } #if HAVE_BIGENDIAN if (tmp & AFMT_S16_BE) { tmp = AFMT_S16_BE; } else if (tmp & AFMT_S16_LE) { tmp = AFMT_S16_LE; } else { tmp = 0; } #else if (tmp & AFMT_S16_LE) { tmp = AFMT_S16_LE; } else if (tmp & AFMT_S16_BE) { tmp = AFMT_S16_BE; } else { tmp = 0; } #endif switch(tmp) { case AFMT_S16_LE: s->codec_id = AV_CODEC_ID_PCM_S16LE; break; case AFMT_S16_BE: s->codec_id = AV_CODEC_ID_PCM_S16BE; break; default: av_log(s1, AV_LOG_ERROR, "Soundcard does not support 16 bit sample format\n"); close(audio_fd); return AVERROR(EIO); } err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp); CHECK_IOCTL_ERROR(SNDCTL_DSP_SETFMTS) tmp = (s->channels == 2); err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp); CHECK_IOCTL_ERROR(SNDCTL_DSP_STEREO) tmp = s->sample_rate; err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp); CHECK_IOCTL_ERROR(SNDCTL_DSP_SPEED) s->sample_rate = tmp; /* store real sample rate */ s->fd = audio_fd; return 0; fail: close(audio_fd); return AVERROR(EIO); #undef CHECK_IOCTL_ERROR } int ff_oss_audio_close(OSSAudioData *s) { close(s->fd); return 0; }