diff options
Diffstat (limited to 'libavdevice/oss.c')
| -rw-r--r-- | libavdevice/oss.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/libavdevice/oss.c b/libavdevice/oss.c new file mode 100644 index 0000000000..eb8d454422 --- /dev/null +++ b/libavdevice/oss.c @@ -0,0 +1,139 @@ +/* + * Linux audio play and grab interface + * Copyright (c) 2000, 2001 Fabrice Bellard + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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_SOUNDCARD_H +#include <soundcard.h> +#else +#include <sys/soundcard.h> +#endif + +#include <unistd.h> +#include <fcntl.h> +#include <sys/ioctl.h> + +#include "libavutil/log.h" + +#include "libavcodec/avcodec.h" + +#include "libavformat/avformat.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"); + char errbuff[128]; + + 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, strerror(errno)); + return AVERROR(EIO); + } + + if (flip && *flip == '1') { + s->flip_left = 1; + } + + /* non blocking mode */ + if (!is_output) + fcntl(audio_fd, F_SETFL, O_NONBLOCK); + + s->frame_size = OSS_AUDIO_BLOCK_SIZE; + +#define CHECK_IOCTL_ERROR(event) \ + if (err < 0) { \ + av_strerror(AVERROR(errno), errbuff, sizeof(errbuff)); \ + av_log(s1, AV_LOG_ERROR, #event ": %s\n", errbuff); \ + 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. */ + (void) ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp); + +#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; +} |