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oss_audio: use a macro to simplify ioctl() error checking 

Also add a note about SNDCTL_DSP_GETFMTS which may fail even if OSS is
available.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Timothy Gu 2014-07-18 14:56:16 -07:00 committed by Michael Niedermayer
parent e1e3ec9b02
commit 69c7aad494
1 changed files with 14 additions and 13 deletions
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27
libavdevice/oss_audio.c
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@ -87,7 +87,16 @@ static int audio_open(AVFormatContext *s1, int is_output, const char *audio_devi
s->frame_size = AUDIO_BLOCK_SIZE;
/* select format : favour native format */
#define CHECK_IOCTL_ERROR(event) \
if (err < 0) { \
av_log(s1, AV_LOG_ERROR, #event ": %s\n", strerror(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 =` kept to eliminate compiler warning. */
err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp);
#if HAVE_BIGENDIAN
@ -121,24 +130,15 @@ static int audio_open(AVFormatContext *s1, int is_output, const char *audio_devi
return AVERROR(EIO);
}
err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp);
if (err < 0) {
av_log(s1, AV_LOG_ERROR, "SNDCTL_DSP_SETFMT: %s\n", strerror(errno));
goto fail;
}
CHECK_IOCTL_ERROR(SNDCTL_DSP_SETFMTS)
tmp = (s->channels == 2);
err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
if (err < 0) {
av_log(s1, AV_LOG_ERROR, "SNDCTL_DSP_STEREO: %s\n", strerror(errno));
goto fail;
}
CHECK_IOCTL_ERROR(SNDCTL_DSP_STEREO)
tmp = s->sample_rate;
err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp);
if (err < 0) {
av_log(s1, AV_LOG_ERROR, "SNDCTL_DSP_SPEED: %s\n", strerror(errno));
goto fail;
}
CHECK_IOCTL_ERROR(SNDCTL_DSP_SPEED)
s->sample_rate = tmp; /* store real sample rate */
s->fd = audio_fd;
@ -146,6 +146,7 @@ static int audio_open(AVFormatContext *s1, int is_output, const char *audio_devi
fail:
close(audio_fd);
return AVERROR(EIO);
#undef CHECK_IOCTL_ERROR
}
static int audio_close(AudioData *s)