openharmony/third_party_libsnd
1
0
Fork 0
mirror of https://gitee.com/openharmony/third_party_libsnd synced 2024-11-23 09:59:54 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Improve error handling in code for playback under Linux/ALSA.

Browse Source
This commit is contained in:
Erik de Castro Lopo 2005-05-12 09:54:05 +00:00
parent c72d488e91
commit 7ed5aeda3f
2 changed files with 33 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
ChangeLog
View File

@ -1,7 +1,12 @@
2005-05-12 Erik de Castro Lopo <erikd AT mega-nerd DOT com>
* examples/sndfile-play.c
Improve error handling in code for playback under Linux/ALSA.
2005-05-10 Erik de Castro Lopo <erikd AT mega-nerd DOT com>
* src/ircam.c
Fix writing of IRCAM files (thanks to Axel Röbel).
Fix writing of IRCAM files on big endian systems (thanks to Axel Roebel).
* src/wav.c
Add workaround for files created by the Peak audio editor on Mac which can

45
examples/sndfile-play.c
View File

@ -90,7 +90,8 @@ alsa_play (int argc, char *argv [])
continue ;
} ;
alsa_dev = alsa_open (sfinfo.channels, sfinfo.samplerate, SF_FALSE) ;
if ((alsa_dev = alsa_open (sfinfo.channels, sfinfo.samplerate, SF_FALSE)) == NULL)
continue ;
subformat = sfinfo.format & SF_FORMAT_SUBMASK ;
@ -127,7 +128,7 @@ alsa_play (int argc, char *argv [])
static snd_pcm_t *
alsa_open (int channels, int samplerate, int realtime)
{ const char * device = "plughw:0" ;
snd_pcm_t *alsa_dev ;
snd_pcm_t *alsa_dev = NULL ;
snd_pcm_hw_params_t *hw_params ;
snd_pcm_uframes_t buffer_size, xfer_align, start_threshold ;
snd_pcm_uframes_t alsa_period_size, alsa_buffer_frames ;
@ -146,54 +147,54 @@ alsa_open (int channels, int samplerate, int realtime)
if ((err = snd_pcm_open (&alsa_dev, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0)
{ fprintf (stderr, "cannot open audio device \"%s\" (%s)\n", device, snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
snd_pcm_nonblock (alsa_dev, 0) ;
if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0)
{ fprintf (stderr, "cannot allocate hardware parameter structure (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
if ((err = snd_pcm_hw_params_any (alsa_dev, hw_params)) < 0)
{ fprintf (stderr, "cannot initialize hardware parameter structure (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
if ((err = snd_pcm_hw_params_set_access (alsa_dev, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
{ fprintf (stderr, "cannot set access type (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
if ((err = snd_pcm_hw_params_set_format (alsa_dev, hw_params, SND_PCM_FORMAT_FLOAT)) < 0)
{ fprintf (stderr, "cannot set sample format (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
if ((err = snd_pcm_hw_params_set_rate_near (alsa_dev, hw_params, &samplerate, 0)) < 0)
{ fprintf (stderr, "cannot set sample rate (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
if ((err = snd_pcm_hw_params_set_channels (alsa_dev, hw_params, channels)) < 0)
{ fprintf (stderr, "cannot set channel count (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
if ((err = snd_pcm_hw_params_set_buffer_size_near (alsa_dev, hw_params, &alsa_buffer_frames)) < 0)
{ fprintf (stderr, "cannot set buffer size (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
if ((err = snd_pcm_hw_params_set_period_size_near (alsa_dev, hw_params, &alsa_period_size, 0)) < 0)
{ fprintf (stderr, "cannot set period size (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
if ((err = snd_pcm_hw_params (alsa_dev, hw_params)) < 0)
{ fprintf (stderr, "cannot set parameters (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
/* extra check: if we have only one period, this code won't work */
@ -201,26 +202,26 @@ alsa_open (int channels, int samplerate, int realtime)
snd_pcm_hw_params_get_buffer_size (hw_params, &buffer_size) ;
if (alsa_period_size == buffer_size)
{ fprintf (stderr, "Can't use period equal to buffer size (%lu == %lu)", alsa_period_size, buffer_size) ;
return NULL ;
goto catch_error ;
} ;
snd_pcm_hw_params_free (hw_params) ;
if ((err = snd_pcm_sw_params_malloc (&sw_params)) != 0)
{ fprintf (stderr, "%s: snd_pcm_sw_params_malloc: %s", __func__, snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
if ((err = snd_pcm_sw_params_current (alsa_dev, sw_params)) != 0)
{ fprintf (stderr, "%s: snd_pcm_sw_params_current: %s", __func__, snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
/* note: set start threshold to delay start until the ring buffer is full */
snd_pcm_sw_params_current (alsa_dev, sw_params) ;
if ((err = snd_pcm_sw_params_get_xfer_align (sw_params, &xfer_align)) < 0)
{ fprintf (stderr, "cannot get xfer align (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
/* round up to closest transfer boundary */
@ -229,17 +230,25 @@ alsa_open (int channels, int samplerate, int realtime)
start_threshold = 1 ;
if ((err = snd_pcm_sw_params_set_start_threshold (alsa_dev, sw_params, start_threshold)) < 0)
{ fprintf (stderr, "cannot set start threshold (%s)\n", snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
if ((err = snd_pcm_sw_params (alsa_dev, sw_params)) != 0)
{ fprintf (stderr, "%s: snd_pcm_sw_params: %s", __func__, snd_strerror (err)) ;
return NULL ;
goto catch_error ;
} ;
snd_pcm_sw_params_free (sw_params) ;
snd_pcm_reset (alsa_dev) ;
catch_error :
if (err < 0 && alsa_dev != NULL)
{ snd_pcm_close (alsa_dev) ;
return NULL ;
} ;
return alsa_dev ;
} /* alsa_open */