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-rw-r--r--src/audioOutputs/audioOutput_alsa.c116
1 files changed, 50 insertions, 66 deletions
diff --git a/src/audioOutputs/audioOutput_alsa.c b/src/audioOutputs/audioOutput_alsa.c
index f0aa32713..474db080f 100644
--- a/src/audioOutputs/audioOutput_alsa.c
+++ b/src/audioOutputs/audioOutput_alsa.c
@@ -36,6 +36,19 @@
#include <alsa/asoundlib.h>
+/*
+ * This macro will evaluate both statements, but only returns the result
+ * of the second statement to the reader. Thus it'll stringify the
+ * command name and assign it to the scoped cmd variable.
+ */
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+# define E(command , arg1 , ...) \
+ (err_cmd = #command, command( arg1 , __VA_ARGS__ ))
+#else /* ! C99, this works for gcc 2.95 at least: */
+# define E(command , arg1 , args...) \
+ (err_cmd = #command, command( arg1 , ##args ))
+#endif /* ! C99 */
+
typedef snd_pcm_sframes_t alsa_writei_t(snd_pcm_t * pcm, const void *buffer,
snd_pcm_uframes_t size);
@@ -132,7 +145,7 @@ static int alsa_openDevice(AudioOutput * audioOutput)
snd_pcm_uframes_t alsa_buffer_size;
snd_pcm_uframes_t alsa_period_size;
int err;
- const char *cmd = NULL;
+ const char *err_cmd = NULL;
int retry = MPD_ALSA_RETRY_NR;
unsigned int period_time, period_time_ro;
unsigned int buffer_time;
@@ -156,57 +169,49 @@ static int alsa_openDevice(AudioOutput * audioOutput)
return -1;
}
- err = snd_pcm_open(&ad->pcmHandle, ad->device,
- SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
+ err = E(snd_pcm_open, &ad->pcmHandle, ad->device,
+ SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
snd_config_update_free_global();
if (err < 0) {
ad->pcmHandle = NULL;
goto error;
}
- cmd = "snd_pcm_nonblock";
- err = snd_pcm_nonblock(ad->pcmHandle, 0);
- if (err < 0)
+ if ((err = E(snd_pcm_nonblock, ad->pcmHandle, 0)) < 0)
goto error;
period_time_ro = period_time = ad->period_time;
configure_hw:
/* configure HW params */
snd_pcm_hw_params_alloca(&hwparams);
-
- cmd = "snd_pcm_hw_params_any";
- err = snd_pcm_hw_params_any(ad->pcmHandle, hwparams);
- if (err < 0)
+ if ((err = E(snd_pcm_hw_params_any, ad->pcmHandle, hwparams)) < 0)
goto error;
if (ad->useMmap) {
err = snd_pcm_hw_params_set_access(ad->pcmHandle, hwparams,
- SND_PCM_ACCESS_MMAP_INTERLEAVED);
+ SND_PCM_ACCESS_MMAP_INTERLEAVED);
if (err < 0) {
- ERROR("Cannot set mmap'ed mode on alsa device \"%s\": "
- " %s\n", ad->device, snd_strerror(-err));
- ERROR("Falling back to direct write mode\n");
+ ERROR("ALSA cannot enable mmap on device \"%s\": %s. "
+ "Falling back to direct write mode\n",
+ ad->device, snd_strerror(-err));
ad->useMmap = 0;
- } else
- ad->writei = snd_pcm_mmap_writei;
+ }
}
-
- if (!ad->useMmap) {
- cmd = "snd_pcm_hw_params_set_access";
- err = snd_pcm_hw_params_set_access(ad->pcmHandle, hwparams,
- SND_PCM_ACCESS_RW_INTERLEAVED);
- if (err < 0)
+ if (ad->useMmap) {
+ ad->writei = snd_pcm_mmap_writei;
+ } else {
+ if ((err = E(snd_pcm_hw_params_set_access, ad->pcmHandle,
+ hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
goto error;
ad->writei = snd_pcm_writei;
}
err = snd_pcm_hw_params_set_format(ad->pcmHandle, hwparams, bitformat);
if (err < 0) {
- ERROR("ALSA device \"%s\" does not support %i bit audio: "
- "%s\n", ad->device, audioFormat->bits, snd_strerror(-err));
+ ERROR("ALSA device \"%s\" does not support %i bit audio:%s\n",
+ ad->device, audioFormat->bits, snd_strerror(-err));
goto fail;
}
-
err = snd_pcm_hw_params_set_channels_near(ad->pcmHandle, hwparams,
&channels);
if (err < 0) {
@@ -227,21 +232,17 @@ configure_hw:
audioFormat->sampleRate = sampleRate;
buffer_time = ad->buffer_time;
- cmd = "snd_pcm_hw_params_set_buffer_time_near";
- err = snd_pcm_hw_params_set_buffer_time_near(ad->pcmHandle, hwparams,
- &buffer_time, NULL);
- if (err < 0)
+ if ((err = E(snd_pcm_hw_params_set_buffer_time_near, ad->pcmHandle,
+ hwparams, &buffer_time, NULL)) < 0)
goto error;
period_time = period_time_ro;
- cmd = "snd_pcm_hw_params_set_period_time_near";
- err = snd_pcm_hw_params_set_period_time_near(ad->pcmHandle, hwparams,
- &period_time, NULL);
- if (err < 0)
+
+ if ((err = E(snd_pcm_hw_params_set_period_time_near,
+ ad->pcmHandle, hwparams, &period_time, NULL)) < 0)
goto error;
- cmd = "snd_pcm_hw_params";
- err = snd_pcm_hw_params(ad->pcmHandle, hwparams);
+ err = E(snd_pcm_hw_params, ad->pcmHandle, hwparams);
if (err == -EPIPE && --retry > 0) {
period_time_ro = period_time_ro >> 1;
goto configure_hw;
@@ -250,15 +251,12 @@ configure_hw:
if (retry != MPD_ALSA_RETRY_NR)
DEBUG("ALSA period_time set to %d\n", period_time);
- cmd = "snd_pcm_hw_params_get_buffer_size";
- err = snd_pcm_hw_params_get_buffer_size(hwparams, &alsa_buffer_size);
- if (err < 0)
+ if ((err = E(snd_pcm_hw_params_get_buffer_size, hwparams,
+ &alsa_buffer_size)) < 0)
goto error;
- cmd = "snd_pcm_hw_params_get_period_size";
- err = snd_pcm_hw_params_get_period_size(hwparams, &alsa_period_size,
- NULL);
- if (err < 0)
+ if ((err = E(snd_pcm_hw_params_get_period_size, hwparams,
+ &alsa_period_size, NULL)) < 0)
goto error;
ad->canPause = snd_pcm_hw_params_can_pause(hwparams);
@@ -267,32 +265,18 @@ configure_hw:
/* configure SW params */
snd_pcm_sw_params_alloca(&swparams);
- cmd = "snd_pcm_sw_params_current";
- err = snd_pcm_sw_params_current(ad->pcmHandle, swparams);
- if (err < 0)
+ if ((err = E(snd_pcm_sw_params_current, ad->pcmHandle, swparams)) < 0)
goto error;
-
- cmd = "snd_pcm_sw_params_set_start_threshold";
- err = snd_pcm_sw_params_set_start_threshold(ad->pcmHandle, swparams,
- alsa_buffer_size -
- alsa_period_size);
- if (err < 0)
+ if ((err = E(snd_pcm_sw_params_set_start_threshold, ad->pcmHandle,
+ swparams, alsa_buffer_size - alsa_period_size)) < 0)
goto error;
-
- cmd = "snd_pcm_sw_params_set_avail_min";
- err = snd_pcm_sw_params_set_avail_min(ad->pcmHandle, swparams,
- alsa_period_size);
- if (err < 0)
+ if ((err = E(snd_pcm_sw_params_set_avail_min, ad->pcmHandle,
+ swparams, alsa_period_size)) < 0)
goto error;
-
- cmd = "snd_pcm_sw_params_set_xfer_align";
- err = snd_pcm_sw_params_set_xfer_align(ad->pcmHandle, swparams, 1);
- if (err < 0)
+ if ((err = E(snd_pcm_sw_params_set_xfer_align, ad->pcmHandle,
+ swparams, 1)) < 0)
goto error;
-
- cmd = "snd_pcm_sw_params";
- err = snd_pcm_sw_params(ad->pcmHandle, swparams);
- if (err < 0)
+ if ((err = E(snd_pcm_sw_params, ad->pcmHandle, swparams)) < 0)
goto error;
ad->sampleSize = (audioFormat->bits / 8) * audioFormat->channels;
@@ -306,9 +290,9 @@ configure_hw:
return 0;
error:
- if (cmd) {
+ if (err_cmd) {
ERROR("Error opening alsa device \"%s\" (%s): %s\n",
- ad->device, cmd, snd_strerror(-err));
+ ad->device, err_cmd, snd_strerror(-err));
} else {
ERROR("Error opening alsa device \"%s\": %s\n", ad->device,
snd_strerror(-err));
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-24 17:47:12 +0000