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-rw-r--r--src/output/alsa_plugin.c152
1 files changed, 80 insertions, 72 deletions
diff --git a/src/output/alsa_plugin.c b/src/output/alsa_plugin.c
index cc6986d29..ff591230c 100644
--- a/src/output/alsa_plugin.c
+++ b/src/output/alsa_plugin.c
@@ -216,89 +216,54 @@ byteswap_bitformat(snd_pcm_format_t fmt)
default: return SND_PCM_FORMAT_UNKNOWN;
}
}
+
/**
- * Set up the snd_pcm_t object which was opened by the caller. Set up
- * the configured settings and the audio format.
+ * Configure a sample format, and probe other formats if that fails.
*/
-static bool
-alsa_setup(struct alsa_data *ad, struct audio_format *audio_format,
- snd_pcm_format_t bitformat,
- GError **error)
+static int
+alsa_output_setup_format(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
+ struct audio_format *audio_format)
{
- snd_pcm_hw_params_t *hwparams;
- snd_pcm_sw_params_t *swparams;
- unsigned int sample_rate = audio_format->sample_rate;
- unsigned int channels = audio_format->channels;
- snd_pcm_uframes_t alsa_buffer_size;
- snd_pcm_uframes_t alsa_period_size;
- int err;
- const char *cmd = NULL;
- int retry = MPD_ALSA_RETRY_NR;
- unsigned int period_time, period_time_ro;
- unsigned int buffer_time;
-
- 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->pcm, hwparams);
- if (err < 0)
- goto error;
-
- if (ad->use_mmap) {
- err = snd_pcm_hw_params_set_access(ad->pcm, hwparams,
- SND_PCM_ACCESS_MMAP_INTERLEAVED);
- if (err < 0) {
- g_warning("Cannot set mmap'ed mode on ALSA device \"%s\": %s\n",
- alsa_device(ad), snd_strerror(-err));
- g_warning("Falling back to direct write mode\n");
- ad->use_mmap = false;
- } else
- ad->writei = snd_pcm_mmap_writei;
- }
+ snd_pcm_format_t bitformat = get_bitformat(audio_format);
+ if (bitformat == SND_PCM_FORMAT_UNKNOWN) {
+ /* sample format is not supported by this plugin -
+ fall back to 16 bit samples */
- if (!ad->use_mmap) {
- cmd = "snd_pcm_hw_params_set_access";
- err = snd_pcm_hw_params_set_access(ad->pcm, hwparams,
- SND_PCM_ACCESS_RW_INTERLEAVED);
- if (err < 0)
- goto error;
- ad->writei = snd_pcm_writei;
+ audio_format->format = SAMPLE_FORMAT_S16;
+ bitformat = SND_PCM_FORMAT_S16;
}
- err = snd_pcm_hw_params_set_format(ad->pcm, hwparams, bitformat);
+ int err = snd_pcm_hw_params_set_format(pcm, hwparams, bitformat);
if (err == -EINVAL &&
byteswap_bitformat(bitformat) != SND_PCM_FORMAT_UNKNOWN) {
- err = snd_pcm_hw_params_set_format(ad->pcm, hwparams,
+ err = snd_pcm_hw_params_set_format(pcm, hwparams,
byteswap_bitformat(bitformat));
if (err == 0) {
- g_debug("ALSA device \"%s\": converting format %s to reverse-endian",
- alsa_device(ad),
+ g_debug("converting format %s to reverse-endian",
sample_format_to_string(audio_format->format));
audio_format->reverse_endian = 1;
}
}
+
if (err == -EINVAL && (audio_format->format == SAMPLE_FORMAT_S24_P32 ||
audio_format->format == SAMPLE_FORMAT_S16)) {
/* fall back to 32 bit, let pcm_convert.c do the conversion */
- err = snd_pcm_hw_params_set_format(ad->pcm, hwparams,
+ err = snd_pcm_hw_params_set_format(pcm, hwparams,
SND_PCM_FORMAT_S32);
if (err == 0) {
- g_debug("ALSA device \"%s\": converting format %s to 32 bit\n",
- alsa_device(ad),
+ g_debug("converting format %s to 32 bit\n",
sample_format_to_string(audio_format->format));
audio_format->format = SAMPLE_FORMAT_S32;
}
}
+
if (err == -EINVAL && (audio_format->format == SAMPLE_FORMAT_S24_P32 ||
audio_format->format == SAMPLE_FORMAT_S16)) {
/* fall back to 32 bit, let pcm_convert.c do the conversion */
- err = snd_pcm_hw_params_set_format(ad->pcm, hwparams,
+ err = snd_pcm_hw_params_set_format(pcm, hwparams,
byteswap_bitformat(SND_PCM_FORMAT_S32));
if (err == 0) {
- g_debug("ALSA device \"%s\": converting format %s to 32 bit backward-endian\n",
- alsa_device(ad),
+ g_debug("converting format %s to 32 bit backward-endian\n",
sample_format_to_string(audio_format->format));
audio_format->format = SAMPLE_FORMAT_S32;
audio_format->reverse_endian = 1;
@@ -307,28 +272,81 @@ configure_hw:
if (err == -EINVAL && audio_format->format != SAMPLE_FORMAT_S16) {
/* fall back to 16 bit, let pcm_convert.c do the conversion */
- err = snd_pcm_hw_params_set_format(ad->pcm, hwparams,
+ err = snd_pcm_hw_params_set_format(pcm, hwparams,
SND_PCM_FORMAT_S16);
if (err == 0) {
- g_debug("ALSA device \"%s\": converting format %s to 16 bit\n",
- alsa_device(ad),
+ g_debug("converting format %s to 16 bit\n",
sample_format_to_string(audio_format->format));
audio_format->format = SAMPLE_FORMAT_S16;
}
}
+
if (err == -EINVAL && audio_format->format != SAMPLE_FORMAT_S16) {
/* fall back to 16 bit, let pcm_convert.c do the conversion */
- err = snd_pcm_hw_params_set_format(ad->pcm, hwparams,
+ err = snd_pcm_hw_params_set_format(pcm, hwparams,
byteswap_bitformat(SND_PCM_FORMAT_S16));
if (err == 0) {
- g_debug("ALSA device \"%s\": converting format %s to 16 bit backward-endian\n",
- alsa_device(ad),
+ g_debug("converting format %s to 16 bit backward-endian\n",
sample_format_to_string(audio_format->format));
audio_format->format = SAMPLE_FORMAT_S16;
audio_format->reverse_endian = 1;
}
}
+ return err;
+}
+
+/**
+ * Set up the snd_pcm_t object which was opened by the caller. Set up
+ * the configured settings and the audio format.
+ */
+static bool
+alsa_setup(struct alsa_data *ad, struct audio_format *audio_format,
+ GError **error)
+{
+ snd_pcm_hw_params_t *hwparams;
+ snd_pcm_sw_params_t *swparams;
+ unsigned int sample_rate = audio_format->sample_rate;
+ unsigned int channels = audio_format->channels;
+ snd_pcm_uframes_t alsa_buffer_size;
+ snd_pcm_uframes_t alsa_period_size;
+ int err;
+ const char *cmd = NULL;
+ int retry = MPD_ALSA_RETRY_NR;
+ unsigned int period_time, period_time_ro;
+ unsigned int buffer_time;
+
+ 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->pcm, hwparams);
+ if (err < 0)
+ goto error;
+
+ if (ad->use_mmap) {
+ err = snd_pcm_hw_params_set_access(ad->pcm, hwparams,
+ SND_PCM_ACCESS_MMAP_INTERLEAVED);
+ if (err < 0) {
+ g_warning("Cannot set mmap'ed mode on ALSA device \"%s\": %s\n",
+ alsa_device(ad), snd_strerror(-err));
+ g_warning("Falling back to direct write mode\n");
+ ad->use_mmap = false;
+ } else
+ ad->writei = snd_pcm_mmap_writei;
+ }
+
+ if (!ad->use_mmap) {
+ cmd = "snd_pcm_hw_params_set_access";
+ err = snd_pcm_hw_params_set_access(ad->pcm, hwparams,
+ SND_PCM_ACCESS_RW_INTERLEAVED);
+ if (err < 0)
+ goto error;
+ ad->writei = snd_pcm_writei;
+ }
+
+ err = alsa_output_setup_format(ad->pcm, hwparams, audio_format);
if (err < 0) {
g_set_error(error, alsa_output_quark(), err,
"ALSA device \"%s\" does not support format %s: %s",
@@ -455,19 +473,9 @@ static bool
alsa_open(void *data, struct audio_format *audio_format, GError **error)
{
struct alsa_data *ad = data;
- snd_pcm_format_t bitformat;
int err;
bool success;
- bitformat = get_bitformat(audio_format);
- if (bitformat == SND_PCM_FORMAT_UNKNOWN) {
- /* sample format is not supported by this plugin -
- fall back to 16 bit samples */
-
- audio_format->format = SAMPLE_FORMAT_S16;
- bitformat = SND_PCM_FORMAT_S16;
- }
-
err = snd_pcm_open(&ad->pcm, alsa_device(ad),
SND_PCM_STREAM_PLAYBACK, ad->mode);
if (err < 0) {
@@ -477,7 +485,7 @@ alsa_open(void *data, struct audio_format *audio_format, GError **error)
return false;
}
- success = alsa_setup(ad, audio_format, bitformat, error);
+ success = alsa_setup(ad, audio_format, error);
if (!success) {
snd_pcm_close(ad->pcm);
return false;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-20 19:16:48 +0000