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output/alsa: simplify alsa_output_try_format_both()

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Merge three functions into one and call get_bitformat() only once.
This commit is contained in:
Max Kellermann
2012-03-22 00:23:07 +01:00
parent 11e83eb7e7
commit 2874d68bdb
1 changed files with 18 additions and 45 deletions
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63
src/output/alsa_output_plugin.c
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@@ -260,11 +260,13 @@ byteswap_bitformat(snd_pcm_format_t fmt)
}
/**
* Attempts to configure the specified sample format.
* Attempts to configure the specified sample format, and tries the
* reversed host byte order if was not supported.
*/
static int
alsa_output_try_format(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
struct audio_format *audio_format,
bool *reverse_endian_r,
enum sample_format sample_format)
{
snd_pcm_format_t alsa_format = get_bitformat(sample_format);
@@ -272,51 +274,22 @@ alsa_output_try_format(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
return -EINVAL;
int err = snd_pcm_hw_params_set_format(pcm, hwparams, alsa_format);
if (err == 0)
if (err == 0) {
*reverse_endian_r = false;
audio_format->format = sample_format;
}
return err;
}
if (err != -EINVAL)
return err;
/**
* Attempts to configure the specified sample format with reversed
* host byte order.
*/
static int
alsa_output_try_reverse(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
struct audio_format *audio_format,
enum sample_format sample_format)
{
snd_pcm_format_t alsa_format =
byteswap_bitformat(get_bitformat(sample_format));
alsa_format = byteswap_bitformat(alsa_format);
if (alsa_format == SND_PCM_FORMAT_UNKNOWN)
return -EINVAL;
int err = snd_pcm_hw_params_set_format(pcm, hwparams, alsa_format);
if (err == 0)
audio_format->format = sample_format;
return err;
}
/**
* Attempts to configure the specified sample format, and tries the
* reversed host byte order if was not supported.
*/
static int
alsa_output_try_format_both(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
struct audio_format *audio_format,
bool *reverse_endian_r,
enum sample_format sample_format)
{
*reverse_endian_r = false;
int err = alsa_output_try_format(pcm, hwparams, audio_format,
sample_format);
if (err == -EINVAL) {
err = snd_pcm_hw_params_set_format(pcm, hwparams, alsa_format);
if (err == 0) {
*reverse_endian_r = true;
err = alsa_output_try_reverse(pcm, hwparams, audio_format,
sample_format);
audio_format->format = sample_format;
}
return err;
@@ -332,9 +305,9 @@ alsa_output_setup_format(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
{
/* try the input format first */
int err = alsa_output_try_format_both(pcm, hwparams, audio_format,
reverse_endian_r,
audio_format->format);
int err = alsa_output_try_format(pcm, hwparams, audio_format,
reverse_endian_r,
audio_format->format);
if (err != -EINVAL)
return err;
@@ -353,9 +326,9 @@ alsa_output_setup_format(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
if (probe_formats[i] == audio_format->format)
continue;
err = alsa_output_try_format_both(pcm, hwparams, audio_format,
reverse_endian_r,
probe_formats[i]);
err = alsa_output_try_format(pcm, hwparams, audio_format,
reverse_endian_r,
probe_formats[i]);
if (err != -EINVAL)
return err;
}