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alsa: implement enum_format

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This commit is contained in:
Wim Taymans 2017-04-04 19:44:00 +02:00
parent 698bddfbb6
commit 4bdbb58276
4 changed files with 114 additions and 96 deletions
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93
spa/plugins/alsa/alsa-utils.c
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@ -110,6 +110,98 @@ spa_alsa_format_to_alsa (Type *map, uint32_t format)
return SND_PCM_FORMAT_UNKNOWN;
}
SpaResult
spa_alsa_enum_format (SpaALSAState *state,
SpaFormat **format,
const SpaFormat *filter,
uint32_t index)
{
snd_pcm_t *hndl;
snd_pcm_hw_params_t *params;
snd_pcm_format_mask_t *fmask;
int err, i, j, dir;
unsigned int min, max;
SpaPODBuilder b = { NULL, };
SpaPODFrame f[2];
SpaPODProp *prop;
if (index == 1)
return SPA_RESULT_ENUM_END;
if ((err = spa_alsa_open (state)) < 0)
return SPA_RESULT_ERROR;
hndl = state->hndl;
snd_pcm_hw_params_alloca (&params);
CHECK (snd_pcm_hw_params_any (hndl, params), "Broken configuration: no configurations available");
spa_pod_builder_init (&b, state->format_buffer, sizeof (state->format_buffer));
spa_pod_builder_push_format (&b, &f[0], state->type.format,
state->type.media_type.audio,
state->type.media_subtype.raw);
snd_pcm_format_mask_alloca (&fmask);
snd_pcm_hw_params_get_format_mask (params, fmask);
spa_pod_builder_push_prop (&b, &f[1],
state->type.format_audio.format,
SPA_POD_PROP_RANGE_NONE);
prop = SPA_POD_BUILDER_DEREF (&b, f[1].ref, SpaPODProp);
for (i = 1, j = 0; i < SPA_N_ELEMENTS (format_info); i++) {
const FormatInfo *fi = &format_info[i];
if (snd_pcm_format_mask_test (fmask, fi->format)) {
uint32_t f = *SPA_MEMBER (&state->type, fi->format_offset, uint32_t);
if (j++ == 0)
spa_pod_builder_id (&b, f);
spa_pod_builder_id (&b, f);
}
}
if (j > 1)
prop->body.flags |= SPA_POD_PROP_RANGE_ENUM | SPA_POD_PROP_FLAG_UNSET;
spa_pod_builder_pop (&b, &f[1]);
CHECK (snd_pcm_hw_params_get_rate_min (params, &min, &dir), "get_rate_min");
CHECK (snd_pcm_hw_params_get_rate_max (params, &max, &dir), "get_rate_max");
spa_pod_builder_push_prop (&b, &f[1],
state->type.format_audio.rate,
SPA_POD_PROP_RANGE_NONE);
prop = SPA_POD_BUILDER_DEREF (&b, f[1].ref, SpaPODProp);
spa_pod_builder_int (&b, SPA_CLAMP (44100, min, max));
if (min != max) {
spa_pod_builder_int (&b, min);
spa_pod_builder_int (&b, max);
prop->body.flags |= SPA_POD_PROP_RANGE_MIN_MAX | SPA_POD_PROP_FLAG_UNSET;
}
spa_pod_builder_pop (&b, &f[1]);
CHECK (snd_pcm_hw_params_get_channels_min (params, &min), "get_channels_min");
CHECK (snd_pcm_hw_params_get_channels_max (params, &max), "get_channels_max");
spa_pod_builder_push_prop (&b, &f[1],
state->type.format_audio.channels,
SPA_POD_PROP_RANGE_NONE);
prop = SPA_POD_BUILDER_DEREF (&b, f[1].ref, SpaPODProp);
spa_pod_builder_int (&b, SPA_CLAMP (2, min, max));
if (min != max) {
spa_pod_builder_int (&b, min);
spa_pod_builder_int (&b, max);
prop->body.flags |= SPA_POD_PROP_RANGE_MIN_MAX | SPA_POD_PROP_FLAG_UNSET;
}
spa_pod_builder_pop (&b, &f[1]);
spa_pod_builder_pop (&b, &f[0]);
*format = SPA_POD_BUILDER_DEREF (&b, f[0].ref, SpaFormat);
return SPA_RESULT_OK;
}
int
spa_alsa_set_format (SpaALSAState *state, SpaAudioInfo *fmt, SpaPortFormatFlags flags)
{
@ -135,6 +227,7 @@ spa_alsa_set_format (SpaALSAState *state, SpaAudioInfo *fmt, SpaPortFormatFlags
/* set the interleaved read/write format */
CHECK (snd_pcm_hw_params_set_access(hndl, params, SND_PCM_ACCESS_MMAP_INTERLEAVED), "set_access");
/* disable ALSA wakeups, we use a timer */
if (snd_pcm_hw_params_can_disable_period_wakeup (params))
CHECK (snd_pcm_hw_params_set_period_wakeup (hndl, params, 0), "set_period_wakeup");