return n;
}
-int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delay, size_t hwbuf_size, const pa_sample_spec *ss, pa_bool_t capture) {
+int pa_alsa_safe_delay(snd_pcm_t *pcm, snd_pcm_status_t *status, snd_pcm_sframes_t *delay, size_t hwbuf_size, const pa_sample_spec *ss,
+ pa_bool_t capture) {
ssize_t k;
size_t abs_k;
- int r;
+ int err;
snd_pcm_sframes_t avail = 0;
pa_assert(pcm);
/* Some ALSA driver expose weird bugs, let's inform the user about
* what is going on. We're going to get both the avail and delay values so
- * that we can compare and check them for capture */
+ * that we can compare and check them for capture.
+ * This is done with snd_pcm_status() which provides
+ * avail, delay and timestamp values in a single kernel call to improve
+ * timer-based scheduling */
- if ((r = snd_pcm_avail_delay(pcm, &avail, delay)) < 0)
- return r;
+ if ((err = snd_pcm_status(pcm, status)) < 0)
+ return err;
+
+ avail = snd_pcm_status_get_avail(status);
+ *delay = snd_pcm_status_get_delay(status);
k = (ssize_t) *delay * (ssize_t) pa_frame_size(ss);
return pa_sprintf_malloc("Audio%i", i);
}
-unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm) {
+unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm, unsigned int fallback_rate) {
static unsigned int all_rates[] = { 8000, 11025, 12000,
16000, 22050, 24000,
32000, 44100, 48000,
}
}
- if (n == 0)
- return NULL;
+ if (n > 0) {
+ rates = pa_xnew(unsigned int, n + 1);
- rates = pa_xnew(unsigned int, n + 1);
+ for (i = 0, j = 0; i < PA_ELEMENTSOF(all_rates); i++) {
+ if (supported[i])
+ rates[j++] = all_rates[i];
+ }
- for (i = 0, j = 0; i < PA_ELEMENTSOF(all_rates); i++) {
- if (supported[i])
- rates[j++] = all_rates[i];
- }
+ rates[j] = 0;
+ } else {
+ rates = pa_xnew(unsigned int, 2);
+
+ rates[0] = fallback_rate;
+ if ((ret = snd_pcm_hw_params_set_rate_near(pcm, hwparams, &rates[0], NULL)) < 0) {
+ pa_log_debug("snd_pcm_hw_params_set_rate_near() failed: %s", pa_alsa_strerror(ret));
+ pa_xfree(rates);
+ return NULL;
+ }
- rates[j] = 0;
+ rates[1] = 0;
+ }
return rates;
}
return TRUE;
}
-snd_hctl_elem_t* pa_alsa_find_jack(snd_hctl_t *hctl, const char* jack_name)
-{
+snd_hctl_elem_t* pa_alsa_find_jack(snd_hctl_t *hctl, const char* jack_name) {
snd_ctl_elem_id_t *id;
snd_ctl_elem_id_alloca(&id);
return snd_hctl_find_elem(hctl, id);
}
+snd_hctl_elem_t* pa_alsa_find_eld_ctl(snd_hctl_t *hctl, int device) {
+ snd_ctl_elem_id_t *id;
+
+ /* See if we can find the ELD control */
+ snd_ctl_elem_id_alloca(&id);
+ snd_ctl_elem_id_clear(id);
+ snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_PCM);
+ snd_ctl_elem_id_set_name(id, "ELD");
+ snd_ctl_elem_id_set_device(id, device);
+
+ return snd_hctl_find_elem(hctl, id);
+}
+
static int prepare_mixer(snd_mixer_t *mixer, const char *dev, snd_hctl_t **hctl) {
int err;
snd_mixer_close(m);
return NULL;
}
+
+int pa_alsa_get_hdmi_eld(snd_hctl_t *hctl, int device, pa_hdmi_eld *eld) {
+
+ /* The ELD format is specific to HDA Intel sound cards and defined in the
+ HDA specification: http://www.intel.com/content/www/us/en/standards/high-definition-audio-specification.html */
+ int err;
+ snd_hctl_elem_t *elem;
+ snd_ctl_elem_info_t *info;
+ snd_ctl_elem_value_t *value;
+ uint8_t *elddata;
+ unsigned int eldsize, mnl;
+
+ pa_assert(eld != NULL);
+
+ /* See if we can find the ELD control */
+ elem = pa_alsa_find_eld_ctl(hctl, device);
+ if (elem == NULL) {
+ pa_log_debug("No ELD info control found (for device=%d)", device);
+ return -1;
+ }
+
+ /* Does it have any contents? */
+ snd_ctl_elem_info_alloca(&info);
+ snd_ctl_elem_value_alloca(&value);
+ if ((err = snd_hctl_elem_info(elem, info)) < 0 ||
+ (err = snd_hctl_elem_read(elem, value)) < 0) {
+ pa_log_warn("Accessing ELD control failed with error %s", snd_strerror(err));
+ return -1;
+ }
+
+ eldsize = snd_ctl_elem_info_get_count(info);
+ elddata = (unsigned char *) snd_ctl_elem_value_get_bytes(value);
+ if (elddata == NULL || eldsize == 0) {
+ pa_log_debug("ELD info empty (for device=%d)", device);
+ return -1;
+ }
+ if (eldsize < 20 || eldsize > 256) {
+ pa_log_debug("ELD info has wrong size (for device=%d)", device);
+ return -1;
+ }
+
+ /* Try to fetch monitor name */
+ mnl = elddata[4] & 0x1f;
+ if (mnl == 0 || mnl > 16 || 20 + mnl > eldsize) {
+ pa_log_debug("No monitor name in ELD info (for device=%d)", device);
+ mnl = 0;
+ }
+ memcpy(eld->monitor_name, &elddata[20], mnl);
+ eld->monitor_name[mnl] = '\0';
+ if (mnl)
+ pa_log_debug("Monitor name in ELD info is '%s' (for device=%d)", eld->monitor_name, device);
+
+ return 0;
+}