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spa: alsa: Read and expose channel count and position from ELD

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The next step will be to propagate this to the correct node.
This commit is contained in:
Arun Raghavan 2025-10-08 16:38:51 -07:00 • committed by Wim Taymans
parent d268b6e104
commit 91e2f184e2
4 changed files with 90 additions and 3 deletions
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10
spa/plugins/alsa/acp/alsa-util.c
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@ -2020,14 +2020,24 @@ int pa_alsa_get_hdmi_eld(snd_hctl_elem_t *elem, pa_hdmi_eld *eld) {
sad_count = 0;
}
/* Look up speaker presence in Speaker Allocation Data Block */
eld->speakers = elddata[7] & 0x7f;
eld->lpcm_channels = 0;
eld->iec958_codecs = 0;
for (unsigned i = 0; i < sad_count; i++) {
uint8_t *sad = &elddata[20 + mnl + 3 * i];
uint8_t lpcm_channels;
/* https://en.wikipedia.org/wiki/Extended_Display_Identification_Data#Audio_Data_Blocks */
switch ((sad[0] & 0x78) >> 3) {
case 1:
eld->iec958_codecs |= 1ULL << SPA_AUDIO_IEC958_CODEC_PCM;
/* Lowest 3 bits are channel count - 1 */
lpcm_channels = (sad[0] & 0x07) + 1;
if (lpcm_channels > eld->lpcm_channels)
eld->lpcm_channels = lpcm_channels;
break;
case 2:
eld->iec958_codecs |= 1ULL << SPA_AUDIO_IEC958_CODEC_AC3;