auhal: add support for 8.0 and 8.1 output (close #8536)

modules/audio_output/auhal.c

@@ -554,6 +554,28 @@ static int StartAnalog(audio_output_t *p_aout, audio_sample_format_t *fmt)
     memset (&new_layout, 0, sizeof(new_layout));
     uint32_t chans_out[AOUT_CHAN_MAX];
 
+    /* Some channel abbreviations used below:
+     * L - left
+     * R - right
+     * C - center
+     * Ls - left surround
+     * Rs - right surround
+     * Cs - center surround
+     * Rls - rear left surround
+     * Rrs - rear right surround
+     * Lw - left wide
+     * Rw - right wide
+     * Lsd - left surround direct
+     * Rsd - right surround direct
+     * Lc - left center
+     * Rc - right center
+     * Ts - top surround
+     * Vhl - vertical height left
+     * Vhc - vertical height center
+     * Vhr - vertical height right
+     * Lt - left matrix total. for matrix encoded stereo.
+     * Rt - right matrix total. for matrix encoded stereo. */
+
     switch(aout_FormatNbChannels(fmt)) {
         case 1:
             new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_Mono;
@@ -588,7 +610,7 @@ static int StartAnalog(audio_output_t *p_aout, audio_sample_format_t *fmt)
                 new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_AudioUnit_6_0; // L R Ls Rs C Cs
             break;
         case 7:
-            new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_6_1_A;
+            new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_6_1_A; // L R C LFE Ls Rs Cs
 
             chans_out[0] = AOUT_CHAN_LEFT;
             chans_out[1] = AOUT_CHAN_RIGHT;
@@ -604,21 +626,49 @@ static int StartAnalog(audio_output_t *p_aout, audio_sample_format_t *fmt)
 
             break;
         case 8:
-            new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_7_1_A;
+            if (fmt->i_physical_channels & (AOUT_CHAN_LFE)) {
+                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_7_1_A; // L R C LFE Ls Rs Lc Rc
+
+                chans_out[0] = AOUT_CHAN_LEFT;
+                chans_out[1] = AOUT_CHAN_RIGHT;
+                chans_out[2] = AOUT_CHAN_CENTER;
+                chans_out[3] = AOUT_CHAN_LFE;
+                chans_out[4] = AOUT_CHAN_MIDDLELEFT;
+                chans_out[5] = AOUT_CHAN_MIDDLERIGHT;
+                chans_out[6] = AOUT_CHAN_REARLEFT;
+                chans_out[7] = AOUT_CHAN_REARRIGHT;
+            } else {
+                new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DTS_8_0_B; // Lc C Rc L R Ls Cs Rs
+
+                chans_out[0] = AOUT_CHAN_MIDDLELEFT;
+                chans_out[1] = AOUT_CHAN_CENTER;
+                chans_out[2] = AOUT_CHAN_MIDDLERIGHT;
+                chans_out[3] = AOUT_CHAN_LEFT;
+                chans_out[4] = AOUT_CHAN_RIGHT;
+                chans_out[5] = AOUT_CHAN_REARLEFT;
+                chans_out[6] = AOUT_CHAN_REARCENTER;
+                chans_out[7] = AOUT_CHAN_REARRIGHT;
+            }
+            p_aout->sys->chans_to_reorder = aout_CheckChannelReorder(NULL, chans_out, fmt->i_physical_channels, p_aout->sys->chan_table);
+            if (p_aout->sys->chans_to_reorder)
+                msg_Dbg(p_aout, "channel reordering needed for 7.1 / 8.0 output");
 
-            chans_out[0] = AOUT_CHAN_LEFT;
-            chans_out[1] = AOUT_CHAN_RIGHT;
-            chans_out[2] = AOUT_CHAN_CENTER;
-            chans_out[3] = AOUT_CHAN_LFE;
-            chans_out[4] = AOUT_CHAN_MIDDLELEFT;
-            chans_out[5] = AOUT_CHAN_MIDDLERIGHT;
-            chans_out[6] = AOUT_CHAN_REARLEFT;
+            break;
+        case 9:
+            new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DTS_8_1_B; // Lc C Rc L R Ls Cs Rs LFE
+            chans_out[0] = AOUT_CHAN_MIDDLELEFT;
+            chans_out[1] = AOUT_CHAN_CENTER;
+            chans_out[2] = AOUT_CHAN_MIDDLERIGHT;
+            chans_out[3] = AOUT_CHAN_LEFT;
+            chans_out[4] = AOUT_CHAN_RIGHT;
+            chans_out[5] = AOUT_CHAN_REARLEFT;
+            chans_out[6] = AOUT_CHAN_REARCENTER;
             chans_out[7] = AOUT_CHAN_REARRIGHT;
+            chans_out[8] = AOUT_CHAN_LFE;
 
             p_aout->sys->chans_to_reorder = aout_CheckChannelReorder(NULL, chans_out, fmt->i_physical_channels, p_aout->sys->chan_table);
             if (p_aout->sys->chans_to_reorder)
-                msg_Dbg(p_aout, "channel reordering needed for 7.1 output");
-
+                msg_Dbg(p_aout, "channel reordering needed for 8.1 output");
             break;
     }