+
+static const unsigned p_aob_group1[21][6] = {
+ { AOUT_CHAN_CENTER, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
+ { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
+};
+static const unsigned p_aob_group2[21][6] = {
+ { 0 },
+ { 0 },
+ { AOUT_CHAN_REARCENTER, 0 },
+ { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
+ { AOUT_CHAN_LFE, 0 },
+ { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
+ { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
+ { AOUT_CHAN_CENTER, 0 },
+ { AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, 0 },
+ { AOUT_CHAN_CENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
+ { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
+ { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
+ { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
+ { AOUT_CHAN_REARCENTER, 0 },
+ { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
+ { AOUT_CHAN_LFE, 0 },
+ { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
+ { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
+ { AOUT_CHAN_LFE, 0 },
+ { AOUT_CHAN_CENTER, 0 },
+ { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
+};
+
+static int AobHeader( unsigned *pi_rate,
+ unsigned *pi_channels, unsigned *pi_layout,
+ unsigned *pi_bits,
+ unsigned *pi_padding,
+ aob_group_t g[2],
+ const uint8_t *p_header )
+{
+ const unsigned i_header_size = GetWBE( &p_header[1] );
+ if( i_header_size + 3 < LPCM_AOB_HEADER_LEN )
+ return VLC_EGENERIC;
+
+ *pi_padding = 3+i_header_size - LPCM_AOB_HEADER_LEN;
+
+ const int i_index_size_g1 = (p_header[6] >> 4) & 0x0f;
+ const int i_index_size_g2 = (p_header[6] ) & 0x0f;
+ const int i_index_rate_g1 = (p_header[7] >> 4) & 0x0f;
+ const int i_index_rate_g2 = (p_header[7] ) & 0x0f;
+ const int i_assignment = p_header[9];
+
+ /* Validate */
+ if( i_index_size_g1 > 0x02 ||
+ ( i_index_size_g2 != 0x0f && i_index_size_g2 > 0x02 ) )
+ return VLC_EGENERIC;
+ if( (i_index_rate_g1 & 0x07) > 0x02 ||
+ ( i_index_rate_g2 != 0x0f && (i_index_rate_g1 & 0x07) > 0x02 ) )
+ return VLC_EGENERIC;
+ if( i_assignment > 20 )
+ return VLC_EGENERIC;
+
+ /* */
+ *pi_bits = 16 + 4 * i_index_size_g1;
+ if( i_index_rate_g1 & 0x08 )
+ *pi_rate = 44100 << (i_index_rate_g1 & 0x07);
+ else
+ *pi_rate = 48000 << (i_index_rate_g1 & 0x07);
+
+
+ /* Group1 */
+ unsigned i_channels1 = 0;
+ unsigned i_layout1 = 0;
+ for( int i = 0; p_aob_group1[i_assignment][i] != 0; i++ )
+ {
+ i_channels1++;
+ i_layout1 |= p_aob_group1[i_assignment][i];
+ }
+ /* Group2 */
+ unsigned i_channels2 = 0;
+ unsigned i_layout2 = 0;
+ if( i_index_size_g2 != 0x0f && i_index_rate_g2 != 0x0f )
+ {
+ for( int i = 0; p_aob_group2[i_assignment][i] != 0; i++ )
+ {
+ i_channels2++;
+ i_layout2 |= p_aob_group2[i_assignment][i];
+ }
+ assert( (i_layout1 & i_layout2) == 0 );
+ }
+ /* It is enabled only when presents and compatible wih group1 */
+ const bool b_group2_used = i_index_size_g1 == i_index_size_g2 &&
+ i_index_rate_g1 == i_index_rate_g2;
+
+ /* */
+ *pi_channels = i_channels1 + ( b_group2_used ? i_channels2 : 0 );
+ *pi_layout = i_layout1 | ( b_group2_used ? i_layout2 : 0 );
+
+ /* */
+ for( unsigned i = 0; i < 2; i++ )
+ {
+ const unsigned *p_aob = i == 0 ? p_aob_group1[i_assignment] :
+ p_aob_group2[i_assignment];
+ g[i].i_channels = i == 0 ? i_channels1 :
+ i_channels2;
+
+ g[i].b_used = i == 0 || b_group2_used;
+ if( !g[i].b_used )
+ continue;
+ for( unsigned j = 0; j < g[i].i_channels; j++ )
+ {
+ g[i].pi_position[j] = 0;
+ for( int k = 0; pi_vlc_chan_order_wg4[k] != 0; k++ )
+ {
+ const unsigned i_channel = pi_vlc_chan_order_wg4[k];
+ if( i_channel == p_aob[j] )
+ break;
+ if( (*pi_layout) & i_channel )
+ g[i].pi_position[j]++;
+ }
+ }
+ }
+ return VLC_SUCCESS;
+}
+