- // stereo input or something not handled below
- default:
- case HB_INPUT_CH_LAYOUT_STEREO:
- // mono gets mixed up to stereo & more than stereo gets mixed down
- if ( STEREO_ONLY( audio ) ||
- audio->config.out.mixdown > HB_AMIXDOWN_STEREO)
- {
- audio->config.out.mixdown = HB_AMIXDOWN_STEREO;
- }
- break;
-
- // mono input
- case HB_INPUT_CH_LAYOUT_MONO:
- if ( STEREO_ONLY( audio ) )
- {
- if ( !CAN_MIXDOWN( audio ) )
- {
- // XXX we're hosed - we can't mix up & lame can't handle
- // the input format. The user shouldn't be able to make
- // this choice. It's too late to do anything about it now
- // so complain in the log & let things abort in lame.
- hb_log( "ERROR - can't use lame mp3 audio output with "
- "mono audio stream %x - output will be messed up",
- audio->id );
- }
- audio->config.out.mixdown = HB_AMIXDOWN_STEREO;
- }
- else
- {
- // everything else passes through
- audio->config.out.mixdown = HB_AMIXDOWN_MONO;
- }
- break;
-
- // dolby (DPL1 aka Dolby Surround = 4.0 matrix-encoded) input
- // the A52 flags don't allow for a way to distinguish between DPL1 and
- // DPL2 on a DVD so we always assume a DPL1 source for A52_DOLBY.
- case HB_INPUT_CH_LAYOUT_DOLBY:
- if ( STEREO_ONLY( audio ) || !CAN_MIXDOWN( audio ) ||
- audio->config.out.mixdown > HB_AMIXDOWN_DOLBY )
- {
- audio->config.out.mixdown = HB_AMIXDOWN_DOLBY;
- }
- break;
-
- // 4 channel discrete
- case HB_INPUT_CH_LAYOUT_2F2R:
- case HB_INPUT_CH_LAYOUT_3F1R:
- if ( CAN_MIXDOWN( audio ) )
- {
- if ( STEREO_ONLY( audio ) ||
- audio->config.out.mixdown > HB_AMIXDOWN_DOLBY )
- {
- audio->config.out.mixdown = HB_AMIXDOWN_DOLBY;
- }
- }
- else
- {
- // XXX we can't mixdown & don't have any way to specify
- // 4 channel discrete output so we're hosed.
- hb_log( "ERROR - can't handle 4 channel discrete audio stream "
- "%x - output will be messed up", audio->id );
- }
- break;
-
- // 5 or 6 channel discrete
- case HB_INPUT_CH_LAYOUT_3F2R:
- if ( CAN_MIXDOWN( audio ) )
- {
- if ( STEREO_ONLY( audio ) )
- {
- if ( audio->config.out.mixdown < HB_AMIXDOWN_STEREO )
- {
- audio->config.out.mixdown = HB_AMIXDOWN_STEREO;
- }
- else if ( audio->config.out.mixdown > HB_AMIXDOWN_DOLBYPLII )
- {
- audio->config.out.mixdown = HB_AMIXDOWN_DOLBYPLII;
- }
- }
- else if ( ! ( audio->config.in.channel_layout &
- HB_INPUT_CH_LAYOUT_HAS_LFE ) )
- {
- // we don't do 5 channel discrete so mixdown to DPLII
- audio->config.out.mixdown = HB_AMIXDOWN_DOLBYPLII;
- }
- }
- else if ( ! ( audio->config.in.channel_layout &
- HB_INPUT_CH_LAYOUT_HAS_LFE ) )
- {
- // XXX we can't mixdown & don't have any way to specify
- // 5 channel discrete output so we're hosed.
- hb_log( "ERROR - can't handle 5 channel discrete audio stream "
- "%x - output will be messed up", audio->id );
- }
- else
- {
- // we can't mixdown so force 6 channel discrete
- audio->config.out.mixdown = HB_AMIXDOWN_6CH;
- }
- break;