Fix DVD LPCM format description in comments.

[vlc] / modules / codec / lpcm.c

diff --git a/modules/codec/lpcm.c b/modules/codec/lpcm.c
index b209d24e16aff7d7404f2ba0c047abfe205615b3..3928065a37727e112461510d4aad70ef40cd7a9b 100644 (file)
--- a/modules/codec/lpcm.c
+++ b/modules/codec/lpcm.c
@@ -81,15 +81,17 @@ struct decoder_sys_t
 
 /*
  * LPCM DVD header :
- * - frame number (8 bits)
- * - unknown (16 bits) == 0x0003 ?
- * - unknown (4 bits)
- * - current frame (4 bits)
- * - unknown (2 bits)
- * - frequency (2 bits) 0 == 48 kHz, 1 == 32 kHz, 2 == ?, 3 == ?
- * - unknown (1 bit)
+ * - number of frames in this packet (8 bits)
+ * - first access unit (16 bits) == 0x0003 ?
+ * - emphasis (1 bit)
+ * - mute (1 bit)
+ * - reserved (1 bit)
+ * - current frame (5 bits)
+ * - quantisation (2 bits) 0 == 16bps, 1 == 20bps, 2 == 24bps, 3 == illegal
+ * - frequency (2 bits) 0 == 48 kHz, 1 == 96 kHz, 2 == 44.1 kHz, 3 == 32 kHz
+ * - reserved (1 bit)
  * - number of channels - 1 (3 bits) 1 == 2 channels
- * - start code (8 bits) == 0x80
+ * - dynamic range (8 bits) 0x80 == neutral
  *
  * LPCM DVD-A header (http://dvd-audio.sourceforge.net/spec/aob.shtml)
  * - continuity counter (8 bits, clipped to 0x00-0x1f)
@@ -268,7 +270,7 @@ static void *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
     *pp_block = NULL; /* So the packet doesn't get re-sent */
 
     /* Date management */
-    if( p_block->i_pts > 0 &&
+    if( p_block->i_pts > VLC_TS_INVALID &&
         p_block->i_pts != date_Get( &p_sys->end_date ) )
     {
         date_Set( &p_sys->end_date, p_block->i_pts );
@@ -307,7 +309,7 @@ static void *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
                           p_block->p_buffer );
         break;
     default:
-        assert(0);
+        abort();
     }
 
     if( i_ret || p_block->i_buffer <= p_sys->i_header_size + i_padding )