Added LPCM support. It should work with stereo LPCM.
Untested with 5-ways LPCM streams.

Makefile

@@ -77,7 +77,6 @@ AC3_SPDIF :=	src/ac3_spdif/ac3_spdif.o \
 		src/ac3_spdif/ac3_iec958.o
 
 LPCM_DECODER :=	src/lpcm_decoder/lpcm_decoder_thread.o \
-		src/lpcm_decoder/lpcm_decoder.o
 
 AUDIO_DECODER :=	src/audio_decoder/audio_decoder.o \
 			src/audio_decoder/adec_generic.o \

TODO

@@ -56,7 +56,7 @@ Description: Cope with vls/vlc clock jitter
  The internal clocks of the server and the client are not assured to be
  in perfect synchronization, which may be annoying when playing a movie.
  Reduce this jitter by using a well-chosen filter.
-Status: Todo
+Status: Done 1 May 2001 (henri)
 
 Task: 0x58
 Difficulty: Medium
@@ -541,7 +541,7 @@ Urgency: Normal
 Description: LPCM decoder
  The LPCM decoder is full of stubs, it only parses the stream
  but does not decode it. Fix this.
-Status: Todo
+Status: Done 12 Jun 2001 (henri)
 
 Task: 0x1c
 Difficulty: Guru

src/lpcm_decoder/lpcm_decoder.c

-/*****************************************************************************
- * lpcm_decoder.c: core lpcm decoder
- *****************************************************************************
- * Copyright (C) 1999, 2000 VideoLAN
- * $Id: lpcm_decoder.c,v 1.7 2001/04/06 09:15:48 sam Exp $
- *
- * Authors: Samuel Hocevar <sam@zoy.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
- *****************************************************************************/
-#include "defs.h"
-
-#include <stdio.h>
-#include <string.h>                                    /* memcpy(), memset() */
-
-#include "config.h"
-#include "common.h"
-#include "threads.h"
-#include "mtime.h"
-
-#include "intf_msg.h"
-
-//#include "int_types.h"
-#include "lpcm_decoder.h"
-
-int lpcm_init (lpcmdec_t * p_lpcmdec)
-{
-    intf_DbgMsg( "LPCM Debug: lpmcm init called" );
-    return 0;
-}
-
-int lpcm_decode_frame (lpcmdec_t * p_lpcmdec, s16 * buffer)
-{
-/*
- * XXX was part of ac3dec, is to change
-    
-    int i;
-
-    if (parse_bsi (p_ac3dec))
-        return 1;
-
-    for (i = 0; i < 6; i++) {
-        if (parse_audblk (p_ac3dec, i))
-            return 1;
-        if (exponent_unpack (p_ac3dec))
-            return 1;
-        bit_allocate (p_ac3dec);
-        mantissa_unpack (p_ac3dec);
-        if  (p_ac3dec->bsi.acmod == 0x2)
-            rematrix (p_ac3dec);
-        imdct (p_ac3dec);
-        downmix (p_ac3dec, buffer);
-
-        buffer += 2*256;
-    }
-
-    parse_auxdata (p_ac3dec);
-*/
-    
-    return 0;
-}

src/lpcm_decoder/lpcm_decoder.h

-/*****************************************************************************
- * lpcm_decoder.h : lpcm decoder interface
- *****************************************************************************
- * Copyright (C) 1999, 2000 VideoLAN
- * $Id: lpcm_decoder.h,v 1.3 2001/03/21 13:42:34 sam Exp $
- *
- * Authors: Samuel Hocevar <sam@zoy.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- *****************************************************************************/
-
-typedef struct lpcmdec_s lpcmdec_t;
-
-typedef struct lpcm_sync_info_s {
-    int sample_rate;    /* sample rate in Hz */
-    int frame_size;     /* frame size in bytes */
-    int bit_rate;       /* nominal bit rate in kbps */
-} lpcm_sync_info_t;
-
-typedef struct lpcm_byte_stream_s {
-    u8 * p_byte;
-    u8 * p_end;
-    void * info;
-} lpcm_byte_stream_t;
-
-
-int lpcm_init (lpcmdec_t * p_lpcmdec);
-int lpcm_sync_frame (lpcmdec_t * p_lpcmdec, lpcm_sync_info_t * p_sync_info);
-int lpcm_decode_frame (lpcmdec_t * p_lcpmdec, s16 * buffer);
-//static lpcm_byte_stream_t * lpcm_byte_stream (lcpmdec_t * p_lpcmdec);
-
-
-void lpcm_byte_stream_next (lpcm_byte_stream_t * p_byte_stream);
-
-typedef struct lpcm_bit_stream_s {
-    u32 buffer;
-    int i_available;
-    lpcm_byte_stream_t byte_stream;
-
-} lpcm_bit_stream_t;
-
-struct lpcmdec_s {
-    /*
-     * Input properties
-     */
-
-    /* The bit stream structure handles the PES stream at the bit level */
-    lpcm_bit_stream_t bit_stream;
-};
-
-
-static lpcm_byte_stream_t * lpcm_byte_stream (lpcmdec_t * p_lpcmdec)
-{
-    return &(p_lpcmdec->bit_stream.byte_stream);
-}

src/lpcm_decoder/lpcm_decoder_thread.c

@@ -2,9 +2,10 @@
  * lpcm_decoder_thread.c: lpcm decoder thread
  *****************************************************************************
  * Copyright (C) 1999, 2000 VideoLAN
- * $Id: lpcm_decoder_thread.c,v 1.15 2001/05/31 01:37:08 sam Exp $
+ * $Id: lpcm_decoder_thread.c,v 1.16 2001/06/12 13:50:09 henri Exp $
  *
  * Authors: Samuel Hocevar <sam@zoy.org>
+ *          Henri Fallon <henri@videolan.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -46,11 +47,8 @@
 
 #include "audio_output.h"
 
-#include "lpcm_decoder.h"
 #include "lpcm_decoder_thread.h"
 
-#define LPCMDEC_FRAME_SIZE (2*1536)                        /* May be useless */
-
 /*****************************************************************************
  * Local prototypes
  *****************************************************************************/
@@ -62,14 +60,16 @@ static void     EndThread               (lpcmdec_thread_t * p_adec);
 /*****************************************************************************
  * lpcmdec_CreateThread: creates an lpcm decoder thread
  *****************************************************************************/
-vlc_thread_t lpcmdec_CreateThread (adec_config_t * p_config)
+vlc_thread_t lpcmdec_CreateThread( adec_config_t * p_config )
 {
     lpcmdec_thread_t *   p_lpcmdec;
-    intf_DbgMsg ( "lpcm: creating lpcm decoder thread" );
+    intf_DbgMsg( "LPCM: creating lpcm decoder thread" );
 
     /* Allocate the memory needed to store the thread's structure */
-    if ((p_lpcmdec = (lpcmdec_thread_t *)malloc (sizeof(lpcmdec_thread_t))) == NULL) {
-        intf_ErrMsg ( "lpcm error: cannot create lpcmdec_thread_t" );
+    if( (p_lpcmdec = (lpcmdec_thread_t *)malloc (sizeof(lpcmdec_thread_t)) )
+            == NULL) 
+    {
+        intf_ErrMsg( "LPCM : error : cannot create lpcmdec_thread_t" );
         return 0;
     }
 
@@ -79,23 +79,21 @@ vlc_thread_t lpcmdec_CreateThread (adec_config_t * p_config)
     p_lpcmdec->p_config = p_config;
     p_lpcmdec->p_fifo = p_config->decoder_config.p_decoder_fifo;
 
-
-    /* Initialize the lpcm decoder structures */
-    lpcm_init (&p_lpcmdec->lpcm_decoder);
-
     /*
      * Initialize the output properties
      */
     p_lpcmdec->p_aout_fifo = NULL;
 
     /* Spawn the lpcm decoder thread */
-    if (vlc_thread_create(&p_lpcmdec->thread_id, "lpcm decoder", (vlc_thread_func_t)RunThread, (void *)p_lpcmdec)) {
-        intf_ErrMsg  ( "lpcm error: cannot spawn thread" );
+    if( vlc_thread_create( &p_lpcmdec->thread_id, "lpcm decoder", 
+                           (vlc_thread_func_t)RunThread, (void *)p_lpcmdec ) )
+    {
+        intf_ErrMsg( "LPCM : error : cannot spawn thread" );
         free (p_lpcmdec);
         return 0;
     }
 
-    intf_DbgMsg ( "LPCM Debug: lpcm decoder thread (%p) created", p_lpcmdec );
+    intf_DbgMsg( "LPCM Debug: lpcm decoder thread (%p) created\n", p_lpcmdec );
     return p_lpcmdec->thread_id;
 }
 
@@ -106,37 +104,44 @@ vlc_thread_t lpcmdec_CreateThread (adec_config_t * p_config)
  *****************************************************************************/
 static int InitThread (lpcmdec_thread_t * p_lpcmdec)
 {
-    lpcm_byte_stream_t * byte_stream;
 
-    intf_DbgMsg ( "LPCM Debug: initializing lpcm decoder thread %p", p_lpcmdec );
+    intf_DbgMsg ( "lpcm Debug: initializing lpcm decoder thread %p", 
+                   p_lpcmdec );
 
     /* Our first job is to initialize the bit stream structure with the
      * beginning of the input stream */
     vlc_mutex_lock (&p_lpcmdec->p_fifo->data_lock);
-    while (DECODER_FIFO_ISEMPTY(*p_lpcmdec->p_fifo)) {
-        if (p_lpcmdec->p_fifo->b_die) {
+    
+    while (DECODER_FIFO_ISEMPTY(*p_lpcmdec->p_fifo)) 
+    {
+        if (p_lpcmdec->p_fifo->b_die) 
+        {
             vlc_mutex_unlock (&p_lpcmdec->p_fifo->data_lock);
             return -1;
         }
-        vlc_cond_wait (&p_lpcmdec->p_fifo->data_wait, &p_lpcmdec->p_fifo->data_lock);
+        vlc_cond_wait (&p_lpcmdec->p_fifo->data_wait, 
+                       &p_lpcmdec->p_fifo->data_lock);
     }
+  
     p_lpcmdec->p_data = DECODER_FIFO_START (*p_lpcmdec->p_fifo)->p_first;
-    byte_stream = lpcm_byte_stream (&p_lpcmdec->lpcm_decoder);
-    byte_stream->p_byte = p_lpcmdec->p_data->p_payload_start;
-    byte_stream->p_end = p_lpcmdec->p_data->p_payload_end;
-    byte_stream->info = p_lpcmdec;
+    
     vlc_mutex_unlock (&p_lpcmdec->p_fifo->data_lock);
+    /* Init the BitStream */
+    p_lpcmdec->p_config->decoder_config.pf_init_bit_stream(
+            &p_lpcmdec->bit_stream,
+            p_lpcmdec->p_config->decoder_config.p_decoder_fifo,
+            NULL, NULL);
 
     /* Creating the audio output fifo */
-    p_lpcmdec->p_aout_fifo = aout_CreateFifo( AOUT_ADEC_STEREO_FIFO, 2, 0, 0,
-                                              LPCMDEC_FRAME_SIZE, NULL  );
+    p_lpcmdec->p_aout_fifo = aout_CreateFifo( AOUT_ADEC_STEREO_FIFO, 2, 48000,
+                                            0, LPCMDEC_FRAME_SIZE/2, NULL  );
     if ( p_lpcmdec->p_aout_fifo == NULL )
     {
         return -1;
     }
-
-    intf_DbgMsg ( "LPCM Debug: lpcm decoder thread %p initialized", p_lpcmdec );
-    return 0;
+    intf_DbgMsg( "LPCM Debug: lpcm decoder thread %p initialized\n", 
+                 p_lpcmdec );
+    return( 0 );
 }
 
 /*****************************************************************************
@@ -144,12 +149,8 @@ static int InitThread (lpcmdec_thread_t * p_lpcmdec)
  *****************************************************************************/
 static void RunThread (lpcmdec_thread_t * p_lpcmdec)
 {
-    int sync;
-
-    intf_DbgMsg( "LPCM Debug: running lpcm decoder thread (%p) (pid== %i)", p_lpcmdec, getpid() );
-
-    /* Fucking holy piece of shit ! */
-    //msleep (INPUT_PTS_DELAY);
+    intf_DbgMsg( "LPCM Debug: running lpcm decoder thread (%p) (pid== %i)", 
+                 p_lpcmdec, getpid() );
 
     /* Initializing the lpcm decoder thread */
     if (InitThread (p_lpcmdec)) 
@@ -157,51 +158,56 @@ static void RunThread (lpcmdec_thread_t * p_lpcmdec)
         p_lpcmdec->p_fifo->b_error = 1;
     }
 
-    sync = 0;
-    p_lpcmdec->sync_ptr = 0;
-
     /* lpcm decoder thread's main loop */
-    /* FIXME : do we have enough room to store the decoded frames ?? */
    
     while ((!p_lpcmdec->p_fifo->b_die) && (!p_lpcmdec->p_fifo->b_error))
     {
-        s16 * buffer;
-        lpcm_sync_info_t sync_info;
-
-        if (!sync)
-        {
-            /* have to find a synchro point */
-        }
+        byte_t * buffer,p_temp[LPCMDEC_FRAME_SIZE];
+        int i_loop;
+        byte_t byte1, byte2;
     
-        if (DECODER_FIFO_START(*p_lpcmdec->p_fifo)->i_pts)
+        if( DECODER_FIFO_START(*p_lpcmdec->p_fifo)->i_pts )
         {
-            p_lpcmdec->p_aout_fifo->date[p_lpcmdec->p_aout_fifo->l_end_frame] = DECODER_FIFO_START(*p_lpcmdec->p_fifo)->i_pts;
+            p_lpcmdec->p_aout_fifo->date[p_lpcmdec->p_aout_fifo->l_end_frame] =
+                DECODER_FIFO_START(*p_lpcmdec->p_fifo)->i_pts;
             DECODER_FIFO_START(*p_lpcmdec->p_fifo)->i_pts = 0;
         }
         else
-        {
-            p_lpcmdec->p_aout_fifo->date[p_lpcmdec->p_aout_fifo->l_end_frame] = LAST_MDATE;
+        { 
+            p_lpcmdec->p_aout_fifo->date[p_lpcmdec->p_aout_fifo->l_end_frame] =
+                LAST_MDATE;
         }
 
-        p_lpcmdec->p_aout_fifo->l_rate = sync_info.sample_rate;
-
-        buffer = ((s16 *)p_lpcmdec->p_aout_fifo->buffer) + (p_lpcmdec->p_aout_fifo->l_end_frame * LPCMDEC_FRAME_SIZE);
-
-        if (lpcm_decode_frame (&p_lpcmdec->lpcm_decoder, buffer))
+        buffer = ((byte_t *)p_lpcmdec->p_aout_fifo->buffer) + 
+                  (p_lpcmdec->p_aout_fifo->l_end_frame * LPCMDEC_FRAME_SIZE);
+    
+        byte1 = GetBits(&p_lpcmdec->bit_stream, 8);
+        byte2 = GetBits(&p_lpcmdec->bit_stream, 8);
+        
+        /* Get the sync word : 0x0180 */
+        while( ( byte1 != 0x01 || byte2 != 0x80 ) && (!p_lpcmdec->p_fifo->b_die)
+                                           && (!p_lpcmdec->p_fifo->b_error) )
         {
-            sync = 0;
-            goto bad_frame;
+            byte1 = byte2;
+            byte2 = GetBits(&p_lpcmdec->bit_stream, 8);
         }
-
+        
+        GetChunk( &p_lpcmdec->bit_stream, p_temp, LPCMDEC_FRAME_SIZE);
+        
+        for( i_loop = 0; i_loop < LPCMDEC_FRAME_SIZE/2; i_loop++ )
+        {
+            buffer[2*i_loop]=p_temp[2*i_loop+1];
+            buffer[2*i_loop+1]=p_temp[2*i_loop];
+        }
+        
         vlc_mutex_lock (&p_lpcmdec->p_aout_fifo->data_lock);
-        p_lpcmdec->p_aout_fifo->l_end_frame = (p_lpcmdec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
+        p_lpcmdec->p_aout_fifo->l_end_frame = 
+            (p_lpcmdec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
         vlc_cond_signal (&p_lpcmdec->p_aout_fifo->data_wait);
         vlc_mutex_unlock (&p_lpcmdec->p_aout_fifo->data_lock);
-
+        
         intf_DbgMsg( "LPCM Debug: %x", *buffer );
 
-    bad_frame:
-        continue;
     }
 
     /* If b_error is set, the lpcm decoder thread enters the error loop */
@@ -217,56 +223,52 @@ static void RunThread (lpcmdec_thread_t * p_lpcmdec)
 /*****************************************************************************
  * ErrorThread : lpcm decoder's RunThread() error loop
  *****************************************************************************/
-static void ErrorThread (lpcmdec_thread_t * p_lpcmdec)
+static void ErrorThread( lpcmdec_thread_t * p_lpcmdec )
 {
     /* We take the lock, because we are going to read/write the start/end
      * indexes of the decoder fifo */
-    vlc_mutex_lock (&p_lpcmdec->p_fifo->data_lock);
+    vlc_mutex_lock( &p_lpcmdec->p_fifo->data_lock );
 
     /* Wait until a `die' order is sent */
-    while (!p_lpcmdec->p_fifo->b_die) {
+    while( !p_lpcmdec->p_fifo->b_die ) 
+    {
         /* Trash all received PES packets */
-        while (!DECODER_FIFO_ISEMPTY(*p_lpcmdec->p_fifo)) {
-            p_lpcmdec->p_fifo->pf_delete_pes(p_lpcmdec->p_fifo->p_packets_mgt,
-                    DECODER_FIFO_START(*p_lpcmdec->p_fifo));
-            DECODER_FIFO_INCSTART (*p_lpcmdec->p_fifo);
+        while( !DECODER_FIFO_ISEMPTY(*p_lpcmdec->p_fifo) ) 
+        {
+            p_lpcmdec->p_fifo->pf_delete_pes( p_lpcmdec->p_fifo->p_packets_mgt,
+                    DECODER_FIFO_START(*p_lpcmdec->p_fifo ));
+            DECODER_FIFO_INCSTART( *p_lpcmdec->p_fifo );
         }
 
         /* Waiting for the input thread to put new PES packets in the fifo */
-        vlc_cond_wait (&p_lpcmdec->p_fifo->data_wait, &p_lpcmdec->p_fifo->data_lock);
+        vlc_cond_wait ( &p_lpcmdec->p_fifo->data_wait, 
+                        &p_lpcmdec->p_fifo->data_lock );
     }
 
     /* We can release the lock before leaving */
-    vlc_mutex_unlock (&p_lpcmdec->p_fifo->data_lock);
+    vlc_mutex_unlock( &p_lpcmdec->p_fifo->data_lock );
 }
 
 /*****************************************************************************
  * EndThread : lpcm decoder thread destruction
  *****************************************************************************/
-static void EndThread (lpcmdec_thread_t * p_lpcmdec)
+static void EndThread( lpcmdec_thread_t * p_lpcmdec )
 {
     intf_DbgMsg( "LPCM Debug: destroying lpcm decoder thread %p", p_lpcmdec );
 
     /* If the audio output fifo was created, we destroy it */
-    if (p_lpcmdec->p_aout_fifo != NULL) {
-        aout_DestroyFifo (p_lpcmdec->p_aout_fifo);
+    if( p_lpcmdec->p_aout_fifo != NULL ) 
+    {
+        aout_DestroyFifo( p_lpcmdec->p_aout_fifo );
 
         /* Make sure the output thread leaves the NextFrame() function */
-        vlc_mutex_lock (&(p_lpcmdec->p_aout_fifo->data_lock));
-        vlc_cond_signal (&(p_lpcmdec->p_aout_fifo->data_wait));
-        vlc_mutex_unlock (&(p_lpcmdec->p_aout_fifo->data_lock));
+        vlc_mutex_lock( &(p_lpcmdec->p_aout_fifo->data_lock) );
+        vlc_cond_signal( &(p_lpcmdec->p_aout_fifo->data_wait) );
+        vlc_mutex_unlock( &(p_lpcmdec->p_aout_fifo->data_lock) );
     }
 
     /* Destroy descriptor */
-    free (p_lpcmdec);
+    free( p_lpcmdec );
 
     intf_DbgMsg( "LPCM Debug: lpcm decoder thread %p destroyed", p_lpcmdec );
 }
-
-void lpcm_byte_stream_next (lpcm_byte_stream_t * p_byte_stream)
-{
-//    lpcmdec_thread_t * p_lpcmdec = p_byte_stream->info;
-
-    /* We are looking for the next TS packet that contains real data,
-     * and not just a PES header */
-}

src/lpcm_decoder/lpcm_decoder_thread.h

@@ -2,7 +2,7 @@
  * lpcm_decoder_thread.h : lpcm decoder thread interface
  *****************************************************************************
  * Copyright (C) 1999, 2000 VideoLAN
- * $Id: lpcm_decoder_thread.h,v 1.5 2001/05/01 04:18:18 sam Exp $
+ * $Id: lpcm_decoder_thread.h,v 1.6 2001/06/12 13:50:09 henri Exp $
  *
  * Authors: Samuel Hocevar <sam@zoy.org>
  *
@@ -22,6 +22,8 @@
  * Boston, MA 02111-1307, USA.
  *****************************************************************************/
 
+#define LPCMDEC_FRAME_SIZE (2008)
+
 /*****************************************************************************
  * lpcmdec_thread_t : lpcm decoder thread descriptor
  *****************************************************************************/
@@ -40,20 +42,17 @@ typedef struct lpcmdec_thread_s
     int                 sync_ptr;         /* sync ptr from lpcm magic header */
     adec_config_t *     p_config;
 
-    /*
-     * Decoder properties
-     */
-    lpcmdec_t            lpcm_decoder;
-
     /*
      * Output properties
      */
     aout_fifo_t *       p_aout_fifo; /* stores the decompressed audio frames */
 
+    /* The bit stream structure handles the PES stream at the bit level */
+    bit_stream_t bit_stream;
+
 } lpcmdec_thread_t;
 
 /*****************************************************************************
  * Prototypes
  *****************************************************************************/
 vlc_thread_t            lpcmdec_CreateThread( adec_config_t * p_config );
-