]> git.sesse.net Git - vlc/blobdiff - modules/codec/a52.c
Do not include vlc_modules.h in vlc_common.h
[vlc] / modules / codec / a52.c
index a21c3e75eb0210dd9d7858660ab15dfe68acdc36..da59b1664b5fd2fa22a956f82534e7e6d8c8b598 100644 (file)
@@ -1,19 +1,18 @@
 /*****************************************************************************
- * a52.c: A/52 basic parser
+ * a52.c: parse A/52 audio sync info and packetize the stream
  *****************************************************************************
- * Copyright (C) 2001-2002 VideoLAN
- * $Id: a52.c,v 1.11 2002/09/16 20:46:38 massiot Exp $
+ * Copyright (C) 2001-2002 the VideoLAN team
+ * $Id$
  *
- * Authors: Stéphane Borel <stef@via.ecp.fr>
+ * Authors: Stéphane Borel <stef@via.ecp.fr>
  *          Christophe Massiot <massiot@via.ecp.fr>
- *          Michel Lespinasse <walken@zoy.org>
- *          Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *          Gildas Bazin <gbazin@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
  * 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
  *
  * 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.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  *****************************************************************************/
 
 /*****************************************************************************
  * Preamble
  *****************************************************************************/
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>                                              /* memcpy() */
-#include <fcntl.h>
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
 
-#include <vlc/vlc.h>
-#include <vlc/decoder.h>
-#include <vlc/aout.h>
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_codec.h>
+#include <vlc_aout.h>
+#include <vlc_block_helper.h>
+#include <vlc_modules.h>
 
-#ifdef HAVE_UNISTD_H
-#   include <unistd.h>
-#endif
+#include "a52.h"
 
-#define A52_FRAME_NB 1536 
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+static int  OpenDecoder   ( vlc_object_t * );
+static int  OpenPacketizer( vlc_object_t * );
+static void CloseCommon   ( vlc_object_t * );
+
+vlc_module_begin ()
+    set_description( N_("A/52 parser") )
+    set_capability( "decoder", 100 )
+    set_callbacks( OpenDecoder, CloseCommon )
+    set_category( CAT_INPUT )
+    set_subcategory( SUBCAT_INPUT_ACODEC )
+
+    add_submodule ()
+    set_description( N_("A/52 audio packetizer") )
+    set_capability( "packetizer", 10 )
+    set_callbacks( OpenPacketizer, CloseCommon )
+vlc_module_end ()
 
 /*****************************************************************************
- * spdif_thread_t : A52 pass-through thread descriptor
+ * decoder_sys_t : decoder descriptor
  *****************************************************************************/
-typedef struct spdif_thread_s
+
+struct decoder_sys_t
 {
-    /*
-     * Thread properties
-     */
-    vlc_thread_t        thread_id;                /* id for thread functions */
+    /* Module mode */
+    bool b_packetizer;
 
     /*
      * Input properties
      */
-    decoder_fifo_t *    p_fifo;                /* stores the PES stream data */
+    int i_state;
 
-    /* The bit stream structure handles the PES stream at the bit level */
-    bit_stream_t        bit_stream;
+    block_bytestream_t bytestream;
 
     /*
-     * Output properties
+     * Common properties
      */
-    aout_instance_t *   p_aout; /* opaque */
-    aout_input_t *      p_aout_input; /* opaque */
-    audio_sample_format_t output_format;
-} spdif_thread_t;
+    date_t  end_date;
+
+    mtime_t i_pts;
+
+    vlc_a52_header_t frame;
+};
+
+enum {
+
+    STATE_NOSYNC,
+    STATE_SYNC,
+    STATE_HEADER,
+    STATE_NEXT_SYNC,
+    STATE_GET_DATA,
+    STATE_SEND_DATA
+};
 
 /****************************************************************************
  * Local prototypes
  ****************************************************************************/
-static int  OpenDecoder    ( vlc_object_t * );
-static int  RunDecoder     ( decoder_fifo_t * );
-
-static int  InitThread     ( spdif_thread_t *, decoder_fifo_t * );
-static void EndThread      ( spdif_thread_t * );
+static void *DecodeBlock  ( decoder_t *, block_t ** );
 
-static int  SyncInfo       ( const byte_t *, int *, int *, int * );
+static uint8_t       *GetOutBuffer ( decoder_t *, block_t ** );
+static aout_buffer_t *GetAoutBuffer( decoder_t * );
+static block_t       *GetSoutBuffer( decoder_t * );
 
 /*****************************************************************************
- * Module descriptor
+ * OpenCommon: probe the decoder/packetizer and return score
  *****************************************************************************/
-vlc_module_begin();
-    set_description( _("A/52 parser") );
-    set_capability( "decoder", 100 );
-    set_callbacks( OpenDecoder, NULL );
-    add_shortcut( "pass_through" );
-    add_shortcut( "pass" );
-vlc_module_end();
+static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
+{
+    decoder_t *p_dec = (decoder_t*)p_this;
+    decoder_sys_t *p_sys;
+    vlc_fourcc_t i_codec;
 
-/*****************************************************************************
- * OpenDecoder: probe the decoder and return score
- *****************************************************************************
- * Tries to launch a decoder and return score so that the interface is able 
- * to chose.
- *****************************************************************************/
-static int OpenDecoder( vlc_object_t *p_this ) 
-{   
-    decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
-
-    if( p_fifo->i_fourcc != VLC_FOURCC('a','5','2',' ')
-         && p_fifo->i_fourcc != VLC_FOURCC('a','5','2','b') )
-    {   
-        return VLC_EGENERIC; 
+    switch( p_dec->fmt_in.i_codec )
+    {
+    case VLC_CODEC_A52:
+        i_codec = VLC_CODEC_A52;
+        break;
+    case VLC_CODEC_EAC3:
+        /* XXX ugly hack, a52 does not support eac3 so no eac3 pass-through
+         * support */
+        if( !b_packetizer )
+            return VLC_EGENERIC;
+        i_codec = VLC_CODEC_EAC3;
+        break;
+    default:
+        return VLC_EGENERIC;
     }
 
-    p_fifo->pf_run = RunDecoder;
+    /* Allocate the memory needed to store the decoder's structure */
+    if( ( p_dec->p_sys = p_sys =
+          (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
+        return VLC_ENOMEM;
+
+    /* Misc init */
+    p_sys->b_packetizer = b_packetizer;
+    p_sys->i_state = STATE_NOSYNC;
+    date_Set( &p_sys->end_date, 0 );
+    p_sys->i_pts = VLC_TS_INVALID;
+
+    p_sys->bytestream = block_BytestreamInit();
+
+    /* Set output properties */
+    p_dec->fmt_out.i_cat = AUDIO_ES;
+    p_dec->fmt_out.i_codec = i_codec;
+    p_dec->fmt_out.audio.i_rate = 0; /* So end_date gets initialized */
+    p_dec->fmt_out.audio.i_bytes_per_frame = 0;
+
+    /* Set callback */
+    if( b_packetizer )
+        p_dec->pf_packetize    = (block_t *(*)(decoder_t *, block_t **))
+            DecodeBlock;
+    else
+        p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
+            DecodeBlock;
     return VLC_SUCCESS;
 }
 
+static int OpenDecoder( vlc_object_t *p_this )
+{
+    /* HACK: Don't use this codec if we don't have an a52 audio filter */
+    if( !module_exists( "a52tofloat32" ) )
+        return VLC_EGENERIC;
+    return OpenCommon( p_this, false );
+}
+
+static int OpenPacketizer( vlc_object_t *p_this )
+{
+    return OpenCommon( p_this, true );
+}
+
 /****************************************************************************
- * RunDecoder: the whole thing
+ * DecodeBlock: the whole thing
  ****************************************************************************
  * This function is called just after the thread is launched.
  ****************************************************************************/
-static int RunDecoder( decoder_fifo_t *p_fifo )
+static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 {
-    spdif_thread_t * p_dec;
-    audio_date_t end_date;
-    
-    /* Allocate the memory needed to store the thread's structure */
-    p_dec = malloc( sizeof(spdif_thread_t) );
-    if( p_dec == NULL )
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    uint8_t p_header[VLC_A52_HEADER_SIZE];
+    uint8_t *p_buf;
+    block_t *p_out_buffer;
+
+    if( !pp_block || !*pp_block ) return NULL;
+
+    if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
     {
-        msg_Err( p_fifo, "out of memory" );
-        DecoderError( p_fifo );
-        return -1;
+        if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
+        {
+            p_sys->i_state = STATE_NOSYNC;
+            block_BytestreamEmpty( &p_sys->bytestream );
+        }
+        date_Set( &p_sys->end_date, 0 );
+        block_Release( *pp_block );
+        return NULL;
     }
-  
-    if ( InitThread( p_dec, p_fifo ) )
+
+    if( !date_Get( &p_sys->end_date ) && (*pp_block)->i_pts <= VLC_TS_INVALID)
     {
-        
-        msg_Err( p_fifo, "could not initialize thread" );
-        DecoderError( p_fifo );
-        free( p_dec );
-        return -1;
+        /* We've just started the stream, wait for the first PTS. */
+        block_Release( *pp_block );
+        return NULL;
     }
 
-    /* decoder thread's main loop */
-    while ( !p_dec->p_fifo->b_die && !p_dec->p_fifo->b_error )
+    block_BytestreamPush( &p_sys->bytestream, *pp_block );
+
+    while( 1 )
     {
-        int i_frame_size, i_channels, i_rate, i_bit_rate;
-        mtime_t pts;
-        /* Temporary buffer to store the raw frame to be decoded */
-        byte_t p_header[7];
-        aout_buffer_t * p_buffer;
-
-        /* Look for sync word - should be 0x0b77 */
-        RealignBits( &p_dec->bit_stream );
-        while ( (ShowBits( &p_dec->bit_stream, 16 ) ) != 0x0b77 && 
-                (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error))
+        switch( p_sys->i_state )
         {
-            RemoveBits( &p_dec->bit_stream, 8 );
-        }
+        case STATE_NOSYNC:
+            while( block_PeekBytes( &p_sys->bytestream, p_header, 2 )
+                   == VLC_SUCCESS )
+            {
+                if( p_header[0] == 0x0b && p_header[1] == 0x77 )
+                {
+                    p_sys->i_state = STATE_SYNC;
+                    break;
+                }
+                block_SkipByte( &p_sys->bytestream );
+            }
+            if( p_sys->i_state != STATE_SYNC )
+            {
+                block_BytestreamFlush( &p_sys->bytestream );
 
-        /* Set the Presentation Time Stamp */
-        NextPTS( &p_dec->bit_stream, &pts, NULL );
-        if ( pts != 0 && pts != aout_DateGet( &end_date ) )
-        {
-            aout_DateSet( &end_date, pts );
-        }
+                /* Need more data */
+                return NULL;
+            }
 
-        /* Get A/52 frame header */
-        GetChunk( &p_dec->bit_stream, p_header, 7 );
-        if( p_dec->p_fifo->b_die ) break;
+        case STATE_SYNC:
+            /* New frame, set the Presentation Time Stamp */
+            p_sys->i_pts = p_sys->bytestream.p_block->i_pts;
+            if( p_sys->i_pts > VLC_TS_INVALID &&
+                p_sys->i_pts != date_Get( &p_sys->end_date ) )
+            {
+                date_Set( &p_sys->end_date, p_sys->i_pts );
+            }
+            p_sys->i_state = STATE_HEADER;
 
-        /* Check if frame is valid and get frame info */
-        i_frame_size = SyncInfo( p_header, &i_channels, &i_rate,
-                                 &i_bit_rate );
+        case STATE_HEADER:
+            /* Get A/52 frame header (VLC_A52_HEADER_SIZE bytes) */
+            if( block_PeekBytes( &p_sys->bytestream, p_header,
+                                 VLC_A52_HEADER_SIZE ) != VLC_SUCCESS )
+            {
+                /* Need more data */
+                return NULL;
+            }
 
-        if( !i_frame_size )
-        {
-            msg_Warn( p_dec->p_fifo, "a52_syncinfo failed" );
-            continue;
-        }
+            /* Check if frame is valid and get frame info */
+            if( vlc_a52_header_Parse( &p_sys->frame, p_header, VLC_A52_HEADER_SIZE ) )
+            {
+                msg_Dbg( p_dec, "emulated sync word" );
+                block_SkipByte( &p_sys->bytestream );
+                p_sys->i_state = STATE_NOSYNC;
+                break;
+            }
 
-        if( (p_dec->p_aout_input != NULL) &&
-            ( (p_dec->output_format.i_rate != i_rate)
-                || (p_dec->output_format.i_channels != i_channels)
-                || (p_dec->output_format.i_bytes_per_frame != i_frame_size) ) )
-        {
-            /* Parameters changed - this should not happen. */
-            aout_InputDelete( p_dec->p_aout, p_dec->p_aout_input );
-            p_dec->p_aout_input = NULL;
-        }
+            p_sys->i_state = STATE_NEXT_SYNC;
 
-        /* Creating the audio input if not created yet. */
-        if( p_dec->p_aout_input == NULL )
-        {
-            p_dec->output_format.i_rate = i_rate;
-            p_dec->output_format.i_channels = i_channels;
-            p_dec->output_format.i_bytes_per_frame = i_frame_size;
-            p_dec->output_format.i_frame_length = A52_FRAME_NB;
-            aout_DateInit( &end_date, i_rate );
-            p_dec->p_aout_input = aout_InputNew( p_dec->p_fifo,
-                                                 &p_dec->p_aout,
-                                                 &p_dec->output_format );
-
-            if ( p_dec->p_aout_input == NULL )
+        case STATE_NEXT_SYNC:
+            /* TODO: If pp_block == NULL, flush the buffer without checking the
+             * next sync word */
+
+            /* Check if next expected frame contains the sync word */
+            if( block_PeekOffsetBytes( &p_sys->bytestream,
+                                       p_sys->frame.i_size, p_header, 2 )
+                != VLC_SUCCESS )
             {
-                p_dec->p_fifo->b_error = 1;
+                /* Need more data */
+                return NULL;
+            }
+
+            if( p_sys->b_packetizer &&
+                p_header[0] == 0 && p_header[1] == 0 )
+            {
+                /* A52 wav files and audio CD's use stuffing */
+                p_sys->i_state = STATE_GET_DATA;
                 break;
             }
-        }
 
-        if ( !aout_DateGet( &end_date ) )
-        {
-            byte_t p_junk[3840];
+            if( p_header[0] != 0x0b || p_header[1] != 0x77 )
+            {
+                msg_Dbg( p_dec, "emulated sync word "
+                         "(no sync on following frame)" );
+                p_sys->i_state = STATE_NOSYNC;
+                block_SkipByte( &p_sys->bytestream );
+                break;
+            }
+            p_sys->i_state = STATE_SEND_DATA;
+            break;
 
-            /* We've just started the stream, wait for the first PTS. */
-            GetChunk( &p_dec->bit_stream, p_junk, i_frame_size - 7 );
-            continue;
-        }
+        case STATE_GET_DATA:
+            /* Make sure we have enough data.
+             * (Not useful if we went through NEXT_SYNC) */
+            if( block_WaitBytes( &p_sys->bytestream,
+                                 p_sys->frame.i_size ) != VLC_SUCCESS )
+            {
+                /* Need more data */
+                return NULL;
+            }
+            p_sys->i_state = STATE_SEND_DATA;
 
-        p_buffer = aout_BufferNew( p_dec->p_aout, p_dec->p_aout_input,
-                                   A52_FRAME_NB );
-        if ( p_buffer == NULL ) return -1;
-        p_buffer->start_date = aout_DateGet( &end_date );
-        p_buffer->end_date = aout_DateIncrement( &end_date,
-                                                 A52_FRAME_NB );
-
-        /* Get the whole frame. */
-        memcpy( p_buffer->p_buffer, p_header, 7 );
-        GetChunk( &p_dec->bit_stream, p_buffer->p_buffer + 7,
-                  i_frame_size - 7 );
-        if( p_dec->p_fifo->b_die )
-        {
-            aout_BufferDelete( p_dec->p_aout, p_dec->p_aout_input,
-                               p_buffer );
-            break;
-        }
+        case STATE_SEND_DATA:
+            if( !(p_buf = GetOutBuffer( p_dec, &p_out_buffer )) )
+            {
+                //p_dec->b_error = true;
+                return NULL;
+            }
 
-        /* Send the buffer to the mixer. */
-        aout_BufferPlay( p_dec->p_aout, p_dec->p_aout_input, p_buffer );
-    }
+            /* Copy the whole frame into the buffer. When we reach this point
+             * we already know we have enough data available. */
+            block_GetBytes( &p_sys->bytestream,
+                            p_buf, __MIN( p_sys->frame.i_size, p_out_buffer->i_buffer ) );
 
-    /* If b_error is set, the spdif thread enters the error loop */
-    if( p_dec->p_fifo->b_error )
-    {
-        DecoderError( p_dec->p_fifo );
+            /* Make sure we don't reuse the same pts twice */
+            if( p_sys->i_pts == p_sys->bytestream.p_block->i_pts )
+                p_sys->i_pts = p_sys->bytestream.p_block->i_pts = VLC_TS_INVALID;
+
+            /* So p_block doesn't get re-added several times */
+            *pp_block = block_BytestreamPop( &p_sys->bytestream );
+
+            p_sys->i_state = STATE_NOSYNC;
+
+            return p_out_buffer;
+        }
     }
 
-    /* End of the spdif decoder thread */
-    EndThread( p_dec );
-    
-    return 0;
+    return NULL;
 }
 
-/****************************************************************************
- * InitThread: initialize thread data and create output fifo
- ****************************************************************************/
-static int InitThread( spdif_thread_t * p_dec, decoder_fifo_t * p_fifo )
+/*****************************************************************************
+ * CloseCommon: clean up the decoder
+ *****************************************************************************/
+static void CloseCommon( vlc_object_t *p_this )
 {
-    /* Initialize the thread properties */
-    p_dec->p_aout = NULL;
-    p_dec->p_aout_input = NULL;
-    p_dec->p_fifo = p_fifo;
-    p_dec->output_format.i_format = AOUT_FMT_A52;
+    decoder_t *p_dec = (decoder_t*)p_this;
+    decoder_sys_t *p_sys = p_dec->p_sys;
 
-    /* Init the Bitstream */
-    InitBitstream( &p_dec->bit_stream, p_dec->p_fifo,
-                   NULL, NULL );
+    block_BytestreamRelease( &p_sys->bytestream );
 
-    return 0;
+    free( p_sys );
 }
 
 /*****************************************************************************
- * EndThread : spdif thread destruction
+ * GetOutBuffer:
  *****************************************************************************/
-static void EndThread( spdif_thread_t * p_dec )
+static uint8_t *GetOutBuffer( decoder_t *p_dec, block_t **pp_out_buffer )
 {
-    if ( p_dec->p_aout_input != NULL )
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    uint8_t *p_buf;
+
+    if( p_dec->fmt_out.audio.i_rate != p_sys->frame.i_rate )
     {
-        aout_InputDelete( p_dec->p_aout, p_dec->p_aout_input );
+        msg_Dbg( p_dec, "A/52 channels:%d samplerate:%d bitrate:%d",
+                 p_sys->frame.i_channels, p_sys->frame.i_rate, p_sys->frame.i_bitrate );
+
+        date_Init( &p_sys->end_date, p_sys->frame.i_rate, 1 );
+        date_Set( &p_sys->end_date, p_sys->i_pts );
     }
 
-    free( p_dec );
-}
+    p_dec->fmt_out.audio.i_rate     = p_sys->frame.i_rate;
+    p_dec->fmt_out.audio.i_channels = p_sys->frame.i_channels;
+    if( p_dec->fmt_out.audio.i_bytes_per_frame < p_sys->frame.i_size )
+        p_dec->fmt_out.audio.i_bytes_per_frame = p_sys->frame.i_size;
+    p_dec->fmt_out.audio.i_frame_length = p_sys->frame.i_samples;
 
-/****************************************************************************
- * SyncInfo: parse A52 sync info
- ****************************************************************************
- * This code is borrowed from liba52 by Aaron Holtzman & Michel Lespinasse,
- * since we don't want to oblige S/PDIF people to use liba52 just to get
- * their SyncInfo...
- ****************************************************************************/
-int SyncInfo( const byte_t * p_buf, int * pi_channels, int * pi_sample_rate,
-              int * pi_bit_rate)
-{
-    static const u8 halfrate[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3};
-    static const int rate[] = { 32,  40,  48,  56,  64,  80,  96, 112,
-                                128, 160, 192, 224, 256, 320, 384, 448,
-                                512, 576, 640};
-    static const u8 lfeon[8] = {0x10, 0x10, 0x04, 0x04, 0x04, 0x01, 0x04, 0x01};
-    int frmsizecod;
-    int bitrate;
-    int half;
-    int acmod;
-
-    if ((p_buf[0] != 0x0b) || (p_buf[1] != 0x77))        /* syncword */
-        return 0;
-
-    if (p_buf[5] >= 0x60)                /* bsid >= 12 */
-        return 0;
-    half = halfrate[p_buf[5] >> 3];
-
-    /* acmod, dsurmod and lfeon */
-    acmod = p_buf[6] >> 5;
-    if ( p_buf[6] & 0xf8 )
+    p_dec->fmt_out.audio.i_original_channels = p_sys->frame.i_channels_conf;
+    p_dec->fmt_out.audio.i_physical_channels =
+        p_sys->frame.i_channels_conf & AOUT_CHAN_PHYSMASK;
+
+    p_dec->fmt_out.i_bitrate = p_sys->frame.i_bitrate;
+
+    if( p_sys->b_packetizer )
     {
-        *pi_channels = AOUT_CHAN_DOLBY;
+        block_t *p_sout_buffer = GetSoutBuffer( p_dec );
+        p_buf = p_sout_buffer ? p_sout_buffer->p_buffer : NULL;
+        *pp_out_buffer = p_sout_buffer;
     }
-    else switch ( acmod )
+    else
     {
-    case 0x0: *pi_channels = AOUT_CHAN_CHANNEL; break;
-    case 0x1: *pi_channels = AOUT_CHAN_MONO; break;
-    case 0x2: *pi_channels = AOUT_CHAN_STEREO; break;
-    case 0x3: *pi_channels = AOUT_CHAN_3F; break;
-    case 0x4: *pi_channels = AOUT_CHAN_2F1R; break;
-    case 0x5: *pi_channels = AOUT_CHAN_3F1R; break;
-    case 0x6: *pi_channels = AOUT_CHAN_2F2R; break;
-    case 0x7: *pi_channels = AOUT_CHAN_3F2R; break;
-    case 0x8: *pi_channels = AOUT_CHAN_CHANNEL1; break;
-    case 0x9: *pi_channels = AOUT_CHAN_CHANNEL2; break;
-    }
-   
-    if ( p_buf[6] & lfeon[acmod] ) *pi_channels |= AOUT_CHAN_LFE;
-
-    frmsizecod = p_buf[4] & 63;
-    if (frmsizecod >= 38)
-        return 0;
-    bitrate = rate [frmsizecod >> 1];
-    *pi_bit_rate = (bitrate * 1000) >> half;
-
-    switch (p_buf[4] & 0xc0) {
-    case 0:
-        *pi_sample_rate = 48000 >> half;
-        return 4 * bitrate;
-    case 0x40:
-        *pi_sample_rate = 44100 >> half;
-        return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
-    case 0x80:
-        *pi_sample_rate = 32000 >> half;
-        return 6 * bitrate;
-    default:
-        return 0;
+        aout_buffer_t *p_aout_buffer = GetAoutBuffer( p_dec );
+        p_buf = p_aout_buffer ? p_aout_buffer->p_buffer : NULL;
+        *pp_out_buffer = p_aout_buffer;
     }
+
+    return p_buf;
+}
+
+/*****************************************************************************
+ * GetAoutBuffer:
+ *****************************************************************************/
+static aout_buffer_t *GetAoutBuffer( decoder_t *p_dec )
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    aout_buffer_t *p_buf;
+
+    p_buf = decoder_NewAudioBuffer( p_dec, p_sys->frame.i_samples );
+    if( p_buf == NULL ) return NULL;
+
+    p_buf->i_pts = date_Get( &p_sys->end_date );
+    p_buf->i_length = date_Increment( &p_sys->end_date,
+                                      p_sys->frame.i_samples ) - p_buf->i_pts;
+
+    return p_buf;
+}
+
+/*****************************************************************************
+ * GetSoutBuffer:
+ *****************************************************************************/
+static block_t *GetSoutBuffer( decoder_t *p_dec )
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    block_t *p_block;
+
+    p_block = block_New( p_dec, p_sys->frame.i_size );
+    if( p_block == NULL ) return NULL;
+
+    p_block->i_pts = p_block->i_dts = date_Get( &p_sys->end_date );
+
+    p_block->i_length =
+        date_Increment( &p_sys->end_date, p_sys->frame.i_samples ) - p_block->i_pts;
+
+    return p_block;
 }