/*****************************************************************************
- * lpcm.c: lpcm decoder module
+ * lpcm.c: lpcm decoder/packetizer module
*****************************************************************************
- * Copyright (C) 1999-2001 VideoLAN
- * $Id: lpcm.c,v 1.7 2002/11/14 22:38:47 massiot Exp $
+ * Copyright (C) 1999-2005 the VideoLAN team
+ * $Id$
*
* Authors: Samuel Hocevar <sam@zoy.org>
* Henri Fallon <henri@videolan.org>
+ * Christophe Massiot <massiot@via.ecp.fr>
+ * 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 <stdlib.h> /* malloc(), free() */
-#include <string.h> /* memcpy(), memset() */
-
#include <vlc/vlc.h>
-#include <vlc/aout.h>
-#include <vlc/decoder.h>
-#include <input_ext-dec.h>
-
-#ifdef HAVE_UNISTD_H
-# include <unistd.h> /* getpid() */
-#endif
-
-#define LPCM_FRAME_NB 502
+#include <vlc_codec.h>
+#include <vlc_aout.h>
/*****************************************************************************
- * dec_thread_t : lpcm decoder thread descriptor
+ * decoder_sys_t : lpcm decoder descriptor
*****************************************************************************/
-typedef struct dec_thread_t
+struct decoder_sys_t
{
- /*
- * Thread properties
- */
- vlc_thread_t thread_id; /* id for thread functions */
-
- /*
- * Input properties
- */
- decoder_fifo_t * p_fifo; /* stores the PES stream data */
- bit_stream_t bit_stream;
- int sync_ptr; /* sync ptr from lpcm magic header */
+ /* Module mode */
+ vlc_bool_t b_packetizer;
/*
* Output properties
*/
- aout_instance_t *p_aout;
- aout_input_t *p_aout_input;
- audio_sample_format_t output_format;
- audio_date_t end_date;
-} dec_thread_t;
+ audio_date_t end_date;
+
+};
+
+/*
+ * LPCM header :
+ * - PES header
+ * - private stream ID (16 bits) == 0xA0 -> not in the bitstream
+ *
+ * - 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 channels - 1 (3 bits) 1 == 2 channels
+ * - start code (8 bits) == 0x80
+ */
+
+#define LPCM_HEADER_LEN 6
/*****************************************************************************
* Local prototypes
*****************************************************************************/
-static int OpenDecoder ( vlc_object_t * );
-static int RunDecoder ( decoder_fifo_t * );
+static int OpenDecoder ( vlc_object_t * );
+static int OpenPacketizer( vlc_object_t * );
+static void CloseDecoder ( vlc_object_t * );
- void DecodeFrame ( dec_thread_t * );
-// static int InitThread ( dec_thread_t * );
-static void EndThread ( dec_thread_t * );
+static void *DecodeFrame ( decoder_t *, block_t ** );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin();
- set_description( _("linear PCM audio parser") );
+
+ set_category( CAT_INPUT );
+ set_subcategory( SUBCAT_INPUT_ACODEC );
+ set_description( _("Linear PCM audio decoder") );
set_capability( "decoder", 100 );
- set_callbacks( OpenDecoder, NULL );
+ set_callbacks( OpenDecoder, CloseDecoder );
+
+ add_submodule();
+ set_description( _("Linear PCM audio packetizer") );
+ set_capability( "packetizer", 100 );
+ set_callbacks( OpenPacketizer, CloseDecoder );
+
vlc_module_end();
/*****************************************************************************
*****************************************************************************/
static int OpenDecoder( vlc_object_t *p_this )
{
- decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
+ decoder_t *p_dec = (decoder_t*)p_this;
+ decoder_sys_t *p_sys;
- if( p_fifo->i_fourcc != VLC_FOURCC('l','p','c','m')
- && p_fifo->i_fourcc != VLC_FOURCC('l','p','c','b') )
- {
+ if( p_dec->fmt_in.i_codec != VLC_FOURCC('l','p','c','m')
+ && p_dec->fmt_in.i_codec != VLC_FOURCC('l','p','c','b') )
+ {
+ return VLC_EGENERIC;
+ }
+
+ /* 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 )
+ {
+ msg_Err( p_dec, "out of memory" );
return VLC_EGENERIC;
}
-
- p_fifo->pf_run = RunDecoder;
+
+ /* Misc init */
+ p_sys->b_packetizer = VLC_FALSE;
+ aout_DateSet( &p_sys->end_date, 0 );
+
+ /* Set output properties */
+ p_dec->fmt_out.i_cat = AUDIO_ES;
+
+ if( p_dec->fmt_out.audio.i_bitspersample == 24 )
+ {
+ p_dec->fmt_out.i_codec = VLC_FOURCC('s','2','4','b');
+ }
+ else
+ {
+ p_dec->fmt_out.i_codec = VLC_FOURCC('s','1','6','b');
+ p_dec->fmt_out.audio.i_bitspersample = 16;
+ }
+
+ /* Set callback */
+ p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
+ DecodeFrame;
+ p_dec->pf_packetize = (block_t *(*)(decoder_t *, block_t **))
+ DecodeFrame;
+
return VLC_SUCCESS;
}
+static int OpenPacketizer( vlc_object_t *p_this )
+{
+ decoder_t *p_dec = (decoder_t*)p_this;
+
+ int i_ret = OpenDecoder( p_this );
+
+ if( i_ret != VLC_SUCCESS ) return i_ret;
+
+ p_dec->p_sys->b_packetizer = VLC_TRUE;
+
+ p_dec->fmt_out.i_codec = VLC_FOURCC('l','p','c','m');
+
+ return i_ret;
+}
+
/*****************************************************************************
- * RunDecoder: the lpcm decoder
+ * DecodeFrame: decodes an lpcm frame.
+ ****************************************************************************
+ * Beware, this function must be fed with complete frames (PES packet).
*****************************************************************************/
-static int RunDecoder( decoder_fifo_t * p_fifo )
+static void *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
{
- dec_thread_t * p_dec;
+ decoder_sys_t *p_sys = p_dec->p_sys;
+ block_t *p_block;
+ unsigned int i_rate = 0, i_original_channels = 0, i_channels = 0;
+ int i_frame_length, i_bitspersample;
+ uint8_t i_header;
+
+ if( !pp_block || !*pp_block ) return NULL;
+
+ p_block = *pp_block;
+ *pp_block = NULL; /* So the packet doesn't get re-sent */
- /* Allocate the memory needed to store the thread's structure */
- if( (p_dec = (dec_thread_t *)malloc (sizeof(dec_thread_t)) )
- == NULL)
+ /* Date management */
+ if( p_block->i_pts > 0 &&
+ p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
{
- msg_Err( p_fifo, "out of memory" );
- DecoderError( p_fifo );
- return -1;
+ aout_DateSet( &p_sys->end_date, p_block->i_pts );
}
- /* Initialize the thread properties */
- p_dec->p_fifo = p_fifo;
+ if( !aout_DateGet( &p_sys->end_date ) )
+ {
+ /* We've just started the stream, wait for the first PTS. */
+ block_Release( p_block );
+ return NULL;
+ }
- /* Init the bitstream */
- if( InitBitstream( &p_dec->bit_stream, p_dec->p_fifo,
- NULL, NULL ) != VLC_SUCCESS )
+ if( p_block->i_buffer <= LPCM_HEADER_LEN )
{
- msg_Err( p_fifo, "cannot initialize bitstream" );
- DecoderError( p_fifo );
- EndThread( p_dec );
- return -1;
+ msg_Err(p_dec, "frame is too short");
+ block_Release( p_block );
+ return NULL;
}
-
- /* FIXME : I suppose the number of channel and sampling rate
- * are somewhere in the headers */
- p_dec->output_format.i_format = VLC_FOURCC('s','1','6','b');
- p_dec->output_format.i_physical_channels
- = p_dec->output_format.i_original_channels
- = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
- p_dec->output_format.i_rate = 48000;
-
- aout_DateInit( &p_dec->end_date, 48000 );
- p_dec->p_aout = NULL;
- p_dec->p_aout_input = aout_DecNew( p_dec->p_fifo,
- &p_dec->p_aout,
- &p_dec->output_format );
-
- if ( p_dec->p_aout_input == NULL )
+
+ i_header = p_block->p_buffer[4];
+ switch ( (i_header >> 4) & 0x3 )
{
- msg_Err( p_dec->p_fifo, "failed to create aout fifo" );
- p_dec->p_fifo->b_error = 1;
- EndThread( p_dec );
- return( -1 );
+ case 0:
+ i_rate = 48000;
+ break;
+ case 1:
+ i_rate = 96000;
+ break;
+ case 2:
+ i_rate = 44100;
+ break;
+ case 3:
+ i_rate = 32000;
+ break;
}
- /* lpcm decoder thread's main loop */
- while ( (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error) )
+ i_channels = (i_header & 0x7);
+ switch ( i_channels )
{
- DecodeFrame(p_dec);
+ case 0:
+ i_original_channels = AOUT_CHAN_CENTER;
+ break;
+ case 1:
+ i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
+ break;
+ case 2:
+ /* This is unsure. */
+ i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE;
+ break;
+ case 3:
+ i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
+ break;
+ case 4:
+ /* This is unsure. */
+ i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
+ | AOUT_CHAN_LFE;
+ break;
+ case 5:
+ i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
+ | AOUT_CHAN_CENTER | AOUT_CHAN_LFE;
+ break;
+ case 6:
+ i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
+ | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
+ | AOUT_CHAN_MIDDLERIGHT;
+ break;
+ case 7:
+ i_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
+ | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
+ | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE;
+ break;
}
- /* If b_error is set, the lpcm decoder thread enters the error loop */
- if ( p_dec->p_fifo->b_error )
+ switch ( (i_header >> 6) & 0x3 )
{
- DecoderError( p_dec->p_fifo );
+ case 2:
+ p_dec->fmt_out.i_codec = VLC_FOURCC('s','2','4','b');
+ p_dec->fmt_out.audio.i_bitspersample = 24;
+ i_bitspersample = 24;
+ break;
+ case 1:
+ p_dec->fmt_out.i_codec = VLC_FOURCC('s','2','4','b');
+ p_dec->fmt_out.audio.i_bitspersample = 24;
+ i_bitspersample = 20;
+ break;
+ case 0:
+ default:
+ p_dec->fmt_out.i_codec = VLC_FOURCC('s','1','6','b');
+ p_dec->fmt_out.audio.i_bitspersample = 16;
+ i_bitspersample = 16;
+ break;
}
- /* End of the lpcm decoder thread */
- EndThread( p_dec );
+ /* Check frame sync and drop it. */
+ if( p_block->p_buffer[5] != 0x80 )
+ {
+ msg_Warn( p_dec, "no frame sync" );
+ block_Release( p_block );
+ return NULL;
+ }
- return 0;
-}
+ /* Set output properties */
+ if( p_dec->fmt_out.audio.i_rate != i_rate )
+ {
+ aout_DateInit( &p_sys->end_date, i_rate );
+ aout_DateSet( &p_sys->end_date, p_block->i_pts );
+ }
+ p_dec->fmt_out.audio.i_rate = i_rate;
+ p_dec->fmt_out.audio.i_channels = i_channels + 1;
+ p_dec->fmt_out.audio.i_original_channels = i_original_channels;
+ p_dec->fmt_out.audio.i_physical_channels
+ = i_original_channels & AOUT_CHAN_PHYSMASK;
-/*****************************************************************************
- * DecodeFrame: decodes a frame.
- *****************************************************************************/
-void DecodeFrame( dec_thread_t * p_dec )
-{
- aout_buffer_t * p_aout_buffer;
- mtime_t i_pts;
+ i_frame_length = (p_block->i_buffer - LPCM_HEADER_LEN) /
+ p_dec->fmt_out.audio.i_channels * 8 / i_bitspersample;
- NextPTS( &p_dec->bit_stream, &i_pts, NULL );
-
- if( i_pts != 0 && i_pts != aout_DateGet( &p_dec->end_date ) )
+ if( p_sys->b_packetizer )
{
- aout_DateSet( &p_dec->end_date, i_pts );
+ p_dec->fmt_out.i_codec = VLC_FOURCC('l','p','c','m');
+ p_block->i_pts = p_block->i_dts = aout_DateGet( &p_sys->end_date );
+ p_block->i_length =
+ aout_DateIncrement( &p_sys->end_date, i_frame_length ) -
+ p_block->i_pts;
+
+ /* Just pass on the incoming frame */
+ return p_block;
}
-
- p_aout_buffer = aout_DecNewBuffer( p_dec->p_aout,
- p_dec->p_aout_input,
- LPCM_FRAME_NB );
-
- if( !p_aout_buffer )
+ else
{
- msg_Err( p_dec->p_fifo, "cannot get aout buffer" );
- p_dec->p_fifo->b_error = 1;
- return;
- }
-
- p_aout_buffer->start_date = aout_DateGet( &p_dec->end_date );
- p_aout_buffer->end_date = aout_DateIncrement( &p_dec->end_date,
- LPCM_FRAME_NB );
+ aout_buffer_t *p_aout_buffer;
+ p_aout_buffer = p_dec->pf_aout_buffer_new( p_dec, i_frame_length );
+ if( p_aout_buffer == NULL ) return NULL;
- /* Look for sync word - should be 0x0180 */
- RealignBits( &p_dec->bit_stream );
- while ( (GetBits( &p_dec->bit_stream, 16 ) ) != 0x0180 &&
- (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error));
+ p_aout_buffer->start_date = aout_DateGet( &p_sys->end_date );
+ p_aout_buffer->end_date =
+ aout_DateIncrement( &p_sys->end_date, i_frame_length );
- GetChunk( &p_dec->bit_stream, p_aout_buffer->p_buffer,
- LPCM_FRAME_NB * 4);
+ p_block->p_buffer += LPCM_HEADER_LEN;
+ p_block->i_buffer -= LPCM_HEADER_LEN;
- if( p_dec->p_fifo->b_die )
- {
- aout_DecDeleteBuffer( p_dec->p_aout, p_dec->p_aout_input,
- p_aout_buffer );
- return;
- }
+ /* 20/24 bits LPCM use special packing */
+ if( i_bitspersample == 24 )
+ {
+ uint8_t *p_out = p_aout_buffer->p_buffer;
+
+ while( p_block->i_buffer / 12 )
+ {
+ /* Sample 1 */
+ p_out[0] = p_block->p_buffer[0];
+ p_out[1] = p_block->p_buffer[1];
+ p_out[2] = p_block->p_buffer[8];
+ /* Sample 2 */
+ p_out[3] = p_block->p_buffer[2];
+ p_out[4] = p_block->p_buffer[3];
+ p_out[5] = p_block->p_buffer[9];
+ /* Sample 3 */
+ p_out[6] = p_block->p_buffer[4];
+ p_out[7] = p_block->p_buffer[5];
+ p_out[8] = p_block->p_buffer[10];
+ /* Sample 4 */
+ p_out[9] = p_block->p_buffer[6];
+ p_out[10] = p_block->p_buffer[7];
+ p_out[11] = p_block->p_buffer[11];
- aout_DecPlay( p_dec->p_aout, p_dec->p_aout_input,
- p_aout_buffer );
+ p_block->i_buffer -= 12;
+ p_block->p_buffer += 12;
+ p_out += 12;
+ }
+ }
+ else if( i_bitspersample == 20 )
+ {
+ uint8_t *p_out = p_aout_buffer->p_buffer;
+
+ while( p_block->i_buffer / 10 )
+ {
+ /* Sample 1 */
+ p_out[0] = p_block->p_buffer[0];
+ p_out[1] = p_block->p_buffer[1];
+ p_out[2] = p_block->p_buffer[8] & 0xF0;
+ /* Sample 2 */
+ p_out[3] = p_block->p_buffer[2];
+ p_out[4] = p_block->p_buffer[3];
+ p_out[5] = p_block->p_buffer[8] << 4;
+ /* Sample 3 */
+ p_out[6] = p_block->p_buffer[4];
+ p_out[7] = p_block->p_buffer[5];
+ p_out[8] = p_block->p_buffer[9] & 0xF0;
+ /* Sample 4 */
+ p_out[9] = p_block->p_buffer[6];
+ p_out[10] = p_block->p_buffer[7];
+ p_out[11] = p_block->p_buffer[9] << 4;
+
+ p_block->i_buffer -= 10;
+ p_block->p_buffer += 10;
+ p_out += 12;
+ }
+ }
+ else
+ {
+ memcpy( p_aout_buffer->p_buffer,
+ p_block->p_buffer, p_block->i_buffer );
+ }
+
+ block_Release( p_block );
+ return p_aout_buffer;
+ }
}
/*****************************************************************************
- * EndThread : lpcm decoder thread destruction
+ * CloseDecoder : lpcm decoder destruction
*****************************************************************************/
-static void EndThread( dec_thread_t * p_dec )
+static void CloseDecoder( vlc_object_t *p_this )
{
- if( p_dec->p_aout_input != NULL )
- {
- aout_DecDelete( p_dec->p_aout, p_dec->p_aout_input );
- }
-
- CloseBitstream( &p_dec->bit_stream );
- free( p_dec );
+ decoder_t *p_dec = (decoder_t*)p_this;
+ free( p_dec->p_sys );
}
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