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372 lines
12 KiB
372 lines
12 KiB
/*****************************************************************************
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* mpegaudio.c
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*****************************************************************************
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* Copyright (C) 2001, 2002 VideoLAN
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* $Id: mpegaudio.c,v 1.2 2002/12/18 01:34:44 fenrir Exp $
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*
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* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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* Eric Petit <titer@videolan.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <vlc/vlc.h>
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#include <vlc/aout.h>
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#include <vlc/decoder.h>
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#include <vlc/input.h>
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#include <vlc/sout.h>
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#include <stdlib.h> /* malloc(), free() */
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#include <string.h> /* strdup() */
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#include "codecs.h" /* WAVEFORMATEX BITMAPINFOHEADER */
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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typedef struct packetizer_s
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{
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/* Input properties */
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decoder_fifo_t *p_fifo;
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bit_stream_t bit_stream;
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/* Output properties */
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sout_input_t *p_sout_input;
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sout_packet_format_t output_format;
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uint64_t i_samplescount;
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uint32_t i_samplespersecond;
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} packetizer_t;
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static int Open ( vlc_object_t * );
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static int Run ( decoder_fifo_t * );
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static int InitThread ( packetizer_t * );
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static void PacketizeThread ( packetizer_t * );
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static void EndThread ( packetizer_t * );
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#define FREE( p ) if( p ) free( p ); p = NULL
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin();
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set_description( _("MPEG-I/II audio packetizer") );
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set_capability( "packetizer", 50 );
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set_callbacks( Open, NULL );
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vlc_module_end();
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static int mpegaudio_bitrate[2][3][16] =
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{
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{
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/* v1 l1 */
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{ 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0},
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/* v1 l2 */
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0},
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/* v1 l3 */
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{ 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0}
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},
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{
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/* v2 l1 */
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0},
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/* v2 l2 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0},
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/* v2 l3 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0}
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}
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};
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static int mpegaudio_samplerate[2][4] = /* version 1 then 2 */
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{
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{ 44100, 48000, 32000, 0 },
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{ 22050, 24000, 16000, 0 }
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};
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/*****************************************************************************
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* OpenDecoder: probe the packetizer and return score
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*****************************************************************************
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* Tries to launch a decoder and return score so that the interface is able
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* to choose.
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*****************************************************************************/
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static int Open( vlc_object_t *p_this )
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{
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decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
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if( p_fifo->i_fourcc != VLC_FOURCC( 'm', 'p', 'g', 'a') )
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{
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return VLC_EGENERIC;
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}
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p_fifo->pf_run = Run;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* RunDecoder: this function is called just after the thread is created
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*****************************************************************************/
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static int Run( decoder_fifo_t *p_fifo )
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{
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packetizer_t *p_pack;
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int b_error;
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msg_Info( p_fifo, "Running mpegaudio packetizer" );
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if( !( p_pack = malloc( sizeof( packetizer_t ) ) ) )
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{
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msg_Err( p_fifo, "out of memory" );
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DecoderError( p_fifo );
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return( -1 );
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}
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memset( p_pack, 0, sizeof( packetizer_t ) );
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p_pack->p_fifo = p_fifo;
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if( InitThread( p_pack ) != 0 )
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{
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DecoderError( p_fifo );
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return( -1 );
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}
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while( ( !p_pack->p_fifo->b_die )&&( !p_pack->p_fifo->b_error ) )
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{
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PacketizeThread( p_pack );
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}
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if( ( b_error = p_pack->p_fifo->b_error ) )
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{
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DecoderError( p_pack->p_fifo );
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}
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EndThread( p_pack );
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FREE( p_pack );
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if( b_error )
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{
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return( -1 );
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}
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return( 0 );
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}
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/*****************************************************************************
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* InitThread: initialize data before entering main loop
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*****************************************************************************/
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static int InitThread( packetizer_t *p_pack )
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{
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p_pack->output_format.i_cat = AUDIO_ES;
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p_pack->output_format.i_fourcc = p_pack->p_fifo->i_fourcc;
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p_pack->output_format.p_format = NULL;
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p_pack->p_sout_input = NULL;
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p_pack->i_samplescount = 0;
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p_pack->i_samplespersecond = 0;
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if( InitBitstream( &p_pack->bit_stream, p_pack->p_fifo,
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NULL, NULL ) != VLC_SUCCESS )
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{
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msg_Err( p_pack->p_fifo, "cannot initialize bitstream" );
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return -1;
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}
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return( 0 );
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}
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/*****************************************************************************
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* PacketizeThread: packetize an unit (here copy a complete pes)
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*****************************************************************************/
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static void PacketizeThread( packetizer_t *p_pack )
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{
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sout_buffer_t *p_sout_buffer;
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size_t i_size;
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uint32_t i_sync, i_header;
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int i_version, i_layer;
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int i_channels, i_samplerate, i_bitrate;
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int i_samplesperframe, i_framelength;
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int i_skip = 0;
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/* search a valid start code */
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for( ;; )
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{
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int i_crc, i_bitrate_index, i_samplerate_index;
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int i_padding, i_extention, i_mode, i_modeext, i_copyright;
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int i_original, i_emphasis;
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RealignBits( &p_pack->bit_stream );
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while( ShowBits( &p_pack->bit_stream, 12 ) != 0x0fff &&
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!p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error )
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{
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//msg_Warn( p_pack->p_fifo, "trash..." );
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RemoveBits( &p_pack->bit_stream, 8 );
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i_skip++;
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}
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if( p_pack->p_fifo->b_die || p_pack->p_fifo->b_error )
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{
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return;
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}
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i_sync = GetBits( &p_pack->bit_stream, 12 );
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i_header = ShowBits( &p_pack->bit_stream, 20 );
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i_version = 1 - GetBits( &p_pack->bit_stream, 1 );
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i_layer = 3 - GetBits( &p_pack->bit_stream, 2 );
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i_crc = 1 - GetBits( &p_pack->bit_stream, 1 );
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i_bitrate_index = GetBits( &p_pack->bit_stream, 4 );
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i_samplerate_index = GetBits( &p_pack->bit_stream, 2 );
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i_padding = GetBits( &p_pack->bit_stream, 1 );
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i_extention = GetBits( &p_pack->bit_stream, 1 );
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i_mode = GetBits( &p_pack->bit_stream, 2 );
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i_modeext = GetBits( &p_pack->bit_stream, 2 );
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i_copyright = GetBits( &p_pack->bit_stream, 1 );
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i_original = GetBits( &p_pack->bit_stream, 1 );
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i_emphasis = GetBits( &p_pack->bit_stream, 2 );
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if( i_layer != 3 &&
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i_bitrate_index > 0x00 && i_bitrate_index < 0x0f &&
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i_samplerate_index != 0x03 &&
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i_emphasis != 0x02 )
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{
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i_channels = ( i_mode == 3 ) ? 1 : 2;
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i_bitrate = mpegaudio_bitrate[i_version][i_layer][i_bitrate_index];
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i_samplerate = mpegaudio_samplerate[i_version][i_samplerate_index];
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switch( i_layer )
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{
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case 0:
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i_framelength = ( ( i_version ? 6000 : 12000 ) *
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i_bitrate / i_samplerate + i_padding ) * 4;
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break;
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case 1:
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case 2:
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i_framelength = ( i_version ? 72000 : 144000 ) *
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i_bitrate / i_samplerate + i_padding;
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break;
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default:
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i_framelength = 0;
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}
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switch( i_layer )
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{
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case 0:
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i_samplesperframe = 384;
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break;
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case 1:
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i_samplesperframe = 1152;
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break;
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case 2:
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i_samplesperframe = i_version ? 576 : 1152;
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break;
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default:
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i_samplesperframe = 0;
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}
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break;
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}
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}
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if( !p_pack->p_sout_input )
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{
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/* add a input for the stream ouput */
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WAVEFORMATEX *p_wf;
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p_wf = malloc( sizeof( WAVEFORMATEX ) );
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p_pack->output_format.p_format = (void*)p_wf;
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p_wf->wFormatTag = WAVE_FORMAT_MPEG;
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p_wf->nChannels = i_channels;
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p_wf->nSamplesPerSec = i_samplerate;
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p_wf->nAvgBytesPerSec = 0;
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p_wf->nBlockAlign = 1;
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p_wf->wBitsPerSample = 0;
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p_wf->cbSize = 0; // FIXME there are more field for mpegaudio
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p_pack->p_sout_input =
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sout_InputNew( p_pack->p_fifo,
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&p_pack->output_format );
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if( !p_pack->p_sout_input )
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{
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msg_Err( p_pack->p_fifo,
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"cannot add a new stream" );
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p_pack->p_fifo->b_error = 1;
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return;
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}
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msg_Dbg( p_pack->p_fifo,
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"v:%d l:%d channels:%d samplerate:%d bitrate:%d size:%d",
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i_version, i_layer, i_channels, i_samplerate,
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i_bitrate, i_framelength );
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}
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i_size = __MAX( i_framelength, 4 );
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// msg_Dbg( p_pack->p_fifo, "frame length %d b", i_size );
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p_sout_buffer =
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sout_BufferNew( p_pack->p_sout_input->p_sout, i_size );
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if( !p_sout_buffer )
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{
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p_pack->p_fifo->b_error = 1;
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return;
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}
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p_sout_buffer->p_buffer[0] = ( i_sync >> 4 )&0xff;
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p_sout_buffer->p_buffer[1] =
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( ( i_sync << 4 )&0xf0 ) | ( ( i_header >> 16 )&0x0f );
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p_sout_buffer->p_buffer[2] = ( i_header >> 8 )&0xff;
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p_sout_buffer->p_buffer[3] = ( i_header )&0xff;
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p_sout_buffer->i_bitrate = i_bitrate;
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p_sout_buffer->i_pts =
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p_sout_buffer->i_dts =
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(uint64_t)1000000 *
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(uint64_t)p_pack->i_samplescount /
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(uint64_t)i_samplerate;
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p_sout_buffer->i_length =
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(uint64_t)1000000 *
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(uint64_t)i_samplesperframe /
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(uint64_t)i_samplerate;
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p_pack->i_samplescount += i_samplesperframe;
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/* we are already aligned */
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GetChunk( &p_pack->bit_stream,
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p_sout_buffer->p_buffer + 4,
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i_size - 4 );
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sout_InputSendBuffer( p_pack->p_sout_input,
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p_sout_buffer );
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}
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/*****************************************************************************
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* EndThread : packetizer thread destruction
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*****************************************************************************/
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static void EndThread ( packetizer_t *p_pack)
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{
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if( p_pack->p_sout_input )
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{
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sout_InputDelete( p_pack->p_sout_input );
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}
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}
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