dts.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:25k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * dts.c: parse DTS audio sync info and packetize the stream
- *****************************************************************************
- * Copyright (C) 2003-2009 the VideoLAN team
- * $Id: 9b4ac47f8d2a92ecf1fe9c414570e584a99bfa5a $
- *
- * Authors: Jon Lech Johansen <jon-vl@nanocrew.net>
- * Gildas Bazin <gbazin@netcourrier.com>
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_plugin.h>
- #include <vlc_codec.h>
- #include <vlc_aout.h>
- #include <vlc_block_helper.h>
- #include <vlc_bits.h>
- /*****************************************************************************
- * 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_("DTS parser") )
- set_capability( "decoder", 100 )
- set_callbacks( OpenDecoder, CloseCommon )
- add_submodule ()
- set_description( N_("DTS audio packetizer") )
- set_capability( "packetizer", 10 )
- set_callbacks( OpenPacketizer, CloseCommon )
- vlc_module_end ()
- /*****************************************************************************
- * decoder_sys_t : decoder descriptor
- *****************************************************************************/
- struct decoder_sys_t
- {
- /* Module mode */
- bool b_packetizer;
- /*
- * Input properties
- */
- int i_state;
- block_bytestream_t bytestream;
- /*
- * Common properties
- */
- audio_date_t end_date;
- mtime_t i_pts;
- bool b_dts_hd; /* Is the current frame a DTS HD one */
- unsigned int i_bit_rate;
- unsigned int i_frame_size;
- unsigned int i_frame_length;
- unsigned int i_rate;
- unsigned int i_channels;
- unsigned int i_channels_conf;
- };
- enum {
- STATE_NOSYNC,
- STATE_SYNC,
- STATE_HEADER,
- STATE_NEXT_SYNC,
- STATE_GET_DATA,
- STATE_SEND_DATA
- };
- #define DTS_HEADER_SIZE 14
- /****************************************************************************
- * Local prototypes
- ****************************************************************************/
- static int OpenCommon( vlc_object_t *, bool b_packetizer );
- static void *DecodeBlock( decoder_t *, block_t ** );
- static inline int SyncCode( const uint8_t * );
- static int SyncInfo( const uint8_t *, bool *, unsigned int *, unsigned int *,
- unsigned int *, unsigned int *, unsigned int * );
- static uint8_t *GetOutBuffer ( decoder_t *, void ** );
- static aout_buffer_t *GetAoutBuffer( decoder_t * );
- static block_t *GetSoutBuffer( decoder_t * );
- /*****************************************************************************
- * OpenDecoder: probe the decoder
- *****************************************************************************/
- static int OpenDecoder( vlc_object_t *p_this )
- {
- /* HACK: Don't use this codec if we don't have an dts audio filter */
- if( !module_exists( "dtstofloat32" ) )
- return VLC_EGENERIC;
- return OpenCommon( p_this, false );
- }
- /*****************************************************************************
- * OpenPacketizer: probe the packetizer
- *****************************************************************************/
- static int OpenPacketizer( vlc_object_t *p_this )
- {
- return OpenCommon( p_this, true );
- }
- /*****************************************************************************
- * OpenCommon:
- *****************************************************************************/
- static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
- {
- decoder_t *p_dec = (decoder_t*)p_this;
- decoder_sys_t *p_sys;
- if( p_dec->fmt_in.i_codec != VLC_FOURCC('d','t','s',' ') &&
- p_dec->fmt_in.i_codec != VLC_FOURCC('d','t','s','b') )
- {
- return VLC_EGENERIC;
- }
- /* Allocate the memory needed to store the decoder's structure */
- if( ( p_dec->p_sys = p_sys = malloc(sizeof(*p_sys)) ) == NULL )
- return VLC_ENOMEM;
- /* Misc init */
- p_sys->b_packetizer = b_packetizer;
- p_sys->i_state = STATE_NOSYNC;
- aout_DateSet( &p_sys->end_date, 0 );
- p_sys->b_dts_hd = false;
- p_sys->bytestream = block_BytestreamInit();
- /* Set output properties */
- p_dec->fmt_out.i_cat = AUDIO_ES;
- p_dec->fmt_out.i_codec = VLC_FOURCC('d','t','s',' ');
- p_dec->fmt_out.audio.i_rate = 0; /* So end_date gets initialized */
- /* Set callback */
- p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
- DecodeBlock;
- p_dec->pf_packetize = (block_t *(*)(decoder_t *, block_t **))
- DecodeBlock;
- return VLC_SUCCESS;
- }
- /****************************************************************************
- * DecodeBlock: the whole thing
- ****************************************************************************/
- static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- uint8_t p_header[DTS_HEADER_SIZE];
- uint8_t *p_buf;
- void *p_out_buffer;
- if( !pp_block || !*pp_block )
- return NULL;
- if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
- {
- if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
- {
- p_sys->i_state = STATE_NOSYNC;
- block_BytestreamEmpty( &p_sys->bytestream );
- }
- aout_DateSet( &p_sys->end_date, 0 );
- block_Release( *pp_block );
- return NULL;
- }
- if( !aout_DateGet( &p_sys->end_date ) && !(*pp_block)->i_pts )
- {
- /* We've just started the stream, wait for the first PTS. */
- block_Release( *pp_block );
- return NULL;
- }
- block_BytestreamPush( &p_sys->bytestream, *pp_block );
- while( 1 )
- {
- switch( p_sys->i_state )
- {
- case STATE_NOSYNC:
- /* Look for sync code - should be 0x7ffe8001 */
- while( block_PeekBytes( &p_sys->bytestream, p_header, 6 )
- == VLC_SUCCESS )
- {
- if( SyncCode( p_header ) == VLC_SUCCESS )
- {
- p_sys->i_state = STATE_SYNC;
- break;
- }
- block_SkipByte( &p_sys->bytestream );
- }
- if( p_sys->i_state != STATE_SYNC )
- {
- block_BytestreamFlush( &p_sys->bytestream );
- /* Need more data */
- return NULL;
- }
- 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 != 0 &&
- p_sys->i_pts != aout_DateGet( &p_sys->end_date ) )
- {
- aout_DateSet( &p_sys->end_date, p_sys->i_pts );
- }
- p_sys->i_state = STATE_HEADER;
- case STATE_HEADER:
- /* Get DTS frame header (DTS_HEADER_SIZE bytes) */
- if( block_PeekBytes( &p_sys->bytestream, p_header,
- DTS_HEADER_SIZE ) != VLC_SUCCESS )
- {
- /* Need more data */
- return NULL;
- }
- /* Check if frame is valid and get frame info */
- p_sys->i_frame_size = SyncInfo( p_header,
- &p_sys->b_dts_hd,
- &p_sys->i_channels,
- &p_sys->i_channels_conf,
- &p_sys->i_rate,
- &p_sys->i_bit_rate,
- &p_sys->i_frame_length );
- if( !p_sys->i_frame_size )
- {
- msg_Dbg( p_dec, "emulated sync word" );
- block_SkipByte( &p_sys->bytestream );
- p_sys->i_state = STATE_NOSYNC;
- break;
- }
- p_sys->i_state = STATE_NEXT_SYNC;
- 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->i_frame_size, p_header, 6 )
- != VLC_SUCCESS )
- {
- /* Need more data */
- return NULL;
- }
- if( SyncCode( p_header ) != VLC_SUCCESS )
- {
- msg_Dbg( p_dec, "emulated sync word "
- "(no sync on following frame): %2.2x%2.2x%2.2x%2.2x",
- (int)p_header[0], (int)p_header[1],
- (int)p_header[2], (int)p_header[3] );
- p_sys->i_state = STATE_NOSYNC;
- block_SkipByte( &p_sys->bytestream );
- break;
- }
- p_sys->i_state = STATE_SEND_DATA;
- break;
- 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->i_frame_size ) != VLC_SUCCESS )
- {
- /* Need more data */
- return NULL;
- }
- p_sys->i_state = STATE_SEND_DATA;
- case STATE_SEND_DATA:
- if( p_sys->b_dts_hd )
- {
- /* Ignore DTS-HD */
- block_SkipBytes( &p_sys->bytestream, p_sys->i_frame_size );
- p_sys->i_state = STATE_NOSYNC;
- break;
- }
- if( !(p_buf = GetOutBuffer( p_dec, &p_out_buffer )) )
- {
- //p_dec->b_error = true;
- return NULL;
- }
- /* 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, p_sys->i_frame_size );
- /* 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 = 0;
- p_sys->i_state = STATE_NOSYNC;
- /* So p_block doesn't get re-added several times */
- *pp_block = block_BytestreamPop( &p_sys->bytestream );
- return p_out_buffer;
- }
- }
- return NULL;
- }
- /*****************************************************************************
- * CloseCommon: clean up the decoder
- *****************************************************************************/
- static void CloseCommon( vlc_object_t *p_this )
- {
- decoder_t *p_dec = (decoder_t*)p_this;
- decoder_sys_t *p_sys = p_dec->p_sys;
- block_BytestreamRelease( &p_sys->bytestream );
- free( p_sys );
- }
- /*****************************************************************************
- * GetOutBuffer:
- *****************************************************************************/
- static uint8_t *GetOutBuffer( decoder_t *p_dec, void **pp_out_buffer )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- uint8_t *p_buf;
- if( p_dec->fmt_out.audio.i_rate != p_sys->i_rate )
- {
- msg_Info( p_dec, "DTS channels:%d samplerate:%d bitrate:%d",
- p_sys->i_channels, p_sys->i_rate, p_sys->i_bit_rate );
- aout_DateInit( &p_sys->end_date, p_sys->i_rate );
- aout_DateSet( &p_sys->end_date, p_sys->i_pts );
- }
- p_dec->fmt_out.audio.i_rate = p_sys->i_rate;
- p_dec->fmt_out.audio.i_channels = p_sys->i_channels;
- /* Hack for DTS S/PDIF filter which needs to pad the DTS frames */
- p_dec->fmt_out.audio.i_bytes_per_frame =
- __MAX( p_sys->i_frame_size, p_sys->i_frame_length * 4 );
- p_dec->fmt_out.audio.i_frame_length = p_sys->i_frame_length;
- p_dec->fmt_out.audio.i_original_channels = p_sys->i_channels_conf;
- p_dec->fmt_out.audio.i_physical_channels =
- p_sys->i_channels_conf & AOUT_CHAN_PHYSMASK;
- p_dec->fmt_out.i_bitrate = p_sys->i_bit_rate;
- if( p_sys->b_packetizer )
- {
- 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
- {
- 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;
- /* Hack for DTS S/PDIF filter which needs to send 3 frames at a time
- * (plus a few header bytes) */
- p_buf = decoder_NewAudioBuffer( p_dec, p_sys->i_frame_length * 4 );
- if( p_buf == NULL ) return NULL;
- p_buf->i_nb_samples = p_sys->i_frame_length;
- p_buf->i_nb_bytes = p_sys->i_frame_size;
- p_buf->start_date = aout_DateGet( &p_sys->end_date );
- p_buf->end_date =
- aout_DateIncrement( &p_sys->end_date, p_sys->i_frame_length );
- 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->i_frame_size );
- if( p_block == NULL ) return NULL;
- p_block->i_pts = p_block->i_dts = aout_DateGet( &p_sys->end_date );
- p_block->i_length = aout_DateIncrement( &p_sys->end_date,
- p_sys->i_frame_length ) - p_block->i_pts;
- return p_block;
- }
- /*****************************************************************************
- * SyncInfo: parse DTS sync info
- *****************************************************************************/
- static const unsigned int ppi_dts_samplerate[] =
- {
- 0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
- 12000, 24000, 48000, 96000, 192000
- };
- static const unsigned int ppi_dts_bitrate[] =
- {
- 32000, 56000, 64000, 96000, 112000, 128000,
- 192000, 224000, 256000, 320000, 384000,
- 448000, 512000, 576000, 640000, 768000,
- 896000, 1024000, 1152000, 1280000, 1344000,
- 1408000, 1411200, 1472000, 1536000, 1920000,
- 2048000, 3072000, 3840000, 1/*open*/, 2/*variable*/, 3/*lossless*/
- };
- static int SyncInfo16be( const uint8_t *p_buf,
- unsigned int *pi_audio_mode,
- unsigned int *pi_sample_rate,
- unsigned int *pi_bit_rate,
- unsigned int *pi_frame_length )
- {
- unsigned int i_frame_size;
- unsigned int i_lfe;
- *pi_frame_length = (p_buf[4] & 0x01) << 6 | (p_buf[5] >> 2);
- i_frame_size = (p_buf[5] & 0x03) << 12 | (p_buf[6] << 4) |
- (p_buf[7] >> 4);
- *pi_audio_mode = (p_buf[7] & 0x0f) << 2 | (p_buf[8] >> 6);
- *pi_sample_rate = (p_buf[8] >> 2) & 0x0f;
- *pi_bit_rate = (p_buf[8] & 0x03) << 3 | ((p_buf[9] >> 5) & 0x07);
- i_lfe = (p_buf[10] >> 1) & 0x03;
- if( i_lfe ) *pi_audio_mode |= 0x10000;
- return i_frame_size + 1;
- }
- static void BufLeToBe( uint8_t *p_out, const uint8_t *p_in, int i_in )
- {
- int i;
- for( i = 0; i < i_in/2; i++ )
- {
- p_out[i*2] = p_in[i*2+1];
- p_out[i*2+1] = p_in[i*2];
- }
- }
- static int Buf14To16( uint8_t *p_out, const uint8_t *p_in, int i_in, int i_le )
- {
- unsigned char tmp, cur = 0;
- int bits_in, bits_out = 0;
- int i, i_out = 0;
- for( i = 0; i < i_in; i++ )
- {
- if( i%2 )
- {
- tmp = p_in[i-i_le];
- bits_in = 8;
- }
- else
- {
- tmp = p_in[i+i_le] & 0x3F;
- bits_in = 8 - 2;
- }
- if( bits_out < 8 )
- {
- int need = __MIN( 8 - bits_out, bits_in );
- cur <<= need;
- cur |= ( tmp >> (bits_in - need) );
- tmp <<= (8 - bits_in + need);
- tmp >>= (8 - bits_in + need);
- bits_in -= need;
- bits_out += need;
- }
- if( bits_out == 8 )
- {
- p_out[i_out] = cur;
- cur = 0;
- bits_out = 0;
- i_out++;
- }
- bits_out += bits_in;
- cur <<= bits_in;
- cur |= tmp;
- }
- return i_out;
- }
- static inline int SyncCode( const uint8_t *p_buf )
- {
- /* 14 bits, little endian version of the bitstream */
- if( p_buf[0] == 0xff && p_buf[1] == 0x1f &&
- p_buf[2] == 0x00 && p_buf[3] == 0xe8 &&
- (p_buf[4] & 0xf0) == 0xf0 && p_buf[5] == 0x07 )
- {
- return VLC_SUCCESS;
- }
- /* 14 bits, big endian version of the bitstream */
- else if( p_buf[0] == 0x1f && p_buf[1] == 0xff &&
- p_buf[2] == 0xe8 && p_buf[3] == 0x00 &&
- p_buf[4] == 0x07 && (p_buf[5] & 0xf0) == 0xf0 )
- {
- return VLC_SUCCESS;
- }
- /* 16 bits, big endian version of the bitstream */
- else if( p_buf[0] == 0x7f && p_buf[1] == 0xfe &&
- p_buf[2] == 0x80 && p_buf[3] == 0x01 )
- {
- return VLC_SUCCESS;
- }
- /* 16 bits, little endian version of the bitstream */
- else if( p_buf[0] == 0xfe && p_buf[1] == 0x7f &&
- p_buf[2] == 0x01 && p_buf[3] == 0x80 )
- {
- return VLC_SUCCESS;
- }
- /* DTS-HD */
- else if( p_buf[0] == 0x64 && p_buf[1] == 0x58 &&
- p_buf[2] == 0x20 && p_buf[3] == 0x25 )
- {
- return VLC_SUCCESS;
- }
- return VLC_EGENERIC;
- }
- static int SyncInfo( const uint8_t *p_buf,
- bool *pb_dts_hd,
- unsigned int *pi_channels,
- unsigned int *pi_channels_conf,
- unsigned int *pi_sample_rate,
- unsigned int *pi_bit_rate,
- unsigned int *pi_frame_length )
- {
- unsigned int i_audio_mode;
- unsigned int i_frame_size;
- /* 14 bits, little endian version of the bitstream */
- if( p_buf[0] == 0xff && p_buf[1] == 0x1f &&
- p_buf[2] == 0x00 && p_buf[3] == 0xe8 &&
- (p_buf[4] & 0xf0) == 0xf0 && p_buf[5] == 0x07 )
- {
- uint8_t conv_buf[DTS_HEADER_SIZE];
- Buf14To16( conv_buf, p_buf, DTS_HEADER_SIZE, 1 );
- i_frame_size = SyncInfo16be( conv_buf, &i_audio_mode, pi_sample_rate,
- pi_bit_rate, pi_frame_length );
- i_frame_size = i_frame_size * 8 / 14 * 2;
- }
- /* 14 bits, big endian version of the bitstream */
- else if( p_buf[0] == 0x1f && p_buf[1] == 0xff &&
- p_buf[2] == 0xe8 && p_buf[3] == 0x00 &&
- p_buf[4] == 0x07 && (p_buf[5] & 0xf0) == 0xf0 )
- {
- uint8_t conv_buf[DTS_HEADER_SIZE];
- Buf14To16( conv_buf, p_buf, DTS_HEADER_SIZE, 0 );
- i_frame_size = SyncInfo16be( conv_buf, &i_audio_mode, pi_sample_rate,
- pi_bit_rate, pi_frame_length );
- i_frame_size = i_frame_size * 8 / 14 * 2;
- }
- /* 16 bits, big endian version of the bitstream */
- else if( p_buf[0] == 0x7f && p_buf[1] == 0xfe &&
- p_buf[2] == 0x80 && p_buf[3] == 0x01 )
- {
- i_frame_size = SyncInfo16be( p_buf, &i_audio_mode, pi_sample_rate,
- pi_bit_rate, pi_frame_length );
- }
- /* 16 bits, little endian version of the bitstream */
- else if( p_buf[0] == 0xfe && p_buf[1] == 0x7f &&
- p_buf[2] == 0x01 && p_buf[3] == 0x80 )
- {
- uint8_t conv_buf[DTS_HEADER_SIZE];
- BufLeToBe( conv_buf, p_buf, DTS_HEADER_SIZE );
- i_frame_size = SyncInfo16be( p_buf, &i_audio_mode, pi_sample_rate,
- pi_bit_rate, pi_frame_length );
- }
- /* DTS-HD */
- else if( p_buf[0] == 0x64 && p_buf[1] == 0x58 &&
- p_buf[2] == 0x20 && p_buf[3] == 0x25 )
- {
- int i_dts_hd_size;
- bs_t s;
- bs_init( &s, &p_buf[4], DTS_HEADER_SIZE - 4 );
- bs_skip( &s, 8 + 2 );
- if( bs_read1( &s ) )
- {
- bs_skip( &s, 12 );
- i_dts_hd_size = bs_read( &s, 20 ) + 1;
- }
- else
- {
- bs_skip( &s, 8 );
- i_dts_hd_size = bs_read( &s, 16 ) + 1;
- }
- //uint16_t s0 = bs_read( &s, 16 );
- //uint16_t s1 = bs_read( &s, 16 );
- //fprintf( stderr, "DTS HD=%d : %x %xn", i_dts_hd_size, s0, s1 );
- *pb_dts_hd = true;
- /* As we ignore the stream, do not modify those variables:
- *pi_channels = ;
- *pi_channels_conf = ;
- *pi_sample_rate = ;
- *pi_bit_rate = ;
- *pi_frame_length = ;
- */
- return i_dts_hd_size;
- }
- *pb_dts_hd = false;
- switch( i_audio_mode & 0xFFFF )
- {
- case 0x0:
- /* Mono */
- *pi_channels_conf = AOUT_CHAN_CENTER;
- break;
- case 0x1:
- /* Dual-mono = stereo + dual-mono */
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
- AOUT_CHAN_DUALMONO;
- break;
- case 0x2:
- case 0x3:
- case 0x4:
- /* Stereo */
- *pi_channels = 2;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
- break;
- case 0x5:
- /* 3F */
- *pi_channels = 3;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
- AOUT_CHAN_CENTER;
- break;
- case 0x6:
- /* 2F/1R */
- *pi_channels = 3;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
- AOUT_CHAN_REARCENTER;
- break;
- case 0x7:
- /* 3F/1R */
- *pi_channels = 4;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
- AOUT_CHAN_CENTER | AOUT_CHAN_REARCENTER;
- break;
- case 0x8:
- /* 2F2R */
- *pi_channels = 4;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
- AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
- break;
- case 0x9:
- /* 3F2R */
- *pi_channels = 5;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
- AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
- AOUT_CHAN_REARRIGHT;
- break;
- case 0xA:
- case 0xB:
- /* 2F2M2R */
- *pi_channels = 6;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
- AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
- AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
- break;
- case 0xC:
- /* 3F2M2R */
- *pi_channels = 7;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
- AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT |
- AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT |
- AOUT_CHAN_REARRIGHT;
- break;
- case 0xD:
- case 0xE:
- /* 3F2M2R/LFE */
- *pi_channels = 8;
- *pi_channels_conf = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
- AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT |
- AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT |
- AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
- break;
- default:
- if( i_audio_mode <= 63 )
- {
- /* User defined */
- *pi_channels = 0;
- *pi_channels_conf = 0;
- }
- else return 0;
- break;
- }
- if( i_audio_mode & 0x10000 )
- {
- (*pi_channels)++;
- *pi_channels_conf |= AOUT_CHAN_LFE;
- }
- if( *pi_sample_rate >= sizeof( ppi_dts_samplerate ) /
- sizeof( ppi_dts_samplerate[0] ) )
- {
- return 0;
- }
- *pi_sample_rate = ppi_dts_samplerate[ *pi_sample_rate ];
- if( !*pi_sample_rate ) return 0;
- if( *pi_bit_rate >= sizeof( ppi_dts_bitrate ) /
- sizeof( ppi_dts_bitrate[0] ) )
- {
- return 0;
- }
- *pi_bit_rate = ppi_dts_bitrate[ *pi_bit_rate ];
- if( !*pi_bit_rate ) return 0;
- *pi_frame_length = (*pi_frame_length + 1) * 32;
- return i_frame_size;
- }