/***************************************************************************** * dts.c : raw DTS stream input module for vlc ***************************************************************************** * Copyright (C) 2001-2007 the VideoLAN team * $Id: dc48f719a2b8ec7a766a9d372d91d8a67e98e1f0 $ * * Authors: 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_demux.h>#include <vlc_codec.h>/***************************************************************************** * Module descriptor *****************************************************************************/static int  Open  ( vlc_object_t * );static void Close ( vlc_object_t * );vlc_module_begin();    set_category( CAT_INPUT );    set_subcategory( SUBCAT_INPUT_DEMUX );    set_description( N_("Raw DTS demuxer") );    set_capability( "demux", 155 );    set_callbacks( Open, Close );    add_shortcut( "dts" );vlc_module_end();/***************************************************************************** * Local prototypes *****************************************************************************/static int Demux  ( demux_t * );static int Control( demux_t *, int, va_list );struct demux_sys_t{    bool  b_start;    es_out_id_t *p_es;    /* Packetizer */    decoder_t *p_packetizer;    mtime_t i_pts;    mtime_t i_time_offset;    int i_mux_rate;};static int CheckSync( const uint8_t *p_peek );#define DTS_PACKET_SIZE 16384#define DTS_PROBE_SIZE (DTS_PACKET_SIZE * 4)#define DTS_MAX_HEADER_SIZE 11/***************************************************************************** * Open: initializes ES structures *****************************************************************************/static int Open( vlc_object_t * p_this ){    demux_t     *p_demux = (demux_t*)p_this;    demux_sys_t *p_sys;    const uint8_t *p_peek;    int          i_peek = 0;    /* Check if we are dealing with a WAV file */    if( stream_Peek( p_demux->s, &p_peek, 20 ) == 20 &&        !memcmp( p_peek, "RIFF", 4 ) && !memcmp( &p_peek[8], "WAVE", 4 ) )    {        /* Find the wave format header */        i_peek = 12 + 8;        while( memcmp( p_peek + i_peek - 8, "fmt ", 4 ) )        {            uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );            if( i_len > DTS_PROBE_SIZE || i_peek + i_len > DTS_PROBE_SIZE )                return VLC_EGENERIC;            i_peek += i_len + 8;            if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )                return VLC_EGENERIC;        }        /* Sanity check the wave format header */        uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );        if( i_len > DTS_PROBE_SIZE )            return VLC_EGENERIC;        i_peek += i_len + 8;        if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )            return VLC_EGENERIC;        if( GetWLE( p_peek + i_peek - i_len - 8 /* wFormatTag */ ) !=            1 /* WAVE_FORMAT_PCM */ )            return VLC_EGENERIC;        if( GetWLE( p_peek + i_peek - i_len - 6 /* nChannels */ ) != 2 )            return VLC_EGENERIC;        if( GetDWLE( p_peek + i_peek - i_len - 4 /* nSamplesPerSec */ ) !=            44100 )            return VLC_EGENERIC;        /* Skip the wave header */        while( memcmp( p_peek + i_peek - 8, "data", 4 ) )        {            uint32_t i_len = GetDWLE( p_peek + i_peek - 4 );            if( i_len > DTS_PROBE_SIZE || i_peek + i_len > DTS_PROBE_SIZE )                return VLC_EGENERIC;            i_peek += i_len + 8;            if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )                return VLC_EGENERIC;        }        /* Some DTS wav files don't begin with a sync code so we do a more         * extensive search */        int i_size = stream_Peek( p_demux->s, &p_peek, DTS_PROBE_SIZE );        i_size -= DTS_MAX_HEADER_SIZE;        while( i_peek < i_size )        {            if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS )                /* The data is stored in 16 bits words */                i_peek += 2;            else                break;        }    }    /* Have a peep at the show. */    CHECK_PEEK( p_peek, i_peek + DTS_MAX_HEADER_SIZE * 2  );    if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS )    {        if( !p_demux->b_force )            return VLC_EGENERIC;        /* User forced */        msg_Err( p_demux, "this doesn't look like a DTS audio stream, "                 "continuing anyway" );    }    DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;    p_sys->b_start = true;    p_sys->i_mux_rate = 0;    p_sys->i_pts = 0;    p_sys->i_time_offset = 0;     INIT_APACKETIZER( p_sys->p_packetizer, 'd','t','s',' ' );    LOAD_PACKETIZER_OR_FAIL( p_sys->p_packetizer, "DTS" );    p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_in );    return VLC_SUCCESS;}/***************************************************************************** * Close: frees unused data *****************************************************************************/static void Close( vlc_object_t *p_this ){    demux_t     *p_demux = (demux_t*)p_this;    demux_sys_t *p_sys = p_demux->p_sys;    DESTROY_PACKETIZER( p_sys->p_packetizer );    free( p_sys );}/***************************************************************************** * Demux: reads and demuxes data packets ***************************************************************************** * Returns -1 in case of error, 0 in case of EOF, 1 otherwise *****************************************************************************/static int Demux( demux_t *p_demux ){    demux_sys_t *p_sys = p_demux->p_sys;    block_t *p_block_in, *p_block_out;    if( !( p_block_in = stream_Block( p_demux->s, DTS_PACKET_SIZE ) ) )    {        return 0;    }    if( p_sys->b_start )        p_block_in->i_pts = p_block_in->i_dts = 1;    else        p_block_in->i_pts = p_block_in->i_dts = 0;    while( (p_block_out = p_sys->p_packetizer->pf_packetize(                p_sys->p_packetizer, &p_block_in )) )    {        p_sys->b_start = false;        while( p_block_out )        {            block_t *p_next = p_block_out->p_next;            /* We assume a constant bitrate */            if( p_block_out->i_length )            {                p_sys->i_mux_rate =                    p_block_out->i_buffer * INT64_C(1000000) / p_block_out->i_length;            }            /* Correct timestamp */            p_block_out->i_pts += p_sys->i_time_offset;            p_block_out->i_dts += p_sys->i_time_offset;            /* set PCR */            es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );            es_out_Send( p_demux->out, p_sys->p_es, p_block_out );            p_block_out = p_next;        }    }    return 1;}/***************************************************************************** * Control: *****************************************************************************/static int Control( demux_t *p_demux, int i_query, va_list args ){    demux_sys_t *p_sys  = p_demux->p_sys;    bool *pb_bool;    int64_t *pi64;    int i_ret;    switch( i_query )    {    case DEMUX_HAS_UNSUPPORTED_META:        pb_bool = (bool*)va_arg( args, bool* );        *pb_bool = true;        return VLC_SUCCESS;    case DEMUX_GET_TIME:        pi64 = (int64_t*)va_arg( args, int64_t * );        *pi64 = p_sys->i_pts + p_sys->i_time_offset;        return VLC_SUCCESS;    case DEMUX_SET_TIME: /* TODO implement a high precicsion seek */    default:        i_ret = demux_vaControlHelper( p_demux->s,                                       0, -1,                                       8*p_sys->i_mux_rate, 1, i_query, args );        if( !i_ret && p_sys->i_mux_rate > 0 &&            ( i_query == DEMUX_SET_POSITION || i_query == DEMUX_SET_TIME ) )        {            const int64_t i_time = INT64_C(1000000) * stream_Tell(p_demux->s) /                                        p_sys->i_mux_rate;            /* Fix time_offset */            if( i_time >= 0 )                p_sys->i_time_offset = i_time - p_sys->i_pts;        }        return i_ret;    }}/***************************************************************************** * CheckSync: Check if buffer starts with a DTS sync code *****************************************************************************/static int CheckSync( const uint8_t *p_peek ){    /* 14 bits, little endian version of the bitstream */    if( p_peek[0] == 0xff && p_peek[1] == 0x1f &&        p_peek[2] == 0x00 && p_peek[3] == 0xe8 &&        (p_peek[4] & 0xf0) == 0xf0 && p_peek[5] == 0x07 )    {        return VLC_SUCCESS;    }    /* 14 bits, big endian version of the bitstream */    else if( p_peek[0] == 0x1f && p_peek[1] == 0xff &&             p_peek[2] == 0xe8 && p_peek[3] == 0x00 &&             p_peek[4] == 0x07 && (p_peek[5] & 0xf0) == 0xf0)    {        return VLC_SUCCESS;    }    /* 16 bits, big endian version of the bitstream */    else if( p_peek[0] == 0x7f && p_peek[1] == 0xfe &&             p_peek[2] == 0x80 && p_peek[3] == 0x01 )    {        return VLC_SUCCESS;    }    /* 16 bits, little endian version of the bitstream */    else if( p_peek[0] == 0xfe && p_peek[1] == 0x7f &&             p_peek[2] == 0x01 && p_peek[3] == 0x80 )    {        return VLC_SUCCESS;    }    return VLC_EGENERIC;}