/src/vlc/modules/packetizer/dts.c

Source
/*****************************************************************************
 * dts.c: parse DTS audio sync info and packetize the stream
 *****************************************************************************
 * Copyright (C) 2001-2016 VLC authors and VideoLAN
 *
 * Authors: Gildas Bazin <gbazin@videolan.org>
 *          Thomas Guillem <thomas@gllm.fr>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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 <stdbit.h>

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_codec.h>
#include <vlc_block_helper.h>
#include <vlc_modules.h>

#include "dts_header.h"

#include "packetizer_helper.h"

static int  Open( vlc_object_t * );
static void Close( vlc_object_t * );

vlc_module_begin ()
    set_subcategory( SUBCAT_SOUT_PACKETIZER )
    set_description( N_("DTS audio packetizer") )
    set_capability( "audio packetizer", 10 )
    set_callbacks( Open, Close )
vlc_module_end ()

typedef struct
{
    /*
     * Input properties
     */
    int i_state;

    block_bytestream_t bytestream;
    size_t i_next_offset;

    /*
     * Common properties
     */
    date_t  end_date;
    bool    b_date_set;

    vlc_tick_t i_pts;
    bool    b_discontinuity;

    vlc_dts_header_t first, second;
    size_t  i_input_size;
} decoder_sys_t;

enum
{
    STATE_SYNC_SUBSTREAM_EXTENSIONS = STATE_CUSTOM_FIRST,
    STATE_NEXT_SYNC_SUBSTREAM_EXTENSIONS,
};

static void PacketizeFlush( decoder_t *p_dec )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    p_sys->b_discontinuity = true;
    date_Set( &p_sys->end_date, VLC_TICK_INVALID );
    p_sys->i_state = STATE_NOSYNC;
    block_BytestreamEmpty( &p_sys->bytestream );
}

static block_t *GetOutBuffer( decoder_t *p_dec )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    if (p_sys->i_input_size == 0)
        return NULL;

    if( !p_sys->b_date_set
     || p_dec->fmt_out.audio.i_rate != p_sys->first.i_rate )
    {
        msg_Dbg( p_dec, "DTS samplerate:%d bitrate:%d",
                 p_sys->first.i_rate, p_sys->first.i_bitrate );

        date_Init( &p_sys->end_date, p_sys->first.i_rate, 1 );
        date_Set( &p_sys->end_date, p_sys->i_pts );
        p_sys->b_date_set = true;
    }

    p_dec->fmt_out.audio.i_rate     = p_sys->first.i_rate;
    if( p_dec->fmt_out.audio.i_bytes_per_frame < p_sys->first.i_frame_size )
        p_dec->fmt_out.audio.i_bytes_per_frame = p_sys->first.i_frame_size;
    p_dec->fmt_out.audio.i_frame_length = p_sys->first.i_frame_length;

    p_dec->fmt_out.audio.i_chan_mode = p_sys->first.i_chan_mode;
    p_dec->fmt_out.audio.i_physical_channels = p_sys->first.i_physical_channels;
    p_dec->fmt_out.audio.i_channels =
        stdc_count_ones( p_dec->fmt_out.audio.i_physical_channels );

    p_dec->fmt_out.i_bitrate = p_sys->first.i_bitrate;

    block_t *p_block = block_Alloc( p_sys->i_input_size );
    if( p_block == NULL )
        return NULL;

    p_block->i_nb_samples = p_sys->first.i_frame_length;
    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_block->i_nb_samples ) - p_block->i_pts;
    return p_block;
}

static block_t *PacketizeBlock( decoder_t *p_dec, block_t **pp_block )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    uint8_t p_header[VLC_DTS_HEADER_SIZE];
    block_t *p_out_buffer;

    block_t *p_block = pp_block ? *pp_block : NULL;

    if( p_block )
    {
        if ( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) ) {
            /* First always drain complete blocks before discontinuity */
            block_t *p_drain = PacketizeBlock( p_dec, NULL );
            if(p_drain)
                return p_drain;

            PacketizeFlush( p_dec );

            if ( p_block->i_flags & BLOCK_FLAG_CORRUPTED ) {
                block_Release( p_block );
                return NULL;
            }
        }

        if ( p_block->i_pts == VLC_TICK_INVALID &&
             date_Get( &p_sys->end_date ) == VLC_TICK_INVALID ) {
            /* We've just started the stream, wait for the first PTS. */
            block_Release( p_block );
            return NULL;
        }

        block_BytestreamPush( &p_sys->bytestream, p_block );
    }

    while( 1 )
    {
        switch( p_sys->i_state )
        {
        case STATE_NOSYNC:
            while( block_PeekBytes( &p_sys->bytestream, p_header, 6 )
                   == VLC_SUCCESS )
            {
                if( vlc_dts_header_IsSync( p_header, 6 ) )
                {
                    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;
            }
            /* fallthrough */

        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_TICK_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;
            /* fallthrough */

        case STATE_HEADER:
            /* Get DTS frame header (VLC_DTS_HEADER_SIZE bytes) */
            if( block_PeekBytes( &p_sys->bytestream, p_header,
                                 VLC_DTS_HEADER_SIZE ) != VLC_SUCCESS )
            {
                /* Need more data */
                return NULL;
            }

            /* Check if frame is valid and get frame info */
            if( vlc_dts_header_Parse( &p_sys->first, p_header,
                                      VLC_DTS_HEADER_SIZE ) != VLC_SUCCESS
             || p_sys->first.i_frame_size == 0 )
            {
                msg_Dbg( p_dec, "emulated sync word" );
                block_SkipByte( &p_sys->bytestream );
                p_sys->i_state = STATE_NOSYNC;
                break;
            }

            if( p_sys->first.syncword == DTS_SYNC_SUBSTREAM )
                p_sys->i_state = STATE_SYNC_SUBSTREAM_EXTENSIONS;
            else
                p_sys->i_state = STATE_NEXT_SYNC;
            p_sys->i_input_size = p_sys->i_next_offset = p_sys->first.i_frame_size;
            break;

        case STATE_SYNC_SUBSTREAM_EXTENSIONS:
            /* Peek into the substream extension (sync + header size < frame_size) */
            if( block_PeekOffsetBytes( &p_sys->bytestream,
                                       p_sys->first.i_substream_header_size,
                                       p_header,
                                       VLC_DTS_HEADER_SIZE ) != VLC_SUCCESS )
            {
                /* Need more data */
                return NULL;
            }

            vlc_dts_header_t xssheader;
            if( vlc_dts_header_Parse( &xssheader, p_header,
                                      VLC_DTS_HEADER_SIZE ) != VLC_SUCCESS )
            {
                msg_Dbg( p_dec, "emulated substream sync word, can't find extension" );
                block_SkipByte( &p_sys->bytestream );
                p_sys->i_state = STATE_NOSYNC;
                break;
            }

            if( xssheader.syncword == DTS_SYNC_SUBSTREAM_LBR )
            {
                /*
                 * LBR exists as independent SUBSTREAM. It is seen valid
                 * only when SUBSTREAM[LBR]..SUBTREAM.
                 * CORE...SUBSTREAM is regular extension.
                 * SUBSTREAM...CORE is sync issue.
                 */
                if (xssheader.i_rate != 0 && xssheader.i_frame_length != 0)
                {
                    p_dec->fmt_out.i_profile = PROFILE_DTS_EXPRESS;
                    p_sys->first.i_rate = xssheader.i_rate;
                    p_sys->first.i_frame_length = xssheader.i_frame_length;
                    p_sys->i_state = STATE_NEXT_SYNC;
                    break;
                }
            }

            msg_Warn( p_dec, "substream without the paired core stream, skip it" );
            p_sys->i_state = STATE_NOSYNC;
            p_dec->fmt_out.i_profile = PROFILE_DTS;
            if( block_SkipBytes( &p_sys->bytestream,
                                 p_sys->first.i_frame_size ) != VLC_SUCCESS )
                return NULL;
            break;

        case STATE_NEXT_SYNC:
            /* Check if next expected frame contains the sync word */
            while( p_sys->i_state == STATE_NEXT_SYNC )
            {
                if( block_PeekOffsetBytes( &p_sys->bytestream,
                                           p_sys->i_next_offset, p_header,
                                           VLC_DTS_HEADER_SIZE )
                                           != VLC_SUCCESS )
                {
                    if( p_block == NULL ) /* drain */
                    {
                        p_sys->i_state = STATE_GET_DATA;
                        break;
                    }
                    /* Need more data */
                    return NULL;
                }

                if( p_header[0] == 0 )
                {
                    /* DTS wav files, audio CD's and some mkvs use stuffing */
                    p_sys->i_next_offset++;
                    continue;
                }

                if( !vlc_dts_header_IsSync( p_header, VLC_DTS_HEADER_SIZE ) )
                {
                    /* Even frame size is likely incorrect FSIZE #18166 */
                    if( (p_sys->first.i_frame_size % 2) && p_sys->i_next_offset > 0 &&
                        block_PeekOffsetBytes( &p_sys->bytestream,
                                               p_sys->i_next_offset - 1, p_header,
                                               VLC_DTS_HEADER_SIZE ) == 0 &&
                         vlc_dts_header_IsSync( p_header, VLC_DTS_HEADER_SIZE ) )
                    {
                        p_sys->i_input_size = p_sys->i_next_offset = p_sys->first.i_frame_size - 1;
                        assert(p_sys->i_input_size);
                        if(p_sys->i_input_size >= VLC_DTS_HEADER_SIZE)
                            break; /* reenter */
                    }
                    msg_Dbg( p_dec, "emulated sync word "
                             "(no sync on following frame)" );
                    p_sys->i_state = STATE_NOSYNC;
                    block_SkipByte( &p_sys->bytestream );
                    break;
                }

                /* Check if a DTS substream packet is located just after
                 * the core packet */
                if( p_sys->i_next_offset == p_sys->first.i_frame_size &&
                    vlc_dts_header_Parse( &p_sys->second,
                                          p_header, VLC_DTS_HEADER_SIZE ) == VLC_SUCCESS &&
                    p_sys->second.syncword == DTS_SYNC_SUBSTREAM )
                {
                    p_sys->i_state = STATE_NEXT_SYNC_SUBSTREAM_EXTENSIONS;
                }
                else
                {
                    p_dec->fmt_out.i_profile = PROFILE_DTS;
                    p_sys->i_state = STATE_GET_DATA;
                }
            }
            break;

        case STATE_NEXT_SYNC_SUBSTREAM_EXTENSIONS:
            assert(p_sys->second.syncword == DTS_SYNC_SUBSTREAM);
            if( p_sys->first.syncword == DTS_SYNC_SUBSTREAM )
            {
                /* First substream must have been LBR */
                p_dec->fmt_out.i_profile = PROFILE_DTS_EXPRESS;
            }
            else /* Otherwise that's core + extensions, we need to output both */
            {
                p_dec->fmt_out.i_profile = PROFILE_DTS_HD;
                p_sys->i_input_size += p_sys->second.i_frame_size;
            }
            p_sys->i_state = STATE_GET_DATA;
            break;

        case STATE_GET_DATA:
            /* Make sure we have enough data. */
            if( block_WaitBytes( &p_sys->bytestream,
                                 p_sys->i_input_size ) != VLC_SUCCESS )
            {
                /* Need more data */
                return NULL;
            }
            p_sys->i_state = STATE_SEND_DATA;
            /* fallthrough */

        case STATE_SEND_DATA:
            if( !(p_out_buffer = GetOutBuffer( p_dec )) )
            {
                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_out_buffer->p_buffer,
                            p_out_buffer->i_buffer );

            /* 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_TICK_INVALID;

            if( p_sys->b_discontinuity )
            {
                p_sys->b_discontinuity = false;
                p_out_buffer->i_flags |= BLOCK_FLAG_DISCONTINUITY;
            }

            /* So p_block doesn't get re-added several times */
            if( pp_block )
                *pp_block = block_BytestreamPop( &p_sys->bytestream );

            p_sys->i_state = STATE_NOSYNC;

            return p_out_buffer;
        }
    }
}

static void Close( 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 );
}

static int Open( vlc_object_t *p_this )
{
    decoder_t *p_dec = (decoder_t*)p_this;
    decoder_sys_t *p_sys;

    if( p_dec->fmt_in->i_codec != VLC_CODEC_DTS )
        return VLC_EGENERIC;

    /* Allocate the memory needed to store the decoder's structure */
    if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
        return VLC_ENOMEM;

    /* Misc init */
    p_sys->i_state = STATE_NOSYNC;
    date_Set( &p_sys->end_date, VLC_TICK_INVALID );
    p_sys->i_pts = VLC_TICK_INVALID;
    p_sys->b_date_set = false;
    p_sys->b_discontinuity = false;
    memset(&p_sys->first, 0, sizeof(vlc_dts_header_t));
    memset(&p_sys->second, 0, sizeof(vlc_dts_header_t));
    block_BytestreamInit( &p_sys->bytestream );

    /* Set output properties (passthrough only) */
    p_dec->fmt_out.i_codec = p_dec->fmt_in->i_codec;
    p_dec->fmt_out.audio = p_dec->fmt_in->audio;

    /* Set callback */
    p_dec->pf_packetize = PacketizeBlock;
    p_dec->pf_flush     = PacketizeFlush;
    p_dec->pf_get_cc    = NULL;
    return VLC_SUCCESS;
}

Coverage Report

Created: 2025-12-14 06:40

Line	Count	Source
1		/*****************************************************************************
2		* dts.c: parse DTS audio sync info and packetize the stream
3		*****************************************************************************
4		* Copyright (C) 2001-2016 VLC authors and VideoLAN
5		*
6		* Authors: Gildas Bazin <gbazin@videolan.org>
7		* Thomas Guillem <thomas@gllm.fr>
8		*
9		* This program is free software; you can redistribute it and/or modify it
10		* under the terms of the GNU Lesser General Public License as published by
11		* the Free Software Foundation; either version 2.1 of the License, or
12		* (at your option) any later version.
13		*
14		* This program is distributed in the hope that it will be useful,
15		* but WITHOUT ANY WARRANTY; without even the implied warranty of
16		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17		* GNU Lesser General Public License for more details.
18		*
19		* You should have received a copy of the GNU Lesser General Public License
20		* along with this program; if not, write to the Free Software Foundation,
21		* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22		*****************************************************************************/
23
24		/*****************************************************************************
25		* Preamble
26		*****************************************************************************/
27		#ifdef HAVE_CONFIG_H
28		# include "config.h"
29		#endif
30
31		#include <stdbit.h>
32
33		#include <vlc_common.h>
34		#include <vlc_plugin.h>
35		#include <vlc_codec.h>
36		#include <vlc_block_helper.h>
37		#include <vlc_modules.h>
38
39		#include "dts_header.h"
40
41		#include "packetizer_helper.h"
42
43		static int Open( vlc_object_t * );
44		static void Close( vlc_object_t * );
45
46	108	vlc_module_begin ()
47	54	set_subcategory( SUBCAT_SOUT_PACKETIZER )
48	54	set_description( N_("DTS audio packetizer") )
49	54	set_capability( "audio packetizer", 10 )
50	108	set_callbacks( Open, Close )
51	54	vlc_module_end ()
52
53		typedef struct
54		{
55		/*
56		* Input properties
57		*/
58		int i_state;
59
60		block_bytestream_t bytestream;
61		size_t i_next_offset;
62
63		/*
64		* Common properties
65		*/
66		date_t end_date;
67		bool b_date_set;
68
69		vlc_tick_t i_pts;
70		bool b_discontinuity;
71
72		vlc_dts_header_t first, second;
73		size_t i_input_size;
74		} decoder_sys_t;
75
76		enum
77		{
78		STATE_SYNC_SUBSTREAM_EXTENSIONS = STATE_CUSTOM_FIRST,
79		STATE_NEXT_SYNC_SUBSTREAM_EXTENSIONS,
80		};
81
82		static void PacketizeFlush( decoder_t *p_dec )
83	0	{
84	0	decoder_sys_t *p_sys = p_dec->p_sys;
85
86	0	p_sys->b_discontinuity = true;
87	0	date_Set( &p_sys->end_date, VLC_TICK_INVALID );
88	0	p_sys->i_state = STATE_NOSYNC;
89	0	block_BytestreamEmpty( &p_sys->bytestream );
90	0	}
91
92		static block_t GetOutBuffer( decoder_t p_dec )
93	220k	{
94	220k	decoder_sys_t *p_sys = p_dec->p_sys;
95	220k	if (p_sys->i_input_size == 0)
96	0	return NULL;
97
98	220k	if( !p_sys->b_date_set
99	219k	\|\| p_dec->fmt_out.audio.i_rate != p_sys->first.i_rate )
100	3.42k	{
101	3.42k	msg_Dbg( p_dec, "DTS samplerate:%d bitrate:%d",
102	3.42k	p_sys->first.i_rate, p_sys->first.i_bitrate );
103
104	3.42k	date_Init( &p_sys->end_date, p_sys->first.i_rate, 1 );
105	3.42k	date_Set( &p_sys->end_date, p_sys->i_pts );
106	3.42k	p_sys->b_date_set = true;
107	3.42k	}
108
109	220k	p_dec->fmt_out.audio.i_rate = p_sys->first.i_rate;
110	220k	if( p_dec->fmt_out.audio.i_bytes_per_frame < p_sys->first.i_frame_size )
111	1.33k	p_dec->fmt_out.audio.i_bytes_per_frame = p_sys->first.i_frame_size;
112	220k	p_dec->fmt_out.audio.i_frame_length = p_sys->first.i_frame_length;
113
114	220k	p_dec->fmt_out.audio.i_chan_mode = p_sys->first.i_chan_mode;
115	220k	p_dec->fmt_out.audio.i_physical_channels = p_sys->first.i_physical_channels;
116	220k	p_dec->fmt_out.audio.i_channels =
117	220k	stdc_count_ones( p_dec->fmt_out.audio.i_physical_channels );
118
119	220k	p_dec->fmt_out.i_bitrate = p_sys->first.i_bitrate;
120
121	220k	block_t *p_block = block_Alloc( p_sys->i_input_size );
122	220k	if( p_block == NULL )
123	0	return NULL;
124
125	220k	p_block->i_nb_samples = p_sys->first.i_frame_length;
126	220k	p_block->i_pts = p_block->i_dts = date_Get( &p_sys->end_date );
127	220k	p_block->i_length =
128	220k	date_Increment( &p_sys->end_date, p_block->i_nb_samples ) - p_block->i_pts;
129	220k	return p_block;
130	220k	}
131
132		static block_t PacketizeBlock( decoder_t p_dec, block_t **pp_block )
133	233k	{
134	233k	decoder_sys_t *p_sys = p_dec->p_sys;
135	233k	uint8_t p_header[VLC_DTS_HEADER_SIZE];
136	233k	block_t *p_out_buffer;
137
138	233k	block_t p_block = pp_block ? pp_block : NULL;
139
140	233k	if( p_block )
141	218k	{
142	218k	if ( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY\|BLOCK_FLAG_CORRUPTED) ) {
143		/* First always drain complete blocks before discontinuity */
144	0	block_t *p_drain = PacketizeBlock( p_dec, NULL );
145	0	if(p_drain)
146	0	return p_drain;
147
148	0	PacketizeFlush( p_dec );
149
150	0	if ( p_block->i_flags & BLOCK_FLAG_CORRUPTED ) {
151	0	block_Release( p_block );
152	0	return NULL;
153	0	}
154	0	}
155
156	218k	if ( p_block->i_pts == VLC_TICK_INVALID &&
157	210k	date_Get( &p_sys->end_date ) == VLC_TICK_INVALID ) {
158		/* We've just started the stream, wait for the first PTS. */
159	706	block_Release( p_block );
160	706	return NULL;
161	706	}
162
163	217k	block_BytestreamPush( &p_sys->bytestream, p_block );
164	217k	}
165
166	8.36M	while( 1 )
167	8.36M	{
168	8.36M	switch( p_sys->i_state )
169	8.36M	{
170	5.27M	case STATE_NOSYNC:
171	90.0M	while( block_PeekBytes( &p_sys->bytestream, p_header, 6 )
172	90.0M	== VLC_SUCCESS )
173	90.0M	{
174	90.0M	if( vlc_dts_header_IsSync( p_header, 6 ) )
175	5.27M	{
176	5.27M	p_sys->i_state = STATE_SYNC;
177	5.27M	break;
178	5.27M	}
179	84.7M	block_SkipByte( &p_sys->bytestream );
180	84.7M	}
181	5.27M	if( p_sys->i_state != STATE_SYNC )
182	2.65k	{
183	2.65k	block_BytestreamFlush( &p_sys->bytestream );
184
185		/* Need more data */
186	2.65k	return NULL;
187	2.65k	}
188		/* fallthrough */
189
190	5.27M	case STATE_SYNC:
191		/* New frame, set the Presentation Time Stamp */
192	5.27M	p_sys->i_pts = p_sys->bytestream.p_block->i_pts;
193	5.27M	if( p_sys->i_pts != VLC_TICK_INVALID &&
194	579k	p_sys->i_pts != date_Get( &p_sys->end_date ) )
195	1.60k	{
196	1.60k	date_Set( &p_sys->end_date, p_sys->i_pts );
197	1.60k	}
198	5.27M	p_sys->i_state = STATE_HEADER;
199		/* fallthrough */
200
201	5.27M	case STATE_HEADER:
202		/* Get DTS frame header (VLC_DTS_HEADER_SIZE bytes) */
203	5.27M	if( block_PeekBytes( &p_sys->bytestream, p_header,
204	5.27M	VLC_DTS_HEADER_SIZE ) != VLC_SUCCESS )
205	1.54k	{
206		/* Need more data */
207	1.54k	return NULL;
208	1.54k	}
209
210		/* Check if frame is valid and get frame info */
211	5.27M	if( vlc_dts_header_Parse( &p_sys->first, p_header,
212	5.27M	VLC_DTS_HEADER_SIZE ) != VLC_SUCCESS
213	3.35M	\|\| p_sys->first.i_frame_size == 0 )
214	2.80M	{
215	2.80M	msg_Dbg( p_dec, "emulated sync word" );
216	2.80M	block_SkipByte( &p_sys->bytestream );
217	2.80M	p_sys->i_state = STATE_NOSYNC;
218	2.80M	break;
219	2.80M	}
220
221	2.47M	if( p_sys->first.syncword == DTS_SYNC_SUBSTREAM )
222	2.24M	p_sys->i_state = STATE_SYNC_SUBSTREAM_EXTENSIONS;
223	227k	else
224	227k	p_sys->i_state = STATE_NEXT_SYNC;
225	2.47M	p_sys->i_input_size = p_sys->i_next_offset = p_sys->first.i_frame_size;
226	2.47M	break;
227
228	2.24M	case STATE_SYNC_SUBSTREAM_EXTENSIONS:
229		/* Peek into the substream extension (sync + header size < frame_size) */
230	2.24M	if( block_PeekOffsetBytes( &p_sys->bytestream,
231	2.24M	p_sys->first.i_substream_header_size,
232	2.24M	p_header,
233	2.24M	VLC_DTS_HEADER_SIZE ) != VLC_SUCCESS )
234	1.25k	{
235		/* Need more data */
236	1.25k	return NULL;
237	1.25k	}
238
239	2.24M	vlc_dts_header_t xssheader;
240	2.24M	if( vlc_dts_header_Parse( &xssheader, p_header,
241	2.24M	VLC_DTS_HEADER_SIZE ) != VLC_SUCCESS )
242	1.98M	{
243	1.98M	msg_Dbg( p_dec, "emulated substream sync word, can't find extension" );
244	1.98M	block_SkipByte( &p_sys->bytestream );
245	1.98M	p_sys->i_state = STATE_NOSYNC;
246	1.98M	break;
247	1.98M	}
248
249	253k	if( xssheader.syncword == DTS_SYNC_SUBSTREAM_LBR )
250	242k	{
251		/*
252		* LBR exists as independent SUBSTREAM. It is seen valid
253		* only when SUBSTREAM[LBR]..SUBTREAM.
254		* CORE...SUBSTREAM is regular extension.
255		* SUBSTREAM...CORE is sync issue.
256		*/
257	242k	if (xssheader.i_rate != 0 && xssheader.i_frame_length != 0)
258	241k	{
259	241k	p_dec->fmt_out.i_profile = PROFILE_DTS_EXPRESS;
260	241k	p_sys->first.i_rate = xssheader.i_rate;
261	241k	p_sys->first.i_frame_length = xssheader.i_frame_length;
262	241k	p_sys->i_state = STATE_NEXT_SYNC;
263	241k	break;
264	241k	}
265	242k	}
266
267	12.2k	msg_Warn( p_dec, "substream without the paired core stream, skip it" );
268	12.2k	p_sys->i_state = STATE_NOSYNC;
269	12.2k	p_dec->fmt_out.i_profile = PROFILE_DTS;
270	12.2k	if( block_SkipBytes( &p_sys->bytestream,
271	12.2k	p_sys->first.i_frame_size ) != VLC_SUCCESS )
272	1.50k	return NULL;
273	10.7k	break;
274
275	501k	case STATE_NEXT_SYNC:
276		/* Check if next expected frame contains the sync word */
277	66.5M	while( p_sys->i_state == STATE_NEXT_SYNC )
278	66.3M	{
279	66.3M	if( block_PeekOffsetBytes( &p_sys->bytestream,
280	66.3M	p_sys->i_next_offset, p_header,
281	66.3M	VLC_DTS_HEADER_SIZE )
282	66.3M	!= VLC_SUCCESS )
283	4.83k	{
284	4.83k	if( p_block == NULL ) /* drain */
285	549	{
286	549	p_sys->i_state = STATE_GET_DATA;
287	549	break;
288	549	}
289		/* Need more data */
290	4.28k	return NULL;
291	4.83k	}
292
293	66.3M	if( p_header[0] == 0 )
294	65.8M	{
295		/* DTS wav files, audio CD's and some mkvs use stuffing */
296	65.8M	p_sys->i_next_offset++;
297	65.8M	continue;
298	65.8M	}
299
300	496k	if( !vlc_dts_header_IsSync( p_header, VLC_DTS_HEADER_SIZE ) )
301	276k	{
302		/* Even frame size is likely incorrect FSIZE #18166 */
303	276k	if( (p_sys->first.i_frame_size % 2) && p_sys->i_next_offset > 0 &&
304	106k	block_PeekOffsetBytes( &p_sys->bytestream,
305	106k	p_sys->i_next_offset - 1, p_header,
306	106k	VLC_DTS_HEADER_SIZE ) == 0 &&
307	106k	vlc_dts_header_IsSync( p_header, VLC_DTS_HEADER_SIZE ) )
308	28.3k	{
309	28.3k	p_sys->i_input_size = p_sys->i_next_offset = p_sys->first.i_frame_size - 1;
310	28.3k	assert(p_sys->i_input_size);
311	28.3k	if(p_sys->i_input_size >= VLC_DTS_HEADER_SIZE)
312	27.8k	break; /* reenter */
313	28.3k	}
314	248k	msg_Dbg( p_dec, "emulated sync word "
315	248k	"(no sync on following frame)" );
316	248k	p_sys->i_state = STATE_NOSYNC;
317	248k	block_SkipByte( &p_sys->bytestream );
318	248k	break;
319	276k	}
320
321		/* Check if a DTS substream packet is located just after
322		* the core packet */
323	220k	if( p_sys->i_next_offset == p_sys->first.i_frame_size &&
324	136k	vlc_dts_header_Parse( &p_sys->second,
325	136k	p_header, VLC_DTS_HEADER_SIZE ) == VLC_SUCCESS &&
326	127k	p_sys->second.syncword == DTS_SYNC_SUBSTREAM )
327	120k	{
328	120k	p_sys->i_state = STATE_NEXT_SYNC_SUBSTREAM_EXTENSIONS;
329	120k	}
330	99.3k	else
331	99.3k	{
332	99.3k	p_dec->fmt_out.i_profile = PROFILE_DTS;
333	99.3k	p_sys->i_state = STATE_GET_DATA;
334	99.3k	}
335	220k	}
336	497k	break;
337
338	497k	case STATE_NEXT_SYNC_SUBSTREAM_EXTENSIONS:
339	120k	assert(p_sys->second.syncword == DTS_SYNC_SUBSTREAM);
340	120k	if( p_sys->first.syncword == DTS_SYNC_SUBSTREAM )
341	119k	{
342		/* First substream must have been LBR */
343	119k	p_dec->fmt_out.i_profile = PROFILE_DTS_EXPRESS;
344	119k	}
345	1.69k	else /* Otherwise that's core + extensions, we need to output both */
346	1.69k	{
347	1.69k	p_dec->fmt_out.i_profile = PROFILE_DTS_HD;
348	1.69k	p_sys->i_input_size += p_sys->second.i_frame_size;
349	1.69k	}
350	120k	p_sys->i_state = STATE_GET_DATA;
351	120k	break;
352
353	221k	case STATE_GET_DATA:
354		/* Make sure we have enough data. */
355	221k	if( block_WaitBytes( &p_sys->bytestream,
356	221k	p_sys->i_input_size ) != VLC_SUCCESS )
357	1.08k	{
358		/* Need more data */
359	1.08k	return NULL;
360	1.08k	}
361	220k	p_sys->i_state = STATE_SEND_DATA;
362		/* fallthrough */
363
364	220k	case STATE_SEND_DATA:
365	220k	if( !(p_out_buffer = GetOutBuffer( p_dec )) )
366	0	{
367	0	return NULL;
368	0	}
369
370		/* Copy the whole frame into the buffer. When we reach this point
371		* we already know we have enough data available. */
372	220k	block_GetBytes( &p_sys->bytestream, p_out_buffer->p_buffer,
373	220k	p_out_buffer->i_buffer );
374
375		/* Make sure we don't reuse the same pts twice */
376	220k	if( p_sys->i_pts == p_sys->bytestream.p_block->i_pts )
377	220k	p_sys->i_pts = p_sys->bytestream.p_block->i_pts = VLC_TICK_INVALID;
378
379	220k	if( p_sys->b_discontinuity )
380	0	{
381	0	p_sys->b_discontinuity = false;
382	0	p_out_buffer->i_flags \|= BLOCK_FLAG_DISCONTINUITY;
383	0	}
384
385		/* So p_block doesn't get re-added several times */
386	220k	if( pp_block )
387	207k	*pp_block = block_BytestreamPop( &p_sys->bytestream );
388
389	220k	p_sys->i_state = STATE_NOSYNC;
390
391	220k	return p_out_buffer;
392	8.36M	}
393	8.36M	}
394	232k	}
395
396		static void Close( vlc_object_t *p_this )
397	2.79k	{
398	2.79k	decoder_t p_dec = (decoder_t)p_this;
399	2.79k	decoder_sys_t *p_sys = p_dec->p_sys;
400
401	2.79k	block_BytestreamRelease( &p_sys->bytestream );
402
403	2.79k	free( p_sys );
404	2.79k	}
405
406		static int Open( vlc_object_t *p_this )
407	3.07M	{
408	3.07M	decoder_t p_dec = (decoder_t)p_this;
409	3.07M	decoder_sys_t *p_sys;
410
411	3.07M	if( p_dec->fmt_in->i_codec != VLC_CODEC_DTS )
412	3.07M	return VLC_EGENERIC;
413
414		/* Allocate the memory needed to store the decoder's structure */
415	2.79k	if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
416	0	return VLC_ENOMEM;
417
418		/* Misc init */
419	2.79k	p_sys->i_state = STATE_NOSYNC;
420	2.79k	date_Set( &p_sys->end_date, VLC_TICK_INVALID );
421	2.79k	p_sys->i_pts = VLC_TICK_INVALID;
422	2.79k	p_sys->b_date_set = false;
423	2.79k	p_sys->b_discontinuity = false;
424	2.79k	memset(&p_sys->first, 0, sizeof(vlc_dts_header_t));
425	2.79k	memset(&p_sys->second, 0, sizeof(vlc_dts_header_t));
426	2.79k	block_BytestreamInit( &p_sys->bytestream );
427
428		/* Set output properties (passthrough only) */
429	2.79k	p_dec->fmt_out.i_codec = p_dec->fmt_in->i_codec;
430	2.79k	p_dec->fmt_out.audio = p_dec->fmt_in->audio;
431
432		/* Set callback */
433	2.79k	p_dec->pf_packetize = PacketizeBlock;
434	2.79k	p_dec->pf_flush = PacketizeFlush;
435	2.79k	p_dec->pf_get_cc = NULL;
436	2.79k	return VLC_SUCCESS;
437	2.79k	}