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vlc/modules/demux/mpeg/es.c

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/*****************************************************************************
* es.c : Generic audio ES input module for vlc
*****************************************************************************
* Copyright (C) 2001-2008 VLC authors and VideoLAN
* $Id$
*
* Authors: Laurent Aimar <fenrir@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 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 <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_demux.h>
#include <vlc_codec.h>
#include <vlc_codecs.h>
#include <vlc_input.h>
#include "../../packetizer/a52.h"
#include "../../packetizer/dts_header.h"
#include "../meta_engine/ID3Tag.h"
#include "../meta_engine/ID3Text.h"
#include "../meta_engine/ID3Meta.h"
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int OpenAudio( vlc_object_t * );
static int OpenVideo( vlc_object_t * );
static void Close ( vlc_object_t * );
#define FPS_TEXT N_("Frames per Second")
#define FPS_LONGTEXT N_("This is the frame rate used as a fallback when " \
"playing MPEG video elementary streams.")
vlc_module_begin ()
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_DEMUX )
set_description( N_("MPEG-I/II/4 / A52 / DTS / MLP audio" ) )
set_shortname( N_("Audio ES") )
set_capability( "demux", 155 )
set_callbacks( OpenAudio, Close )
add_shortcut( "mpga", "mp3",
"m4a", "mp4a", "aac",
"ac3", "a52",
"eac3",
"dts",
"mlp", "thd" )
add_submodule()
set_description( N_("MPEG-4 video" ) )
set_capability( "demux", 0 )
set_callbacks( OpenVideo, Close )
add_float( "es-fps", 25, FPS_TEXT, FPS_LONGTEXT, false )
add_shortcut( "m4v" )
add_shortcut( "mp4v" )
vlc_module_end ()
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Demux ( demux_t * );
static int Control( demux_t *, int, va_list );
typedef struct
{
vlc_fourcc_t i_codec;
bool b_use_word;
const char *psz_name;
int (*pf_probe)( demux_t *p_demux, int64_t *pi_offset );
int (*pf_init)( demux_t *p_demux );
} codec_t;
typedef struct
{
char psz_version[10];
int i_lowpass;
} lame_extra_t;
typedef struct
{
vlc_tick_t i_time;
uint64_t i_pos;
bs_t br;
} sync_table_ctx_t;
typedef struct
{
uint16_t i_frames_btw_refs;
uint32_t i_bytes_btw_refs;
uint32_t i_ms_btw_refs;
uint8_t i_bits_per_bytes_dev;
uint8_t i_bits_per_ms_dev;
uint8_t *p_bits;
size_t i_bits;
sync_table_ctx_t current;
} sync_table_t;
typedef struct
{
codec_t codec;
vlc_fourcc_t i_original;
es_out_id_t *p_es;
bool b_start;
decoder_t *p_packetizer;
block_t *p_packetized_data;
vlc_tick_t i_pts;
vlc_tick_t i_time_offset;
int64_t i_bytes;
bool b_big_endian;
bool b_estimate_bitrate;
int i_bitrate_avg; /* extracted from Xing header */
bool b_initial_sync_failed;
int i_packet_size;
int64_t i_stream_offset;
float f_fps;
/* Mpga specific */
struct
{
int i_frames;
int i_bytes;
int i_bitrate_avg;
int i_frame_samples;
lame_extra_t lame;
bool b_lame;
} xing;
float rgf_replay_gain[AUDIO_REPLAY_GAIN_MAX];
float rgf_replay_peak[AUDIO_REPLAY_GAIN_MAX];
sync_table_t mllt;
} demux_sys_t;
static int MpgaProbe( demux_t *p_demux, int64_t *pi_offset );
static int MpgaInit( demux_t *p_demux );
static int AacProbe( demux_t *p_demux, int64_t *pi_offset );
static int AacInit( demux_t *p_demux );
static int EA52Probe( demux_t *p_demux, int64_t *pi_offset );
static int A52Probe( demux_t *p_demux, int64_t *pi_offset );
static int A52Init( demux_t *p_demux );
static int DtsProbe( demux_t *p_demux, int64_t *pi_offset );
static int DtsInit( demux_t *p_demux );
static int MlpProbe( demux_t *p_demux, int64_t *pi_offset );
static int ThdProbe( demux_t *p_demux, int64_t *pi_offset );
static int MlpInit( demux_t *p_demux );
static bool Parse( demux_t *p_demux, block_t **pp_output );
static uint64_t SeekByMlltTable( demux_t *p_demux, vlc_tick_t *pi_time );
static const codec_t p_codecs[] = {
{ VLC_CODEC_MP4A, false, "mp4 audio", AacProbe, AacInit },
{ VLC_CODEC_MPGA, false, "mpeg audio", MpgaProbe, MpgaInit },
{ VLC_CODEC_A52, true, "a52 audio", A52Probe, A52Init },
{ VLC_CODEC_EAC3, true, "eac3 audio", EA52Probe, A52Init },
{ VLC_CODEC_DTS, false, "dts audio", DtsProbe, DtsInit },
{ VLC_CODEC_MLP, false, "mlp audio", MlpProbe, MlpInit },
{ VLC_CODEC_TRUEHD, false, "TrueHD audio", ThdProbe, MlpInit },
{ 0, false, NULL, NULL, NULL }
};
static int VideoInit( demux_t *p_demux );
static const codec_t codec_m4v = {
VLC_CODEC_MP4V, false, "mp4 video", NULL, VideoInit
};
/*****************************************************************************
* OpenCommon: initializes demux structures
*****************************************************************************/
static int OpenCommon( demux_t *p_demux,
int i_cat, const codec_t *p_codec, int64_t i_bs_offset )
{
demux_sys_t *p_sys;
es_format_t fmt;
DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
memset( p_sys, 0, sizeof( demux_sys_t ) );
p_sys->codec = *p_codec;
p_sys->p_es = NULL;
p_sys->b_start = true;
p_sys->i_stream_offset = i_bs_offset;
p_sys->b_estimate_bitrate = true;
p_sys->i_bitrate_avg = 0;
p_sys->b_big_endian = false;
p_sys->f_fps = var_InheritFloat( p_demux, "es-fps" );
p_sys->p_packetized_data = NULL;
if( vlc_stream_Seek( p_demux->s, p_sys->i_stream_offset ) )
{
free( p_sys );
return VLC_EGENERIC;
}
if( p_sys->codec.pf_init( p_demux ) )
{
free( p_sys );
return VLC_EGENERIC;
}
msg_Dbg( p_demux, "detected format %4.4s", (const char*)&p_sys->codec.i_codec );
/* Load the audio packetizer */
es_format_Init( &fmt, i_cat, p_sys->codec.i_codec );
fmt.i_original_fourcc = p_sys->i_original;
p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, p_sys->codec.psz_name );
if( !p_sys->p_packetizer )
{
free( p_sys );
return VLC_EGENERIC;
}
es_format_t *p_fmt = &p_sys->p_packetizer->fmt_out;
for( int i = 0; i < AUDIO_REPLAY_GAIN_MAX; i++ )
{
if ( p_sys->rgf_replay_gain[i] != 0.0 )
{
p_fmt->audio_replay_gain.pb_gain[i] = true;
p_fmt->audio_replay_gain.pf_gain[i] = p_sys->rgf_replay_gain[i];
}
if ( p_sys->rgf_replay_peak[i] != 0.0 )
{
p_fmt->audio_replay_gain.pb_peak[i] = true;
p_fmt->audio_replay_gain.pf_peak[i] = p_sys->rgf_replay_peak[i];
}
}
for( ;; )
{
if( Parse( p_demux, &p_sys->p_packetized_data ) )
break;
if( p_sys->p_packetized_data )
break;
}
return VLC_SUCCESS;
}
static int OpenAudio( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t*)p_this;
for( int i = 0; p_codecs[i].i_codec != 0; i++ )
{
int64_t i_offset;
if( !p_codecs[i].pf_probe( p_demux, &i_offset ) )
return OpenCommon( p_demux, AUDIO_ES, &p_codecs[i], i_offset );
}
return VLC_EGENERIC;
}
static int OpenVideo( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t*)p_this;
/* Only m4v is supported for the moment */
bool b_m4v_ext = demux_IsPathExtension( p_demux, ".m4v" );
bool b_m4v_forced = demux_IsForced( p_demux, "m4v" ) ||
demux_IsForced( p_demux, "mp4v" );
if( !b_m4v_ext && !b_m4v_forced )
return VLC_EGENERIC;
const uint8_t *p_peek;
if( vlc_stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
return VLC_EGENERIC;
if( p_peek[0] != 0x00 || p_peek[1] != 0x00 || p_peek[2] != 0x01 )
{
if( !b_m4v_forced)
return VLC_EGENERIC;
msg_Warn( p_demux,
"this doesn't look like an MPEG ES stream, continuing anyway" );
}
return OpenCommon( p_demux, VIDEO_ES, &codec_m4v, 0 );
}
/*****************************************************************************
* 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 )
{
int ret = 1;
demux_sys_t *p_sys = p_demux->p_sys;
block_t *p_block_out = p_sys->p_packetized_data;
if( p_block_out )
p_sys->p_packetized_data = NULL;
else
ret = Parse( p_demux, &p_block_out ) ? 0 : 1;
while( p_block_out )
{
block_t *p_next = p_block_out->p_next;
/* Correct timestamp */
if( p_sys->p_packetizer->fmt_out.i_cat == VIDEO_ES )
{
if( p_block_out->i_pts == VLC_TICK_INVALID &&
p_block_out->i_dts == VLC_TICK_INVALID )
p_block_out->i_dts = VLC_TICK_0 + p_sys->i_pts + CLOCK_FREQ / p_sys->f_fps;
if( p_block_out->i_dts != VLC_TICK_INVALID )
p_sys->i_pts = p_block_out->i_dts - VLC_TICK_0;
}
else
{
p_sys->i_pts = p_block_out->i_pts - VLC_TICK_0;
}
if( p_block_out->i_pts != VLC_TICK_INVALID )
{
p_block_out->i_pts += p_sys->i_time_offset;
}
if( p_block_out->i_dts != VLC_TICK_INVALID )
{
p_block_out->i_dts += p_sys->i_time_offset;
es_out_SetPCR( p_demux->out, p_block_out->i_dts );
}
/* Re-estimate bitrate */
if( p_sys->b_estimate_bitrate && p_sys->i_pts > VLC_TICK_FROM_MS(500) )
p_sys->i_bitrate_avg = 8 * CLOCK_FREQ * p_sys->i_bytes
/ (p_sys->i_pts - 1);
p_sys->i_bytes += p_block_out->i_buffer;
p_block_out->p_next = NULL;
es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
p_block_out = p_next;
}
return ret;
}
/*****************************************************************************
* 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;
if( p_sys->p_packetized_data )
block_ChainRelease( p_sys->p_packetized_data );
if( p_sys->mllt.p_bits )
free( p_sys->mllt.p_bits );
demux_PacketizerDestroy( p_sys->p_packetizer );
free( p_sys );
}
/*****************************************************************************
* Control:
*****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
demux_sys_t *p_sys = p_demux->p_sys;
int64_t *pi64;
bool *pb_bool;
switch( i_query )
{
case DEMUX_HAS_UNSUPPORTED_META:
pb_bool = va_arg( args, bool * );
*pb_bool = true;
return VLC_SUCCESS;
case DEMUX_GET_TIME:
pi64 = va_arg( args, int64_t * );
*pi64 = p_sys->i_pts + p_sys->i_time_offset;
return VLC_SUCCESS;
case DEMUX_GET_LENGTH:
{
va_list ap;
int i_ret;
va_copy ( ap, args );
i_ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset,
-1, p_sys->i_bitrate_avg, 1, i_query, ap );
va_end( ap );
/* No bitrate, we can't have it precisely, but we can compute
* a raw approximation with time/position */
if( i_ret && !p_sys->i_bitrate_avg )
{
float f_pos = (double)(uint64_t)( vlc_stream_Tell( p_demux->s ) ) /
(double)(uint64_t)( stream_Size( p_demux->s ) );
/* The first few seconds are guaranteed to be very whacky,
* don't bother trying ... Too bad */
if( f_pos < 0.01f ||
(p_sys->i_pts + p_sys->i_time_offset) < 8000000 )
{
return VLC_EGENERIC;
}
pi64 = va_arg( args, int64_t * );
*pi64 = (p_sys->i_pts + p_sys->i_time_offset) / f_pos;
return VLC_SUCCESS;
}
return i_ret;
}
case DEMUX_SET_TIME:
if( p_sys->mllt.p_bits )
{
int64_t i_time = va_arg(args, int64_t);
uint64_t i_pos = SeekByMlltTable( p_demux, &i_time );
int i_ret = vlc_stream_Seek( p_demux->s, p_sys->i_stream_offset + i_pos );
if( i_ret != VLC_SUCCESS )
return i_ret;
p_sys->i_time_offset = i_time - p_sys->i_pts;
/* And reset buffered data */
if( p_sys->p_packetized_data )
block_ChainRelease( p_sys->p_packetized_data );
p_sys->p_packetized_data = NULL;
return VLC_SUCCESS;
}
/* FIXME TODO: implement a high precision seek (with mp3 parsing)
* needed for multi-input */
break;
}
int ret = demux_vaControlHelper( p_demux->s, p_sys->i_stream_offset, -1,
p_sys->i_bitrate_avg, 1, i_query, args );
if( ret != VLC_SUCCESS )
return ret;
if( p_sys->i_bitrate_avg > 0
&& (i_query == DEMUX_SET_POSITION || i_query == DEMUX_SET_TIME) )
{
int64_t i_time = INT64_C(8000000)
* ( vlc_stream_Tell(p_demux->s) - p_sys->i_stream_offset )
/ p_sys->i_bitrate_avg;
/* Fix time_offset */
if( i_time >= 0 )
p_sys->i_time_offset = i_time - p_sys->i_pts;
/* And reset buffered data */
if( p_sys->p_packetized_data )
block_ChainRelease( p_sys->p_packetized_data );
p_sys->p_packetized_data = NULL;
}
return VLC_SUCCESS;
}
/*****************************************************************************
* Makes a link list of buffer of parsed data
* Returns true if EOF
*****************************************************************************/
static bool Parse( demux_t *p_demux, block_t **pp_output )
{
demux_sys_t *p_sys = p_demux->p_sys;
block_t *p_block_in, *p_block_out;
*pp_output = NULL;
if( p_sys->codec.b_use_word )
{
/* Make sure we are word aligned */
int64_t i_pos = vlc_stream_Tell( p_demux->s );
if( (i_pos & 1) && vlc_stream_Read( p_demux->s, NULL, 1 ) != 1 )
return true;
}
p_block_in = vlc_stream_Block( p_demux->s, p_sys->i_packet_size );
bool b_eof = p_block_in == NULL;
if( p_block_in )
{
if( p_sys->codec.b_use_word && !p_sys->b_big_endian && p_block_in->i_buffer > 0 )
{
/* Convert to big endian */
swab( p_block_in->p_buffer, p_block_in->p_buffer, p_block_in->i_buffer );
}
p_block_in->i_pts = p_block_in->i_dts = p_sys->b_start || p_sys->b_initial_sync_failed ? VLC_TICK_0 : VLC_TICK_INVALID;
}
p_sys->b_initial_sync_failed = p_sys->b_start; /* Only try to resync once */
while( ( p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, p_block_in ? &p_block_in : NULL ) ) )
{
p_sys->b_initial_sync_failed = false;
while( p_block_out )
{
if( !p_sys->p_es )
{
p_sys->p_packetizer->fmt_out.b_packetized = true;
p_sys->p_es = es_out_Add( p_demux->out,
&p_sys->p_packetizer->fmt_out);
/* Try the xing header */
if( p_sys->xing.i_bytes && p_sys->xing.i_frames &&
p_sys->xing.i_frame_samples )
{
p_sys->i_bitrate_avg = p_sys->xing.i_bytes * INT64_C(8) *
p_sys->p_packetizer->fmt_out.audio.i_rate /
p_sys->xing.i_frames / p_sys->xing.i_frame_samples;
if( p_sys->i_bitrate_avg > 0 )
p_sys->b_estimate_bitrate = false;
}
/* Use the bitrate as initual value */
if( p_sys->b_estimate_bitrate )
p_sys->i_bitrate_avg = p_sys->p_packetizer->fmt_out.i_bitrate;
}
block_t *p_next = p_block_out->p_next;
p_block_out->p_next = NULL;
block_ChainLastAppend( &pp_output, p_block_out );
p_block_out = p_next;
}
}
if( p_sys->b_initial_sync_failed )
msg_Dbg( p_demux, "did not sync on first block" );
p_sys->b_start = false;
return b_eof;
}
/* Check to apply to WAVE fmt header */
static int GenericFormatCheck( int i_format, const uint8_t *p_head )
{
if ( i_format == WAVE_FORMAT_PCM )
{
if( GetWLE( p_head /* nChannels */ ) != 2 )
return VLC_EGENERIC;
if( GetDWLE( p_head + 2 /* nSamplesPerSec */ ) != 44100 )
return VLC_EGENERIC;
}
return VLC_SUCCESS;
}
/*****************************************************************************
* Wav header skipper
*****************************************************************************/
#define WAV_PROBE_SIZE (512*1024)
static int WavSkipHeader( demux_t *p_demux, int *pi_skip, const int pi_format[],
int (*pf_format_check)( int, const uint8_t * ) )
{
const uint8_t *p_peek;
int i_peek = 0;
uint32_t i_len;
/* */
*pi_skip = 0;
/* Check if we are dealing with a WAV file */
if( vlc_stream_Peek( p_demux->s, &p_peek, 12+8 ) != 12 + 8 )
return VLC_SUCCESS;
if( memcmp( p_peek, "RIFF", 4 ) || memcmp( &p_peek[8], "WAVE", 4 ) )
return VLC_SUCCESS;
/* Find the wave format header */
i_peek = 12 + 8;
while( memcmp( p_peek + i_peek - 8, "fmt ", 4 ) )
{
i_len = GetDWLE( p_peek + i_peek - 4 );
if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
return VLC_EGENERIC;
i_peek += i_len + 8;
if( vlc_stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
return VLC_EGENERIC;
}
/* Sanity check the wave format header */
i_len = GetDWLE( p_peek + i_peek - 4 );
if( i_len > WAV_PROBE_SIZE )
return VLC_EGENERIC;
i_peek += i_len + 8;
if( vlc_stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
return VLC_EGENERIC;
const int i_format = GetWLE( p_peek + i_peek - i_len - 8 /* wFormatTag */ );
int i_format_idx;
for( i_format_idx = 0; pi_format[i_format_idx] != WAVE_FORMAT_UNKNOWN; i_format_idx++ )
{
if( i_format == pi_format[i_format_idx] )
break;
}
if( pi_format[i_format_idx] == WAVE_FORMAT_UNKNOWN )
return VLC_EGENERIC;
if( pf_format_check &&
pf_format_check( i_format, p_peek + i_peek - i_len - 6 ) != VLC_SUCCESS )
return VLC_EGENERIC;
/* Skip the wave header */
while( memcmp( p_peek + i_peek - 8, "data", 4 ) )
{
i_len = GetDWLE( p_peek + i_peek - 4 );
if( i_len > WAV_PROBE_SIZE || i_peek + i_len > WAV_PROBE_SIZE )
return VLC_EGENERIC;
i_peek += i_len + 8;
if( vlc_stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek )
return VLC_EGENERIC;
}
*pi_skip = i_peek;
return VLC_SUCCESS;
}
static int GenericProbe( demux_t *p_demux, int64_t *pi_offset,
const char * ppsz_name[],
int (*pf_check)( const uint8_t *, int * ), int i_check_size,
const int pi_wav_format[],
int (*pf_format_check)( int, const uint8_t * ) )
{
bool b_forced_demux;
int64_t i_offset;
const uint8_t *p_peek;
int i_skip;
b_forced_demux = false;
for( int i = 0; ppsz_name[i] != NULL; i++ )
{
b_forced_demux |= demux_IsForced( p_demux, ppsz_name[i] );
}
i_offset = vlc_stream_Tell( p_demux->s );
if( WavSkipHeader( p_demux, &i_skip, pi_wav_format, pf_format_check ) )
{
if( !b_forced_demux )
return VLC_EGENERIC;
}
const bool b_wav = i_skip > 0;
/* peek the begining
* It is common that wav files have some sort of garbage at the begining
* We will accept probing 0.5s of data in this case.
*/
const int i_probe = i_skip + i_check_size + 8000 + ( b_wav ? (44000/2*2*2) : 0);
const int i_peek = vlc_stream_Peek( p_demux->s, &p_peek, i_probe );
if( i_peek < i_skip + i_check_size )
{
msg_Dbg( p_demux, "cannot peek" );
return VLC_EGENERIC;
}
for( ;; )
{
if( i_skip + i_check_size > i_peek )
{
if( !b_forced_demux )
return VLC_EGENERIC;
break;
}
int i_samples = 0;
int i_size = pf_check( &p_peek[i_skip], &i_samples );
if( i_size >= 0 )
{
if( i_size == 0 || /* 0 sized frame ?? */
i_skip == 0 /* exact match from start, we're not WAVE either, so skip multiple checks (would break if padding) */ )
break;
/* If we have the frame size, check the next frame for
* extra robustness
* The second test is because some .wav have paddings
*/
bool b_ok = false;
for( int t = 0; t < 1 + !!b_wav; t++ )
{
if( t == 1 )
{
if(!i_samples)
break;
i_size = i_samples * 2 * 2;
}
if( i_skip + i_check_size + i_size <= i_peek )
{
b_ok = pf_check( &p_peek[i_skip+i_size], NULL ) >= 0;
if( b_ok )
break;
}
}
if( b_ok )
break;
}
i_skip++;
if( !b_wav && !b_forced_demux )
return VLC_EGENERIC;
}
*pi_offset = i_offset + i_skip;
return VLC_SUCCESS;
}
/*****************************************************************************
* Mpeg I/II Audio
*****************************************************************************/
static int MpgaCheckSync( const uint8_t *p_peek )
{
uint32_t h = GetDWBE( p_peek );
if( ((( h >> 21 )&0x07FF) != 0x07FF ) /* header sync */
|| (((h >> 19)&0x03) == 1 ) /* valid version ID ? */
|| (((h >> 17)&0x03) == 0 ) /* valid layer ?*/
|| (((h >> 12)&0x0F) == 0x0F ) /* valid bitrate ?*/
|| (((h >> 10) & 0x03) == 0x03 ) /* valide sampling freq ? */
|| ((h & 0x03) == 0x02 )) /* valid emphasis ? */
{
return false;
}
return true;
}
#define MPGA_VERSION( h ) ( 1 - (((h)>>19)&0x01) )
#define MPGA_MODE(h) (((h)>> 6)&0x03)
static int MpgaGetFrameSamples( uint32_t h )
{
const int i_layer = 3 - (((h)>>17)&0x03);
switch( i_layer )
{
case 0:
return 384;
case 1:
return 1152;
case 2:
return MPGA_VERSION(h) ? 576 : 1152;
default:
return 0;
}
}
static int MpgaProbe( demux_t *p_demux, int64_t *pi_offset )
{
const int pi_wav[] = { WAVE_FORMAT_MPEG, WAVE_FORMAT_MPEGLAYER3, WAVE_FORMAT_UNKNOWN };
bool b_forced;
bool b_forced_demux;
int64_t i_offset;
const uint8_t *p_peek;
int i_skip;
b_forced = demux_IsPathExtension( p_demux, ".mp3" );
b_forced_demux = demux_IsForced( p_demux, "mp3" ) ||
demux_IsForced( p_demux, "mpga" );
i_offset = vlc_stream_Tell( p_demux->s );
if( WavSkipHeader( p_demux, &i_skip, pi_wav, NULL ) )
{
if( !b_forced_demux )
return VLC_EGENERIC;
return VLC_EGENERIC;
}
if( vlc_stream_Peek( p_demux->s, &p_peek, i_skip + 4 ) < i_skip + 4 )
return VLC_EGENERIC;
if( !MpgaCheckSync( &p_peek[i_skip] ) )
{
bool b_ok = false;
int i_peek;
if( !b_forced_demux && !b_forced )
return VLC_EGENERIC;
i_peek = vlc_stream_Peek( p_demux->s, &p_peek, i_skip + 8096 );
while( i_skip + 4 < i_peek )
{
if( MpgaCheckSync( &p_peek[i_skip] ) )
{
b_ok = true;
break;
}
i_skip++;
}
if( !b_ok && !b_forced_demux )
return VLC_EGENERIC;
}
*pi_offset = i_offset + i_skip;
return VLC_SUCCESS;
}
static void MpgaXingSkip( const uint8_t **pp_xing, int *pi_xing, int i_count )
{
if(i_count > *pi_xing )
i_count = *pi_xing;
(*pp_xing) += i_count;
(*pi_xing) -= i_count;
}
static uint32_t MpgaXingGetDWBE( const uint8_t **pp_xing, int *pi_xing, uint32_t i_default )
{
if( *pi_xing < 4 )
return i_default;
uint32_t v = GetDWBE( *pp_xing );
MpgaXingSkip( pp_xing, pi_xing, 4 );
return v;
}
static uint16_t MpgaXingGetWBE( const uint8_t **pp_xing, int *pi_xing, uint16_t i_default )
{
if( *pi_xing < 2 )
return i_default;
uint16_t v = GetWBE( *pp_xing );
MpgaXingSkip( pp_xing, pi_xing, 2 );
return v;
}
static double MpgaXingLameConvertGain( uint16_t x )
{
double gain = (x & 0x1FF) / 10.0;
return x & 0x200 ? -gain : gain;
}
static double MpgaXingLameConvertPeak( uint32_t x )
{
return x / 8388608.0; /* pow(2, 23) */
}
static uint64_t SeekByMlltTable( demux_t *p_demux, vlc_tick_t *pi_time )
{
demux_sys_t *p_sys = p_demux->p_sys;
sync_table_ctx_t *p_cur = &p_sys->mllt.current;
/* reset or init context */
if( *pi_time < p_cur->i_time || !p_cur->br.p )
{
p_cur->i_time = 0;
p_cur->i_pos = 0;
bs_init(&p_cur->br, p_sys->mllt.p_bits, p_sys->mllt.i_bits);
}
while(bs_remain(&p_cur->br) >= p_sys->mllt.i_bits_per_bytes_dev + p_sys->mllt.i_bits_per_ms_dev)
{
const uint32_t i_bytesdev = bs_read(&p_cur->br, p_sys->mllt.i_bits_per_bytes_dev);
const uint32_t i_msdev = bs_read(&p_cur->br, p_sys->mllt.i_bits_per_ms_dev);
const vlc_tick_t i_deltatime = (p_sys->mllt.i_ms_btw_refs + i_msdev) * INT64_C(1000);
if( p_cur->i_time + i_deltatime > *pi_time )
break;
p_cur->i_time += i_deltatime;
p_cur->i_pos += p_sys->mllt.i_bytes_btw_refs + i_bytesdev;
}
*pi_time = p_cur->i_time;
return p_cur->i_pos;
}
static int ID3TAG_Parse_Handler( uint32_t i_tag, const uint8_t *p_payload, size_t i_payload, void *p_priv )
{
demux_t *p_demux = (demux_t *) p_priv;
demux_sys_t *p_sys = p_demux->p_sys;
if( i_tag == VLC_FOURCC('M', 'L', 'L', 'T') )
{
if( i_payload > 20 )
{
p_sys->mllt.i_frames_btw_refs = GetWBE(p_payload);
p_sys->mllt.i_bytes_btw_refs = GetDWBE(&p_payload[1]) & 0x00FFFFFF;
p_sys->mllt.i_ms_btw_refs = GetDWBE(&p_payload[4]) & 0x00FFFFFF;
if( !p_sys->mllt.i_frames_btw_refs || !p_sys->mllt.i_bytes_btw_refs ||
!p_sys->mllt.i_ms_btw_refs ||
p_payload[8] > 31 || p_payload[9] > 31 || /* bits length sanity check */
((p_payload[8] + p_payload[9]) % 4) || p_payload[8] + p_payload[9] < 4 )
return VLC_EGENERIC;
p_sys->mllt.i_bits_per_bytes_dev = p_payload[8];
p_sys->mllt.i_bits_per_ms_dev = p_payload[9];
p_sys->mllt.p_bits = malloc(i_payload - 10);
if( likely(p_sys->mllt.p_bits) )
{
p_sys->mllt.i_bits = i_payload - 10;
memcpy(p_sys->mllt.p_bits, &p_payload[10], p_sys->mllt.i_bits);
msg_Dbg(p_demux, "read MLLT sync table with %zu entries",
(p_sys->mllt.i_bits * 8) / (p_sys->mllt.i_bits_per_bytes_dev + p_sys->mllt.i_bits_per_ms_dev) );
}
}
return VLC_EGENERIC;
}
else if( i_tag == VLC_FOURCC('T', 'X', 'X', 'X') )
{
vlc_meta_t *p_meta = vlc_meta_New();
if( p_meta )
{
bool b_updated;
if( ID3HandleTag( p_payload, i_payload, i_tag, p_meta, &b_updated ) )
{
char ** ppsz_keys = vlc_meta_CopyExtraNames( p_meta );
if( ppsz_keys )
{
for( size_t i = 0; ppsz_keys[i]; ++i )
{
float *pf = NULL;
if( !strcasecmp( ppsz_keys[i], "REPLAYGAIN_TRACK_GAIN" ) )
pf = &p_sys->rgf_replay_gain[AUDIO_REPLAY_GAIN_TRACK];
else if( !strcasecmp( ppsz_keys[i], "REPLAYGAIN_TRACK_PEAK" ) )
pf = &p_sys->rgf_replay_peak[AUDIO_REPLAY_GAIN_TRACK];
else if( !strcasecmp( ppsz_keys[i], "REPLAYGAIN_ALBUM_GAIN" ) )
pf = &p_sys->rgf_replay_gain[AUDIO_REPLAY_GAIN_ALBUM];
else if( !strcasecmp( ppsz_keys[i], "REPLAYGAIN_ALBUM_PEAK" ) )
pf = &p_sys->rgf_replay_peak[AUDIO_REPLAY_GAIN_ALBUM];
if( pf )
{
const char *psz_val = vlc_meta_GetExtra( p_meta, ppsz_keys[i] );
if( psz_val )
*pf = us_atof( psz_val );
}
free( ppsz_keys[i] );
}
free( ppsz_keys );
}
}
vlc_meta_Delete( p_meta );
}
}
return VLC_SUCCESS;
}
static int ID3Parse( demux_t *p_demux,
int (*pf_callback)(uint32_t, const uint8_t *, size_t, void *) )
{
const block_t *p_tags = NULL;
if( vlc_stream_Control( p_demux->s, STREAM_GET_TAGS, &p_tags ) != VLC_SUCCESS )
return VLC_EGENERIC;
for( ; p_tags; p_tags = p_tags->p_next )
ID3TAG_Parse( p_tags->p_buffer, p_tags->i_buffer, pf_callback, (void *) p_demux );
return VLC_SUCCESS;
}
static int MpgaInit( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
const uint8_t *p_peek;
int i_peek;
/* */
p_sys->i_packet_size = 1024;
ID3Parse( p_demux, ID3TAG_Parse_Handler );
/* Load a potential xing header */
i_peek = vlc_stream_Peek( p_demux->s, &p_peek, 4 + 1024 );
if( i_peek < 4 + 21 )
return VLC_SUCCESS;
const uint32_t header = GetDWBE( p_peek );
if( !MpgaCheckSync( p_peek ) )
return VLC_SUCCESS;
/* Xing header */
const uint8_t *p_xing = p_peek;
int i_xing = i_peek;
int i_skip;
if( MPGA_VERSION( header ) == 0 )
i_skip = MPGA_MODE( header ) != 3 ? 36 : 21;
else
i_skip = MPGA_MODE( header ) != 3 ? 21 : 13;
if( i_skip + 8 >= i_xing || memcmp( &p_xing[i_skip], "Xing", 4 ) )
return VLC_SUCCESS;
const uint32_t i_flags = GetDWBE( &p_xing[i_skip+4] );
MpgaXingSkip( &p_xing, &i_xing, i_skip + 8 );
if( i_flags&0x01 )
p_sys->xing.i_frames = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
if( i_flags&0x02 )
p_sys->xing.i_bytes = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
if( i_flags&0x04 ) /* TODO Support XING TOC to improve seeking accuracy */
MpgaXingSkip( &p_xing, &i_xing, 100 );
if( i_flags&0x08 )
{
/* FIXME: doesn't return the right bitrage average, at least
with some MP3's */
p_sys->xing.i_bitrate_avg = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
msg_Dbg( p_demux, "xing vbr value present (%d)",
p_sys->xing.i_bitrate_avg );
}
if( p_sys->xing.i_frames > 0 && p_sys->xing.i_bytes > 0 )
{
p_sys->xing.i_frame_samples = MpgaGetFrameSamples( header );
msg_Dbg( p_demux, "xing frames&bytes value present "
"(%d bytes, %d frames, %d samples/frame)",
p_sys->xing.i_bytes, p_sys->xing.i_frames,
p_sys->xing.i_frame_samples );
}
if( i_xing >= 20 && memcmp( p_xing, "LAME", 4 ) == 0)
{
p_sys->xing.b_lame = true;
lame_extra_t *p_lame = &p_sys->xing.lame;
memcpy( p_lame->psz_version, p_xing, 9 );
p_lame->psz_version[9] = '\0';
MpgaXingSkip( &p_xing, &i_xing, 9 );
MpgaXingSkip( &p_xing, &i_xing, 1 ); /* rev_method */
p_lame->i_lowpass = (*p_xing) * 100;
MpgaXingSkip( &p_xing, &i_xing, 1 );
uint32_t peak = MpgaXingGetDWBE( &p_xing, &i_xing, 0 );
uint16_t track = MpgaXingGetWBE( &p_xing, &i_xing, 0 );
uint16_t album = MpgaXingGetWBE( &p_xing, &i_xing, 0 );
p_sys->rgf_replay_peak[AUDIO_REPLAY_GAIN_TRACK] = (float) MpgaXingLameConvertPeak( peak );
p_sys->rgf_replay_gain[AUDIO_REPLAY_GAIN_TRACK] = (float) MpgaXingLameConvertGain( track );
p_sys->rgf_replay_gain[AUDIO_REPLAY_GAIN_ALBUM] = (float) MpgaXingLameConvertGain( album );
MpgaXingSkip( &p_xing, &i_xing, 1 ); /* flags */
}
return VLC_SUCCESS;
}
/*****************************************************************************
* AAC
*****************************************************************************/
static int AacProbe( demux_t *p_demux, int64_t *pi_offset )
{
bool b_forced;
bool b_forced_demux;
int64_t i_offset;
const uint8_t *p_peek;
b_forced = demux_IsPathExtension( p_demux, ".aac" ) ||
demux_IsPathExtension( p_demux, ".aacp" );
b_forced_demux = demux_IsForced( p_demux, "m4a" ) ||
demux_IsForced( p_demux, "aac" ) ||
demux_IsForced( p_demux, "mp4a" );
if( !b_forced_demux && !b_forced )
return VLC_EGENERIC;
i_offset = vlc_stream_Tell( p_demux->s );
/* peek the begining (10 is for adts header) */
if( vlc_stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
{
msg_Dbg( p_demux, "cannot peek" );
return VLC_EGENERIC;
}
if( !strncmp( (char *)p_peek, "ADIF", 4 ) )
{
msg_Err( p_demux, "ADIF file. Not yet supported. (Please report)" );
return VLC_EGENERIC;
}
*pi_offset = i_offset;
return VLC_SUCCESS;
}
static int AacInit( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
p_sys->i_packet_size = 4096;
p_sys->i_original = VLC_FOURCC('H','E','A','D');
return VLC_SUCCESS;
}
/*****************************************************************************
* A52
*****************************************************************************/
static int A52CheckSync( const uint8_t *p_peek, bool *p_big_endian, int *pi_samples, bool b_eac3 )
{
vlc_a52_header_t header;
uint8_t p_tmp[VLC_A52_HEADER_SIZE];
*p_big_endian = p_peek[0] == 0x0b && p_peek[1] == 0x77;
if( !*p_big_endian )
{
swab( p_peek, p_tmp, VLC_A52_HEADER_SIZE );
p_peek = p_tmp;
}
if( vlc_a52_header_Parse( &header, p_peek, VLC_A52_HEADER_SIZE ) )
return VLC_EGENERIC;
if( !header.b_eac3 != !b_eac3 )
return VLC_EGENERIC;
if( pi_samples )
*pi_samples = header.i_samples;
return header.i_size;
}
static int EA52CheckSyncProbe( const uint8_t *p_peek, int *pi_samples )
{
bool b_dummy;
return A52CheckSync( p_peek, &b_dummy, pi_samples, true );
}
static int EA52Probe( demux_t *p_demux, int64_t *pi_offset )
{
const char *ppsz_name[] = { "eac3", NULL };
const int pi_wav[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_A52, WAVE_FORMAT_UNKNOWN };
return GenericProbe( p_demux, pi_offset, ppsz_name, EA52CheckSyncProbe,
VLC_A52_HEADER_SIZE, pi_wav, GenericFormatCheck );
}
static int A52CheckSyncProbe( const uint8_t *p_peek, int *pi_samples )
{
bool b_dummy;
return A52CheckSync( p_peek, &b_dummy, pi_samples, false );
}
static int A52Probe( demux_t *p_demux, int64_t *pi_offset )
{
const char *ppsz_name[] = { "a52", "ac3", NULL };
const int pi_wav[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_A52, WAVE_FORMAT_UNKNOWN };
return GenericProbe( p_demux, pi_offset, ppsz_name, A52CheckSyncProbe,
VLC_A52_HEADER_SIZE, pi_wav, GenericFormatCheck );
}
static int A52Init( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
p_sys->b_big_endian = false;
p_sys->i_packet_size = 1024;
const uint8_t *p_peek;
/* peek the begining */
if( vlc_stream_Peek( p_demux->s, &p_peek, VLC_A52_HEADER_SIZE ) >= VLC_A52_HEADER_SIZE )
{
A52CheckSync( p_peek, &p_sys->b_big_endian, NULL, true );
}
return VLC_SUCCESS;
}
/*****************************************************************************
* DTS
*****************************************************************************/
static int DtsCheckSync( const uint8_t *p_peek, int *pi_samples )
{
VLC_UNUSED(pi_samples);
vlc_dts_header_t dts;
if( vlc_dts_header_Parse( &dts, p_peek, VLC_DTS_HEADER_SIZE ) == VLC_SUCCESS
&& dts.i_frame_size > 0 && dts.i_frame_size <= 8192 )
{
if( pi_samples )
*pi_samples = dts.i_frame_length;
return dts.i_frame_size;
}
else
return VLC_EGENERIC;
}
static int DtsProbe( demux_t *p_demux, int64_t *pi_offset )
{
const char *ppsz_name[] = { "dts", NULL };
const int pi_wav[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_DTS, WAVE_FORMAT_UNKNOWN };
return GenericProbe( p_demux, pi_offset, ppsz_name, DtsCheckSync,
VLC_DTS_HEADER_SIZE, pi_wav, NULL );
}
static int DtsInit( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
p_sys->i_packet_size = 16384;
return VLC_SUCCESS;
}
/*****************************************************************************
* MLP
*****************************************************************************/
static int MlpCheckSync( const uint8_t *p_peek, int *pi_samples )
{
if( p_peek[4+0] != 0xf8 || p_peek[4+1] != 0x72 || p_peek[4+2] != 0x6f )
return -1;
if( p_peek[4+3] != 0xbb )
return -1;
/* TODO checksum and real size for robustness */
VLC_UNUSED(pi_samples);
return 0;
}
static int ThdCheckSync( const uint8_t *p_peek, int *pi_samples )
{
if( p_peek[4+0] != 0xf8 || p_peek[4+1] != 0x72 || p_peek[4+2] != 0x6f )
return -1;
if( p_peek[4+3] != 0xba )
return -1;
/* TODO checksum and real size for robustness */
VLC_UNUSED(pi_samples);
return 0;
}
static int MlpProbe( demux_t *p_demux, int64_t *pi_offset )
{
const char *ppsz_name[] = { "mlp", NULL };
const int pi_wav[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_UNKNOWN };
return GenericProbe( p_demux, pi_offset, ppsz_name, MlpCheckSync,
4+28+16*4, pi_wav, GenericFormatCheck );
}
static int ThdProbe( demux_t *p_demux, int64_t *pi_offset )
{
const char *ppsz_name[] = { "thd", NULL };
const int pi_wav[] = { WAVE_FORMAT_PCM, WAVE_FORMAT_UNKNOWN };
return GenericProbe( p_demux, pi_offset, ppsz_name, ThdCheckSync,
4+28+16*4, pi_wav, GenericFormatCheck );
}
static int MlpInit( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
p_sys->i_packet_size = 4096;
return VLC_SUCCESS;
}
/*****************************************************************************
* Video
*****************************************************************************/
static int VideoInit( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
p_sys->i_packet_size = 4096;
return VLC_SUCCESS;
}