Added MLP packetizer with TrueHD support (AC3 frame removed).
authorLaurent Aimar <fenrir@videolan.org>
Fri, 28 Nov 2008 20:31:42 +0000 (21:31 +0100)
committerLaurent Aimar <fenrir@videolan.org>
Sat, 29 Nov 2008 09:46:22 +0000 (10:46 +0100)
modules/packetizer/Modules.am
modules/packetizer/mlp.c [new file with mode: 0644]

index 7aadef3..15acce9 100644 (file)
@@ -4,13 +4,15 @@ SOURCES_packetizer_mpeg4video = mpeg4video.c
 SOURCES_packetizer_mpeg4audio = mpeg4audio.c
 SOURCES_packetizer_h264 = h264.c
 SOURCES_packetizer_vc1 = vc1.c
+SOURCES_packetizer_mlp = mlp.c
 
 libvlc_LTLIBRARIES += \
        libpacketizer_mpegvideo_plugin.la \
        libpacketizer_mpeg4video_plugin.la \
        libpacketizer_mpeg4audio_plugin.la \
        libpacketizer_h264_plugin.la \
-       libpacketizer_vc1_plugin.la
+       libpacketizer_vc1_plugin.la \
+       libpacketizer_mlp_plugin.la
 if ENABLE_SOUT
 libvlc_LTLIBRARIES += libpacketizer_copy_plugin.la
 endif
diff --git a/modules/packetizer/mlp.c b/modules/packetizer/mlp.c
new file mode 100644 (file)
index 0000000..2a30849
--- /dev/null
@@ -0,0 +1,552 @@
+/*****************************************************************************
+ * mlp.c: packetize MLP/TrueHD audio
+ *****************************************************************************
+ * Copyright (C) 2008 Laurent Aimar
+ * $Id$
+ *
+ * Authors: Laurent Aimar < fenrir _AT videolan _DOT_ org >
+ *
+ * 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  Open ( vlc_object_t * );
+static void Close( vlc_object_t * );
+
+vlc_module_begin ()
+    set_category( CAT_SOUT )
+    set_subcategory( SUBCAT_SOUT_PACKETIZER )
+    set_description( N_("MLP/TrueHD parser") )
+    set_capability( "packetizer", 50 )
+    set_callbacks( Open, Close )
+vlc_module_end ()
+
+/*****************************************************************************
+ *
+ *****************************************************************************/
+typedef struct
+{
+    int i_type;
+    int i_rate;
+    int i_channels;
+    int i_channels_conf;
+    int i_samples;
+
+    bool b_vbr;
+    int  i_bitrate;
+
+    int  i_substreams;
+
+} mlp_header_t;
+
+struct decoder_sys_t
+{
+    /*
+     * Input properties
+     */
+    int i_state;
+
+    block_bytestream_t bytestream;
+
+    /*
+     * Common properties
+     */
+    audio_date_t   end_date;
+
+    mtime_t i_pts;
+    int i_frame_size;
+
+    bool         b_mlp;
+    mlp_header_t mlp;
+};
+
+enum {
+
+    STATE_NOSYNC,
+    STATE_SYNC,
+    STATE_HEADER,
+    STATE_NEXT_SYNC,
+    STATE_GET_DATA,
+    STATE_SEND_DATA
+};
+
+#define MLP_MAX_SUBSTREAMS (16)
+#define MLP_HEADER_SYNC (28)
+#define MLP_HEADER_SIZE (4 + MLP_HEADER_SYNC + 4 * MLP_MAX_SUBSTREAMS)
+
+static const uint8_t pu_start_code[3] = { 0xf8, 0x72, 0x6f };
+
+/****************************************************************************
+ * Local prototypes
+ ****************************************************************************/
+static block_t *Packetize( decoder_t *, block_t **pp_block );
+static int SyncInfo( const uint8_t *p_hdr, bool *pb_mlp, mlp_header_t *p_mlp );
+static int SyncInfoDolby( const uint8_t *p_buf );
+
+/*****************************************************************************
+ * Open: probe the decoder/packetizer and return score
+ *****************************************************************************/
+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_FOURCC('m','l','p',' ') )
+        return VLC_EGENERIC;
+
+    /* */
+    p_dec->p_sys = p_sys = malloc( sizeof(*p_sys) );
+    if( !p_sys )
+        return VLC_ENOMEM;
+
+    /* */
+    p_sys->i_state = STATE_NOSYNC;
+    aout_DateSet( &p_sys->end_date, 0 );
+
+    p_sys->bytestream = block_BytestreamInit();
+    p_sys->b_mlp = false;
+
+    /* Set output properties */
+    p_dec->fmt_out.i_cat = AUDIO_ES;
+    p_dec->fmt_out.i_codec = VLC_FOURCC('m','l','p',' ');
+    p_dec->fmt_out.audio.i_rate = 0;
+
+    /* Set callback */
+    p_dec->pf_packetize = Packetize;
+    return VLC_SUCCESS;
+}
+
+/****************************************************************************
+ * Packetize:
+ ****************************************************************************/
+static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
+{
+    decoder_sys_t *p_sys = p_dec->p_sys;
+    uint8_t p_header[MLP_HEADER_SIZE];
+    block_t *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->b_mlp = false;
+            p_sys->i_state = STATE_NOSYNC;
+            block_BytestreamFlush( &p_sys->bytestream );
+        }
+        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 );
+
+    for( ;; )
+    {
+        switch( p_sys->i_state )
+        {
+        case STATE_NOSYNC:
+            while( !block_PeekBytes( &p_sys->bytestream, p_header, MLP_HEADER_SIZE ) )
+            {
+                if( SyncInfo( p_header, &p_sys->b_mlp, &p_sys->mlp ) > 0 )
+                {
+                    p_sys->i_state = STATE_SYNC;
+                    break;
+                }
+                else if( SyncInfoDolby( p_header ) > 0 )
+                {
+                    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 a MLP header */
+            if( block_PeekBytes( &p_sys->bytestream, p_header, MLP_HEADER_SIZE ) )
+            {
+                /* Need more data */
+                return NULL;
+            }
+
+            /* Check if frame is valid and get frame info */
+            p_sys->i_frame_size = SyncInfoDolby( p_header );
+            if( p_sys->i_frame_size <= 0 )
+                p_sys->i_frame_size = SyncInfo( p_header, &p_sys->b_mlp, &p_sys->mlp );
+            if( p_sys->i_frame_size <= 0 )
+            {
+                msg_Dbg( p_dec, "emulated sync word" );
+                block_SkipByte( &p_sys->bytestream );
+                p_sys->b_mlp = false;
+                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, MLP_HEADER_SIZE ) )
+            {
+                /* Need more data */
+                return NULL;
+            }
+
+            bool b_mlp = p_sys->b_mlp;
+            mlp_header_t mlp = p_sys->mlp;
+            if( SyncInfo( p_header, &b_mlp, &mlp ) <= 0 && SyncInfoDolby( p_header ) <= 0 )
+            {
+                msg_Dbg( p_dec, "emulated sync word "
+                         "(no sync on following frame)" );
+                fprintf( stderr,"\n" );
+                p_sys->b_mlp = false;
+                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 ) )
+            {
+                /* Need more data */
+                return NULL;
+            }
+            p_sys->i_state = STATE_SEND_DATA;
+
+        case STATE_SEND_DATA:
+            /* When we reach this point we already know we have enough
+             * data available. */
+            p_out_buffer = block_New( p_dec, p_sys->i_frame_size );
+            if( !p_out_buffer )
+                return NULL;
+
+            /* Copy the whole frame into the buffer */
+            block_GetBytes( &p_sys->bytestream,
+                            p_out_buffer->p_buffer, p_out_buffer->i_buffer );
+
+            /* Just ignore (E)AC3 frames */
+            if( SyncInfoDolby( p_out_buffer->p_buffer ) > 0 )
+            {
+                block_Release( p_out_buffer );
+                p_sys->i_state = STATE_NOSYNC;
+                break;
+            }
+
+            /* Setup output */
+            if( p_dec->fmt_out.audio.i_rate != p_sys->mlp.i_rate )
+            {
+                msg_Info( p_dec, "MLP channels: %d samplerate: %d",
+                          p_sys->mlp.i_channels, p_sys->mlp.i_rate );
+
+                aout_DateInit( &p_sys->end_date, p_sys->mlp.i_rate );
+                aout_DateSet( &p_sys->end_date, p_sys->i_pts );
+            }
+
+            p_dec->fmt_out.audio.i_rate     = p_sys->mlp.i_rate;
+            p_dec->fmt_out.audio.i_channels = p_sys->mlp.i_channels;
+            p_dec->fmt_out.audio.i_original_channels = p_sys->mlp.i_channels_conf;
+            p_dec->fmt_out.audio.i_physical_channels = p_sys->mlp.i_channels_conf & AOUT_CHAN_PHYSMASK;
+
+            p_out_buffer->i_pts = p_out_buffer->i_dts = aout_DateGet( &p_sys->end_date );
+
+            p_out_buffer->i_length =
+                aout_DateIncrement( &p_sys->end_date, p_sys->mlp.i_samples ) - p_out_buffer->i_pts;
+
+            /* 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;
+
+            /* So p_block doesn't get re-added several times */
+            *pp_block = block_BytestreamPop( &p_sys->bytestream );
+
+            p_sys->i_state = STATE_NOSYNC;
+
+            return p_out_buffer;
+        }
+    }
+
+    return NULL;
+}
+
+/*****************************************************************************
+ * Close:
+ *****************************************************************************/
+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 );
+}
+
+/**
+ * It parse MLP sync info.
+ *
+ * TODO handle CRC (at offset 26)
+  */
+
+static int TrueHdChannels( int i_map )
+{
+    static const uint8_t pu_thd[13] =
+    {
+         2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1
+    };
+    int i_count = 0;
+
+    for( int i = 0; i < 13; i++ )
+    {
+        if( i_map & (1<<i) )
+            i_count += pu_thd[i];
+    }
+    return i_count;
+}
+
+static int MlpParse( mlp_header_t *p_mlp, const uint8_t p_hdr[MLP_HEADER_SYNC] )
+{
+    bs_t s;
+
+    assert( !memcmp( p_hdr, pu_start_code, 3 ) );
+
+    /* TODO Checksum ? */
+
+    /* */
+    bs_init( &s, &p_hdr[3], MLP_HEADER_SYNC - 3 );
+
+    /* Stream type */
+    p_mlp->i_type = bs_read( &s, 8 );
+    int i_rate_idx1;
+
+    if( p_mlp->i_type == 0xbb )        /* MLP */
+    {
+        static const unsigned pu_channels[32] = {
+            1, 2, 3, 4, 3, 4, 5, 3, 4, 5, 4, 5, 6, 4, 5, 4,
+            5, 6, 5, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        };
+
+        bs_skip( &s, 4 + 4 );
+
+        i_rate_idx1 = bs_read( &s, 4 );
+        const int i_rate_idx2 = bs_read( &s, 4 );
+
+        bs_skip( &s, 11 );
+
+        const int i_channel_idx = bs_read( &s, 5 );
+        p_mlp->i_channels = pu_channels[i_channel_idx];
+    }
+    else if( p_mlp->i_type == 0xba )   /* True HD */
+    {
+        i_rate_idx1 = bs_read( &s, 4 );
+
+        bs_skip( &s, 8 );
+
+        const int i_channel1 = bs_read( &s, 5 );
+
+        bs_skip( &s, 2 );
+
+        const int i_channel2 = bs_read( &s, 13 );
+        if( i_channel2 )
+            p_mlp->i_channels = TrueHdChannels( i_channel2 );
+        else
+            p_mlp->i_channels = TrueHdChannels( i_channel1 );
+    }
+    else
+    {
+        return VLC_EGENERIC;
+    }
+
+    if( i_rate_idx1 == 0x0f )
+        p_mlp->i_rate = 0;
+    else
+        p_mlp->i_rate = ( ( i_rate_idx1 & 0x8 ) ? 44100 : 48000 ) << (i_rate_idx1 & 0x7);
+    p_mlp->i_channels_conf = 0; /* TODO ? */
+
+    p_mlp->i_samples = 40 << ( i_rate_idx1 & 0x07 );
+
+    bs_skip( &s, 48 );
+
+    p_mlp->b_vbr = bs_read( &s, 1 );
+    p_mlp->i_bitrate = ( bs_read( &s, 15 ) * p_mlp->i_rate + 8) / 16;
+
+    p_mlp->i_substreams = bs_read( &s, 4 );
+    bs_skip( &s, 4 + 11 * 8 );
+
+    //fprintf( stderr, "i_samples = %d channels:%d rate:%d bitsrate=%d substreams=%d\n",
+    //        p_mlp->i_samples, p_mlp->i_channels, p_mlp->i_rate, p_mlp->i_bitrate, p_mlp->i_substreams );
+    return VLC_SUCCESS;
+}
+
+static int SyncInfo( const uint8_t *p_hdr, bool *pb_mlp, mlp_header_t *p_mlp )
+{
+    /* Check major sync presence */
+    const bool b_has_sync = !memcmp( &p_hdr[4], pu_start_code, 3 );
+
+    /* Wait for a major sync */
+    if( !b_has_sync && !*pb_mlp )
+        return 0;
+
+    /* Parse major sync if present */
+    if( b_has_sync )
+    {
+        *pb_mlp = !MlpParse( p_mlp, &p_hdr[4] );
+
+        if( !*pb_mlp )
+            return 0;
+    }
+
+    /* Check parity TODO even with major sync */
+    if( 1 )
+    {
+        int i_tmp = 0 ^ p_hdr[0] ^ p_hdr[1] ^ p_hdr[2] ^ p_hdr[3];
+        const uint8_t *p = &p_hdr[4 + ( b_has_sync ? 28 : 0 )];
+
+        for( int i = 0; i < p_mlp->i_substreams; i++ )
+        {
+            i_tmp ^= *p++;
+            i_tmp ^= *p++;
+            if( p[-2] & 0x80 )
+            {
+                i_tmp ^= *p++;
+                i_tmp ^= *p++;
+            }
+        }
+        i_tmp = ( i_tmp >> 4 ) ^ i_tmp;
+
+        if( ( i_tmp & 0x0f ) != 0x0f )
+            return 0;
+    }
+
+    /* */
+    const int i_word = ( ( p_hdr[0] << 8 ) | p_hdr[1] ) & 0xfff;
+    return i_word * 2;
+}
+
+/**
+ * It returns the size of an AC3 frame (or 0 if invalid)
+ */
+static int GetAc3Size( const uint8_t *p_buf )
+{
+    static const int pi_rate[] = { 32,  40,  48,  56,  64,  80,  96, 112,
+                                128, 160, 192, 224, 256, 320, 384, 448,
+                                512, 576, 640 };
+    /* */
+    const int i_frmsizecod = p_buf[4] & 63;
+    if( i_frmsizecod >= 38 )
+        return 0;
+
+    const int bitrate = pi_rate[i_frmsizecod >> 1];
+
+    switch( p_buf[4] & 0xc0 )
+    {
+    case 0:
+        return 4 * bitrate;
+    case 0x40:
+        return 2 * (320 * bitrate / 147 + (i_frmsizecod & 1));
+    case 0x80:
+        return 6 * bitrate;
+    default:
+        return 0;
+    }
+}
+
+/**
+ * It return the size of a EAC3 frame (or 0 if invalid)
+ */
+static int GetEac3Size( const uint8_t *p_buf )
+{
+    int i_frame_size;
+    int i_bytes;
+
+    i_frame_size = ( ( p_buf[2] << 8 ) | p_buf[3] ) & 0x7ff;
+    if( i_frame_size < 2 )
+        return 0;
+    i_bytes = 2 * ( i_frame_size + 1 );
+
+    return i_bytes;
+}
+
+/**
+ * It returns the size of an AC3/EAC3 frame (or 0 if invalid)
+ */
+static int SyncInfoDolby( const uint8_t *p_buf )
+{
+    int bsid;
+
+    /* Check synword */
+    if( p_buf[0] != 0x0b || p_buf[1] != 0x77 )
+        return 0;
+
+    /* Check bsid */
+    bsid = p_buf[5] >> 3;
+    if( bsid > 16 )
+        return 0;
+
+    if( bsid <= 10 )
+        return GetAc3Size( p_buf );
+    else
+        return GetEac3Size( p_buf );
+}
+