From be3721902bdd223479625324c8d69fe51691187b Mon Sep 17 00:00:00 2001 From: Laurent Aimar Date: Fri, 28 Nov 2008 21:31:42 +0100 Subject: [PATCH] Added MLP packetizer with TrueHD support (AC3 frame removed). --- modules/packetizer/Modules.am | 4 +- modules/packetizer/mlp.c | 552 ++++++++++++++++++++++++++++++++++ 2 files changed, 555 insertions(+), 1 deletion(-) create mode 100644 modules/packetizer/mlp.c diff --git a/modules/packetizer/Modules.am b/modules/packetizer/Modules.am index 7aadef32d7..15acce907f 100644 --- a/modules/packetizer/Modules.am +++ b/modules/packetizer/Modules.am @@ -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 index 0000000000..2a308498e7 --- /dev/null +++ b/modules/packetizer/mlp.c @@ -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 +#include +#include +#include +#include +#include + +/***************************************************************************** + * 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_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 ); +} + -- 2.39.5