rawdv.c
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上传日期:2009-03-27
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- /*****************************************************************************
- * rawdv.c : raw DV input module for vlc
- *****************************************************************************
- * Copyright (C) 2001-2004 VideoLAN
- * $Id: rawdv.c 7665 2004-05-15 10:52:56Z fenrir $
- *
- * Authors: Gildas Bazin <gbazin@netcourrier.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #include <stdlib.h> /* malloc(), free() */
- #include <vlc/vlc.h>
- #include <vlc/input.h>
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- static int Open ( vlc_object_t * );
- static void Close( vlc_object_t * );
- vlc_module_begin();
- set_description( _("raw DV demuxer") );
- set_capability( "demux2", 2 );
- set_callbacks( Open, Close );
- add_shortcut( "rawdv" );
- vlc_module_end();
- /*****************************************************************************
- A little bit of background information (copied over from libdv glossary).
- - DIF block: A block of 80 bytes. This is the basic data framing unit of the
- DVC tape format, analogous to sectors of hard disc.
- - Video Section: Each DIF sequence contains a video section, consisting of
- 135 DIF blocks, which are further subdivided into Video Segments.
- - Video Segment: A video segment consists of 5 DIF blocks, each corresponding
- to a single compressed macroblock.
- *****************************************************************************/
- /*****************************************************************************
- * Constants
- *****************************************************************************/
- #define DV_PAL_FRAME_SIZE 144000
- #define DV_NTSC_FRAME_SIZE 122000
- /*****************************************************************************
- * Definitions of structures used by this plugin
- *****************************************************************************/
- typedef struct {
- int8_t sct; /* Section type (header,subcode,aux,audio,video) */
- int8_t dsn; /* DIF sequence number (0-12) */
- int fsc; /* First (0)/Second channel (1) */
- int8_t dbn; /* DIF block number (0-134) */
- } dv_id_t;
- typedef struct {
- int dsf; /* DIF sequence flag: 525/60 (0) or 625,50 (1) */
- int8_t apt;
- int tf1;
- int8_t ap1;
- int tf2;
- int8_t ap2;
- int tf3;
- int8_t ap3;
- } dv_header_t;
- struct demux_sys_t
- {
- int frame_size;
- es_out_id_t *p_es_video;
- es_format_t fmt_video;
- es_out_id_t *p_es_audio;
- es_format_t fmt_audio;
- int i_dsf;
- double f_rate;
- int i_bitrate;
- /* program clock reference (in units of 90kHz) */
- mtime_t i_pcr;
- };
- /*****************************************************************************
- * Local prototypes
- *****************************************************************************/
- static int Demux( demux_t * );
- static int Control( demux_t *, int i_query, va_list args );
- static block_t *dv_extract_audio( demux_t *p_demux,
- block_t* p_frame_block );
- /*****************************************************************************
- * Open: initializes raw DV demux structures
- *****************************************************************************/
- static int Open( vlc_object_t * p_this )
- {
- demux_t *p_demux = (demux_t*)p_this;
- demux_sys_t *p_sys;
- byte_t *p_peek, *p_peek_backup;
- uint32_t i_dword;
- dv_header_t dv_header;
- dv_id_t dv_id;
- char *psz_ext;
- /* It isn't easy to recognize a raw DV stream. The chances that we'll
- * mistake a stream from another type for a raw DV stream are too high, so
- * we'll rely on the file extension to trigger this demux. Alternatively,
- * it is possible to force this demux. */
- /* Check for DV file extension */
- psz_ext = strrchr( p_demux->psz_path, '.' );
- if( ( !psz_ext || strcasecmp( psz_ext, ".dv") ) &&
- strcmp(p_demux->psz_demux, "rawdv") )
- {
- return VLC_EGENERIC;
- }
- if( stream_Peek( p_demux->s, &p_peek, DV_PAL_FRAME_SIZE ) <
- DV_NTSC_FRAME_SIZE )
- {
- /* Stream too short ... */
- msg_Err( p_demux, "cannot peek()" );
- return VLC_EGENERIC;
- }
- p_peek_backup = p_peek;
- /* fill in the dv_id_t structure */
- i_dword = GetDWBE( p_peek ); p_peek += 4;
- dv_id.sct = i_dword >> (32 - 3);
- i_dword <<= 8;
- dv_id.dsn = i_dword >> (32 - 4);
- i_dword <<= 4;
- dv_id.fsc = i_dword >> (32 - 1);
- i_dword <<= 4;
- dv_id.dbn = i_dword >> (32 - 8);
- i_dword <<= 8;
- if( dv_id.sct != 0 )
- {
- msg_Warn( p_demux, "not a raw DV stream header" );
- return VLC_EGENERIC;
- }
- /* fill in the dv_header_t structure */
- dv_header.dsf = i_dword >> (32 - 1);
- i_dword <<= 1;
- if( i_dword >> (32 - 1) ) /* incorrect bit */
- {
- msg_Warn( p_demux, "incorrect bit" );
- return VLC_EGENERIC;
- }
- i_dword = GetDWBE( p_peek ); p_peek += 4;
- i_dword <<= 5;
- dv_header.apt = i_dword >> (32 - 3);
- i_dword <<= 3;
- dv_header.tf1 = i_dword >> (32 - 1);
- i_dword <<= 5;
- dv_header.ap1 = i_dword >> (32 - 3);
- i_dword <<= 3;
- dv_header.tf2 = i_dword >> (32 - 1);
- i_dword <<= 5;
- dv_header.ap2 = i_dword >> (32 - 3);
- i_dword <<= 3;
- dv_header.tf3 = i_dword >> (32 - 1);
- i_dword <<= 5;
- dv_header.ap3 = i_dword >> (32 - 3);
- p_peek += 72; /* skip rest of DIF block */
- /* Set p_input field */
- p_demux->pf_demux = Demux;
- p_demux->pf_control = Control;
- p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
- p_sys->i_dsf = dv_header.dsf;
- p_sys->frame_size = dv_header.dsf ? 12 * 150 * 80 : 10 * 150 * 80;
- p_sys->f_rate = dv_header.dsf ? 25 : 29.97;
- p_sys->i_pcr = 1;
- p_sys->p_es_video = NULL;
- p_sys->p_es_audio = NULL;
- p_sys->i_bitrate = 0;
- es_format_Init( &p_sys->fmt_video, VIDEO_ES, VLC_FOURCC('d','v','s','d') );
- p_sys->fmt_video.video.i_width = 720;
- p_sys->fmt_video.video.i_height= dv_header.dsf ? 576 : 480;;
- /* FIXME FIXME */
- #if 0
- /* necessary because input_SplitBuffer() will only get
- * INPUT_DEFAULT_BUFSIZE bytes at a time. */
- p_input->i_bufsize = p_sys->frame_size;
- #endif
- p_sys->p_es_video = es_out_Add( p_demux->out, &p_sys->fmt_video );
- /* Audio stuff */
- p_peek = p_peek_backup + 80*6+80*16*3 + 3; /* beginning of AAUX pack */
- if( *p_peek == 0x50 )
- {
- es_format_Init( &p_sys->fmt_audio, AUDIO_ES,
- VLC_FOURCC('a','r','a','w') );
- p_sys->fmt_audio.audio.i_channels = 2;
- switch( (p_peek[4] >> 3) & 0x07 )
- {
- case 0:
- p_sys->fmt_audio.audio.i_rate = 48000;
- break;
- case 1:
- p_sys->fmt_audio.audio.i_rate = 44100;
- break;
- case 2:
- default:
- p_sys->fmt_audio.audio.i_rate = 32000;
- break;
- }
- /* 12 bits non-linear will be converted to 16 bits linear */
- p_sys->fmt_audio.audio.i_bitspersample = 16;
- p_sys->p_es_audio = es_out_Add( p_demux->out, &p_sys->fmt_audio );
- }
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Close: frees unused data
- *****************************************************************************/
- static void Close( vlc_object_t *p_this )
- {
- demux_t *p_demux = (demux_t*)p_this;
- demux_sys_t *p_sys = p_demux->p_sys;
- free( p_sys );
- }
- /*****************************************************************************
- * Demux: reads and demuxes data packets
- *****************************************************************************
- * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
- *****************************************************************************/
- static int Demux( demux_t *p_demux )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- block_t *p_block;
- vlc_bool_t b_audio = VLC_FALSE;
- /* Call the pace control */
- es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
- if( ( p_block = stream_Block( p_demux->s, p_sys->frame_size ) ) == NULL )
- {
- /* EOF */
- return 0;
- }
- if( p_sys->p_es_audio )
- {
- es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
- p_sys->p_es_audio, &b_audio );
- }
- p_block->i_dts =
- p_block->i_pts = p_sys->i_pcr;
- if( b_audio )
- {
- block_t *p_audio_block = dv_extract_audio( p_demux, p_block );
- if( p_audio_block )
- {
- p_audio_block->i_pts =
- p_audio_block->i_dts = p_sys->i_pcr;
- es_out_Send( p_demux->out, p_sys->p_es_audio, p_audio_block );
- }
- }
- es_out_Send( p_demux->out, p_sys->p_es_video, p_block );
- p_sys->i_pcr += ( I64C(1000000) / p_sys->f_rate );
- return 1;
- }
- /*****************************************************************************
- * Control:
- *****************************************************************************/
- static int Control( demux_t *p_demux, int i_query, va_list args )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- /* XXX: DEMUX_SET_TIME is precise here */
- return demux2_vaControlHelper( p_demux->s,
- 0, -1,
- p_sys->frame_size * p_sys->f_rate * 8,
- p_sys->frame_size, i_query, args );
- }
- static const uint16_t dv_audio_shuffle525[10][9] = {
- { 0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
- { 6, 36, 66, 26, 56, 86, 16, 46, 76 },
- { 12, 42, 72, 2, 32, 62, 22, 52, 82 },
- { 18, 48, 78, 8, 38, 68, 28, 58, 88 },
- { 24, 54, 84, 14, 44, 74, 4, 34, 64 },
- { 1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */
- { 7, 37, 67, 27, 57, 87, 17, 47, 77 },
- { 13, 43, 73, 3, 33, 63, 23, 53, 83 },
- { 19, 49, 79, 9, 39, 69, 29, 59, 89 },
- { 25, 55, 85, 15, 45, 75, 5, 35, 65 },
- };
- static const uint16_t dv_audio_shuffle625[12][9] = {
- { 0, 36, 72, 26, 62, 98, 16, 52, 88}, /* 1st channel */
- { 6, 42, 78, 32, 68, 104, 22, 58, 94},
- { 12, 48, 84, 2, 38, 74, 28, 64, 100},
- { 18, 54, 90, 8, 44, 80, 34, 70, 106},
- { 24, 60, 96, 14, 50, 86, 4, 40, 76},
- { 30, 66, 102, 20, 56, 92, 10, 46, 82},
- { 1, 37, 73, 27, 63, 99, 17, 53, 89}, /* 2nd channel */
- { 7, 43, 79, 33, 69, 105, 23, 59, 95},
- { 13, 49, 85, 3, 39, 75, 29, 65, 101},
- { 19, 55, 91, 9, 45, 81, 35, 71, 107},
- { 25, 61, 97, 15, 51, 87, 5, 41, 77},
- { 31, 67, 103, 21, 57, 93, 11, 47, 83},
- };
- static inline uint16_t dv_audio_12to16( uint16_t sample )
- {
- uint16_t shift, result;
- sample = (sample < 0x800) ? sample : sample | 0xf000;
- shift = (sample & 0xf00) >> 8;
- if (shift < 0x2 || shift > 0xd) {
- result = sample;
- } else if (shift < 0x8) {
- shift--;
- result = (sample - (256 * shift)) << shift;
- } else {
- shift = 0xe - shift;
- result = ((sample + ((256 * shift) + 1)) << shift) - 1;
- }
- return result;
- }
- static block_t *dv_extract_audio( demux_t *p_demux,
- block_t* p_frame_block )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- block_t *p_block;
- uint8_t *p_frame, *p_buf;
- int i_audio_quant, i_samples, i_size, i_half_ch;
- const uint16_t (*audio_shuffle)[9];
- int i, j, d, of;
- uint16_t lc;
- /* Beginning of AAUX pack */
- p_buf = p_frame_block->p_buffer + 80*6+80*16*3 + 3;
- if( *p_buf != 0x50 ) return NULL;
- i_audio_quant = p_buf[4] & 0x07; /* 0 - 16bit, 1 - 12bit */
- if( i_audio_quant > 1 )
- {
- msg_Dbg( p_demux, "Unsupported quantization for DV audio");
- return NULL;
- }
- i_samples = p_buf[1] & 0x3f; /* samples in this frame - min samples */
- switch( (p_buf[4] >> 3) & 0x07 )
- {
- case 0:
- i_size = p_sys->i_dsf ? 1896 : 1580;
- break;
- case 1:
- i_size = p_sys->i_dsf ? 1742 : 1452;
- break;
- case 2:
- default:
- i_size = p_sys->i_dsf ? 1264 : 1053;
- break;
- }
- i_size = (i_size + i_samples) * 4; /* 2ch, 2bytes */
- p_block = block_New( p_demux, i_size );
- /* for each DIF segment */
- p_frame = p_frame_block->p_buffer;
- audio_shuffle = p_sys->i_dsf ? dv_audio_shuffle625 : dv_audio_shuffle525;
- i_half_ch = (p_sys->i_dsf ? 12 : 10)/2;
- for( i = 0; i < (p_sys->i_dsf ? 12 : 10); i++ )
- {
- p_frame += 6 * 80; /* skip DIF segment header */
- if( i_audio_quant == 1 && i == i_half_ch ) break;
- for( j = 0; j < 9; j++ )
- {
- for( d = 8; d < 80; d += 2 )
- {
- if( i_audio_quant == 0 )
- {
- /* 16bit quantization */
- of = audio_shuffle[i][j] + (d - 8) / 2 *
- (p_sys->i_dsf ? 108 : 90);
- if( of * 2 >= i_size ) continue;
- /* big endian */
- p_block->p_buffer[of*2] = p_frame[d+1];
- p_block->p_buffer[of*2+1] = p_frame[d];
- if( p_block->p_buffer[of*2+1] == 0x80 &&
- p_block->p_buffer[of*2] == 0x00 )
- p_block->p_buffer[of*2+1] = 0;
- }
- else
- {
- /* 12bit quantization */
- lc = ((uint16_t)p_frame[d] << 4) |
- ((uint16_t)p_frame[d+2] >> 4);
- lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
- of = audio_shuffle[i][j] + (d - 8) / 3 *
- (p_sys->i_dsf ? 108 : 90);
- if( of*2 >= i_size ) continue;
- /* big endian */
- p_block->p_buffer[of*2] = lc & 0xff;
- p_block->p_buffer[of*2+1] = lc >> 8;
- ++d;
- }
- }
- p_frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
- }
- }
- return p_block;
- }