1 /*****************************************************************************
2 * rawdv.h : raw DV helpers
3 *****************************************************************************
4 * Copyright (C) 2001-2011 the VideoLAN team
7 * Authors: Gildas Bazin <gbazin@netcourrier.com>
8 * Paul Corke <paul dot corke at datatote dot co dot uk>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 #define DV_PAL_FRAME_SIZE (12 * 150 * 80)
26 #define DV_NTSC_FRAME_SIZE (10 * 150 * 80)
29 static const uint16_t dv_audio_shuffle525[10][9] = {
30 { 0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
31 { 6, 36, 66, 26, 56, 86, 16, 46, 76 },
32 { 12, 42, 72, 2, 32, 62, 22, 52, 82 },
33 { 18, 48, 78, 8, 38, 68, 28, 58, 88 },
34 { 24, 54, 84, 14, 44, 74, 4, 34, 64 },
36 { 1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */
37 { 7, 37, 67, 27, 57, 87, 17, 47, 77 },
38 { 13, 43, 73, 3, 33, 63, 23, 53, 83 },
39 { 19, 49, 79, 9, 39, 69, 29, 59, 89 },
40 { 25, 55, 85, 15, 45, 75, 5, 35, 65 },
43 static const uint16_t dv_audio_shuffle625[12][9] = {
44 { 0, 36, 72, 26, 62, 98, 16, 52, 88}, /* 1st channel */
45 { 6, 42, 78, 32, 68, 104, 22, 58, 94},
46 { 12, 48, 84, 2, 38, 74, 28, 64, 100},
47 { 18, 54, 90, 8, 44, 80, 34, 70, 106},
48 { 24, 60, 96, 14, 50, 86, 4, 40, 76},
49 { 30, 66, 102, 20, 56, 92, 10, 46, 82},
51 { 1, 37, 73, 27, 63, 99, 17, 53, 89}, /* 2nd channel */
52 { 7, 43, 79, 33, 69, 105, 23, 59, 95},
53 { 13, 49, 85, 3, 39, 75, 29, 65, 101},
54 { 19, 55, 91, 9, 45, 81, 35, 71, 107},
55 { 25, 61, 97, 15, 51, 87, 5, 41, 77},
56 { 31, 67, 103, 21, 57, 93, 11, 47, 83},
59 static inline uint16_t dv_audio_12to16( uint16_t sample )
61 uint16_t shift, result;
63 sample = (sample < 0x800) ? sample : sample | 0xf000;
64 shift = (sample & 0xf00) >> 8;
66 if (shift < 0x2 || shift > 0xd) {
68 } else if (shift < 0x8) {
70 result = (sample - (256 * shift)) << shift;
73 result = ((sample + ((256 * shift) + 1)) << shift) - 1;
79 static void dv_get_audio_format( es_format_t *p_fmt, const uint8_t *p_aaux_src )
81 /* 12 bits non-linear will be converted to 16 bits linear */
82 es_format_Init( p_fmt, AUDIO_ES, VLC_CODEC_S16L );
84 p_fmt->audio.i_bitspersample = 16;
85 p_fmt->audio.i_channels = 2;
86 switch( (p_aaux_src[4-1] >> 3) & 0x07 )
89 p_fmt->audio.i_rate = 48000;
92 p_fmt->audio.i_rate = 44100;
96 p_fmt->audio.i_rate = 32000;
101 static inline int dv_get_audio_sample_count( const uint8_t *p_buffer, int i_dsf )
103 int i_samples = p_buffer[0] & 0x3f; /* samples in this frame - min samples */
104 switch( (p_buffer[3] >> 3) & 0x07 )
107 return i_samples + (i_dsf ? 1896 : 1580);
109 return i_samples + (i_dsf ? 1742 : 1452);
112 return i_samples + (i_dsf ? 1264 : 1053);
116 static block_t *dv_extract_audio( block_t *p_frame_block )
119 uint8_t *p_frame, *p_buf;
120 int i_audio_quant, i_samples, i_half_ch;
121 const uint16_t (*audio_shuffle)[9];
124 if( p_frame_block->i_buffer < 4 )
126 const int i_dsf = (p_frame_block->p_buffer[3] & 0x80) >> 7;
127 if( p_frame_block->i_buffer < (i_dsf ? DV_PAL_FRAME_SIZE
128 : DV_NTSC_FRAME_SIZE ) )
131 /* Beginning of AAUX pack */
132 p_buf = p_frame_block->p_buffer + 80*6+80*16*3 + 3;
133 if( *p_buf != 0x50 ) return NULL;
135 i_audio_quant = p_buf[4] & 0x07; /* 0 - 16bit, 1 - 12bit */
136 if( i_audio_quant > 1 )
139 i_samples = dv_get_audio_sample_count( &p_buf[1], i_dsf );
141 p_block = block_New( p_demux, 4 * i_samples );
143 /* for each DIF segment */
144 p_frame = p_frame_block->p_buffer;
145 audio_shuffle = i_dsf ? dv_audio_shuffle625 : dv_audio_shuffle525;
146 i_half_ch = (i_dsf ? 12 : 10)/2;
147 for( i = 0; i < (i_dsf ? 12 : 10); i++ )
149 p_frame += 6 * 80; /* skip DIF segment header */
151 if( i_audio_quant == 1 && i == i_half_ch ) break;
153 for( j = 0; j < 9; j++ )
155 for( d = 8; d < 80; d += 2 )
157 if( i_audio_quant == 0 )
159 /* 16bit quantization */
160 of = audio_shuffle[i][j] + (d - 8) / 2 *
163 if( of * 2 >= 4 * i_samples ) continue;
166 p_block->p_buffer[of*2] = p_frame[d+1];
167 p_block->p_buffer[of*2+1] = p_frame[d];
169 if( p_block->p_buffer[of*2+1] == 0x80 &&
170 p_block->p_buffer[of*2] == 0x00 )
171 p_block->p_buffer[of*2+1] = 0;
175 /* 12bit quantization */
176 uint16_t lc = (p_frame[d+0] << 4) | (p_frame[d+2] >> 4);
177 uint16_t rc = (p_frame[d+1] << 4) | (p_frame[d+2] & 0x0f);
179 lc = lc == 0x800 ? 0 : dv_audio_12to16(lc);
180 rc = rc == 0x800 ? 0 : dv_audio_12to16(rc);
182 of = audio_shuffle[i][j] + (d - 8) / 3 * (i_dsf ? 108 : 90);
183 if( of*2 >= 4 * i_samples )
185 p_block->p_buffer[of*2+0] = lc & 0xff;
186 p_block->p_buffer[of*2+1] = lc >> 8;
188 of = audio_shuffle[i + i_half_ch][j] + (d - 8) / 3 * (i_dsf ? 108 : 90);
189 if( of*2 >= 4 * i_samples )
191 p_block->p_buffer[of*2+0] = rc & 0xff;
192 p_block->p_buffer[of*2+1] = rc >> 8;
198 p_frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
202 p_block->i_pts = p_frame_block->i_pts > VLC_TS_INVALID ? p_frame_block->i_pts
203 : p_frame_block->i_dts;
204 p_block->i_dts = p_frame_block->i_dts;