2 * dtsdec.c : free DTS Coherent Acoustics stream decoder.
3 * Copyright (C) 2004 Benjamin Zores <ben@geexbox.org>
5 * This file is part of libavcodec.
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #ifdef HAVE_AV_CONFIG_H
23 #undef HAVE_AV_CONFIG_H
28 #include "dts_internal.h"
35 #define INBUF_SIZE 4096
36 #define BUFFER_SIZE 4096
37 #define HEADER_SIZE 14
40 #define CONVERT_LEVEL (1 << 26)
41 #define CONVERT_BIAS 0
43 #define CONVERT_LEVEL 1
44 #define CONVERT_BIAS 384
48 pre_calc_cosmod (dts_state_t * state)
52 for (j=0,k=0;k<16;k++)
54 state->cos_mod[j++] = cos((2*i+1)*(2*k+1)*M_PI/64);
58 state->cos_mod[j++] = cos((i)*(2*k+1)*M_PI/32);
61 state->cos_mod[j++] = 0.25/(2*cos((2*k+1)*M_PI/128));
64 state->cos_mod[j++] = -0.25/(2.0*sin((2*k+1)*M_PI/128));
68 int16_t convert (int32_t i)
75 return (i > 32767) ? 32767 : ((i < -32768) ? -32768 : i);
79 convert2s16_2 (sample_t * _f, int16_t * s16)
82 int32_t * f = (int32_t *) _f;
84 for (i = 0; i < 256; i++)
86 s16[2*i] = convert (f[i]);
87 s16[2*i+1] = convert (f[i+256]);
92 convert2s16_4 (sample_t * _f, int16_t * s16)
95 int32_t * f = (int32_t *) _f;
97 for (i = 0; i < 256; i++)
99 s16[4*i] = convert (f[i]);
100 s16[4*i+1] = convert (f[i+256]);
101 s16[4*i+2] = convert (f[i+512]);
102 s16[4*i+3] = convert (f[i+768]);
107 convert2s16_5 (sample_t * _f, int16_t * s16)
110 int32_t * f = (int32_t *) _f;
112 for (i = 0; i < 256; i++)
114 s16[5*i] = convert (f[i]);
115 s16[5*i+1] = convert (f[i+256]);
116 s16[5*i+2] = convert (f[i+512]);
117 s16[5*i+3] = convert (f[i+768]);
118 s16[5*i+4] = convert (f[i+1024]);
123 convert2s16_multi (sample_t * _f, int16_t * s16, int flags)
126 int32_t * f = (int32_t *) _f;
131 for (i = 0; i < 256; i++)
133 s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
134 s16[5*i+4] = convert (f[i]);
140 convert2s16_2 (_f, s16);
143 for (i = 0; i < 256; i++)
145 s16[5*i] = convert (f[i]);
146 s16[5*i+1] = convert (f[i+512]);
147 s16[5*i+2] = s16[5*i+3] = 0;
148 s16[5*i+4] = convert (f[i+256]);
152 convert2s16_4 (_f, s16);
155 convert2s16_5 (_f, s16);
157 case DTS_MONO | DTS_LFE:
158 for (i = 0; i < 256; i++)
160 s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
161 s16[6*i+4] = convert (f[i+256]);
162 s16[6*i+5] = convert (f[i]);
165 case DTS_CHANNEL | DTS_LFE:
166 case DTS_STEREO | DTS_LFE:
167 case DTS_DOLBY | DTS_LFE:
168 for (i = 0; i < 256; i++)
170 s16[6*i] = convert (f[i+256]);
171 s16[6*i+1] = convert (f[i+512]);
172 s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
173 s16[6*i+5] = convert (f[i]);
176 case DTS_3F | DTS_LFE:
177 for (i = 0; i < 256; i++)
179 s16[6*i] = convert (f[i+256]);
180 s16[6*i+1] = convert (f[i+768]);
181 s16[6*i+2] = s16[6*i+3] = 0;
182 s16[6*i+4] = convert (f[i+512]);
183 s16[6*i+5] = convert (f[i]);
186 case DTS_2F2R | DTS_LFE:
187 for (i = 0; i < 256; i++)
189 s16[6*i] = convert (f[i+256]);
190 s16[6*i+1] = convert (f[i+512]);
191 s16[6*i+2] = convert (f[i+768]);
192 s16[6*i+3] = convert (f[i+1024]);
194 s16[6*i+5] = convert (f[i]);
197 case DTS_3F2R | DTS_LFE:
198 for (i = 0; i < 256; i++)
200 s16[6*i] = convert (f[i+256]);
201 s16[6*i+1] = convert (f[i+768]);
202 s16[6*i+2] = convert (f[i+1024]);
203 s16[6*i+3] = convert (f[i+1280]);
204 s16[6*i+4] = convert (f[i+512]);
205 s16[6*i+5] = convert (f[i]);
212 channels_multi (int flags)
216 else if (flags & 1) /* center channel */
218 else if ((flags & DTS_CHANNEL_MASK) == DTS_2F2R)
225 dts_decode_frame (AVCodecContext *avctx, void *data, int *data_size,
226 uint8_t *buff, int buff_size)
228 uint8_t * start = buff;
229 uint8_t * end = buff + buff_size;
232 static uint8_t buf[BUFFER_SIZE];
233 static uint8_t * bufptr = buf;
234 static uint8_t * bufpos = buf + HEADER_SIZE;
236 static int sample_rate;
237 static int frame_length;
241 dts_state_t *state = avctx->priv_data;
248 if (len > bufpos - bufptr)
249 len = bufpos - bufptr;
250 memcpy (bufptr, start, len);
253 if (bufptr == bufpos)
255 if (bufpos == buf + HEADER_SIZE)
259 length = dts_syncinfo (state, buf, &flags, &sample_rate,
260 &bit_rate, &frame_length);
263 av_log (NULL, AV_LOG_INFO, "skip\n");
264 for (bufptr = buf; bufptr < buf + HEADER_SIZE-1; bufptr++)
265 bufptr[0] = bufptr[1];
268 bufpos = buf + length;
276 flags = 2; /* ???????????? */
277 level = CONVERT_LEVEL;
280 flags |= DTS_ADJUST_LEVEL;
281 if (dts_frame (state, buf, &flags, &level, bias))
283 for (i = 0; i < dts_blocks_num (state); i++)
285 if (dts_block (state))
289 chans = channels_multi (flags);
290 convert2s16_multi (dts_samples (state), data,
291 flags & (DTS_CHANNEL_MASK | DTS_LFE));
293 data += 256 * sizeof (int16_t) * chans;
294 *data_size += 256 * sizeof (int16_t) * chans;
298 bufpos = buf + HEADER_SIZE;
301 av_log (NULL, AV_LOG_ERROR, "error\n");
303 bufpos = buf + HEADER_SIZE;
312 dts_decode_init (AVCodecContext *avctx)
317 state = avctx->priv_data;
318 memset (state, 0, sizeof (dts_state_t));
320 state->samples = (sample_t *) memalign (16, 256 * 12 * sizeof (sample_t));
321 if (state->samples == NULL)
324 for (i = 0; i < 256 * 12; i++)
325 state->samples[i] = 0;
327 /* Pre-calculate cosine modulation coefficients */
328 pre_calc_cosmod (state);
329 state->downmixed = 1;
335 dts_decode_end (AVCodecContext *s)
340 AVCodec dts_decoder = {
344 sizeof (dts_state_t),