2 * dtsdec.c : free DTS Coherent Acoustics stream decoder.
3 * Copyright (C) 2004 Benjamin Zores <ben@geexbox.org>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * FFmpeg 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
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #ifdef HAVE_AV_CONFIG_H
23 #undef HAVE_AV_CONFIG_H
36 #define BUFFER_SIZE 18726
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 int16_t convert (int32_t i)
55 return (i > 32767) ? 32767 : ((i < -32768) ? -32768 : i);
59 convert2s16_2 (sample_t * _f, int16_t * s16)
62 int32_t * f = (int32_t *) _f;
64 for (i = 0; i < 256; i++)
66 s16[2*i] = convert (f[i]);
67 s16[2*i+1] = convert (f[i+256]);
72 convert2s16_4 (sample_t * _f, int16_t * s16)
75 int32_t * f = (int32_t *) _f;
77 for (i = 0; i < 256; i++)
79 s16[4*i] = convert (f[i]);
80 s16[4*i+1] = convert (f[i+256]);
81 s16[4*i+2] = convert (f[i+512]);
82 s16[4*i+3] = convert (f[i+768]);
87 convert2s16_5 (sample_t * _f, int16_t * s16)
90 int32_t * f = (int32_t *) _f;
92 for (i = 0; i < 256; i++)
94 s16[5*i] = convert (f[i]);
95 s16[5*i+1] = convert (f[i+256]);
96 s16[5*i+2] = convert (f[i+512]);
97 s16[5*i+3] = convert (f[i+768]);
98 s16[5*i+4] = convert (f[i+1024]);
103 convert2s16_multi (sample_t * _f, int16_t * s16, int flags)
106 int32_t * f = (int32_t *) _f;
111 for (i = 0; i < 256; i++)
113 s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
114 s16[5*i+4] = convert (f[i]);
120 convert2s16_2 (_f, s16);
123 for (i = 0; i < 256; i++)
125 s16[5*i] = convert (f[i]);
126 s16[5*i+1] = convert (f[i+512]);
127 s16[5*i+2] = s16[5*i+3] = 0;
128 s16[5*i+4] = convert (f[i+256]);
132 convert2s16_4 (_f, s16);
135 convert2s16_5 (_f, s16);
137 case DTS_MONO | DTS_LFE:
138 for (i = 0; i < 256; i++)
140 s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
141 s16[6*i+4] = convert (f[i+256]);
142 s16[6*i+5] = convert (f[i]);
145 case DTS_CHANNEL | DTS_LFE:
146 case DTS_STEREO | DTS_LFE:
147 case DTS_DOLBY | DTS_LFE:
148 for (i = 0; i < 256; i++)
150 s16[6*i] = convert (f[i+256]);
151 s16[6*i+1] = convert (f[i+512]);
152 s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
153 s16[6*i+5] = convert (f[i]);
156 case DTS_3F | DTS_LFE:
157 for (i = 0; i < 256; i++)
159 s16[6*i] = convert (f[i+256]);
160 s16[6*i+1] = convert (f[i+768]);
161 s16[6*i+2] = s16[6*i+3] = 0;
162 s16[6*i+4] = convert (f[i+512]);
163 s16[6*i+5] = convert (f[i]);
166 case DTS_2F2R | DTS_LFE:
167 for (i = 0; i < 256; i++)
169 s16[6*i] = convert (f[i+256]);
170 s16[6*i+1] = convert (f[i+512]);
171 s16[6*i+2] = convert (f[i+768]);
172 s16[6*i+3] = convert (f[i+1024]);
174 s16[6*i+5] = convert (f[i]);
177 case DTS_3F2R | DTS_LFE:
178 for (i = 0; i < 256; i++)
180 s16[6*i] = convert (f[i+256]);
181 s16[6*i+1] = convert (f[i+768]);
182 s16[6*i+2] = convert (f[i+1024]);
183 s16[6*i+3] = convert (f[i+1280]);
184 s16[6*i+4] = convert (f[i+512]);
185 s16[6*i+5] = convert (f[i]);
192 channels_multi (int flags)
196 else if (flags & 1) /* center channel */
198 else if ((flags & DTS_CHANNEL_MASK) == DTS_2F2R)
205 dts_decode_frame (AVCodecContext *avctx, void *data, int *data_size,
206 uint8_t *buff, int buff_size)
208 uint8_t * start = buff;
209 uint8_t * end = buff + buff_size;
210 static uint8_t buf[BUFFER_SIZE];
211 static uint8_t * bufptr = buf;
212 static uint8_t * bufpos = buf + HEADER_SIZE;
214 static int sample_rate;
215 static int frame_length;
219 dts_state_t *state = avctx->priv_data;
228 if (len > bufpos - bufptr)
229 len = bufpos - bufptr;
230 memcpy (bufptr, start, len);
233 if (bufptr != bufpos)
235 if (bufpos != buf + HEADER_SIZE)
241 length = dts_syncinfo (state, buf, &flags, &sample_rate,
242 &bit_rate, &frame_length);
245 av_log (NULL, AV_LOG_INFO, "skip\n");
246 for (bufptr = buf; bufptr < buf + HEADER_SIZE-1; bufptr++)
247 bufptr[0] = bufptr[1];
250 bufpos = buf + length;
259 flags = 2; /* ???????????? */
260 level = CONVERT_LEVEL;
263 flags |= DTS_ADJUST_LEVEL;
264 if (dts_frame (state, buf, &flags, &level, bias))
266 avctx->sample_rate = sample_rate;
267 avctx->channels = channels_multi (flags);
268 avctx->bit_rate = bit_rate;
269 for (i = 0; i < dts_blocks_num (state); i++)
271 if (dts_block (state))
275 chans = channels_multi (flags);
276 convert2s16_multi (dts_samples (state), data,
277 flags & (DTS_CHANNEL_MASK | DTS_LFE));
279 data += 256 * sizeof (int16_t) * chans;
280 *data_size += 256 * sizeof (int16_t) * chans;
284 bufpos = buf + HEADER_SIZE;
287 av_log (NULL, AV_LOG_ERROR, "error\n");
289 bufpos = buf + HEADER_SIZE;
296 dts_decode_init (AVCodecContext *avctx)
298 avctx->priv_data = dts_init (0);
299 if (avctx->priv_data == NULL)
306 dts_decode_end (AVCodecContext *s)
311 AVCodec dts_decoder = {
315 sizeof (dts_state_t *),