FFmpeg  4.3.8
truespeech.c
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1 /*
2  * DSP Group TrueSpeech compatible decoder
3  * Copyright (c) 2005 Konstantin Shishkov
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg 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 2.1 of the License, or (at your option) any later version.
11  *
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 GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
23 #include "libavutil/intreadwrite.h"
24 #include "avcodec.h"
25 #include "bswapdsp.h"
26 #include "get_bits.h"
27 #include "internal.h"
28 
29 #include "truespeech_data.h"
30 /**
31  * @file
32  * TrueSpeech decoder.
33  */
34 
35 /**
36  * TrueSpeech decoder context
37  */
38 typedef struct TSContext {
40  /* input data */
42  int16_t vector[8]; ///< input vector: 5/5/4/4/4/3/3/3
43  int offset1[2]; ///< 8-bit value, used in one copying offset
44  int offset2[4]; ///< 7-bit value, encodes offsets for copying and for two-point filter
45  int pulseoff[4]; ///< 4-bit offset of pulse values block
46  int pulsepos[4]; ///< 27-bit variable, encodes 7 pulse positions
47  int pulseval[4]; ///< 7x2-bit pulse values
48  int flag; ///< 1-bit flag, shows how to choose filters
49  /* temporary data */
50  int filtbuf[146]; // some big vector used for storing filters
51  int prevfilt[8]; // filter from previous frame
52  int16_t tmp1[8]; // coefficients for adding to out
53  int16_t tmp2[8]; // coefficients for adding to out
54  int16_t tmp3[8]; // coefficients for adding to out
55  int16_t cvector[8]; // correlated input vector
56  int filtval; // gain value for one function
57  int16_t newvec[60]; // tmp vector
58  int16_t filters[32]; // filters for every subframe
59 } TSContext;
60 
62 {
63  TSContext *c = avctx->priv_data;
64 
65  if (avctx->channels != 1) {
66  avpriv_request_sample(avctx, "Channel count %d", avctx->channels);
67  return AVERROR_PATCHWELCOME;
68  }
69 
72 
74 
75  return 0;
76 }
77 
78 static void truespeech_read_frame(TSContext *dec, const uint8_t *input)
79 {
80  GetBitContext gb;
81 
82  dec->bdsp.bswap_buf((uint32_t *) dec->buffer, (const uint32_t *) input, 8);
83  init_get_bits(&gb, dec->buffer, 32 * 8);
84 
85  dec->vector[7] = ts_codebook[7][get_bits(&gb, 3)];
86  dec->vector[6] = ts_codebook[6][get_bits(&gb, 3)];
87  dec->vector[5] = ts_codebook[5][get_bits(&gb, 3)];
88  dec->vector[4] = ts_codebook[4][get_bits(&gb, 4)];
89  dec->vector[3] = ts_codebook[3][get_bits(&gb, 4)];
90  dec->vector[2] = ts_codebook[2][get_bits(&gb, 4)];
91  dec->vector[1] = ts_codebook[1][get_bits(&gb, 5)];
92  dec->vector[0] = ts_codebook[0][get_bits(&gb, 5)];
93  dec->flag = get_bits1(&gb);
94 
95  dec->offset1[0] = get_bits(&gb, 4) << 4;
96  dec->offset2[3] = get_bits(&gb, 7);
97  dec->offset2[2] = get_bits(&gb, 7);
98  dec->offset2[1] = get_bits(&gb, 7);
99  dec->offset2[0] = get_bits(&gb, 7);
100 
101  dec->offset1[1] = get_bits(&gb, 4);
102  dec->pulseval[1] = get_bits(&gb, 14);
103  dec->pulseval[0] = get_bits(&gb, 14);
104 
105  dec->offset1[1] |= get_bits(&gb, 4) << 4;
106  dec->pulseval[3] = get_bits(&gb, 14);
107  dec->pulseval[2] = get_bits(&gb, 14);
108 
109  dec->offset1[0] |= get_bits1(&gb);
110  dec->pulsepos[0] = get_bits_long(&gb, 27);
111  dec->pulseoff[0] = get_bits(&gb, 4);
112 
113  dec->offset1[0] |= get_bits1(&gb) << 1;
114  dec->pulsepos[1] = get_bits_long(&gb, 27);
115  dec->pulseoff[1] = get_bits(&gb, 4);
116 
117  dec->offset1[0] |= get_bits1(&gb) << 2;
118  dec->pulsepos[2] = get_bits_long(&gb, 27);
119  dec->pulseoff[2] = get_bits(&gb, 4);
120 
121  dec->offset1[0] |= get_bits1(&gb) << 3;
122  dec->pulsepos[3] = get_bits_long(&gb, 27);
123  dec->pulseoff[3] = get_bits(&gb, 4);
124 }
125 
127 {
128  int16_t tmp[8];
129  int i, j;
130 
131  for(i = 0; i < 8; i++){
132  if(i > 0){
133  memcpy(tmp, dec->cvector, i * sizeof(*tmp));
134  for(j = 0; j < i; j++)
135  dec->cvector[j] += (tmp[i - j - 1] * dec->vector[i] + 0x4000) >> 15;
136  }
137  dec->cvector[i] = (8 - dec->vector[i]) >> 3;
138  }
139  for(i = 0; i < 8; i++)
140  dec->cvector[i] = (dec->cvector[i] * ts_decay_994_1000[i]) >> 15;
141 
142  dec->filtval = dec->vector[0];
143 }
144 
146 {
147  int i;
148 
149  if(!dec->flag){
150  for(i = 0; i < 8; i++){
151  dec->filters[i + 0] = dec->prevfilt[i];
152  dec->filters[i + 8] = dec->prevfilt[i];
153  }
154  }else{
155  for(i = 0; i < 8; i++){
156  dec->filters[i + 0]=(dec->cvector[i] * 21846 + dec->prevfilt[i] * 10923 + 16384) >> 15;
157  dec->filters[i + 8]=(dec->cvector[i] * 10923 + dec->prevfilt[i] * 21846 + 16384) >> 15;
158  }
159  }
160  for(i = 0; i < 8; i++){
161  dec->filters[i + 16] = dec->cvector[i];
162  dec->filters[i + 24] = dec->cvector[i];
163  }
164 }
165 
166 static void truespeech_apply_twopoint_filter(TSContext *dec, int quart)
167 {
168  int16_t tmp[146 + 60], *ptr0, *ptr1;
169  const int16_t *filter;
170  int i, t, off;
171 
172  t = dec->offset2[quart];
173  if(t == 127){
174  memset(dec->newvec, 0, 60 * sizeof(*dec->newvec));
175  return;
176  }
177  for(i = 0; i < 146; i++)
178  tmp[i] = dec->filtbuf[i];
179  off = (t / 25) + dec->offset1[quart >> 1] + 18;
180  off = av_clip(off, 0, 145);
181  ptr0 = tmp + 145 - off;
182  ptr1 = tmp + 146;
183  filter = ts_order2_coeffs + (t % 25) * 2;
184  for(i = 0; i < 60; i++){
185  t = (ptr0[0] * filter[0] + ptr0[1] * filter[1] + 0x2000) >> 14;
186  ptr0++;
187  dec->newvec[i] = t;
188  ptr1[i] = t;
189  }
190 }
191 
192 static void truespeech_place_pulses(TSContext *dec, int16_t *out, int quart)
193 {
194  int16_t tmp[7];
195  int i, j, t;
196  const int16_t *ptr1;
197  int16_t *ptr2;
198  int coef;
199 
200  memset(out, 0, 60 * sizeof(*out));
201  for(i = 0; i < 7; i++) {
202  t = dec->pulseval[quart] & 3;
203  dec->pulseval[quart] >>= 2;
204  tmp[6 - i] = ts_pulse_scales[dec->pulseoff[quart] * 4 + t];
205  }
206 
207  coef = dec->pulsepos[quart] >> 15;
208  ptr1 = ts_pulse_values + 30;
209  ptr2 = tmp;
210  for(i = 0, j = 3; (i < 30) && (j > 0); i++){
211  t = *ptr1++;
212  if(coef >= t)
213  coef -= t;
214  else{
215  out[i] = *ptr2++;
216  ptr1 += 30;
217  j--;
218  }
219  }
220  coef = dec->pulsepos[quart] & 0x7FFF;
221  ptr1 = ts_pulse_values;
222  for(i = 30, j = 4; (i < 60) && (j > 0); i++){
223  t = *ptr1++;
224  if(coef >= t)
225  coef -= t;
226  else{
227  out[i] = *ptr2++;
228  ptr1 += 30;
229  j--;
230  }
231  }
232 
233 }
234 
235 static void truespeech_update_filters(TSContext *dec, int16_t *out, int quart)
236 {
237  int i;
238 
239  memmove(dec->filtbuf, &dec->filtbuf[60], 86 * sizeof(*dec->filtbuf));
240  for(i = 0; i < 60; i++){
241  dec->filtbuf[i + 86] = out[i] + dec->newvec[i] - (dec->newvec[i] >> 3);
242  out[i] += dec->newvec[i];
243  }
244 }
245 
246 static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
247 {
248  int i,k;
249  int t[8];
250  int16_t *ptr0, *ptr1;
251 
252  ptr0 = dec->tmp1;
253  ptr1 = dec->filters + quart * 8;
254  for(i = 0; i < 60; i++){
255  int sum = 0;
256  for(k = 0; k < 8; k++)
257  sum += ptr0[k] * (unsigned)ptr1[k];
258  sum = out[i] + ((int)(sum + 0x800U) >> 12);
259  out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
260  for(k = 7; k > 0; k--)
261  ptr0[k] = ptr0[k - 1];
262  ptr0[0] = out[i];
263  }
264 
265  for(i = 0; i < 8; i++)
266  t[i] = (ts_decay_35_64[i] * ptr1[i]) >> 15;
267 
268  ptr0 = dec->tmp2;
269  for(i = 0; i < 60; i++){
270  int sum = 0;
271  for(k = 0; k < 8; k++)
272  sum += ptr0[k] * t[k];
273  for(k = 7; k > 0; k--)
274  ptr0[k] = ptr0[k - 1];
275  ptr0[0] = out[i];
276  out[i] += (- sum) >> 12;
277  }
278 
279  for(i = 0; i < 8; i++)
280  t[i] = (ts_decay_3_4[i] * ptr1[i]) >> 15;
281 
282  ptr0 = dec->tmp3;
283  for(i = 0; i < 60; i++){
284  int sum = out[i] * (1 << 12);
285  for(k = 0; k < 8; k++)
286  sum += ptr0[k] * t[k];
287  for(k = 7; k > 0; k--)
288  ptr0[k] = ptr0[k - 1];
289  ptr0[0] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
290 
291  sum = ((ptr0[1] * (dec->filtval - (dec->filtval >> 2))) >> 4) + sum;
292  sum = sum - (sum >> 3);
293  out[i] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
294  }
295 }
296 
298 {
299  int i;
300 
301  for(i = 0; i < 8; i++)
302  c->prevfilt[i] = c->cvector[i];
303 }
304 
305 static int truespeech_decode_frame(AVCodecContext *avctx, void *data,
306  int *got_frame_ptr, AVPacket *avpkt)
307 {
308  AVFrame *frame = data;
309  const uint8_t *buf = avpkt->data;
310  int buf_size = avpkt->size;
311  TSContext *c = avctx->priv_data;
312 
313  int i, j;
314  int16_t *samples;
315  int iterations, ret;
316 
317  iterations = buf_size / 32;
318 
319  if (!iterations) {
320  av_log(avctx, AV_LOG_ERROR,
321  "Too small input buffer (%d bytes), need at least 32 bytes\n", buf_size);
322  return -1;
323  }
324 
325  /* get output buffer */
326  frame->nb_samples = iterations * 240;
327  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
328  return ret;
329  samples = (int16_t *)frame->data[0];
330 
331  memset(samples, 0, iterations * 240 * sizeof(*samples));
332 
333  for(j = 0; j < iterations; j++) {
334  truespeech_read_frame(c, buf);
335  buf += 32;
336 
339 
340  for(i = 0; i < 4; i++) {
342  truespeech_place_pulses (c, samples, i);
343  truespeech_update_filters(c, samples, i);
344  truespeech_synth (c, samples, i);
345  samples += 60;
346  }
347 
349  }
350 
351  *got_frame_ptr = 1;
352 
353  return buf_size;
354 }
355 
357  .name = "truespeech",
358  .long_name = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"),
359  .type = AVMEDIA_TYPE_AUDIO,
361  .priv_data_size = sizeof(TSContext),
364  .capabilities = AV_CODEC_CAP_DR1,
365 };
int pulseval[4]
7x2-bit pulse values
Definition: truespeech.c:47
static const int16_t ts_decay_994_1000[8]
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
static void truespeech_update_filters(TSContext *dec, int16_t *out, int quart)
Definition: truespeech.c:235
static int truespeech_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: truespeech.c:305
static void truespeech_correlate_filter(TSContext *dec)
Definition: truespeech.c:126
AVCodec ff_truespeech_decoder
Definition: truespeech.c:356
static void truespeech_apply_twopoint_filter(TSContext *dec, int quart)
Definition: truespeech.c:166
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define avpriv_request_sample(...)
int16_t filters[32]
Definition: truespeech.c:58
int size
Definition: packet.h:356
static void truespeech_filters_merge(TSContext *dec)
Definition: truespeech.c:145
int filtval
Definition: truespeech.c:56
AVCodec.
Definition: codec.h:190
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
static void truespeech_read_frame(TSContext *dec, const uint8_t *input)
Definition: truespeech.c:78
int16_t tmp1[8]
Definition: truespeech.c:52
BswapDSPContext bdsp
Definition: truespeech.c:39
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:196
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1194
uint8_t
#define av_cold
Definition: attributes.h:88
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: bswapdsp.h:25
static av_cold int truespeech_decode_init(AVCodecContext *avctx)
Definition: truespeech.c:61
static AVFrame * frame
const char data[16]
Definition: mxf.c:91
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
uint8_t * data
Definition: packet.h:355
bitstream reader API header.
static const int16_t *const ts_codebook[8]
static const int16_t ts_order2_coeffs[25 *2]
#define av_log(a,...)
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
const char * name
Name of the codec implementation.
Definition: codec.h:197
static const int16_t ts_pulse_values[120]
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1237
int pulsepos[4]
27-bit variable, encodes 7 pulse positions
Definition: truespeech.c:46
int16_t tmp3[8]
Definition: truespeech.c:54
int16_t vector[8]
input vector: 5/5/4/4/4/3/3/3
Definition: truespeech.c:42
audio channel layout utility functions
int16_t tmp2[8]
Definition: truespeech.c:53
int16_t cvector[8]
Definition: truespeech.c:55
TrueSpeech decoder context.
Definition: truespeech.c:38
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int offset2[4]
7-bit value, encodes offsets for copying and for two-point filter
Definition: truespeech.c:44
int prevfilt[8]
Definition: truespeech.c:51
Libavcodec external API header.
static const int16_t ts_decay_3_4[8]
main external API structure.
Definition: avcodec.h:526
int offset1[2]
8-bit value, used in one copying offset
Definition: truespeech.c:43
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1854
int16_t newvec[60]
Definition: truespeech.c:57
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
Definition: truespeech.c:246
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
int filtbuf[146]
Definition: truespeech.c:50
int pulseoff[4]
4-bit offset of pulse values block
Definition: truespeech.c:45
int
common internal api header.
signed 16 bits
Definition: samplefmt.h:61
static double c[64]
static const int16_t ts_decay_35_64[8]
int flag
1-bit flag, shows how to choose filters
Definition: truespeech.c:48
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
void * priv_data
Definition: avcodec.h:553
int channels
number of audio channels
Definition: avcodec.h:1187
static void truespeech_place_pulses(TSContext *dec, int16_t *out, int quart)
Definition: truespeech.c:192
FILE * out
Definition: movenc.c:54
static const int16_t ts_pulse_scales[64]
#define AV_CH_LAYOUT_MONO
This structure stores compressed data.
Definition: packet.h:332
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:366
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
static void truespeech_save_prevvec(TSContext *c)
Definition: truespeech.c:297
uint8_t buffer[32]
Definition: truespeech.c:41
static uint8_t tmp[11]
Definition: aes_ctr.c:26