FFmpeg
mpc8.c
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1 /*
2  * Musepack SV8 decoder
3  * Copyright (c) 2007 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 
22 /**
23  * @file
24  * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
25  * divided into 32 subbands.
26  */
27 
29 #include "libavutil/lfg.h"
30 #include "libavutil/thread.h"
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "internal.h"
34 #include "mpegaudiodsp.h"
35 
36 #include "mpc.h"
37 #include "mpc8data.h"
38 #include "mpc8huff.h"
39 
40 static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
41 static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
42 
43 static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
44 {
45  int len = mpc8_cnk_len[k-1][n-1] - 1;
46  int code = len ? get_bits_long(gb, len) : 0;
47 
48  if (code >= mpc8_cnk_lost[k-1][n-1])
49  code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
50 
51  return code;
52 }
53 
54 static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
55 {
56  int bits = 0;
57  const uint32_t * C = mpc8_cnk[k-1];
58  int code = mpc8_dec_base(gb, k, n);
59 
60  do {
61  n--;
62  if (code >= C[n]) {
63  bits |= 1U << n;
64  code -= C[n];
65  C -= 32;
66  k--;
67  }
68  } while(k > 0);
69 
70  return bits;
71 }
72 
73 static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
74 {
75  if(mpc8_cnk_len[0][m] < 1) return 0;
76  return mpc8_dec_base(gb, 1, m+1);
77 }
78 
79 static int mpc8_get_mask(GetBitContext *gb, int size, int t)
80 {
81  int mask = 0;
82 
83  if(t && t != size)
84  mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
85  if((t << 1) > size) mask = ~mask;
86 
87  return mask;
88 }
89 
90 static av_cold void build_vlc(VLC *vlc, unsigned *buf_offset,
91  const uint8_t codes_counts[16],
92  const uint8_t **syms, int offset)
93 {
94  static VLC_TYPE vlc_buf[9296][2];
96  unsigned num = 0;
97 
98  vlc->table = &vlc_buf[*buf_offset];
99  vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *buf_offset;
100 
101  for (int i = 16; i > 0; i--)
102  for (unsigned tmp = num + codes_counts[i - 1]; num < tmp; num++)
103  len[num] = i;
104 
105  ff_init_vlc_from_lengths(vlc, FFMIN(len[0], 9), num, len, 1,
106  *syms, 1, 1, offset, INIT_VLC_STATIC_OVERLONG, NULL);
107  *buf_offset += vlc->table_size;
108  *syms += num;
109 }
110 
111 static av_cold void mpc8_init_static(void)
112 {
113  const uint8_t *q_syms = mpc8_q_syms, *bands_syms = mpc8_bands_syms;
114  const uint8_t *res_syms = mpc8_res_syms, *scfi_syms = mpc8_scfi_syms;
115  const uint8_t *dscf_syms = mpc8_dscf_syms;
116  unsigned offset = 0;
117 
118  build_vlc(&band_vlc, &offset, mpc8_bands_len_counts, &bands_syms, 0);
119 
120  build_vlc(&q1_vlc, &offset, mpc8_q1_len_counts, &q_syms, 0);
121  build_vlc(&q9up_vlc, &offset, mpc8_q9up_len_counts, &q_syms, 0);
122 
123  for (int i = 0; i < 2; i++){
124  build_vlc(&scfi_vlc[i], &offset, mpc8_scfi_len_counts[i], &scfi_syms, 0);
125 
126  build_vlc(&dscf_vlc[i], &offset, mpc8_dscf_len_counts[i], &dscf_syms, 0);
127 
128  build_vlc(&res_vlc[i], &offset, mpc8_res_len_counts[i], &res_syms, 0);
129 
130  build_vlc(&q2_vlc[i], &offset, mpc8_q2_len_counts[i], &q_syms, 0);
131  build_vlc(&q3_vlc[i], &offset, mpc8_q34_len_counts[i],
132  &q_syms, -48 - 16 * i);
133  for (int j = 0; j < 4; j++)
134  build_vlc(&quant_vlc[j][i], &offset, mpc8_q5_8_len_counts[i][j],
135  &q_syms, -((8 << j) - 1));
136  }
138 }
139 
141 {
142  static AVOnce init_static_once = AV_ONCE_INIT;
143  MPCContext *c = avctx->priv_data;
144  GetBitContext gb;
145  int channels;
146 
147  if(avctx->extradata_size < 2){
148  av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
149  return -1;
150  }
151  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
152  av_lfg_init(&c->rnd, 0xDEADBEEF);
153  ff_mpadsp_init(&c->mpadsp);
154 
155  init_get_bits(&gb, avctx->extradata, 16);
156 
157  skip_bits(&gb, 3);//sample rate
158  c->maxbands = get_bits(&gb, 5) + 1;
159  if (c->maxbands >= BANDS) {
160  av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
161  return AVERROR_INVALIDDATA;
162  }
163  channels = get_bits(&gb, 4) + 1;
164  if (channels > 2) {
165  avpriv_request_sample(avctx, "Multichannel MPC SV8");
166  return AVERROR_PATCHWELCOME;
167  }
168  c->MSS = get_bits1(&gb);
169  c->frames = 1 << (get_bits(&gb, 3) * 2);
170 
172  avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
173  avctx->channels = channels;
174 
175  ff_thread_once(&init_static_once, mpc8_init_static);
176 
177  return 0;
178 }
179 
180 static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
181  int *got_frame_ptr, AVPacket *avpkt)
182 {
183  AVFrame *frame = data;
184  const uint8_t *buf = avpkt->data;
185  int buf_size = avpkt->size;
186  MPCContext *c = avctx->priv_data;
187  GetBitContext gb2, *gb = &gb2;
188  int i, j, k, ch, cnt, res, t;
189  Band *bands = c->bands;
190  int off;
191  int maxband, keyframe;
192  int last[2];
193 
194  keyframe = c->cur_frame == 0;
195 
196  if(keyframe){
197  memset(c->Q, 0, sizeof(c->Q));
198  c->last_bits_used = 0;
199  }
200  if ((res = init_get_bits8(gb, buf, buf_size)) < 0)
201  return res;
202 
203  skip_bits(gb, c->last_bits_used & 7);
204 
205  if(keyframe)
206  maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
207  else{
208  maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
209  if(maxband > 32) maxband -= 33;
210  }
211 
212  if (get_bits_left(gb) < 0) {
213  *got_frame_ptr = 0;
214  return buf_size;
215  }
216 
217  if(maxband > c->maxbands + 1) {
218  av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
219  return AVERROR_INVALIDDATA;
220  }
221  c->last_max_band = maxband;
222 
223  /* read subband indexes */
224  if(maxband){
225  last[0] = last[1] = 0;
226  for(i = maxband - 1; i >= 0; i--){
227  for(ch = 0; ch < 2; ch++){
228  last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
229  if(last[ch] > 15) last[ch] -= 17;
230  bands[i].res[ch] = last[ch];
231  }
232  }
233  if(c->MSS){
234  int mask;
235 
236  cnt = 0;
237  for(i = 0; i < maxband; i++)
238  if(bands[i].res[0] || bands[i].res[1])
239  cnt++;
240  t = mpc8_get_mod_golomb(gb, cnt);
241  mask = mpc8_get_mask(gb, cnt, t);
242  for(i = maxband - 1; i >= 0; i--)
243  if(bands[i].res[0] || bands[i].res[1]){
244  bands[i].msf = mask & 1;
245  mask >>= 1;
246  }
247  }
248  }
249  for(i = maxband; i < c->maxbands; i++)
250  bands[i].res[0] = bands[i].res[1] = 0;
251 
252  if(keyframe){
253  for(i = 0; i < 32; i++)
254  c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
255  }
256 
257  for(i = 0; i < maxband; i++){
258  if(bands[i].res[0] || bands[i].res[1]){
259  cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
260  if(cnt >= 0){
261  t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
262  if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
263  if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
264  }
265  }
266  }
267 
268  for(i = 0; i < maxband; i++){
269  for(ch = 0; ch < 2; ch++){
270  if(!bands[i].res[ch]) continue;
271 
272  if(c->oldDSCF[ch][i]){
273  bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
274  c->oldDSCF[ch][i] = 0;
275  }else{
276  t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
277  if(t == 64)
278  t += get_bits(gb, 6);
279  bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
280  }
281  for(j = 0; j < 2; j++){
282  if((bands[i].scfi[ch] << j) & 2)
283  bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
284  else{
285  t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
286  if(t == 31)
287  t = 64 + get_bits(gb, 6);
288  bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
289  }
290  }
291  }
292  }
293 
294  for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
295  for(ch = 0; ch < 2; ch++){
296  res = bands[i].res[ch];
297  switch(res){
298  case -1:
299  for(j = 0; j < SAMPLES_PER_BAND; j++)
300  c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
301  break;
302  case 0:
303  break;
304  case 1:
305  for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
306  cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
307  t = mpc8_get_mask(gb, 18, cnt);
308  for(k = 0; k < SAMPLES_PER_BAND / 2; k++)
309  c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1))
310  ? (get_bits1(gb) << 1) - 1 : 0;
311  }
312  break;
313  case 2:
314  cnt = 6;//2*mpc8_thres[res]
315  for(j = 0; j < SAMPLES_PER_BAND; j += 3){
316  t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
317  c->Q[ch][off + j + 0] = mpc8_idx50[t];
318  c->Q[ch][off + j + 1] = mpc8_idx51[t];
319  c->Q[ch][off + j + 2] = mpc8_idx52[t];
320  cnt = (cnt >> 1) + mpc8_huffq2[t];
321  }
322  break;
323  case 3:
324  case 4:
325  for(j = 0; j < SAMPLES_PER_BAND; j += 2){
326  t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2);
327  c->Q[ch][off + j + 1] = t >> 4;
328  c->Q[ch][off + j + 0] = sign_extend(t, 4);
329  }
330  break;
331  case 5:
332  case 6:
333  case 7:
334  case 8:
335  cnt = 2 * mpc8_thres[res];
336  for(j = 0; j < SAMPLES_PER_BAND; j++){
337  const VLC *vlc = &quant_vlc[res - 5][cnt > mpc8_thres[res]];
338  c->Q[ch][off + j] = get_vlc2(gb, vlc->table, vlc->bits, 2);
339  cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
340  }
341  break;
342  default:
343  for(j = 0; j < SAMPLES_PER_BAND; j++){
344  c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
345  if(res != 9){
346  c->Q[ch][off + j] <<= res - 9;
347  c->Q[ch][off + j] |= get_bits(gb, res - 9);
348  }
349  c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
350  }
351  }
352  }
353  }
354 
355  frame->nb_samples = MPC_FRAME_SIZE;
356  if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
357  return res;
358 
359  ff_mpc_dequantize_and_synth(c, maxband - 1,
360  (int16_t **)frame->extended_data,
361  avctx->channels);
362 
363  c->cur_frame++;
364 
366  if(c->cur_frame >= c->frames)
367  c->cur_frame = 0;
368  if (get_bits_left(gb) < 0) {
369  av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
370  c->last_bits_used = buf_size << 3;
371  } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left
372  c->last_bits_used = buf_size << 3;
373  }
374 
375  *got_frame_ptr = 1;
376 
377  return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
378 }
379 
381 {
382  MPCContext *c = avctx->priv_data;
383  c->cur_frame = 0;
384 }
385 
387  .name = "mpc8",
388  .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
389  .type = AVMEDIA_TYPE_AUDIO,
390  .id = AV_CODEC_ID_MUSEPACK8,
391  .priv_data_size = sizeof(MPCContext),
396  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
398  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
399 };
#define NULL
Definition: coverity.c:32
void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels)
Definition: mpc.c:56
int table_size
Definition: vlc.h:29
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
static VLC q2_vlc[2]
Definition: mpc8.c:41
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static void flush(AVCodecContext *avctx)
MPADSPContext mpadsp
Definition: mpc.h:55
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:31
#define avpriv_request_sample(...)
int msf
mid-stereo flag
Definition: mpc.h:46
int Q[2][MPC_FRAME_SIZE]
Definition: mpc.h:62
int size
Definition: packet.h:370
int res[2]
Definition: mpc.h:47
AVLFG rnd
Definition: mpc.h:66
static const uint8_t mpc8_q_syms[]
Definition: mpc8huff.h:129
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Definition: codec.h:104
#define FF_ARRAY_ELEMS(a)
int last_max_band
Definition: mpc.h:58
#define AV_CH_LAYOUT_STEREO
AVCodec.
Definition: codec.h:197
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
#define MPC8_Q3_BITS
Definition: mpc8huff.h:106
static const uint32_t mpc8_cnk_lost[16][33]
Definition: mpc8data.h:101
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:41
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1204
uint8_t
#define av_cold
Definition: attributes.h:88
#define MPC8_Q1_BITS
Definition: mpc8huff.h:87
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
static VLC q3_vlc[2]
Definition: mpc8.c:41
static const uint8_t mpc8_bands_syms[MPC8_BANDS_SIZE]
Definition: mpc8huff.h:32
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
static const uint8_t mpc8_res_syms[]
Definition: mpc8huff.h:75
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:637
int scf_idx[2][3]
Definition: mpc.h:49
#define MPC8_DSCF1_BITS
Definition: mpc8huff.h:53
uint8_t * data
Definition: packet.h:369
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:100
channels
Definition: aptx.h:33
#define AVOnce
Definition: thread.h:172
int last_bits_used
Definition: mpc.h:59
#define av_log(a,...)
static const uint16_t table[]
Definition: prosumer.c:206
static const int8_t mpc8_huffq2[5 *5 *5]
Definition: mpc8data.h:50
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
#define MPC8_MAX_VLC_SIZE
Definition: mpc8huff.h:27
static const int8_t mpc8_idx50[125]
Definition: mpc8data.h:27
static const uint16_t mask[17]
Definition: lzw.c:38
int cur_frame
Definition: mpc.h:63
static VLC dscf_vlc[2]
Definition: mpc8.c:40
static av_cold int mpc8_decode_init(AVCodecContext *avctx)
Definition: mpc8.c:140
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:117
static VLC quant_vlc[4][2]
Definition: mpc8.c:41
static av_cold void build_vlc(VLC *vlc, unsigned *buf_offset, const uint8_t codes_counts[16], const uint8_t **syms, int offset)
Definition: mpc8.c:90
const char * name
Name of the codec implementation.
Definition: codec.h:204
static const uint8_t mpc8_q5_8_len_counts[2][4][16]
Definition: mpc8huff.h:114
uint8_t bits
Definition: vp3data.h:141
int maxbands
Definition: mpc.h:58
#define SAMPLES_PER_BAND
Definition: mpc.h:41
static av_cold void mpc8_init_static(void)
Definition: mpc8.c:111
Definition: vlc.h:26
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1247
static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
Definition: mpc8.c:380
void ff_mpa_synth_init_fixed(void)
static const int8_t mpc8_idx51[125]
Definition: mpc8data.h:34
audio channel layout utility functions
#define MPC_FRAME_SIZE
Definition: mpc.h:42
static int mpc8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: mpc8.c:180
#define FFMIN(a, b)
Definition: common.h:105
static int mpc8_get_mod_golomb(GetBitContext *gb, int m)
Definition: mpc8.c:73
static const uint8_t mpc8_dscf_syms[]
Definition: mpc8huff.h:55
AVCodec ff_mpc8_decoder
Definition: mpc8.c:386
static const uint8_t mpc8_q9up_len_counts[16]
Definition: mpc8huff.h:95
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:797
static const uint8_t mpc8_cnk_len[16][33]
Definition: mpc8data.h:80
static const uint8_t mpc8_dscf_len_counts[2][16]
Definition: mpc8huff.h:68
static VLC q9up_vlc
Definition: mpc8.c:41
static const uint8_t mpc8_bands_len_counts[16]
Definition: mpc8huff.h:36
int bits
Definition: vlc.h:27
s EdgeDetect Foobar g libavfilter vf_edgedetect c libavfilter vf_foobar c edit libavfilter and add an entry for foobar following the pattern of the other filters edit libavfilter allfilters and add an entry for foobar following the pattern of the other filters configure make j< whatever > ffmpeg ffmpeg i you should get a foobar png with Lena edge detected That s your new playground is ready Some little details about what s going which in turn will define variables for the build system and the C
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int table_allocated
Definition: vlc.h:29
static const uint8_t mpc8_q1_len_counts[16]
Definition: mpc8huff.h:89
static const uint8_t mpc8_res_len_counts[2][16]
Definition: mpc8huff.h:82
#define AV_ONCE_INIT
Definition: thread.h:173
Libavcodec external API header.
Musepack decoder MPEG Audio Layer 1/2 -like codec with frames of 1152 samples divided into 32 subband...
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
int scfi[2]
Definition: mpc.h:48
main external API structure.
Definition: avcodec.h:536
static const float bands[]
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1893
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:53
int extradata_size
Definition: avcodec.h:638
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
int oldDSCF[2][BANDS]
Definition: mpc.h:60
static VLC scfi_vlc[2]
Definition: mpc8.c:40
int ff_init_vlc_from_lengths(VLC *vlc_arg, int nb_bits, int nb_codes, const int8_t *lens, int lens_wrap, const void *symbols, int symbols_wrap, int symbols_size, int offset, int flags, void *logctx)
Build VLC decoding tables suitable for use with get_vlc2()
Definition: bitstream.c:381
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
static const uint32_t mpc8_cnk[16][32]
Definition: mpc8data.h:60
static int mpc8_dec_base(GetBitContext *gb, int k, int n)
Definition: mpc8.c:43
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:32
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
static const uint8_t mpc8_q34_len_counts[2][16]
Definition: mpc8huff.h:109
static const unsigned int mpc8_thres[]
Definition: mpc8data.h:49
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:130
#define BANDS
Definition: imc.c:55
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
static const uint8_t mpc8_scfi_syms[]
Definition: mpc8huff.h:40
#define MPC8_Q9UP_BITS
Definition: mpc8huff.h:93
Band bands[BANDS]
Definition: mpc.h:61
common internal api header.
static const int8_t mpc8_idx52[125]
Definition: mpc8data.h:41
#define MPC8_DSCF0_BITS
Definition: mpc8huff.h:52
#define MPC8_RES_BITS
Definition: mpc8huff.h:73
static VLC q1_vlc
Definition: mpc8.c:41
int MSS
Definition: mpc.h:56
static const uint8_t mpc8_scfi_len_counts[2][16]
Definition: mpc8huff.h:47
void * priv_data
Definition: avcodec.h:563
int len
int channels
number of audio channels
Definition: avcodec.h:1197
static VLC res_vlc[2]
Definition: mpc8.c:40
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:175
int frames
Definition: mpc.h:63
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
static const uint8_t mpc8_q2_len_counts[2][16]
Definition: mpc8huff.h:101
static int mpc8_get_mask(GetBitContext *gb, int size, int t)
Definition: mpc8.c:79
static VLC_TYPE vlc_buf[16716][2]
Definition: clearvideo.c:86
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:941
static VLC band_vlc
Definition: mpc8.c:40
signed 16 bits, planar
Definition: samplefmt.h:67
#define VLC_TYPE
Definition: vlc.h:24
#define MPC8_BANDS_BITS
Definition: mpc8huff.h:30
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:365
#define AV_CH_LAYOUT_MONO
#define INIT_VLC_STATIC_OVERLONG
Definition: vlc.h:96
Subband structure - hold all variables for each subband.
Definition: mpc.h:45
This structure stores compressed data.
Definition: packet.h:346
av_cold void ff_mpadsp_init(MPADSPContext *s)
Definition: mpegaudiodsp.c:81
static int mpc8_dec_enum(GetBitContext *gb, int k, int n)
Definition: mpc8.c:54
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:384
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators...
Definition: codec.h:52
#define MPC8_Q2_BITS
Definition: mpc8huff.h:99
int i
Definition: input.c:407
Definition: mpc.h:53
static uint8_t tmp[11]
Definition: aes_ctr.c:27