FFmpeg
hcadec.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/crc.h"
20 #include "libavutil/float_dsp.h"
21 #include "libavutil/intreadwrite.h"
22 #include "libavutil/mem_internal.h"
23 #include "libavutil/tx.h"
24 
25 #include "avcodec.h"
26 #include "get_bits.h"
27 #include "internal.h"
28 #include "hca_data.h"
29 
30 typedef struct ChannelContext {
31  float base[128];
32  DECLARE_ALIGNED(32, float, imdct_in)[128];
33  DECLARE_ALIGNED(32, float, imdct_out)[128];
34  DECLARE_ALIGNED(32, float, imdct_prev)[128];
35  int8_t scale_factors[128];
36  uint8_t scale[128];
37  int8_t intensity[8];
38  int8_t *hfr_scale;
39  unsigned count;
40  int chan_type;
42 
43 typedef struct HCAContext {
45 
46  const AVCRC *crc_table;
47 
49 
50  uint8_t ath[128];
51 
52  int ath_type;
53  unsigned hfr_group_count;
54  uint8_t track_count;
55  uint8_t channel_config;
57  uint8_t base_band_count;
60 
64 } HCAContext;
65 
66 static void ath_init1(uint8_t *ath, int sample_rate)
67 {
68  unsigned int index;
69  unsigned int acc = 0;
70 
71  for (int i = 0; i < 128; i++) {
72  acc += sample_rate;
73  index = acc >> 13;
74 
75  if (index >= 654) {
76  memset(ath+i, 0xFF, (128 - i));
77  break;
78  }
79 
81  }
82 }
83 
84 static int ath_init(uint8_t *ath, int type, int sample_rate)
85 {
86  switch (type) {
87  case 0:
88  /* nothing to do */
89  break;
90  case 1:
92  break;
93  default:
94  return AVERROR_INVALIDDATA;
95  }
96 
97  return 0;
98 }
99 
100 static inline unsigned ceil2(unsigned a, unsigned b)
101 {
102  return (b > 0) ? (a / b + ((a % b) ? 1 : 0)) : 0;
103 }
104 
106 {
107  HCAContext *c = avctx->priv_data;
108  GetBitContext *gb = &c->gb;
109  int8_t r[16] = { 0 };
110  float scale = 1.f / 8.f;
111  unsigned b, chunk;
112  int version, ret;
113 
115  c->crc_table = av_crc_get_table(AV_CRC_16_ANSI);
116 
117  if (avctx->channels <= 0 || avctx->channels > 16)
118  return AVERROR(EINVAL);
119 
120  ret = init_get_bits8(gb, avctx->extradata, avctx->extradata_size);
121  if (ret < 0)
122  return ret;
123  skip_bits_long(gb, 32);
124  version = get_bits(gb, 16);
125  skip_bits_long(gb, 16);
126 
127  c->ath_type = version >= 0x200 ? 0 : 1;
128 
129  if (get_bits_long(gb, 32) != MKBETAG('f', 'm', 't', 0))
130  return AVERROR_INVALIDDATA;
131  skip_bits_long(gb, 32);
132  skip_bits_long(gb, 32);
133  skip_bits_long(gb, 32);
134 
135  chunk = get_bits_long(gb, 32);
136  if (chunk == MKBETAG('c', 'o', 'm', 'p')) {
137  skip_bits_long(gb, 16);
138  skip_bits_long(gb, 8);
139  skip_bits_long(gb, 8);
140  c->track_count = get_bits(gb, 8);
141  c->channel_config = get_bits(gb, 8);
142  c->total_band_count = get_bits(gb, 8);
143  c->base_band_count = get_bits(gb, 8);
144  c->stereo_band_count = get_bits(gb, 8);
145  c->bands_per_hfr_group = get_bits(gb, 8);
146  } else if (chunk == MKBETAG('d', 'e', 'c', 0)) {
147  skip_bits_long(gb, 16);
148  skip_bits_long(gb, 8);
149  skip_bits_long(gb, 8);
150  c->total_band_count = get_bits(gb, 8) + 1;
151  c->base_band_count = get_bits(gb, 8) + 1;
152  c->track_count = get_bits(gb, 4);
153  c->channel_config = get_bits(gb, 4);
154  if (!get_bits(gb, 8))
155  c->base_band_count = c->total_band_count;
156  c->stereo_band_count = c->total_band_count - c->base_band_count;
157  c->bands_per_hfr_group = 0;
158  } else
159  return AVERROR_INVALIDDATA;
160 
161  if (c->total_band_count > FF_ARRAY_ELEMS(c->ch->imdct_in))
162  return AVERROR_INVALIDDATA;
163 
164 
165  while (get_bits_left(gb) >= 32) {
166  chunk = get_bits_long(gb, 32);
167  if (chunk == MKBETAG('v', 'b', 'r', 0)) {
168  skip_bits_long(gb, 16);
169  skip_bits_long(gb, 16);
170  } else if (chunk == MKBETAG('a', 't', 'h', 0)) {
171  c->ath_type = get_bits(gb, 16);
172  } else if (chunk == MKBETAG('r', 'v', 'a', 0)) {
173  skip_bits_long(gb, 32);
174  } else if (chunk == MKBETAG('c', 'o', 'm', 'm')) {
175  skip_bits_long(gb, get_bits(gb, 8) * 8);
176  } else if (chunk == MKBETAG('c', 'i', 'p', 'h')) {
177  skip_bits_long(gb, 16);
178  } else if (chunk == MKBETAG('l', 'o', 'o', 'p')) {
179  skip_bits_long(gb, 32);
180  skip_bits_long(gb, 32);
181  skip_bits_long(gb, 16);
182  skip_bits_long(gb, 16);
183  } else if (chunk == MKBETAG('p', 'a', 'd', 0)) {
184  break;
185  } else {
186  break;
187  }
188  }
189 
190  ret = ath_init(c->ath, c->ath_type, avctx->sample_rate);
191  if (ret < 0)
192  return ret;
193 
194  if (!c->track_count)
195  c->track_count = 1;
196 
197  b = avctx->channels / c->track_count;
198  if (c->stereo_band_count && b > 1) {
199  int8_t *x = r;
200 
201  for (int i = 0; i < c->track_count; i++, x+=b) {
202  switch (b) {
203  case 2:
204  case 3:
205  x[0] = 1;
206  x[1] = 2;
207  break;
208  case 4:
209  x[0]=1; x[1] = 2;
210  if (c->channel_config == 0) {
211  x[2]=1;
212  x[3]=2;
213  }
214  break;
215  case 5:
216  x[0]=1; x[1] = 2;
217  if (c->channel_config <= 2) {
218  x[3]=1;
219  x[4]=2;
220  }
221  break;
222  case 6:
223  case 7:
224  x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2;
225  break;
226  case 8:
227  x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2; x[6] = 1; x[7] = 2;
228  break;
229  }
230  }
231  }
232 
233  if (c->total_band_count < c->base_band_count)
234  return AVERROR_INVALIDDATA;
235 
236  c->hfr_group_count = ceil2(c->total_band_count - (c->base_band_count + c->stereo_band_count),
237  c->bands_per_hfr_group);
238 
239  if (c->base_band_count + c->stereo_band_count + (unsigned long)c->hfr_group_count > 128ULL)
240  return AVERROR_INVALIDDATA;
241 
242  for (int i = 0; i < avctx->channels; i++) {
243  c->ch[i].chan_type = r[i];
244  c->ch[i].count = c->base_band_count + ((r[i] != 2) ? c->stereo_band_count : 0);
245  c->ch[i].hfr_scale = &c->ch[i].scale_factors[c->base_band_count + c->stereo_band_count];
246  if (c->ch[i].count > 128)
247  return AVERROR_INVALIDDATA;
248  }
249 
251  if (!c->fdsp)
252  return AVERROR(ENOMEM);
253 
254  return av_tx_init(&c->tx_ctx, &c->tx_fn, AV_TX_FLOAT_MDCT, 1, 128, &scale, 0);
255 }
256 
257 static void run_imdct(HCAContext *c, ChannelContext *ch, int index, float *out)
258 {
259  c->tx_fn(c->tx_ctx, ch->imdct_out, ch->imdct_in, sizeof(float));
260 
261  c->fdsp->vector_fmul_window(out, ch->imdct_prev + (128 >> 1),
262  ch->imdct_out, window, 128 >> 1);
263 
264  memcpy(ch->imdct_prev, ch->imdct_out, 128 * sizeof(float));
265 }
266 
268  int index, unsigned band_count, unsigned base_band_count,
269  unsigned stereo_band_count)
270 {
271  float ratio_l = intensity_ratio_table[ch2->intensity[index]];
272  float ratio_r = ratio_l - 2.0f;
273  float *c1 = &ch1->imdct_in[base_band_count];
274  float *c2 = &ch2->imdct_in[base_band_count];
275 
276  if (ch1->chan_type != 1 || !stereo_band_count)
277  return;
278 
279  for (int i = 0; i < band_count; i++) {
280  *(c2++) = *c1 * ratio_r;
281  *(c1++) *= ratio_l;
282  }
283 }
284 
286  unsigned hfr_group_count,
287  unsigned bands_per_hfr_group,
288  unsigned start_band, unsigned total_band_count)
289 {
290  if (ch->chan_type == 2 || !bands_per_hfr_group)
291  return;
292 
293  for (int i = 0, k = start_band, l = start_band - 1; i < hfr_group_count; i++){
294  for (int j = 0; j < bands_per_hfr_group && k < total_band_count && l >= 0; j++, k++, l--){
296  av_clip_intp2(ch->hfr_scale[i] - ch->scale_factors[l], 6) ] * ch->imdct_in[l];
297  }
298  }
299 
300  ch->imdct_in[127] = 0;
301 }
302 
304 {
305  GetBitContext *gb = &c->gb;
306 
307  for (int i = 0; i < ch->count; i++) {
308  unsigned scale = ch->scale[i];
309  int nb_bits = max_bits_table[scale];
310  int value = get_bitsz(gb, nb_bits);
311  float factor;
312 
313  if (scale > 7) {
314  value = (1 - ((value & 1) << 1)) * (value >> 1);
315  if (!value)
316  skip_bits_long(gb, -1);
317  factor = value;
318  } else {
319  value += scale << 4;
320  skip_bits_long(gb, quant_spectrum_bits[value] - nb_bits);
322  }
323  ch->imdct_in[i] = factor * ch->base[i];
324  }
325 
326  memset(ch->imdct_in + ch->count, 0, sizeof(ch->imdct_in) - ch->count * sizeof(ch->imdct_in[0]));
327 }
328 
329 static void unpack(HCAContext *c, ChannelContext *ch,
330  unsigned hfr_group_count,
331  int packed_noise_level,
332  const uint8_t *ath)
333 {
334  GetBitContext *gb = &c->gb;
335  int delta_bits = get_bits(gb, 3);
336 
337  if (delta_bits > 5) {
338  for (int i = 0; i < ch->count; i++)
339  ch->scale_factors[i] = get_bits(gb, 6);
340  } else if (delta_bits) {
341  int factor = get_bits(gb, 6);
342  int max_value = (1 << delta_bits) - 1;
343  int half_max = max_value >> 1;
344 
345  ch->scale_factors[0] = factor;
346  for (int i = 1; i < ch->count; i++){
347  int delta = get_bits(gb, delta_bits);
348 
349  if (delta == max_value) {
350  factor = get_bits(gb, 6);
351  } else {
352  factor += delta - half_max;
353  }
355 
356  ch->scale_factors[i] = factor;
357  }
358  } else {
359  memset(ch->scale_factors, 0, 128);
360  }
361 
362  if (ch->chan_type == 2){
363  ch->intensity[0] = get_bits(gb, 4);
364  if (ch->intensity[0] < 15) {
365  for (int i = 1; i < 8; i++)
366  ch->intensity[i] = get_bits(gb, 4);
367  }
368  } else {
369  for (int i = 0; i < hfr_group_count; i++)
370  ch->hfr_scale[i] = get_bits(gb, 6);
371  }
372 
373  for (int i = 0; i < ch->count; i++) {
374  int scale = ch->scale_factors[i];
375 
376  if (scale) {
377  scale = c->ath[i] + ((packed_noise_level + i) >> 8) - ((scale * 5) >> 1) + 2;
378  scale = scale_table[av_clip(scale, 0, 58)];
379  }
380  ch->scale[i] = scale;
381  }
382 
383  memset(ch->scale + ch->count, 0, sizeof(ch->scale) - ch->count);
384 
385  for (int i = 0; i < ch->count; i++)
387 }
388 
389 static int decode_frame(AVCodecContext *avctx, void *data,
390  int *got_frame_ptr, AVPacket *avpkt)
391 {
392  AVFrame *frame = data;
393  HCAContext *c = avctx->priv_data;
394  int ch, ret, packed_noise_level;
395  GetBitContext *gb = &c->gb;
396  float **samples;
397 
398  if (avctx->err_recognition & AV_EF_CRCCHECK) {
399  if (av_crc(c->crc_table, 0, avpkt->data, avpkt->size))
400  return AVERROR_INVALIDDATA;
401  }
402 
403  if ((ret = init_get_bits8(gb, avpkt->data, avpkt->size)) < 0)
404  return ret;
405 
406  if (get_bits(gb, 16) != 0xFFFF)
407  return AVERROR_INVALIDDATA;
408 
409  frame->nb_samples = 1024;
410  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
411  return ret;
412  samples = (float **)frame->extended_data;
413 
414  packed_noise_level = (get_bits(gb, 9) << 8) - get_bits(gb, 7);
415 
416  for (ch = 0; ch < avctx->channels; ch++)
417  unpack(c, &c->ch[ch], c->hfr_group_count, packed_noise_level, c->ath);
418 
419  for (int i = 0; i < 8; i++) {
420  for (ch = 0; ch < avctx->channels; ch++)
421  dequantize_coefficients(c, &c->ch[ch]);
422  for (ch = 0; ch < avctx->channels; ch++)
423  reconstruct_hfr(c, &c->ch[ch], c->hfr_group_count, c->bands_per_hfr_group,
424  c->stereo_band_count + c->base_band_count, c->total_band_count);
425  for (ch = 0; ch < avctx->channels - 1; ch++)
426  apply_intensity_stereo(c, &c->ch[ch], &c->ch[ch+1], i,
427  c->total_band_count - c->base_band_count,
428  c->base_band_count, c->stereo_band_count);
429  for (ch = 0; ch < avctx->channels; ch++)
430  run_imdct(c, &c->ch[ch], i, samples[ch] + i * 128);
431  }
432 
433  *got_frame_ptr = 1;
434 
435  return avpkt->size;
436 }
437 
439 {
440  HCAContext *c = avctx->priv_data;
441 
442  av_freep(&c->fdsp);
443  av_tx_uninit(&c->tx_ctx);
444 
445  return 0;
446 }
447 
449  .name = "hca",
450  .long_name = NULL_IF_CONFIG_SMALL("CRI HCA"),
451  .type = AVMEDIA_TYPE_AUDIO,
452  .id = AV_CODEC_ID_HCA,
453  .priv_data_size = sizeof(HCAContext),
454  .init = decode_init,
455  .decode = decode_frame,
456  .close = decode_close,
457  .capabilities = AV_CODEC_CAP_DR1,
458  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
460 };
AVCodec
AVCodec.
Definition: codec.h:202
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:69
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:292
ChannelContext::hfr_scale
int8_t * hfr_scale
Definition: hcadec.c:38
av_clip
#define av_clip
Definition: common.h:96
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:850
r
const char * r
Definition: vf_curves.c:116
acc
int acc
Definition: yuv2rgb.c:554
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
mem_internal.h
out
FILE * out
Definition: movenc.c:54
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:992
AVCRC
uint32_t AVCRC
Definition: crc.h:46
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:948
av_clip_uintp2
#define av_clip_uintp2
Definition: common.h:120
unpack
static void unpack(HCAContext *c, ChannelContext *ch, unsigned hfr_group_count, int packed_noise_level, const uint8_t *ath)
Definition: hcadec.c:329
AVTXContext
Definition: tx_priv.h:110
AVCodecContext::err_recognition
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1324
get_bits_long
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:547
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
index
fg index
Definition: ffmpeg_filter.c:168
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
b
#define b
Definition: input.c:40
data
const char data[16]
Definition: mxf.c:143
ChannelContext::imdct_prev
float imdct_prev[128]
Definition: hcadec.c:34
c1
static const uint64_t c1
Definition: murmur3.c:51
apply_intensity_stereo
static void apply_intensity_stereo(HCAContext *s, ChannelContext *ch1, ChannelContext *ch2, int index, unsigned band_count, unsigned base_band_count, unsigned stereo_band_count)
Definition: hcadec.c:267
sample_rate
sample_rate
Definition: ffmpeg_filter.c:156
av_tx_init
av_cold int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags)
Initialize a transform context with the given configuration (i)MDCTs with an odd length are currently...
Definition: tx.c:228
ff_hca_decoder
const AVCodec ff_hca_decoder
Definition: hcadec.c:448
crc.h
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:380
window
static SDL_Window * window
Definition: ffplay.c:364
GetBitContext
Definition: get_bits.h:62
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:463
type
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 type
Definition: writing_filters.txt:86
scale
static av_always_inline float scale(float x, float s)
Definition: vf_v360.c:1376
ChannelContext::base
float base[128]
Definition: hcadec.c:31
HCAContext::bands_per_hfr_group
uint8_t bands_per_hfr_group
Definition: hcadec.c:59
HCAContext::hfr_group_count
unsigned hfr_group_count
Definition: hcadec.c:53
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:678
av_tx_fn
void(* av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride)
Function pointer to a function to perform the transform.
Definition: tx.h:102
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
ath_init1
static void ath_init1(uint8_t *ath, int sample_rate)
Definition: hcadec.c:66
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:485
AV_TX_FLOAT_MDCT
@ AV_TX_FLOAT_MDCT
Standard MDCT with sample data type of float and a scale type of float.
Definition: tx.h:61
HCAContext::total_band_count
uint8_t total_band_count
Definition: hcadec.c:56
HCAContext::tx_fn
av_tx_fn tx_fn
Definition: hcadec.c:61
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
scale_conversion_table
static const float scale_conversion_table[]
Definition: hca_data.h:91
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
quant_spectrum_bits
static const uint8_t quant_spectrum_bits[]
Definition: hca_data.h:29
get_bits.h
HCAContext::ath_type
int ath_type
Definition: hcadec.c:52
ath
static av_cold float ath(float f, float add)
Calculate ATH value for given frequency.
Definition: aacpsy.c:292
quant_spectrum_value
static const int8_t quant_spectrum_value[]
Definition: hca_data.h:41
AV_CRC_16_ANSI
@ AV_CRC_16_ANSI
Definition: crc.h:50
ChannelContext::chan_type
int chan_type
Definition: hcadec.c:40
HCAContext::ath
uint8_t ath[128]
Definition: hcadec.c:50
av_clip_intp2
#define av_clip_intp2
Definition: common.h:117
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: hcadec.c:105
ChannelContext::imdct_out
float imdct_out[128]
Definition: hcadec.c:33
quant_step_size
static const float quant_step_size[]
Definition: hca_data.h:125
HCAContext::fdsp
AVFloatDSPContext * fdsp
Definition: hcadec.c:63
c
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
float_dsp.h
ath_init
static int ath_init(uint8_t *ath, int type, int sample_rate)
Definition: hcadec.c:84
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1652
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:374
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
dequantizer_scaling_table
static const float dequantizer_scaling_table[]
Definition: hca_data.h:113
HCAContext::stereo_band_count
uint8_t stereo_band_count
Definition: hcadec.c:58
scale_table
static const uint8_t scale_table[]
Definition: hca_data.h:53
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1000
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
reconstruct_hfr
static void reconstruct_hfr(HCAContext *s, ChannelContext *ch, unsigned hfr_group_count, unsigned bands_per_hfr_group, unsigned start_band, unsigned total_band_count)
Definition: hcadec.c:285
AVFloatDSPContext
Definition: float_dsp.h:24
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
av_crc_get_table
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:374
version
version
Definition: libkvazaar.c:307
HCAContext::base_band_count
uint8_t base_band_count
Definition: hcadec.c:57
av_tx_uninit
av_cold void av_tx_uninit(AVTXContext **ctx)
Frees a context and sets ctx to NULL, does nothing when ctx == NULL.
Definition: tx.c:213
HCAContext::crc_table
const AVCRC * crc_table
Definition: hcadec.c:46
decode_close
static av_cold int decode_close(AVCodecContext *avctx)
Definition: hcadec.c:438
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:993
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:116
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
ChannelContext::scale
uint8_t scale[128]
Definition: hcadec.c:36
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:484
hca_data.h
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
delta
float delta
Definition: vorbis_enc_data.h:430
value
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 default value
Definition: writing_filters.txt:86
ath_base_curve
static const uint8_t ath_base_curve[656]
Definition: hca_data.h:131
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:209
max_bits_table
static const uint8_t max_bits_table[]
Definition: hca_data.h:25
avcodec.h
ChannelContext::count
unsigned count
Definition: hcadec.c:39
HCAContext::track_count
uint8_t track_count
Definition: hcadec.c:54
ret
ret
Definition: filter_design.txt:187
frame
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
Definition: filter_design.txt:264
AV_EF_CRCCHECK
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Definition: avcodec.h:1332
ceil2
static unsigned ceil2(unsigned a, unsigned b)
Definition: hcadec.c:100
HCAContext
Definition: hcadec.c:43
ChannelContext::intensity
int8_t intensity[8]
Definition: hcadec.c:37
AVCodecContext
main external API structure.
Definition: avcodec.h:383
c2
static const uint64_t c2
Definition: murmur3.c:52
av_crc
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:392
HCAContext::ch
ChannelContext ch[16]
Definition: hcadec.c:48
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
ChannelContext::imdct_in
float imdct_in[128]
Definition: hcadec.c:32
ChannelContext
Definition: hcadec.c:30
ChannelContext::scale_factors
int8_t scale_factors[128]
Definition: hcadec.c:35
factor
static const int factor[16]
Definition: vf_pp7.c:76
dequantize_coefficients
static void dequantize_coefficients(HCAContext *c, ChannelContext *ch)
Definition: hcadec.c:303
HCAContext::channel_config
uint8_t channel_config
Definition: hcadec.c:55
get_bitsz
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
Definition: get_bits.h:416
AV_CODEC_FLAG_BITEXACT
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:272
intensity_ratio_table
static const float intensity_ratio_table[]
Definition: hca_data.h:85
HCAContext::tx_ctx
AVTXContext * tx_ctx
Definition: hcadec.c:62
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:410
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
HCAContext::gb
GetBitContext gb
Definition: hcadec.c:44
avpriv_float_dsp_alloc
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
Definition: float_dsp.c:135
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
decode_frame
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: hcadec.c:389
scale_conv_bias
static const int scale_conv_bias
Definition: hca_data.h:111
AV_CODEC_ID_HCA
@ AV_CODEC_ID_HCA
Definition: codec_id.h:516
run_imdct
static void run_imdct(HCAContext *c, ChannelContext *ch, int index, float *out)
Definition: hcadec.c:257
tx.h