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/tx.h"
23 
24 #include "avcodec.h"
25 #include "get_bits.h"
26 #include "internal.h"
27 #include "hca_data.h"
28 
29 typedef struct ChannelContext {
30  float base[128];
31  DECLARE_ALIGNED(32, float, imdct_in)[128];
32  DECLARE_ALIGNED(32, float, imdct_out)[128];
33  DECLARE_ALIGNED(32, float, imdct_prev)[128];
34  int8_t scale_factors[128];
35  uint8_t scale[128];
36  int8_t intensity[8];
37  int8_t *hfr_scale;
38  unsigned count;
39  int chan_type;
41 
42 typedef struct HCAContext {
44 
45  const AVCRC *crc_table;
46 
48 
49  uint8_t ath[128];
50 
51  int ath_type;
52  unsigned hfr_group_count;
59 
63 } HCAContext;
64 
65 static void ath_init1(uint8_t *ath, int sample_rate)
66 {
67  unsigned int index;
68  unsigned int acc = 0;
69 
70  for (int i = 0; i < 128; i++) {
71  acc += sample_rate;
72  index = acc >> 13;
73 
74  if (index >= 654) {
75  memset(ath+i, 0xFF, (128 - i));
76  break;
77  }
78 
79  ath[i] = ath_base_curve[index];
80  }
81 }
82 
83 static int ath_init(uint8_t *ath, int type, int sample_rate)
84 {
85  switch (type) {
86  case 0:
87  /* nothing to do */
88  break;
89  case 1:
90  ath_init1(ath, sample_rate);
91  break;
92  default:
93  return AVERROR_INVALIDDATA;
94  }
95 
96  return 0;
97 }
98 
99 static inline unsigned ceil2(unsigned a, unsigned b)
100 {
101  return (b > 0) ? (a / b + ((a % b) ? 1 : 0)) : 0;
102 }
103 
105 {
106  HCAContext *c = avctx->priv_data;
107  GetBitContext *gb = &c->gb;
108  int8_t r[16] = { 0 };
109  float scale = 1.f / 8.f;
110  unsigned b, chunk;
111  int version, ret;
112 
115 
116  if (avctx->channels <= 0 || avctx->channels > 16)
117  return AVERROR(EINVAL);
118 
119  ret = init_get_bits8(gb, avctx->extradata, avctx->extradata_size);
120  if (ret < 0)
121  return ret;
122  skip_bits_long(gb, 32);
123  version = get_bits(gb, 16);
124  skip_bits_long(gb, 16);
125 
126  c->ath_type = version >= 0x200 ? 0 : 1;
127 
128  if (get_bits_long(gb, 32) != MKBETAG('f', 'm', 't', 0))
129  return AVERROR_INVALIDDATA;
130  skip_bits_long(gb, 32);
131  skip_bits_long(gb, 32);
132  skip_bits_long(gb, 32);
133 
134  chunk = get_bits_long(gb, 32);
135  if (chunk == MKBETAG('c', 'o', 'm', 'p')) {
136  skip_bits_long(gb, 16);
137  skip_bits_long(gb, 8);
138  skip_bits_long(gb, 8);
139  c->track_count = get_bits(gb, 8);
140  c->channel_config = get_bits(gb, 8);
141  c->total_band_count = get_bits(gb, 8);
142  c->base_band_count = get_bits(gb, 8);
143  c->stereo_band_count = get_bits(gb, 8);
144  c->bands_per_hfr_group = get_bits(gb, 8);
145  } else if (chunk == MKBETAG('d', 'e', 'c', 0)) {
146  skip_bits_long(gb, 16);
147  skip_bits_long(gb, 8);
148  skip_bits_long(gb, 8);
149  c->total_band_count = get_bits(gb, 8) + 1;
150  c->base_band_count = get_bits(gb, 8) + 1;
151  c->track_count = get_bits(gb, 4);
152  c->channel_config = get_bits(gb, 4);
153  if (!get_bits(gb, 8))
156  c->bands_per_hfr_group = 0;
157  } else
158  return AVERROR_INVALIDDATA;
159 
161  return AVERROR_INVALIDDATA;
162 
163 
164  while (get_bits_left(gb) >= 32) {
165  chunk = get_bits_long(gb, 32);
166  if (chunk == MKBETAG('v', 'b', 'r', 0)) {
167  skip_bits_long(gb, 16);
168  skip_bits_long(gb, 16);
169  } else if (chunk == MKBETAG('a', 't', 'h', 0)) {
170  c->ath_type = get_bits(gb, 16);
171  } else if (chunk == MKBETAG('r', 'v', 'a', 0)) {
172  skip_bits_long(gb, 32);
173  } else if (chunk == MKBETAG('c', 'o', 'm', 'm')) {
174  skip_bits_long(gb, get_bits(gb, 8) * 8);
175  } else if (chunk == MKBETAG('c', 'i', 'p', 'h')) {
176  skip_bits_long(gb, 16);
177  } else if (chunk == MKBETAG('l', 'o', 'o', 'p')) {
178  skip_bits_long(gb, 32);
179  skip_bits_long(gb, 32);
180  skip_bits_long(gb, 16);
181  skip_bits_long(gb, 16);
182  } else if (chunk == MKBETAG('p', 'a', 'd', 0)) {
183  break;
184  } else {
185  break;
186  }
187  }
188 
189  ret = ath_init(c->ath, c->ath_type, avctx->sample_rate);
190  if (ret < 0)
191  return ret;
192 
193  if (!c->track_count)
194  c->track_count = 1;
195 
196  b = avctx->channels / c->track_count;
197  if (c->stereo_band_count && b > 1) {
198  int8_t *x = r;
199 
200  for (int i = 0; i < c->track_count; i++, x+=b) {
201  switch (b) {
202  case 2:
203  case 3:
204  x[0] = 1;
205  x[1] = 2;
206  break;
207  case 4:
208  x[0]=1; x[1] = 2;
209  if (c->channel_config == 0) {
210  x[2]=1;
211  x[3]=2;
212  }
213  break;
214  case 5:
215  x[0]=1; x[1] = 2;
216  if (c->channel_config <= 2) {
217  x[3]=1;
218  x[4]=2;
219  }
220  break;
221  case 6:
222  case 7:
223  x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2;
224  break;
225  case 8:
226  x[0] = 1; x[1] = 2; x[4] = 1; x[5] = 2; x[6] = 1; x[7] = 2;
227  break;
228  }
229  }
230  }
231 
232  if (c->total_band_count < c->base_band_count)
233  return AVERROR_INVALIDDATA;
234 
237 
238  if (c->base_band_count + c->stereo_band_count + (unsigned long)c->hfr_group_count > 128ULL)
239  return AVERROR_INVALIDDATA;
240 
241  for (int i = 0; i < avctx->channels; i++) {
242  c->ch[i].chan_type = r[i];
243  c->ch[i].count = c->base_band_count + ((r[i] != 2) ? c->stereo_band_count : 0);
245  if (c->ch[i].count > 128)
246  return AVERROR_INVALIDDATA;
247  }
248 
250  if (!c->fdsp)
251  return AVERROR(ENOMEM);
252 
253  return av_tx_init(&c->tx_ctx, &c->tx_fn, AV_TX_FLOAT_MDCT, 1, 128, &scale, 0);
254 }
255 
256 static void run_imdct(HCAContext *c, ChannelContext *ch, int index, float *out)
257 {
258  c->tx_fn(c->tx_ctx, ch->imdct_out, ch->imdct_in, sizeof(float));
259 
260  c->fdsp->vector_fmul_window(out, ch->imdct_prev + (128 >> 1),
261  ch->imdct_out, window, 128 >> 1);
262 
263  memcpy(ch->imdct_prev, ch->imdct_out, 128 * sizeof(float));
264 }
265 
267  int index, unsigned band_count, unsigned base_band_count,
268  unsigned stereo_band_count)
269 {
270  float ratio_l = intensity_ratio_table[ch2->intensity[index]];
271  float ratio_r = ratio_l - 2.0f;
272  float *c1 = &ch1->imdct_in[base_band_count];
273  float *c2 = &ch2->imdct_in[base_band_count];
274 
275  if (ch1->chan_type != 1 || !stereo_band_count)
276  return;
277 
278  for (int i = 0; i < band_count; i++) {
279  *(c2++) = *c1 * ratio_r;
280  *(c1++) *= ratio_l;
281  }
282 }
283 
285  unsigned hfr_group_count,
286  unsigned bands_per_hfr_group,
287  unsigned start_band, unsigned total_band_count)
288 {
289  if (ch->chan_type == 2 || !bands_per_hfr_group)
290  return;
291 
292  for (int i = 0, k = start_band, l = start_band - 1; i < hfr_group_count; i++){
293  for (int j = 0; j < bands_per_hfr_group && k < total_band_count && l >= 0; j++, k++, l--){
295  av_clip_intp2(ch->hfr_scale[i] - ch->scale_factors[l], 6) ] * ch->imdct_in[l];
296  }
297  }
298 
299  ch->imdct_in[127] = 0;
300 }
301 
303 {
304  GetBitContext *gb = &c->gb;
305 
306  for (int i = 0; i < ch->count; i++) {
307  unsigned scale = ch->scale[i];
308  int nb_bits = max_bits_table[scale];
309  int value = get_bitsz(gb, nb_bits);
310  float factor;
311 
312  if (scale > 7) {
313  value = (1 - ((value & 1) << 1)) * (value >> 1);
314  if (!value)
315  skip_bits_long(gb, -1);
316  factor = value;
317  } else {
318  value += scale << 4;
319  skip_bits_long(gb, quant_spectrum_bits[value] - nb_bits);
320  factor = quant_spectrum_value[value];
321  }
322  ch->imdct_in[i] = factor * ch->base[i];
323  }
324 
325  memset(ch->imdct_in + ch->count, 0, sizeof(ch->imdct_in) - ch->count * sizeof(ch->imdct_in[0]));
326 }
327 
328 static void unpack(HCAContext *c, ChannelContext *ch,
329  unsigned hfr_group_count,
330  int packed_noise_level,
331  const uint8_t *ath)
332 {
333  GetBitContext *gb = &c->gb;
334  int delta_bits = get_bits(gb, 3);
335 
336  if (delta_bits > 5) {
337  for (int i = 0; i < ch->count; i++)
338  ch->scale_factors[i] = get_bits(gb, 6);
339  } else if (delta_bits) {
340  int factor = get_bits(gb, 6);
341  int max_value = (1 << delta_bits) - 1;
342  int half_max = max_value >> 1;
343 
344  ch->scale_factors[0] = factor;
345  for (int i = 1; i < ch->count; i++){
346  int delta = get_bits(gb, delta_bits);
347 
348  if (delta == max_value) {
349  factor = get_bits(gb, 6);
350  } else {
351  factor += delta - half_max;
352  }
353  factor = av_clip_uintp2(factor, 6);
354 
355  ch->scale_factors[i] = factor;
356  }
357  } else {
358  memset(ch->scale_factors, 0, 128);
359  }
360 
361  if (ch->chan_type == 2){
362  ch->intensity[0] = get_bits(gb, 4);
363  if (ch->intensity[0] < 15) {
364  for (int i = 1; i < 8; i++)
365  ch->intensity[i] = get_bits(gb, 4);
366  }
367  } else {
368  for (int i = 0; i < hfr_group_count; i++)
369  ch->hfr_scale[i] = get_bits(gb, 6);
370  }
371 
372  for (int i = 0; i < ch->count; i++) {
373  int scale = ch->scale_factors[i];
374 
375  if (scale) {
376  scale = c->ath[i] + ((packed_noise_level + i) >> 8) - ((scale * 5) >> 1) + 2;
377  scale = scale_table[av_clip(scale, 0, 58)];
378  }
379  ch->scale[i] = scale;
380  }
381 
382  memset(ch->scale + ch->count, 0, sizeof(ch->scale) - ch->count);
383 
384  for (int i = 0; i < ch->count; i++)
386 }
387 
388 static int decode_frame(AVCodecContext *avctx, void *data,
389  int *got_frame_ptr, AVPacket *avpkt)
390 {
391  AVFrame *frame = data;
392  HCAContext *c = avctx->priv_data;
393  int ch, ret, packed_noise_level;
394  GetBitContext *gb = &c->gb;
395  float **samples;
396 
397  if (avctx->err_recognition & AV_EF_CRCCHECK) {
398  if (av_crc(c->crc_table, 0, avpkt->data, avpkt->size))
399  return AVERROR_INVALIDDATA;
400  }
401 
402  if ((ret = init_get_bits8(gb, avpkt->data, avpkt->size)) < 0)
403  return ret;
404 
405  if (get_bits(gb, 16) != 0xFFFF)
406  return AVERROR_INVALIDDATA;
407 
408  frame->nb_samples = 1024;
409  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
410  return ret;
411  samples = (float **)frame->extended_data;
412 
413  packed_noise_level = (get_bits(gb, 9) << 8) - get_bits(gb, 7);
414 
415  for (ch = 0; ch < avctx->channels; ch++)
416  unpack(c, &c->ch[ch], c->hfr_group_count, packed_noise_level, c->ath);
417 
418  for (int i = 0; i < 8; i++) {
419  for (ch = 0; ch < avctx->channels; ch++)
420  dequantize_coefficients(c, &c->ch[ch]);
421  for (ch = 0; ch < avctx->channels; ch++)
424  for (ch = 0; ch < avctx->channels - 1; ch++)
425  apply_intensity_stereo(c, &c->ch[ch], &c->ch[ch+1], i,
428  for (ch = 0; ch < avctx->channels; ch++)
429  run_imdct(c, &c->ch[ch], i, samples[ch] + i * 128);
430  }
431 
432  *got_frame_ptr = 1;
433 
434  return avpkt->size;
435 }
436 
438 {
439  HCAContext *c = avctx->priv_data;
440 
441  av_freep(&c->fdsp);
442  av_tx_uninit(&c->tx_ctx);
443 
444  return 0;
445 }
446 
448  .name = "hca",
449  .long_name = NULL_IF_CONFIG_SMALL("CRI HCA"),
450  .type = AVMEDIA_TYPE_AUDIO,
451  .id = AV_CODEC_ID_HCA,
452  .priv_data_size = sizeof(HCAContext),
453  .init = decode_init,
454  .decode = decode_frame,
455  .close = decode_close,
456  .capabilities = AV_CODEC_CAP_DR1,
457  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
459 };
float, planar
Definition: samplefmt.h:69
av_cold void av_tx_uninit(AVTXContext **ctx)
Frees a context and sets ctx to NULL, does nothing when ctx == NULL.
Definition: tx.c:110
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
version
Definition: libkvazaar.c:317
static const int scale_conv_bias
Definition: hca_data.h:111
This structure describes decoded (raw) audio or video data.
Definition: frame.h:308
float imdct_in[128]
Definition: hcadec.c:31
uint8_t ath[128]
Definition: hcadec.c:49
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
static const float dequantizer_scaling_table[]
Definition: hca_data.h:113
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
uint8_t stereo_band_count
Definition: hcadec.c:57
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:291
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static const int8_t quant_spectrum_value[]
Definition: hca_data.h:41
int acc
Definition: yuv2rgb.c:555
int size
Definition: packet.h:364
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:266
float imdct_out[128]
Definition: hcadec.c:32
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:36
GLint GLenum type
Definition: opengl_enc.c:104
static av_cold float ath(float f, float add)
Calculate ATH value for given frequency.
Definition: aacpsy.c:292
static const float quant_step_size[]
Definition: hca_data.h:125
AVCodec.
Definition: codec.h:190
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
int8_t scale_factors[128]
Definition: hcadec.c:34
av_tx_fn tx_fn
Definition: hcadec.c:60
static const float scale_conversion_table[]
Definition: hca_data.h:91
uint8_t total_band_count
Definition: hcadec.c:55
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1194
uint8_t
#define av_cold
Definition: attributes.h:88
static void run_imdct(HCAContext *c, ChannelContext *ch, int index, float *out)
Definition: hcadec.c:256
static const uint8_t quant_spectrum_bits[]
Definition: hca_data.h:29
static const uint8_t ath_base_curve[656]
Definition: hca_data.h:131
float delta
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
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:627
Public header for CRC hash function implementation.
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
uint8_t * data
Definition: packet.h:363
static const uint64_t c1
Definition: murmur3.c:51
bitstream reader API header.
uint8_t bands_per_hfr_group
Definition: hcadec.c:58
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
void(* vector_fmul_window)(float *dst, const float *src0, const float *src1, const float *win, int len)
Overlap/add with window function.
Definition: float_dsp.h:119
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:92
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
Definition: float_dsp.c:135
int8_t intensity[8]
Definition: hcadec.c:36
static void ath_init1(uint8_t *ath, int sample_rate)
Definition: hcadec.c:65
float imdct_prev[128]
Definition: hcadec.c:33
GetBitContext gb
Definition: hcadec.c:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
static av_cold int decode_init(AVCodecContext *avctx)
Definition: hcadec.c:104
const char * r
Definition: vf_curves.c:114
AVTXContext * tx_ctx
Definition: hcadec.c:61
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:606
const char * name
Name of the codec implementation.
Definition: codec.h:197
static const uint8_t scale_table[]
Definition: hca_data.h:53
AVCodec ff_hca_decoder
Definition: hcadec.c:447
unsigned count
Definition: hcadec.c:38
static SDL_Window * window
Definition: ffplay.c:368
int ath_type
Definition: hcadec.c:51
#define b
Definition: input.c:41
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:333
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:1655
int chan_type
Definition: hcadec.c:39
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
uint8_t base_band_count
Definition: hcadec.c:56
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 s(width, name)
Definition: cbs_vp9.c:257
static const float intensity_ratio_table[]
Definition: hca_data.h:85
uint8_t channel_config
Definition: hcadec.c:54
static int ath_init(uint8_t *ath, int type, int sample_rate)
Definition: hcadec.c:83
#define FF_ARRAY_ELEMS(a)
sample_rate
Libavcodec external API header.
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
static av_cold int decode_close(AVCodecContext *avctx)
Definition: hcadec.c:437
int sample_rate
samples per second
Definition: avcodec.h:1186
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
main external API structure.
Definition: avcodec.h:526
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1879
int extradata_size
Definition: avcodec.h:628
static void dequantize_coefficients(HCAContext *c, ChannelContext *ch)
Definition: hcadec.c:302
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: hcadec.c:388
int index
Definition: gxfenc.c:89
static unsigned ceil2(unsigned a, unsigned b)
Definition: hcadec.c:99
ChannelContext ch[16]
Definition: hcadec.c:47
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data...
Definition: avcodec.h:1663
static const int factor[16]
Definition: vf_pp7.c:75
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 Currently power of two lengths from 2 to ...
Definition: tx.c:123
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
int8_t * hfr_scale
Definition: hcadec.c:37
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:374
common internal api header.
static const uint8_t max_bits_table[]
Definition: hca_data.h:25
static void unpack(HCAContext *c, ChannelContext *ch, unsigned hfr_group_count, int packed_noise_level, const uint8_t *ath)
Definition: hcadec.c:328
uint8_t scale[128]
Definition: hcadec.c:35
static const uint64_t c2
Definition: murmur3.c:52
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:284
#define MKBETAG(a, b, c, d)
Definition: common.h:406
void * priv_data
Definition: avcodec.h:553
uint8_t track_count
Definition: hcadec.c:53
Standard MDCT with sample data type of float and a scale type of float.
Definition: tx.h:55
const AVCRC * crc_table
Definition: hcadec.c:45
int channels
number of audio channels
Definition: avcodec.h:1187
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:940
FILE * out
Definition: movenc.c:54
Filter the word “frame” indicates either a video frame or a group of audio samples
#define av_freep(p)
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
AVFloatDSPContext * fdsp
Definition: hcadec.c:62
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:355
float base[128]
Definition: hcadec.c:30
This structure stores compressed data.
Definition: packet.h:340
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:374
uint32_t AVCRC
Definition: crc.h:47
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
int i
Definition: input.c:407
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
Definition: get_bits.h:415
unsigned hfr_group_count
Definition: hcadec.c:52