FFmpeg
mpc7.c
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1 /*
2  * Musepack SV7 decoder
3  * Copyright (c) 2006 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 
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/lfg.h"
31 #include "libavutil/mem_internal.h"
32 #include "libavutil/thread.h"
33 
34 #include "avcodec.h"
35 #include "codec_internal.h"
36 #include "decode.h"
37 #include "get_bits.h"
38 #include "mpegaudiodsp.h"
39 
40 #include "mpc.h"
41 #include "mpc7data.h"
42 
43 static VLCElem scfi_vlc[1 << MPC7_SCFI_BITS];
44 static VLCElem dscf_vlc[1 << MPC7_DSCF_BITS];
45 static VLCElem hdr_vlc [1 << MPC7_HDR_BITS];
46 static const VLCElem *quant_vlc[MPC7_QUANT_VLC_TABLES][2];
47 
48 static av_cold void mpc7_init_static(void)
49 {
50  static VLCElem quant_tables[7224];
51  VLCInitState state = VLC_INIT_STATE(quant_tables);
52  const uint8_t *raw_quant_table = mpc7_quant_vlcs;
53 
54  VLC_INIT_STATIC_TABLE_FROM_LENGTHS(scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
55  &mpc7_scfi[1], 2,
56  &mpc7_scfi[0], 2, 1, 0, 0);
57  VLC_INIT_STATIC_TABLE_FROM_LENGTHS(dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
58  &mpc7_dscf[1], 2,
59  &mpc7_dscf[0], 2, 1, -7, 0);
60  VLC_INIT_STATIC_TABLE_FROM_LENGTHS(hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
61  &mpc7_hdr[1], 2,
62  &mpc7_hdr[0], 2, 1, -5, 0);
63  for (int i = 0; i < MPC7_QUANT_VLC_TABLES; i++) {
64  for (int j = 0; j < 2; j++) {
65  quant_vlc[i][j] =
66  ff_vlc_init_tables_from_lengths(&state, 9, mpc7_quant_vlc_sizes[i],
67  &raw_quant_table[1], 2,
68  &raw_quant_table[0], 2, 1,
69  mpc7_quant_vlc_off[i], 0);
70  raw_quant_table += 2 * mpc7_quant_vlc_sizes[i];
71  }
72  }
73  ff_mpa_synth_init_fixed();
74 }
75 
76 static av_cold int mpc7_decode_init(AVCodecContext * avctx)
77 {
78  static AVOnce init_static_once = AV_ONCE_INIT;
79  MPCContext *c = avctx->priv_data;
80  GetBitContext gb;
81  LOCAL_ALIGNED_16(uint8_t, buf, [16]);
82 
83  /* Musepack SV7 is always stereo */
84  if (avctx->ch_layout.nb_channels != 2) {
85  avpriv_request_sample(avctx, "%d channels", avctx->ch_layout.nb_channels);
86  return AVERROR_PATCHWELCOME;
87  }
88 
89  if(avctx->extradata_size < 16){
90  av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
91  return AVERROR_INVALIDDATA;
92  }
93  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
94  av_lfg_init(&c->rnd, 0xDEADBEEF);
95  ff_bswapdsp_init(&c->bdsp);
96  ff_mpadsp_init(&c->mpadsp);
97  c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
98  init_get_bits(&gb, buf, 128);
99 
100  c->IS = get_bits1(&gb);
101  c->MSS = get_bits1(&gb);
102  c->maxbands = get_bits(&gb, 6);
103  if(c->maxbands >= BANDS){
104  av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
105  return AVERROR_INVALIDDATA;
106  }
107  skip_bits_long(&gb, 88);
108  c->gapless = get_bits1(&gb);
109  c->lastframelen = get_bits(&gb, 11);
110  av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
111  c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
112  c->frames_to_skip = 0;
113 
114  avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
115  av_channel_layout_uninit(&avctx->ch_layout);
116  avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
117 
118  ff_thread_once(&init_static_once, mpc7_init_static);
119 
120  return 0;
121 }
122 
123 /**
124  * Fill samples for given subband
125  */
126 static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
127 {
128  int i, i1, t;
129  switch(idx){
130  case -1:
131  for(i = 0; i < SAMPLES_PER_BAND; i++){
132  *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
133  }
134  break;
135  case 1:
136  i1 = get_bits1(gb);
137  for(i = 0; i < SAMPLES_PER_BAND/3; i++){
138  t = get_vlc2(gb, quant_vlc[0][i1], 9, 2);
139  *dst++ = mpc7_idx30[t];
140  *dst++ = mpc7_idx31[t];
141  *dst++ = mpc7_idx32[t];
142  }
143  break;
144  case 2:
145  i1 = get_bits1(gb);
146  for(i = 0; i < SAMPLES_PER_BAND/2; i++){
147  t = get_vlc2(gb, quant_vlc[1][i1], 9, 2);
148  *dst++ = mpc7_idx50[t];
149  *dst++ = mpc7_idx51[t];
150  }
151  break;
152  case 3: case 4: case 5: case 6: case 7:
153  i1 = get_bits1(gb);
154  for(i = 0; i < SAMPLES_PER_BAND; i++)
155  *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1], 9, 2);
156  break;
157  case 8: case 9: case 10: case 11: case 12:
158  case 13: case 14: case 15: case 16: case 17:
159  t = (1 << (idx - 2)) - 1;
160  for(i = 0; i < SAMPLES_PER_BAND; i++)
161  *dst++ = get_bits(gb, idx - 1) - t;
162  break;
163  default: // case 0 and -2..-17
164  return;
165  }
166 }
167 
168 static int get_scale_idx(GetBitContext *gb, int ref)
169 {
170  int t = get_vlc2(gb, dscf_vlc, MPC7_DSCF_BITS, 1);
171  if (t == 8)
172  return get_bits(gb, 6);
173  return ref + t;
174 }
175 
176 static int mpc7_decode_frame(AVCodecContext *avctx, AVFrame *frame,
177  int *got_frame_ptr, AVPacket *avpkt)
178 {
179  const uint8_t *buf = avpkt->data;
180  int buf_size;
181  MPCContext *c = avctx->priv_data;
182  GetBitContext gb;
183  int i, ch;
184  int mb = -1;
185  Band *bands = c->bands;
186  int off, ret, last_frame, skip;
187  int bits_used, bits_avail;
188 
189  memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
190 
191  buf_size = avpkt->size & ~3;
192  if (buf_size <= 0) {
193  av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
194  avpkt->size);
195  return AVERROR_INVALIDDATA;
196  }
197  if (buf_size != avpkt->size) {
198  av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
199  "extra bytes at the end will be skipped.\n");
200  }
201 
202  skip = buf[0];
203  last_frame = buf[1];
204  buf += 4;
205  buf_size -= 4;
206 
207  /* get output buffer */
208  frame->nb_samples = MPC_FRAME_SIZE;
209  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
210  return ret;
211 
212  av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
213  if (!c->bits)
214  return AVERROR(ENOMEM);
215  c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
216  buf_size >> 2);
217  if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0)
218  return ret;
219  skip_bits_long(&gb, skip);
220 
221  /* read subband indexes */
222  for(i = 0; i <= c->maxbands; i++){
223  for(ch = 0; ch < 2; ch++){
224  int t = i ? get_vlc2(&gb, hdr_vlc, MPC7_HDR_BITS, 1) : 4;
225  if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
226  else bands[i].res[ch] = bands[i-1].res[ch] + t;
227  if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
228  av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
229  return AVERROR_INVALIDDATA;
230  }
231  }
232 
233  if(bands[i].res[0] || bands[i].res[1]){
234  mb = i;
235  if(c->MSS) bands[i].msf = get_bits1(&gb);
236  }
237  }
238  /* get scale indexes coding method */
239  for(i = 0; i <= mb; i++)
240  for(ch = 0; ch < 2; ch++)
241  if (bands[i].res[ch])
242  bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc, MPC7_SCFI_BITS, 1);
243  /* get scale indexes */
244  for(i = 0; i <= mb; i++){
245  for(ch = 0; ch < 2; ch++){
246  if(bands[i].res[ch]){
247  bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
248  bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
249  switch(bands[i].scfi[ch]){
250  case 0:
251  bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
252  bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
253  break;
254  case 1:
255  bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
256  bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
257  break;
258  case 2:
259  bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
260  bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
261  break;
262  case 3:
263  bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
264  break;
265  }
266  c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
267  }
268  }
269  }
270  /* get quantizers */
271  memset(c->Q, 0, sizeof(c->Q));
272  off = 0;
273  for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
274  for(ch = 0; ch < 2; ch++)
275  idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
276 
277  ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
278  if(last_frame)
279  frame->nb_samples = c->lastframelen;
280 
281  bits_used = get_bits_count(&gb);
282  bits_avail = buf_size * 8;
283  if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
284  av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
285  return AVERROR_INVALIDDATA;
286  }
287  if(c->frames_to_skip){
288  c->frames_to_skip--;
289  *got_frame_ptr = 0;
290  return avpkt->size;
291  }
292 
293  *got_frame_ptr = 1;
294 
295  return avpkt->size;
296 }
297 
298 static void mpc7_decode_flush(AVCodecContext *avctx)
299 {
300  MPCContext *c = avctx->priv_data;
301 
302  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
303  c->frames_to_skip = 32;
304 }
305 
306 static av_cold int mpc7_decode_close(AVCodecContext *avctx)
307 {
308  MPCContext *c = avctx->priv_data;
309  av_freep(&c->bits);
310  c->buf_size = 0;
311  return 0;
312 }
313 
314 const FFCodec ff_mpc7_decoder = {
315  .p.name = "mpc7",
316  CODEC_LONG_NAME("Musepack SV7"),
317  .p.type = AVMEDIA_TYPE_AUDIO,
318  .p.id = AV_CODEC_ID_MUSEPACK7,
319  .priv_data_size = sizeof(MPCContext),
320  .init = mpc7_decode_init,
321  .close = mpc7_decode_close,
322  FF_CODEC_DECODE_CB(mpc7_decode_frame),
323  .flush = mpc7_decode_flush,
324  .p.capabilities = AV_CODEC_CAP_DR1,
325  .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
326  AV_SAMPLE_FMT_NONE },
327 };
MPC7_SCFI_BITS
#define MPC7_SCFI_BITS
Definition: mpc7data.h:34
mpc7_scfi
static const uint8_t mpc7_scfi[MPC7_SCFI_SIZE *2]
Definition: mpc7data.h:35
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:278
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
mpc7_decode_frame
static int mpc7_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
Definition: mpc7.c:176
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
ff_mpc7_decoder
const FFCodec ff_mpc7_decoder
Definition: mpc7.c:314
mem_internal.h
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:379
av_lfg_init
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:32
thread.h
quant_vlc
static const VLCElem * quant_vlc[MPC7_QUANT_VLC_TABLES][2]
Definition: mpc7.c:46
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:266
hdr_vlc
static VLCElem hdr_vlc[1<< MPC7_HDR_BITS]
Definition: mpc7.c:45
ff_mpadsp_init
av_cold void ff_mpadsp_init(MPADSPContext *s)
Definition: mpegaudiodsp.c:81
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:344
AVPacket::data
uint8_t * data
Definition: packet.h:522
MPCContext
Definition: mpc.h:54
FFCodec
Definition: codec_internal.h:127
mpc7_decode_close
static av_cold int mpc7_decode_close(AVCodecContext *avctx)
Definition: mpc7.c:306
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
MPC7_HDR_BITS
#define MPC7_HDR_BITS
Definition: mpc7data.h:47
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:514
mpc7_hdr
static const uint8_t mpc7_hdr[MPC7_HDR_SIZE *2]
Definition: mpc7data.h:48
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:1065
GetBitContext
Definition: get_bits.h:108
ff_mpc_dequantize_and_synth
void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels)
Definition: mpc.c:55
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:205
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
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:545
VLCInitState
For static VLCs, the number of bits can often be hardcoded at each get_vlc2() callsite.
Definition: vlc.h:209
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:524
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:287
av_lfg_get
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:53
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
mpc7_idx32
static const int8_t mpc7_idx32[]
Definition: mpc7data.h:29
lfg.h
LOCAL_ALIGNED_16
#define LOCAL_ALIGNED_16(t, v,...)
Definition: mem_internal.h:150
mpc7_decode_flush
static void mpc7_decode_flush(AVCodecContext *avctx)
Definition: mpc7.c:298
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
decode.h
get_bits.h
bands
static const float bands[]
Definition: af_superequalizer.c:56
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:272
frame
static AVFrame * frame
Definition: demux_decode.c:54
mpc.h
dscf_vlc
static VLCElem dscf_vlc[1<< MPC7_DSCF_BITS]
Definition: mpc7.c:44
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:203
ff_bswapdsp_init
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
ff_mpa_synth_init_fixed
void ff_mpa_synth_init_fixed(void)
mpc7_idx51
static const int8_t mpc7_idx51[]
Definition: mpc7data.h:31
mpc7_quant_vlcs
static const uint8_t mpc7_quant_vlcs[177 *2 *2]
Definition: mpc7data.h:62
MPC_FRAME_SIZE
#define MPC_FRAME_SIZE
Definition: mpc.h:43
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:388
MPC7_HDR_SIZE
#define MPC7_HDR_SIZE
Definition: mpc7data.h:46
mpc7_init_static
static av_cold void mpc7_init_static(void)
Definition: mpc7.c:48
state
static struct @385 state
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:652
AVOnce
#define AVOnce
Definition: thread.h:202
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
MPC7_QUANT_VLC_TABLES
#define MPC7_QUANT_VLC_TABLES
Definition: mpc7data.h:53
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1569
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:365
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:523
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:303
codec_internal.h
SAMPLES_PER_BAND
#define SAMPLES_PER_BAND
Definition: mpc.h:42
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1057
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
VLCElem
Definition: vlc.h:32
MPC7_SCFI_SIZE
#define MPC7_SCFI_SIZE
Definition: mpc7data.h:33
mpc7_quant_vlc_sizes
static const uint8_t mpc7_quant_vlc_sizes[MPC7_QUANT_VLC_TABLES]
Definition: mpc7data.h:54
mb
#define mb
Definition: vf_colormatrix.c:99
AV_SAMPLE_FMT_S16P
@ AV_SAMPLE_FMT_S16P
signed 16 bits, planar
Definition: samplefmt.h:64
get_scale_idx
static int get_scale_idx(GetBitContext *gb, int ref)
Definition: mpc7.c:168
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:424
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
mpc7_idx31
static const int8_t mpc7_idx31[]
Definition: mpc7data.h:28
mpc7data.h
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:523
internal.h
AVFrame::extended_data
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:405
BANDS
#define BANDS
Definition: imc.c:56
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
av_fast_padded_malloc
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:52
mpc7_decode_init
static av_cold int mpc7_decode_init(AVCodecContext *avctx)
Definition: mpc7.c:76
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
scfi_vlc
static VLCElem scfi_vlc[1<< MPC7_SCFI_BITS]
Definition: mpc7.c:43
avcodec.h
mpc7_idx30
static const int8_t mpc7_idx30[]
Definition: mpc7data.h:27
ret
ret
Definition: filter_design.txt:187
mpc7_dscf
static const uint8_t mpc7_dscf[MPC7_DSCF_SIZE *2]
Definition: mpc7data.h:41
AVCodecContext
main external API structure.
Definition: avcodec.h:445
mpc7_idx50
static const int8_t mpc7_idx50[]
Definition: mpc7data.h:30
channel_layout.h
Band
Subband structure - hold all variables for each subband.
Definition: mpc.h:46
av_channel_layout_uninit
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
Definition: channel_layout.c:432
MPC7_DSCF_BITS
#define MPC7_DSCF_BITS
Definition: mpc7data.h:40
MPC7_DSCF_SIZE
#define MPC7_DSCF_SIZE
Definition: mpc7data.h:39
ref
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:112
ff_vlc_init_tables_from_lengths
const av_cold VLCElem * ff_vlc_init_tables_from_lengths(VLCInitState *state, 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)
Definition: vlc.c:366
mpegaudiodsp.h
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
VLC_INIT_STATIC_TABLE_FROM_LENGTHS
#define VLC_INIT_STATIC_TABLE_FROM_LENGTHS(vlc_table, nb_bits, nb_codes, lens, lens_wrap, syms, syms_wrap, syms_size, offset, flags)
Definition: vlc.h:277
VLC_INIT_STATE
#define VLC_INIT_STATE(_table)
Definition: vlc.h:214
AVPacket
This structure stores compressed data.
Definition: packet.h:499
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
quant_tables
static const uint8_t quant_tables[]
Definition: vorbis_enc_data.h:395
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
idx_to_quant
static void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
Fill samples for given subband.
Definition: mpc7.c:126
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
AV_CODEC_ID_MUSEPACK7
@ AV_CODEC_ID_MUSEPACK7
Definition: codec_id.h:468
skip
static void BS_FUNC() skip(BSCTX *bc, unsigned int n)
Skip n bits in the buffer.
Definition: bitstream_template.h:375
mpc7_quant_vlc_off
static const int8_t mpc7_quant_vlc_off[MPC7_QUANT_VLC_TABLES]
Definition: mpc7data.h:58
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