FFmpeg
mpc7.c
Go to the documentation of this file.
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/attributes.h"
29 #include "libavutil/channel_layout.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/lfg.h"
32 #include "libavutil/mem.h"
33 #include "libavutil/mem_internal.h"
34 #include "libavutil/thread.h"
35 
36 #include "avcodec.h"
37 #include "codec_internal.h"
38 #include "decode.h"
39 #include "get_bits.h"
40 #include "mpegaudiodsp.h"
41 
42 #include "mpc.h"
43 #include "mpc7data.h"
44 
45 static VLCElem scfi_vlc[1 << MPC7_SCFI_BITS];
46 static VLCElem dscf_vlc[1 << MPC7_DSCF_BITS];
47 static VLCElem hdr_vlc [1 << MPC7_HDR_BITS];
48 static const VLCElem *quant_vlc[MPC7_QUANT_VLC_TABLES][2];
49 
50 static av_cold void mpc7_init_static(void)
51 {
52  static VLCElem quant_tables[7224];
53  VLCInitState state = VLC_INIT_STATE(quant_tables);
54  const uint8_t *raw_quant_table = mpc7_quant_vlcs;
55 
56  VLC_INIT_STATIC_TABLE_FROM_LENGTHS(scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
57  &mpc7_scfi[1], 2,
58  &mpc7_scfi[0], 2, 1, 0, 0);
59  VLC_INIT_STATIC_TABLE_FROM_LENGTHS(dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
60  &mpc7_dscf[1], 2,
61  &mpc7_dscf[0], 2, 1, -7, 0);
62  VLC_INIT_STATIC_TABLE_FROM_LENGTHS(hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
63  &mpc7_hdr[1], 2,
64  &mpc7_hdr[0], 2, 1, -5, 0);
65  for (int i = 0; i < MPC7_QUANT_VLC_TABLES; i++) {
66  for (int j = 0; j < 2; j++) {
67  quant_vlc[i][j] =
68  ff_vlc_init_tables_from_lengths(&state, 9, mpc7_quant_vlc_sizes[i],
69  &raw_quant_table[1], 2,
70  &raw_quant_table[0], 2, 1,
71  mpc7_quant_vlc_off[i], 0);
72  raw_quant_table += 2 * mpc7_quant_vlc_sizes[i];
73  }
74  }
75  ff_mpa_synth_init_fixed();
76 }
77 
78 static av_cold int mpc7_decode_init(AVCodecContext * avctx)
79 {
80  static AVOnce init_static_once = AV_ONCE_INIT;
81  MPCContext *c = avctx->priv_data;
82  GetBitContext gb;
83  LOCAL_ALIGNED_16(uint8_t, buf, [16]);
84 
85  /* Musepack SV7 is always stereo */
86  if (avctx->ch_layout.nb_channels != 2) {
87  avpriv_request_sample(avctx, "%d channels", avctx->ch_layout.nb_channels);
88  return AVERROR_PATCHWELCOME;
89  }
90 
91  if(avctx->extradata_size < 16){
92  av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
93  return AVERROR_INVALIDDATA;
94  }
95  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
96  av_lfg_init(&c->rnd, 0xDEADBEEF);
97  ff_bswapdsp_init(&c->bdsp);
98  ff_mpadsp_init(&c->mpadsp);
99  c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
100  init_get_bits(&gb, buf, 128);
101 
102  c->IS = get_bits1(&gb);
103  c->MSS = get_bits1(&gb);
104  c->maxbands = get_bits(&gb, 6);
105  if(c->maxbands >= BANDS){
106  av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
107  return AVERROR_INVALIDDATA;
108  }
109  skip_bits_long(&gb, 88);
110  c->gapless = get_bits1(&gb);
111  c->lastframelen = get_bits(&gb, 11);
112  av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
113  c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
114  c->frames_to_skip = 0;
115 
116  avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
117  av_channel_layout_uninit(&avctx->ch_layout);
118  avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
119 
120  ff_thread_once(&init_static_once, mpc7_init_static);
121 
122  return 0;
123 }
124 
125 /**
126  * Fill samples for given subband
127  */
128 static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
129 {
130  int i, i1, t;
131  switch(idx){
132  case -1:
133  for(i = 0; i < SAMPLES_PER_BAND; i++){
134  *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
135  }
136  break;
137  case 1:
138  i1 = get_bits1(gb);
139  for(i = 0; i < SAMPLES_PER_BAND/3; i++){
140  t = get_vlc2(gb, quant_vlc[0][i1], 9, 2);
141  *dst++ = mpc7_idx30[t];
142  *dst++ = mpc7_idx31[t];
143  *dst++ = mpc7_idx32[t];
144  }
145  break;
146  case 2:
147  i1 = get_bits1(gb);
148  for(i = 0; i < SAMPLES_PER_BAND/2; i++){
149  t = get_vlc2(gb, quant_vlc[1][i1], 9, 2);
150  *dst++ = mpc7_idx50[t];
151  *dst++ = mpc7_idx51[t];
152  }
153  break;
154  case 3: case 4: case 5: case 6: case 7:
155  i1 = get_bits1(gb);
156  for(i = 0; i < SAMPLES_PER_BAND; i++)
157  *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1], 9, 2);
158  break;
159  case 8: case 9: case 10: case 11: case 12:
160  case 13: case 14: case 15: case 16: case 17:
161  t = (1 << (idx - 2)) - 1;
162  for(i = 0; i < SAMPLES_PER_BAND; i++)
163  *dst++ = get_bits(gb, idx - 1) - t;
164  break;
165  default: // case 0 and -2..-17
166  return;
167  }
168 }
169 
170 static int get_scale_idx(GetBitContext *gb, int ref)
171 {
172  int t = get_vlc2(gb, dscf_vlc, MPC7_DSCF_BITS, 1);
173  if (t == 8)
174  return get_bits(gb, 6);
175  return ref + t;
176 }
177 
178 static int mpc7_decode_frame(AVCodecContext *avctx, AVFrame *frame,
179  int *got_frame_ptr, AVPacket *avpkt)
180 {
181  const uint8_t *buf = avpkt->data;
182  int buf_size;
183  MPCContext *c = avctx->priv_data;
184  GetBitContext gb;
185  int i, ch;
186  int mb = -1;
187  Band *bands = c->bands;
188  int off, ret, last_frame, skip;
189  int bits_used, bits_avail;
190 
191  memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
192 
193  buf_size = avpkt->size & ~3;
194  if (buf_size <= 0) {
195  av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
196  avpkt->size);
197  return AVERROR_INVALIDDATA;
198  }
199  if (buf_size != avpkt->size) {
200  av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
201  "extra bytes at the end will be skipped.\n");
202  }
203 
204  skip = buf[0];
205  last_frame = buf[1];
206  buf += 4;
207  buf_size -= 4;
208 
209  /* get output buffer */
210  frame->nb_samples = MPC_FRAME_SIZE;
211  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
212  return ret;
213 
214  av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
215  if (!c->bits)
216  return AVERROR(ENOMEM);
217  c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
218  buf_size >> 2);
219  if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0)
220  return ret;
221  skip_bits_long(&gb, skip);
222 
223  /* read subband indexes */
224  for(i = 0; i <= c->maxbands; i++){
225  for(ch = 0; ch < 2; ch++){
226  int t = i ? get_vlc2(&gb, hdr_vlc, MPC7_HDR_BITS, 1) : 4;
227  if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
228  else bands[i].res[ch] = bands[i-1].res[ch] + t;
229  if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
230  av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
231  return AVERROR_INVALIDDATA;
232  }
233  }
234 
235  if(bands[i].res[0] || bands[i].res[1]){
236  mb = i;
237  if(c->MSS) bands[i].msf = get_bits1(&gb);
238  }
239  }
240  /* get scale indexes coding method */
241  for(i = 0; i <= mb; i++)
242  for(ch = 0; ch < 2; ch++)
243  if (bands[i].res[ch])
244  bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc, MPC7_SCFI_BITS, 1);
245  /* get scale indexes */
246  for(i = 0; i <= mb; i++){
247  for(ch = 0; ch < 2; ch++){
248  if(bands[i].res[ch]){
249  bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
250  bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
251  switch(bands[i].scfi[ch]){
252  case 0:
253  bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
254  bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
255  break;
256  case 1:
257  bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
258  bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
259  break;
260  case 2:
261  bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
262  bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
263  break;
264  case 3:
265  bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
266  break;
267  }
268  c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
269  }
270  }
271  }
272  /* get quantizers */
273  memset(c->Q, 0, sizeof(c->Q));
274  off = 0;
275  for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
276  for(ch = 0; ch < 2; ch++)
277  idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
278 
279  ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
280  if(last_frame)
281  frame->nb_samples = c->lastframelen;
282 
283  bits_used = get_bits_count(&gb);
284  bits_avail = buf_size * 8;
285  if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
286  av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
287  return AVERROR_INVALIDDATA;
288  }
289  if(c->frames_to_skip){
290  c->frames_to_skip--;
291  *got_frame_ptr = 0;
292  return avpkt->size;
293  }
294 
295  *got_frame_ptr = 1;
296 
297  return avpkt->size;
298 }
299 
300 static av_cold void mpc7_decode_flush(AVCodecContext *avctx)
301 {
302  MPCContext *c = avctx->priv_data;
303 
304  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
305  c->frames_to_skip = 32;
306 }
307 
308 static av_cold int mpc7_decode_close(AVCodecContext *avctx)
309 {
310  MPCContext *c = avctx->priv_data;
311  av_freep(&c->bits);
312  c->buf_size = 0;
313  return 0;
314 }
315 
316 const FFCodec ff_mpc7_decoder = {
317  .p.name = "mpc7",
318  CODEC_LONG_NAME("Musepack SV7"),
319  .p.type = AVMEDIA_TYPE_AUDIO,
320  .p.id = AV_CODEC_ID_MUSEPACK7,
321  .priv_data_size = sizeof(MPCContext),
322  .init = mpc7_decode_init,
323  .close = mpc7_decode_close,
324  FF_CODEC_DECODE_CB(mpc7_decode_frame),
325  .flush = mpc7_decode_flush,
326  .p.capabilities = AV_CODEC_CAP_DR1,
327  CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16P),
328 };
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:276
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:216
mpc7_decode_frame
static int mpc7_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
Definition: mpc7.c:178
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:316
mem_internal.h
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:395
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:48
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:250
hdr_vlc
static VLCElem hdr_vlc[1<< MPC7_HDR_BITS]
Definition: mpc7.c:47
ff_mpadsp_init
av_cold void ff_mpadsp_init(MPADSPContext *s)
Definition: mpegaudiodsp.c:81
mpc7_decode_flush
static av_cold void mpc7_decode_flush(AVCodecContext *avctx)
Definition: mpc7.c:300
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:427
AVPacket::data
uint8_t * data
Definition: packet.h:558
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:308
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:329
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:512
mpc7_hdr
static const uint8_t mpc7_hdr[MPC7_HDR_SIZE *2]
Definition: mpc7data.h:48
close
static av_cold void close(AVCodecParserContext *s)
Definition: apv_parser.c:135
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:333
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:1039
GetBitContext
Definition: get_bits.h:109
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:210
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:539
VLCInitState
For static VLCs, the number of bits can often be hardcoded at each get_vlc2() callsite.
Definition: vlc.h:220
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:515
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:346
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:201
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:130
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:231
decode.h
get_bits.h
bands
static const float bands[]
Definition: af_superequalizer.c:56
state
static struct @522 state
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:331
mpc.h
dscf_vlc
static VLCElem dscf_vlc[1<< MPC7_DSCF_BITS]
Definition: mpc7.c:46
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:386
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:50
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:646
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:1720
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:368
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:559
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:319
codec_internal.h
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition: dsp.h:87
SAMPLES_PER_BAND
#define SAMPLES_PER_BAND
Definition: mpc.h:42
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1031
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
attributes.h
CODEC_SAMPLEFMTS
#define CODEC_SAMPLEFMTS(...)
Definition: codec_internal.h:385
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:170
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
mpc7_idx31
static const int8_t mpc7_idx31[]
Definition: mpc7data.h:28
mpc7data.h
AVCodecContext::extradata
uint8_t * extradata
Out-of-band global headers that may be used by some codecs.
Definition: avcodec.h:514
internal.h
BANDS
#define BANDS
Definition: imc.c:57
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:53
mpc7_decode_init
static av_cold int mpc7_decode_init(AVCodecContext *avctx)
Definition: mpc7.c:78
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:179
scfi_vlc
static VLCElem scfi_vlc[1<< MPC7_SCFI_BITS]
Definition: mpc7.c:45
avcodec.h
mpc7_idx30
static const int8_t mpc7_idx30[]
Definition: mpc7data.h:27
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:265
mpc7_dscf
static const uint8_t mpc7_dscf[MPC7_DSCF_SIZE *2]
Definition: mpc7data.h:41
AVCodecContext
main external API structure.
Definition: avcodec.h:431
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:442
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:117
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
mem.h
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:37
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:288
VLC_INIT_STATE
#define VLC_INIT_STATE(_table)
Definition: vlc.h:225
AVPacket
This structure stores compressed data.
Definition: packet.h:535
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:458
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
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:128
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:479
skip
static void BS_FUNC() skip(BSCTX *bc, unsigned int n)
Skip n bits in the buffer.
Definition: bitstream_template.h:383
mpc7_quant_vlc_off
static const int8_t mpc7_quant_vlc_off[MPC7_QUANT_VLC_TABLES]
Definition: mpc7data.h:58
Generated on Sun Sep 14 2025 19:21:42 for FFmpeg by   doxygen 1.8.17