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 "get_bits.h"
37 #include "internal.h"
38 #include "mpegaudiodsp.h"
39 
40 #include "mpc.h"
41 #include "mpc7data.h"
42 
43 static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
44 
45 static av_cold void mpc7_init_static(void)
46 {
47  static VLCElem quant_tables[7224];
48  const uint8_t *raw_quant_table = mpc7_quant_vlcs;
49 
50  INIT_VLC_STATIC_FROM_LENGTHS(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
51  &mpc7_scfi[1], 2,
52  &mpc7_scfi[0], 2, 1, 0, 0, 1 << MPC7_SCFI_BITS);
53  INIT_VLC_STATIC_FROM_LENGTHS(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
54  &mpc7_dscf[1], 2,
55  &mpc7_dscf[0], 2, 1, -7, 0, 1 << MPC7_DSCF_BITS);
56  INIT_VLC_STATIC_FROM_LENGTHS(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
57  &mpc7_hdr[1], 2,
58  &mpc7_hdr[0], 2, 1, -5, 0, 1 << MPC7_HDR_BITS);
59  for (unsigned i = 0, offset = 0; i < MPC7_QUANT_VLC_TABLES; i++){
60  for (int j = 0; j < 2; j++) {
61  quant_vlc[i][j].table = &quant_tables[offset];
62  quant_vlc[i][j].table_allocated = FF_ARRAY_ELEMS(quant_tables) - offset;
63  ff_init_vlc_from_lengths(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
64  &raw_quant_table[1], 2,
65  &raw_quant_table[0], 2, 1,
66  mpc7_quant_vlc_off[i],
67  INIT_VLC_STATIC_OVERLONG, NULL);
68  raw_quant_table += 2 * mpc7_quant_vlc_sizes[i];
69  offset += quant_vlc[i][j].table_size;
70  }
71  }
72  ff_mpa_synth_init_fixed();
73 }
74 
75 static av_cold int mpc7_decode_init(AVCodecContext * avctx)
76 {
77  static AVOnce init_static_once = AV_ONCE_INIT;
78  MPCContext *c = avctx->priv_data;
79  GetBitContext gb;
80  LOCAL_ALIGNED_16(uint8_t, buf, [16]);
81 
82  /* Musepack SV7 is always stereo */
83  if (avctx->ch_layout.nb_channels != 2) {
84  avpriv_request_sample(avctx, "%d channels", avctx->ch_layout.nb_channels);
85  return AVERROR_PATCHWELCOME;
86  }
87 
88  if(avctx->extradata_size < 16){
89  av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
90  return AVERROR_INVALIDDATA;
91  }
92  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
93  av_lfg_init(&c->rnd, 0xDEADBEEF);
94  ff_bswapdsp_init(&c->bdsp);
95  ff_mpadsp_init(&c->mpadsp);
96  c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
97  init_get_bits(&gb, buf, 128);
98 
99  c->IS = get_bits1(&gb);
100  c->MSS = get_bits1(&gb);
101  c->maxbands = get_bits(&gb, 6);
102  if(c->maxbands >= BANDS){
103  av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
104  return AVERROR_INVALIDDATA;
105  }
106  skip_bits_long(&gb, 88);
107  c->gapless = get_bits1(&gb);
108  c->lastframelen = get_bits(&gb, 11);
109  av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
110  c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
111  c->frames_to_skip = 0;
112 
113  avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
114  av_channel_layout_uninit(&avctx->ch_layout);
115  avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
116 
117  ff_thread_once(&init_static_once, mpc7_init_static);
118 
119  return 0;
120 }
121 
122 /**
123  * Fill samples for given subband
124  */
125 static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
126 {
127  int i, i1, t;
128  switch(idx){
129  case -1:
130  for(i = 0; i < SAMPLES_PER_BAND; i++){
131  *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
132  }
133  break;
134  case 1:
135  i1 = get_bits1(gb);
136  for(i = 0; i < SAMPLES_PER_BAND/3; i++){
137  t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
138  *dst++ = mpc7_idx30[t];
139  *dst++ = mpc7_idx31[t];
140  *dst++ = mpc7_idx32[t];
141  }
142  break;
143  case 2:
144  i1 = get_bits1(gb);
145  for(i = 0; i < SAMPLES_PER_BAND/2; i++){
146  t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
147  *dst++ = mpc7_idx50[t];
148  *dst++ = mpc7_idx51[t];
149  }
150  break;
151  case 3: case 4: case 5: case 6: case 7:
152  i1 = get_bits1(gb);
153  for(i = 0; i < SAMPLES_PER_BAND; i++)
154  *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2);
155  break;
156  case 8: case 9: case 10: case 11: case 12:
157  case 13: case 14: case 15: case 16: case 17:
158  t = (1 << (idx - 2)) - 1;
159  for(i = 0; i < SAMPLES_PER_BAND; i++)
160  *dst++ = get_bits(gb, idx - 1) - t;
161  break;
162  default: // case 0 and -2..-17
163  return;
164  }
165 }
166 
167 static int get_scale_idx(GetBitContext *gb, int ref)
168 {
169  int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1);
170  if (t == 8)
171  return get_bits(gb, 6);
172  return ref + t;
173 }
174 
175 static int mpc7_decode_frame(AVCodecContext *avctx, AVFrame *frame,
176  int *got_frame_ptr, AVPacket *avpkt)
177 {
178  const uint8_t *buf = avpkt->data;
179  int buf_size;
180  MPCContext *c = avctx->priv_data;
181  GetBitContext gb;
182  int i, ch;
183  int mb = -1;
184  Band *bands = c->bands;
185  int off, ret, last_frame, skip;
186  int bits_used, bits_avail;
187 
188  memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
189 
190  buf_size = avpkt->size & ~3;
191  if (buf_size <= 0) {
192  av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
193  avpkt->size);
194  return AVERROR_INVALIDDATA;
195  }
196  if (buf_size != avpkt->size) {
197  av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
198  "extra bytes at the end will be skipped.\n");
199  }
200 
201  skip = buf[0];
202  last_frame = buf[1];
203  buf += 4;
204  buf_size -= 4;
205 
206  /* get output buffer */
207  frame->nb_samples = MPC_FRAME_SIZE;
208  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
209  return ret;
210 
211  av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
212  if (!c->bits)
213  return AVERROR(ENOMEM);
214  c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
215  buf_size >> 2);
216  if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0)
217  return ret;
218  skip_bits_long(&gb, skip);
219 
220  /* read subband indexes */
221  for(i = 0; i <= c->maxbands; i++){
222  for(ch = 0; ch < 2; ch++){
223  int t = i ? get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) : 4;
224  if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
225  else bands[i].res[ch] = bands[i-1].res[ch] + t;
226  if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
227  av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
228  return AVERROR_INVALIDDATA;
229  }
230  }
231 
232  if(bands[i].res[0] || bands[i].res[1]){
233  mb = i;
234  if(c->MSS) bands[i].msf = get_bits1(&gb);
235  }
236  }
237  /* get scale indexes coding method */
238  for(i = 0; i <= mb; i++)
239  for(ch = 0; ch < 2; ch++)
240  if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
241  /* get scale indexes */
242  for(i = 0; i <= mb; i++){
243  for(ch = 0; ch < 2; ch++){
244  if(bands[i].res[ch]){
245  bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
246  bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
247  switch(bands[i].scfi[ch]){
248  case 0:
249  bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
250  bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
251  break;
252  case 1:
253  bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
254  bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
255  break;
256  case 2:
257  bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
258  bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
259  break;
260  case 3:
261  bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
262  break;
263  }
264  c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
265  }
266  }
267  }
268  /* get quantizers */
269  memset(c->Q, 0, sizeof(c->Q));
270  off = 0;
271  for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
272  for(ch = 0; ch < 2; ch++)
273  idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
274 
275  ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
276  if(last_frame)
277  frame->nb_samples = c->lastframelen;
278 
279  bits_used = get_bits_count(&gb);
280  bits_avail = buf_size * 8;
281  if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
282  av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
283  return AVERROR_INVALIDDATA;
284  }
285  if(c->frames_to_skip){
286  c->frames_to_skip--;
287  *got_frame_ptr = 0;
288  return avpkt->size;
289  }
290 
291  *got_frame_ptr = 1;
292 
293  return avpkt->size;
294 }
295 
296 static void mpc7_decode_flush(AVCodecContext *avctx)
297 {
298  MPCContext *c = avctx->priv_data;
299 
300  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
301  c->frames_to_skip = 32;
302 }
303 
304 static av_cold int mpc7_decode_close(AVCodecContext *avctx)
305 {
306  MPCContext *c = avctx->priv_data;
307  av_freep(&c->bits);
308  c->buf_size = 0;
309  return 0;
310 }
311 
312 const FFCodec ff_mpc7_decoder = {
313  .p.name = "mpc7",
314  .p.long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"),
315  .p.type = AVMEDIA_TYPE_AUDIO,
316  .p.id = AV_CODEC_ID_MUSEPACK7,
317  .priv_data_size = sizeof(MPCContext),
318  .init = mpc7_decode_init,
319  .close = mpc7_decode_close,
320  FF_CODEC_DECODE_CB(mpc7_decode_frame),
321  .flush = mpc7_decode_flush,
322  .p.capabilities = AV_CODEC_CAP_DR1,
323  .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
324  AV_SAMPLE_FMT_NONE },
325  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
326 };
MPC7_SCFI_BITS
#define MPC7_SCFI_BITS
Definition: mpc7data.h:34
dscf_vlc
static VLC dscf_vlc
Definition: mpc7.c:43
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:291
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:175
scfi_vlc
static VLC scfi_vlc
Definition: mpc7.c:43
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:312
hdr_vlc
static VLC hdr_vlc
Definition: mpc7.c:43
mem_internal.h
av_lfg_init
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:32
thread.h
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
ff_mpadsp_init
av_cold void ff_mpadsp_init(MPADSPContext *s)
Definition: mpegaudiodsp.c:82
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:374
quant_vlc
static VLC quant_vlc[MPC7_QUANT_VLC_TABLES][2]
Definition: mpc7.c:43
table
static const uint16_t table[]
Definition: prosumer.c:206
MPCContext
Definition: mpc.h:54
FFCodec
Definition: codec_internal.h:112
mpc7_decode_close
static av_cold int mpc7_decode_close(AVCodecContext *avctx)
Definition: mpc7.c:304
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:354
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:300
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:649
init
static int init
Definition: av_tx.c:47
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:379
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:116
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:2056
GetBitContext
Definition: get_bits.h:61
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:179
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
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:667
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:491
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:254
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:130
mpc7_decode_flush
static void mpc7_decode_flush(AVCodecContext *avctx)
Definition: mpc7.c:296
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
get_bits.h
bands
static const float bands[]
Definition: af_superequalizer.c:56
mpc.h
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:177
ff_bswapdsp_init
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
NULL
#define NULL
Definition: coverity.c:32
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
INIT_VLC_STATIC_FROM_LENGTHS
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Definition: vlc.h:131
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
ff_init_vlc_from_lengths
int ff_init_vlc_from_lengths(VLC *vlc, int nb_bits, int nb_codes, const int8_t *lens, int lens_wrap, const void *symbols, int symbols_wrap, int symbols_size, int offset, int flags, void *logctx)
Build VLC decoding tables suitable for use with get_vlc2()
Definition: vlc.c:328
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:45
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:787
AVOnce
#define AVOnce
Definition: thread.h:176
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
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:630
MPC7_QUANT_VLC_TABLES
#define MPC7_QUANT_VLC_TABLES
Definition: mpc7data.h:53
VLC::table_allocated
int table_allocated
Definition: vlc.h:34
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1403
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:375
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
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:290
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:1014
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
VLCElem
Definition: vlc.h:27
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
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
mb
#define mb
Definition: vf_colormatrix.c:101
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:167
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
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:490
internal.h
BANDS
#define BANDS
Definition: imc.c:57
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:48
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: codec_internal.h:31
mpc7_decode_init
static av_cold int mpc7_decode_init(AVCodecContext *avctx)
Definition: mpc7.c:75
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:203
avcodec.h
mpc7_idx30
static const int8_t mpc7_idx30[]
Definition: mpc7data.h:27
ret
ret
Definition: filter_design.txt:187
INIT_VLC_STATIC_OVERLONG
#define INIT_VLC_STATIC_OVERLONG
Definition: vlc.h:101
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
mpc7_dscf
static const uint8_t mpc7_dscf[MPC7_DSCF_SIZE *2]
Definition: mpc7data.h:41
AVCodecContext
main external API structure.
Definition: avcodec.h:389
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
VLC
Definition: vlc.h:31
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
VLC::table
VLCElem * table
Definition: vlc.h:33
VLC::table_size
int table_size
Definition: vlc.h:34
mpegaudiodsp.h
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:416
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:125
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:455
mpc7_quant_vlc_off
static const int8_t mpc7_quant_vlc_off[MPC7_QUANT_VLC_TABLES]
Definition: mpc7data.h:58
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