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 
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 "get_bits.h"
36 #include "internal.h"
37 #include "mpegaudiodsp.h"
38 
39 #include "mpc.h"
40 #include "mpc7data.h"
41 
43 
44 static av_cold void mpc7_init_static(void)
45 {
46  static VLC_TYPE quant_tables[7224][2];
47  const uint8_t *raw_quant_table = mpc7_quant_vlcs;
48 
50  &mpc7_scfi[1], 2,
51  &mpc7_scfi[0], 2, 1, 0, 0, 1 << MPC7_SCFI_BITS);
53  &mpc7_dscf[1], 2,
54  &mpc7_dscf[0], 2, 1, -7, 0, 1 << MPC7_DSCF_BITS);
56  &mpc7_hdr[1], 2,
57  &mpc7_hdr[0], 2, 1, -5, 0, 1 << MPC7_HDR_BITS);
58  for (unsigned i = 0, offset = 0; i < MPC7_QUANT_VLC_TABLES; i++){
59  for (int j = 0; j < 2; j++) {
60  quant_vlc[i][j].table = &quant_tables[offset];
61  quant_vlc[i][j].table_allocated = FF_ARRAY_ELEMS(quant_tables) - offset;
63  &raw_quant_table[1], 2,
64  &raw_quant_table[0], 2, 1,
67  raw_quant_table += 2 * mpc7_quant_vlc_sizes[i];
69  }
70  }
72 }
73 
75 {
76  static AVOnce init_static_once = AV_ONCE_INIT;
77  MPCContext *c = avctx->priv_data;
78  GetBitContext gb;
79  LOCAL_ALIGNED_16(uint8_t, buf, [16]);
80 
81  /* Musepack SV7 is always stereo */
82  if (avctx->channels != 2) {
83  avpriv_request_sample(avctx, "%d channels", avctx->channels);
84  return AVERROR_PATCHWELCOME;
85  }
86 
87  if(avctx->extradata_size < 16){
88  av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
89  return AVERROR_INVALIDDATA;
90  }
91  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
92  av_lfg_init(&c->rnd, 0xDEADBEEF);
93  ff_bswapdsp_init(&c->bdsp);
94  ff_mpadsp_init(&c->mpadsp);
95  c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4);
96  init_get_bits(&gb, buf, 128);
97 
98  c->IS = get_bits1(&gb);
99  c->MSS = get_bits1(&gb);
100  c->maxbands = get_bits(&gb, 6);
101  if(c->maxbands >= BANDS){
102  av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
103  return AVERROR_INVALIDDATA;
104  }
105  skip_bits_long(&gb, 88);
106  c->gapless = get_bits1(&gb);
107  c->lastframelen = get_bits(&gb, 11);
108  av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
109  c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
110  c->frames_to_skip = 0;
111 
114 
115  ff_thread_once(&init_static_once, mpc7_init_static);
116 
117  return 0;
118 }
119 
120 /**
121  * Fill samples for given subband
122  */
123 static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
124 {
125  int i, i1, t;
126  switch(idx){
127  case -1:
128  for(i = 0; i < SAMPLES_PER_BAND; i++){
129  *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
130  }
131  break;
132  case 1:
133  i1 = get_bits1(gb);
134  for(i = 0; i < SAMPLES_PER_BAND/3; i++){
135  t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
136  *dst++ = mpc7_idx30[t];
137  *dst++ = mpc7_idx31[t];
138  *dst++ = mpc7_idx32[t];
139  }
140  break;
141  case 2:
142  i1 = get_bits1(gb);
143  for(i = 0; i < SAMPLES_PER_BAND/2; i++){
144  t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
145  *dst++ = mpc7_idx50[t];
146  *dst++ = mpc7_idx51[t];
147  }
148  break;
149  case 3: case 4: case 5: case 6: case 7:
150  i1 = get_bits1(gb);
151  for(i = 0; i < SAMPLES_PER_BAND; i++)
152  *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2);
153  break;
154  case 8: case 9: case 10: case 11: case 12:
155  case 13: case 14: case 15: case 16: case 17:
156  t = (1 << (idx - 2)) - 1;
157  for(i = 0; i < SAMPLES_PER_BAND; i++)
158  *dst++ = get_bits(gb, idx - 1) - t;
159  break;
160  default: // case 0 and -2..-17
161  return;
162  }
163 }
164 
165 static int get_scale_idx(GetBitContext *gb, int ref)
166 {
167  int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1);
168  if (t == 8)
169  return get_bits(gb, 6);
170  return ref + t;
171 }
172 
173 static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
174  int *got_frame_ptr, AVPacket *avpkt)
175 {
176  AVFrame *frame = data;
177  const uint8_t *buf = avpkt->data;
178  int buf_size;
179  MPCContext *c = avctx->priv_data;
180  GetBitContext gb;
181  int i, ch;
182  int mb = -1;
183  Band *bands = c->bands;
184  int off, ret, last_frame, skip;
185  int bits_used, bits_avail;
186 
187  memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
188 
189  buf_size = avpkt->size & ~3;
190  if (buf_size <= 0) {
191  av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
192  avpkt->size);
193  return AVERROR_INVALIDDATA;
194  }
195  if (buf_size != avpkt->size) {
196  av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
197  "extra bytes at the end will be skipped.\n");
198  }
199 
200  skip = buf[0];
201  last_frame = buf[1];
202  buf += 4;
203  buf_size -= 4;
204 
205  /* get output buffer */
206  frame->nb_samples = MPC_FRAME_SIZE;
207  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
208  return ret;
209 
210  av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
211  if (!c->bits)
212  return AVERROR(ENOMEM);
213  c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf,
214  buf_size >> 2);
215  if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0)
216  return ret;
217  skip_bits_long(&gb, skip);
218 
219  /* read subband indexes */
220  for(i = 0; i <= c->maxbands; i++){
221  for(ch = 0; ch < 2; ch++){
222  int t = i ? get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) : 4;
223  if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
224  else bands[i].res[ch] = bands[i-1].res[ch] + t;
225  if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
226  av_log(avctx, AV_LOG_ERROR, "subband index invalid\n");
227  return AVERROR_INVALIDDATA;
228  }
229  }
230 
231  if(bands[i].res[0] || bands[i].res[1]){
232  mb = i;
233  if(c->MSS) bands[i].msf = get_bits1(&gb);
234  }
235  }
236  /* get scale indexes coding method */
237  for(i = 0; i <= mb; i++)
238  for(ch = 0; ch < 2; ch++)
239  if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
240  /* get scale indexes */
241  for(i = 0; i <= mb; i++){
242  for(ch = 0; ch < 2; ch++){
243  if(bands[i].res[ch]){
244  bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
245  bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
246  switch(bands[i].scfi[ch]){
247  case 0:
248  bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
249  bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
250  break;
251  case 1:
252  bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
253  bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
254  break;
255  case 2:
256  bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
257  bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
258  break;
259  case 3:
260  bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
261  break;
262  }
263  c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
264  }
265  }
266  }
267  /* get quantizers */
268  memset(c->Q, 0, sizeof(c->Q));
269  off = 0;
270  for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
271  for(ch = 0; ch < 2; ch++)
272  idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
273 
274  ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2);
275  if(last_frame)
276  frame->nb_samples = c->lastframelen;
277 
278  bits_used = get_bits_count(&gb);
279  bits_avail = buf_size * 8;
280  if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
281  av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
282  return AVERROR_INVALIDDATA;
283  }
284  if(c->frames_to_skip){
285  c->frames_to_skip--;
286  *got_frame_ptr = 0;
287  return avpkt->size;
288  }
289 
290  *got_frame_ptr = 1;
291 
292  return avpkt->size;
293 }
294 
296 {
297  MPCContext *c = avctx->priv_data;
298 
299  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
300  c->frames_to_skip = 32;
301 }
302 
304 {
305  MPCContext *c = avctx->priv_data;
306  av_freep(&c->bits);
307  c->buf_size = 0;
308  return 0;
309 }
310 
312  .name = "mpc7",
313  .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"),
314  .type = AVMEDIA_TYPE_AUDIO,
315  .id = AV_CODEC_ID_MUSEPACK7,
316  .priv_data_size = sizeof(MPCContext),
318  .close = mpc7_decode_close,
321  .capabilities = AV_CODEC_CAP_DR1,
322  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
324  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
325 };
MPC7_SCFI_BITS
#define MPC7_SCFI_BITS
Definition: mpc7data.h:34
dscf_vlc
static VLC dscf_vlc
Definition: mpc7.c:42
mpc7_scfi
static const uint8_t mpc7_scfi[MPC7_SCFI_SIZE *2]
Definition: mpc7data.h:35
AVCodec
AVCodec.
Definition: codec.h:197
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:187
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: internal.h:41
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
scfi_vlc
static VLC scfi_vlc
Definition: mpc7.c:42
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
AVCodecContext::channel_layout
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1149
hdr_vlc
static VLC hdr_vlc
Definition: mpc7.c:42
mem_internal.h
av_lfg_init
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:32
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:953
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:81
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
quant_vlc
static VLC quant_vlc[MPC7_QUANT_VLC_TABLES][2]
Definition: mpc7.c:42
table
static const uint16_t table[]
Definition: prosumer.c:206
data
const char data[16]
Definition: mxf.c:142
MPCContext
Definition: mpc.h:53
mpc7_decode_close
static av_cold int mpc7_decode_close(AVCodecContext *avctx)
Definition: mpc7.c:303
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:797
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:659
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
VLC_TYPE
#define VLC_TYPE
Definition: vlc.h:24
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:56
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:91
ff_init_vlc_from_lengths
int ff_init_vlc_from_lengths(VLC *vlc_arg, 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: bitstream.c:370
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:175
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
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:677
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:603
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
ff_mpc7_decoder
const AVCodec ff_mpc7_decoder
Definition: mpc7.c:311
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:295
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:202
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:173
ff_bswapdsp_init
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
flush
static void flush(AVCodecContext *avctx)
Definition: aacdec_template.c:592
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
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:42
INIT_VLC_STATIC_FROM_LENGTHS
#define INIT_VLC_STATIC_FROM_LENGTHS(vlc, bits, nb_codes, lens, len_wrap, symbols, symbols_wrap, symbols_size, offset, flags, static_size)
Definition: vlc.h:126
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
mpc7_decode_frame
static int mpc7_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: mpc7.c:173
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:44
AVOnce
#define AVOnce
Definition: thread.h:172
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
VLC::table_allocated
int table_allocated
Definition: vlc.h:29
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1638
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:366
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
SAMPLES_PER_BAND
#define SAMPLES_PER_BAND
Definition: mpc.h:41
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1106
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
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:67
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:1099
get_scale_idx
static int get_scale_idx(GetBitContext *gb, int ref)
Definition: mpc7.c:165
i
int i
Definition: input.c:407
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:602
internal.h
BANDS
#define BANDS
Definition: imc.c:55
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
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:50
mpc7_decode_init
static av_cold int mpc7_decode_init(AVCodecContext *avctx)
Definition: mpc7.c:74
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
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:96
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:501
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:45
VLC
Definition: vlc.h:26
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:107
VLC::table_size
int table_size
Definition: vlc.h:29
mpegaudiodsp.h
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:528
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
idx_to_quant
static void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
Fill samples for given subband.
Definition: mpc7.c:123
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AV_CODEC_ID_MUSEPACK7
@ AV_CODEC_ID_MUSEPACK7
Definition: codec_id.h:448
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
mpc7_quant_vlc_off
static const int8_t mpc7_quant_vlc_off[MPC7_QUANT_VLC_TABLES]
Definition: mpc7data.h:58