mpc7.c
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1 /*
2  * Musepack SV7 decoder
3  * Copyright (c) 2006 Konstantin Shishkov
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
29 #include "libavutil/lfg.h"
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "dsputil.h"
33 #include "internal.h"
34 #include "mpegaudiodsp.h"
35 
36 #include "mpc.h"
37 #include "mpc7data.h"
38 
39 #define BANDS 32
40 #define SAMPLES_PER_BAND 36
41 #define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND)
42 
44 
45 static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] =
46 {
47  0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124,
48  5636, 6164, 6676, 7224
49 };
50 
51 
53 {
54  int i, j;
55  MPCContext *c = avctx->priv_data;
56  GetBitContext gb;
57  LOCAL_ALIGNED_16(uint8_t, buf, [16]);
58  static int vlc_initialized = 0;
59 
60  static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2];
61  static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2];
62  static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2];
63  static VLC_TYPE quant_tables[7224][2];
64 
65  /* Musepack SV7 is always stereo */
66  if (avctx->channels != 2) {
67  av_log_ask_for_sample(avctx, "Unsupported number of channels: %d\n",
68  avctx->channels);
69  return AVERROR_PATCHWELCOME;
70  }
71 
72  if(avctx->extradata_size < 16){
73  av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
74  return -1;
75  }
76  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
77  av_lfg_init(&c->rnd, 0xDEADBEEF);
78  ff_dsputil_init(&c->dsp, avctx);
80  c->dsp.bswap_buf((uint32_t*)buf, (const uint32_t*)avctx->extradata, 4);
81  ff_mpc_init();
82  init_get_bits(&gb, buf, 128);
83 
84  c->IS = get_bits1(&gb);
85  c->MSS = get_bits1(&gb);
86  c->maxbands = get_bits(&gb, 6);
87  if(c->maxbands >= BANDS){
88  av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands);
89  return -1;
90  }
91  skip_bits_long(&gb, 88);
92  c->gapless = get_bits1(&gb);
93  c->lastframelen = get_bits(&gb, 11);
94  av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n",
95  c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands);
96  c->frames_to_skip = 0;
97 
100 
101  if(vlc_initialized) return 0;
102  av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
103  scfi_vlc.table = scfi_table;
104  scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS;
105  if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
106  &mpc7_scfi[1], 2, 1,
107  &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
108  av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n");
109  return -1;
110  }
111  dscf_vlc.table = dscf_table;
112  dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS;
113  if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
114  &mpc7_dscf[1], 2, 1,
115  &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
116  av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n");
117  return -1;
118  }
119  hdr_vlc.table = hdr_table;
120  hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS;
121  if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
122  &mpc7_hdr[1], 2, 1,
123  &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){
124  av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n");
125  return -1;
126  }
127  for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){
128  for(j = 0; j < 2; j++){
129  quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]];
130  quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j];
131  if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
132  &mpc7_quant_vlc[i][j][1], 4, 2,
133  &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC)){
134  av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j);
135  return -1;
136  }
137  }
138  }
139  vlc_initialized = 1;
140 
142  avctx->coded_frame = &c->frame;
143 
144  return 0;
145 }
146 
150 static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
151 {
152  int i, i1, t;
153  switch(idx){
154  case -1:
155  for(i = 0; i < SAMPLES_PER_BAND; i++){
156  *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
157  }
158  break;
159  case 1:
160  i1 = get_bits1(gb);
161  for(i = 0; i < SAMPLES_PER_BAND/3; i++){
162  t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
163  *dst++ = mpc7_idx30[t];
164  *dst++ = mpc7_idx31[t];
165  *dst++ = mpc7_idx32[t];
166  }
167  break;
168  case 2:
169  i1 = get_bits1(gb);
170  for(i = 0; i < SAMPLES_PER_BAND/2; i++){
171  t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
172  *dst++ = mpc7_idx50[t];
173  *dst++ = mpc7_idx51[t];
174  }
175  break;
176  case 3: case 4: case 5: case 6: case 7:
177  i1 = get_bits1(gb);
178  for(i = 0; i < SAMPLES_PER_BAND; i++)
179  *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2) - mpc7_quant_vlc_off[idx-1];
180  break;
181  case 8: case 9: case 10: case 11: case 12:
182  case 13: case 14: case 15: case 16: case 17:
183  t = (1 << (idx - 2)) - 1;
184  for(i = 0; i < SAMPLES_PER_BAND; i++)
185  *dst++ = get_bits(gb, idx - 1) - t;
186  break;
187  default: // case 0 and -2..-17
188  return;
189  }
190 }
191 
192 static int get_scale_idx(GetBitContext *gb, int ref)
193 {
194  int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7;
195  if (t == 8)
196  return get_bits(gb, 6);
197  return av_clip_uintp2(ref + t, 7);
198 }
199 
200 static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
201  int *got_frame_ptr, AVPacket *avpkt)
202 {
203  const uint8_t *buf = avpkt->data;
204  int buf_size;
205  MPCContext *c = avctx->priv_data;
206  GetBitContext gb;
207  int i, ch;
208  int mb = -1;
209  Band *bands = c->bands;
210  int off, ret, last_frame, skip;
211  int bits_used, bits_avail;
212 
213  memset(bands, 0, sizeof(*bands) * (c->maxbands + 1));
214 
215  buf_size = avpkt->size & ~3;
216  if (buf_size <= 0) {
217  av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n",
218  avpkt->size);
219  return AVERROR_INVALIDDATA;
220  }
221  if (buf_size != avpkt->size) {
222  av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. "
223  "extra bytes at the end will be skipped.\n");
224  }
225 
226  skip = buf[0];
227  last_frame = buf[1];
228  buf += 4;
229  buf_size -= 4;
230 
231  /* get output buffer */
232  c->frame.nb_samples = last_frame ? c->lastframelen : MPC_FRAME_SIZE;
233  if ((ret = ff_get_buffer(avctx, &c->frame)) < 0) {
234  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
235  return ret;
236  }
237 
238  av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
239  if (!c->bits)
240  return AVERROR(ENOMEM);
241  c->dsp.bswap_buf((uint32_t *)c->bits, (const uint32_t *)buf, buf_size >> 2);
242  init_get_bits(&gb, c->bits, buf_size * 8);
243  skip_bits_long(&gb, skip);
244 
245  /* read subband indexes */
246  for(i = 0; i <= c->maxbands; i++){
247  for(ch = 0; ch < 2; ch++){
248  int t = 4;
249  if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5;
250  if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
251  else bands[i].res[ch] = av_clip(bands[i-1].res[ch] + t, 0, 17);
252  }
253 
254  if(bands[i].res[0] || bands[i].res[1]){
255  mb = i;
256  if(c->MSS) bands[i].msf = get_bits1(&gb);
257  }
258  }
259  /* get scale indexes coding method */
260  for(i = 0; i <= mb; i++)
261  for(ch = 0; ch < 2; ch++)
262  if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
263  /* get scale indexes */
264  for(i = 0; i <= mb; i++){
265  for(ch = 0; ch < 2; ch++){
266  if(bands[i].res[ch]){
267  bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i];
268  bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]);
269  switch(bands[i].scfi[ch]){
270  case 0:
271  bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
272  bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
273  break;
274  case 1:
275  bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]);
276  bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1];
277  break;
278  case 2:
279  bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
280  bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]);
281  break;
282  case 3:
283  bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0];
284  break;
285  }
286  c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2];
287  }
288  }
289  }
290  /* get quantizers */
291  memset(c->Q, 0, sizeof(c->Q));
292  off = 0;
293  for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND)
294  for(ch = 0; ch < 2; ch++)
295  idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off);
296 
297  ff_mpc_dequantize_and_synth(c, mb, (int16_t **)c->frame.extended_data, 2);
298 
299  bits_used = get_bits_count(&gb);
300  bits_avail = buf_size * 8;
301  if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
302  av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail);
303  return -1;
304  }
305  if(c->frames_to_skip){
306  c->frames_to_skip--;
307  *got_frame_ptr = 0;
308  return avpkt->size;
309  }
310 
311  *got_frame_ptr = 1;
312  *(AVFrame *)data = c->frame;
313 
314  return avpkt->size;
315 }
316 
318 {
319  MPCContext *c = avctx->priv_data;
320 
321  memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
322  c->frames_to_skip = 32;
323 }
324 
326 {
327  MPCContext *c = avctx->priv_data;
328  av_freep(&c->bits);
329  c->buf_size = 0;
330  return 0;
331 }
332 
334  .name = "mpc7",
335  .type = AVMEDIA_TYPE_AUDIO,
336  .id = AV_CODEC_ID_MUSEPACK7,
337  .priv_data_size = sizeof(MPCContext),
342  .capabilities = CODEC_CAP_DR1,
343  .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"),
344  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
346 };
void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, int16_t **out, int channels)
Definition: mpc.c:62
av_cold void ff_dsputil_init(DSPContext *c, AVCodecContext *avctx)
Definition: dsputil.c:2656
This structure describes decoded (raw) audio or video data.
Definition: avcodec.h:989
static const int8_t mpc7_idx32[]
Definition: mpc7data.h:29
MPADSPContext mpadsp
Definition: mpc.h:55
static const uint16_t mpc7_quant_vlc[MPC7_QUANT_VLC_TABLES][2][64 *2]
Definition: mpc7data.h:62
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:237
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:197
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2725
int msf
mid-stereo flag
Definition: mpc.h:45
int Q[2][MPC_FRAME_SIZE]
Definition: mpc.h:63
int size
Definition: avcodec.h:916
int res[2]
Definition: mpc.h:46
AVLFG rnd
Definition: mpc.h:67
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer with padding, reusing the given one if large enough.
Definition: utils.c:85
#define VLC_TYPE
Definition: get_bits.h:61
#define AV_CH_LAYOUT_STEREO
static VLC dscf_vlc
Definition: mpc7.c:43
AVCodec.
Definition: avcodec.h:2960
static const uint8_t mpc7_quant_vlc_sizes[MPC7_QUANT_VLC_TABLES *2]
Definition: mpc7data.h:54
int buf_size
Definition: mpc.h:66
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:151
int lastframelen
Definition: mpc.h:58
static int mpc7_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: mpc7.c:200
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:228
int gapless
Definition: mpc.h:57
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2112
uint8_t
#define SAMPLES_PER_BAND
Definition: mpc7.c:40
#define MPC7_DSCF_BITS
Definition: mpc7data.h:40
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1454
const char data[16]
Definition: mxf.c:66
int scf_idx[2][3]
Definition: mpc.h:48
uint8_t * data
Definition: avcodec.h:915
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:192
bitstream reader API header.
#define LOCAL_ALIGNED_16(t, v,...)
Definition: dsputil.h:602
AVFrame frame
Definition: mpc.h:53
static const int8_t mpc7_idx50[]
Definition: mpc7data.h:30
static float t
static int init(AVCodecParserContext *s)
Definition: h264_parser.c:335
static const int8_t mpc7_idx31[]
Definition: mpc7data.h:28
#define MPC7_HDR_SIZE
Definition: mpc7data.h:46
int IS
Definition: mpc.h:57
void av_log_ask_for_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message asking for a sample.
static const uint8_t mpc7_hdr[MPC7_HDR_SIZE *2]
Definition: mpc7data.h:48
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: dsputil.h:343
#define MPC7_QUANT_VLC_TABLES
Definition: mpc7data.h:53
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
static const uint8_t mpc7_quant_vlc_off[MPC7_QUANT_VLC_TABLES]
Definition: mpc7data.h:58
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
const char * name
Name of the codec implementation.
Definition: avcodec.h:2967
static const uint8_t mpc7_scfi[MPC7_SCFI_SIZE *2]
Definition: mpc7data.h:35
int maxbands
Definition: mpc.h:59
Definition: get_bits.h:63
int off
Definition: dsputil_bfin.c:28
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2165
void ff_mpadsp_init(MPADSPContext *s)
Definition: mpegaudiodsp.c:26
static av_cold int mpc7_decode_init(AVCodecContext *avctx)
Definition: mpc7.c:52
audio channel layout utility functions
uint8_t * bits
Definition: mpc.h:65
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame)
Get a buffer for a frame.
Definition: utils.c:464
static void mpc7_decode_flush(AVCodecContext *avctx)
Definition: mpc7.c:317
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:515
#define MPC7_SCFI_BITS
Definition: mpc7data.h:34
#define INIT_VLC_USE_NEW_STATIC
Definition: get_bits.h:433
int table_allocated
Definition: get_bits.h:66
external API header
Musepack decoder MPEG Audio Layer 1/2 -like codec with frames of 1152 samples divided into 32 subband...
static const int8_t mpc7_idx51[]
Definition: mpc7data.h:31
AV_SAMPLE_FMT_NONE
Definition: avconv_filter.c:63
int scfi[2]
Definition: mpc.h:47
main external API structure.
Definition: avcodec.h:1339
DSPContext dsp
Definition: mpc.h:54
static VLC hdr_vlc
Definition: mpc7.c:43
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:326
AVCodec ff_mpc7_decoder
Definition: mpc7.c:333
static void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst)
Fill samples for given subband.
Definition: mpc7.c:150
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: get_bits.h:418
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:38
int extradata_size
Definition: avcodec.h:1455
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:268
void avcodec_get_frame_defaults(AVFrame *frame)
Set the fields of the given AVFrame to default values.
Definition: utils.c:602
int oldDSCF[2][BANDS]
Definition: mpc.h:61
#define MPC7_HDR_BITS
Definition: mpc7data.h:47
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:372
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:30
static av_cold int mpc7_decode_close(AVCodecContext *avctx)
Definition: mpc7.c:325
#define MPC7_SCFI_SIZE
Definition: mpc7data.h:33
Band bands[BANDS]
Definition: mpc.h:62
common internal api header.
static av_cold void flush(AVCodecContext *avctx)
Flush (reset) the frame ID after seeking.
Definition: alsdec.c:1772
AVSampleFormat
Audio Sample Formats.
Definition: samplefmt.h:49
static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES *2+1]
Definition: mpc7.c:45
#define MPC_FRAME_SIZE
Definition: mpc7.c:41
int MSS
Definition: mpc.h:57
DSP utils.
void * priv_data
Definition: avcodec.h:1382
void ff_mpc_init(void)
Definition: mpc.c:38
static const int8_t mpc7_idx30[]
Definition: mpc7data.h:27
static VLC scfi_vlc
Definition: mpc7.c:43
int channels
number of audio channels
Definition: avcodec.h:2105
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
signed 16 bits, planar
Definition: samplefmt.h:58
#define BANDS
Definition: mpc7.c:39
struct MPCContext MPCContext
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: avcodec.h:1028
static const uint8_t mpc7_dscf[MPC7_DSCF_SIZE *2]
Definition: mpc7data.h:41
static int get_scale_idx(GetBitContext *gb, int ref)
Definition: mpc7.c:192
Subband structure - hold all variables for each subband.
Definition: mpc.h:44
This structure stores compressed data.
Definition: avcodec.h:898
#define MPC7_DSCF_SIZE
Definition: mpc7data.h:39
int nb_samples
number of audio samples (per channel) described by this frame
Definition: avcodec.h:1042
static VLC quant_vlc[MPC7_QUANT_VLC_TABLES][2]
Definition: mpc7.c:43
Definition: mpc.h:52
int frames_to_skip
Definition: mpc.h:68