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shorten.c
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1 /*
2  * Shorten decoder
3  * Copyright (c) 2005 Jeff Muizelaar
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  * Shorten decoder
25  * @author Jeff Muizelaar
26  */
27 
28 #include <limits.h>
29 #include "avcodec.h"
30 #include "bswapdsp.h"
31 #include "bytestream.h"
32 #include "get_bits.h"
33 #include "golomb.h"
34 #include "internal.h"
35 
36 #define MAX_CHANNELS 8
37 #define MAX_BLOCKSIZE 65535
38 
39 #define OUT_BUFFER_SIZE 16384
40 
41 #define ULONGSIZE 2
42 
43 #define WAVE_FORMAT_PCM 0x0001
44 
45 #define DEFAULT_BLOCK_SIZE 256
46 
47 #define TYPESIZE 4
48 #define CHANSIZE 0
49 #define LPCQSIZE 2
50 #define ENERGYSIZE 3
51 #define BITSHIFTSIZE 2
52 
53 #define TYPE_S8 1
54 #define TYPE_U8 2
55 #define TYPE_S16HL 3
56 #define TYPE_U16HL 4
57 #define TYPE_S16LH 5
58 #define TYPE_U16LH 6
59 
60 #define NWRAP 3
61 #define NSKIPSIZE 1
62 
63 #define LPCQUANT 5
64 #define V2LPCQOFFSET (1 << LPCQUANT)
65 
66 #define FNSIZE 2
67 #define FN_DIFF0 0
68 #define FN_DIFF1 1
69 #define FN_DIFF2 2
70 #define FN_DIFF3 3
71 #define FN_QUIT 4
72 #define FN_BLOCKSIZE 5
73 #define FN_BITSHIFT 6
74 #define FN_QLPC 7
75 #define FN_ZERO 8
76 #define FN_VERBATIM 9
77 
78 /** indicates if the FN_* command is audio or non-audio */
79 static const uint8_t is_audio_command[10] = { 1, 1, 1, 1, 0, 0, 0, 1, 1, 0 };
80 
81 #define VERBATIM_CKSIZE_SIZE 5
82 #define VERBATIM_BYTE_SIZE 8
83 #define CANONICAL_HEADER_SIZE 44
84 
85 typedef struct ShortenContext {
88 
90  unsigned channels;
91 
95  int *coeffs;
102  int version;
103  int cur_chan;
104  int bitshift;
105  int nmean;
107  int nwrap;
109  int bitindex;
113  int swap;
116 
118 {
119  ShortenContext *s = avctx->priv_data;
120  s->avctx = avctx;
121 
122  ff_bswapdsp_init(&s->bdsp);
123 
124  return 0;
125 }
126 
128 {
129  int i, chan, err;
130 
131  for (chan = 0; chan < s->channels; chan++) {
132  if (FFMAX(1, s->nmean) >= UINT_MAX / sizeof(int32_t)) {
133  av_log(s->avctx, AV_LOG_ERROR, "nmean too large\n");
134  return AVERROR_INVALIDDATA;
135  }
136  if (s->blocksize + (uint64_t)s->nwrap >= UINT_MAX / sizeof(int32_t)) {
138  "s->blocksize + s->nwrap too large\n");
139  return AVERROR_INVALIDDATA;
140  }
141 
142  if ((err = av_reallocp_array(&s->offset[chan],
143  sizeof(int32_t),
144  FFMAX(1, s->nmean))) < 0)
145  return err;
146 
147  if ((err = av_reallocp_array(&s->decoded_base[chan], (s->blocksize + s->nwrap),
148  sizeof(s->decoded_base[0][0]))) < 0)
149  return err;
150  for (i = 0; i < s->nwrap; i++)
151  s->decoded_base[chan][i] = 0;
152  s->decoded[chan] = s->decoded_base[chan] + s->nwrap;
153  }
154 
155  if ((err = av_reallocp_array(&s->coeffs, s->nwrap, sizeof(*s->coeffs))) < 0)
156  return err;
157 
158  return 0;
159 }
160 
161 static inline unsigned int get_uint(ShortenContext *s, int k)
162 {
163  if (s->version != 0)
165  return get_ur_golomb_shorten(&s->gb, k);
166 }
167 
169 {
170  int i;
171 
172  if (s->bitshift == 32) {
173  for (i = 0; i < s->blocksize; i++)
174  buffer[i] = 0;
175  } else if (s->bitshift != 0) {
176  for (i = 0; i < s->blocksize; i++)
177  buffer[i] <<= s->bitshift;
178  }
179 }
180 
182 {
183  int32_t mean = 0;
184  int chan, i;
185  int nblock = FFMAX(1, s->nmean);
186  /* initialise offset */
187  switch (s->internal_ftype) {
188  case TYPE_U8:
190  mean = 0x80;
191  break;
192  case TYPE_S16HL:
193  case TYPE_S16LH:
195  break;
196  default:
197  av_log(s->avctx, AV_LOG_ERROR, "unknown audio type\n");
198  return AVERROR_PATCHWELCOME;
199  }
200 
201  for (chan = 0; chan < s->channels; chan++)
202  for (i = 0; i < nblock; i++)
203  s->offset[chan][i] = mean;
204  return 0;
205 }
206 
208  int header_size)
209 {
210  ShortenContext *s = avctx->priv_data;
211  int len, bps, exp;
212  GetByteContext gb;
213  uint64_t val;
214  uint32_t tag;
215 
216  bytestream2_init(&gb, header, header_size);
217 
218  if (bytestream2_get_le32(&gb) != MKTAG('F', 'O', 'R', 'M')) {
219  av_log(avctx, AV_LOG_ERROR, "missing FORM tag\n");
220  return AVERROR_INVALIDDATA;
221  }
222 
223  bytestream2_skip(&gb, 4); /* chunk size */
224 
225  tag = bytestream2_get_le32(&gb);
226  if (tag != MKTAG('A', 'I', 'F', 'F') &&
227  tag != MKTAG('A', 'I', 'F', 'C')) {
228  av_log(avctx, AV_LOG_ERROR, "missing AIFF tag\n");
229  return AVERROR_INVALIDDATA;
230  }
231 
232  while (bytestream2_get_le32(&gb) != MKTAG('C', 'O', 'M', 'M')) {
233  len = bytestream2_get_be32(&gb);
234  bytestream2_skip(&gb, len + (len & 1));
235  if (len < 0 || bytestream2_get_bytes_left(&gb) < 18) {
236  av_log(avctx, AV_LOG_ERROR, "no COMM chunk found\n");
237  return AVERROR_INVALIDDATA;
238  }
239  }
240  len = bytestream2_get_be32(&gb);
241 
242  if (len < 18) {
243  av_log(avctx, AV_LOG_ERROR, "COMM chunk was too short\n");
244  return AVERROR_INVALIDDATA;
245  }
246 
247  bytestream2_skip(&gb, 6);
248  bps = bytestream2_get_be16(&gb);
249  avctx->bits_per_coded_sample = bps;
250 
251  s->swap = tag == MKTAG('A', 'I', 'F', 'C');
252 
253  if (bps != 16 && bps != 8) {
254  av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps);
255  return AVERROR(ENOSYS);
256  }
257 
258  exp = bytestream2_get_be16(&gb) - 16383 - 63;
259  val = bytestream2_get_be64(&gb);
260  if (exp < -63 || exp > 63) {
261  av_log(avctx, AV_LOG_ERROR, "exp %d is out of range\n", exp);
262  return AVERROR_INVALIDDATA;
263  }
264  if (exp >= 0)
265  avctx->sample_rate = val << exp;
266  else
267  avctx->sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
268  len -= 18;
269  if (len > 0)
270  av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
271 
272  return 0;
273 }
274 
276  int header_size)
277 {
278  int len, bps;
279  short wave_format;
280  GetByteContext gb;
281 
282  bytestream2_init(&gb, header, header_size);
283 
284  if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) {
285  av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
286  return AVERROR_INVALIDDATA;
287  }
288 
289  bytestream2_skip(&gb, 4); /* chunk size */
290 
291  if (bytestream2_get_le32(&gb) != MKTAG('W', 'A', 'V', 'E')) {
292  av_log(avctx, AV_LOG_ERROR, "missing WAVE tag\n");
293  return AVERROR_INVALIDDATA;
294  }
295 
296  while (bytestream2_get_le32(&gb) != MKTAG('f', 'm', 't', ' ')) {
297  len = bytestream2_get_le32(&gb);
298  bytestream2_skip(&gb, len);
299  if (len < 0 || bytestream2_get_bytes_left(&gb) < 16) {
300  av_log(avctx, AV_LOG_ERROR, "no fmt chunk found\n");
301  return AVERROR_INVALIDDATA;
302  }
303  }
304  len = bytestream2_get_le32(&gb);
305 
306  if (len < 16) {
307  av_log(avctx, AV_LOG_ERROR, "fmt chunk was too short\n");
308  return AVERROR_INVALIDDATA;
309  }
310 
311  wave_format = bytestream2_get_le16(&gb);
312 
313  switch (wave_format) {
314  case WAVE_FORMAT_PCM:
315  break;
316  default:
317  av_log(avctx, AV_LOG_ERROR, "unsupported wave format\n");
318  return AVERROR(ENOSYS);
319  }
320 
321  bytestream2_skip(&gb, 2); // skip channels (already got from shorten header)
322  avctx->sample_rate = bytestream2_get_le32(&gb);
323  bytestream2_skip(&gb, 4); // skip bit rate (represents original uncompressed bit rate)
324  bytestream2_skip(&gb, 2); // skip block align (not needed)
325  bps = bytestream2_get_le16(&gb);
326  avctx->bits_per_coded_sample = bps;
327 
328  if (bps != 16 && bps != 8) {
329  av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps);
330  return AVERROR(ENOSYS);
331  }
332 
333  len -= 16;
334  if (len > 0)
335  av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
336 
337  return 0;
338 }
339 
340 static const int fixed_coeffs[][3] = {
341  { 0, 0, 0 },
342  { 1, 0, 0 },
343  { 2, -1, 0 },
344  { 3, -3, 1 }
345 };
346 
348  int residual_size, int32_t coffset)
349 {
350  int pred_order, sum, qshift, init_sum, i, j;
351  const int *coeffs;
352 
353  if (command == FN_QLPC) {
354  /* read/validate prediction order */
355  pred_order = get_ur_golomb_shorten(&s->gb, LPCQSIZE);
356  if ((unsigned)pred_order > s->nwrap) {
357  av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n",
358  pred_order);
359  return AVERROR(EINVAL);
360  }
361  /* read LPC coefficients */
362  for (i = 0; i < pred_order; i++)
363  s->coeffs[i] = get_sr_golomb_shorten(&s->gb, LPCQUANT);
364  coeffs = s->coeffs;
365 
366  qshift = LPCQUANT;
367  } else {
368  /* fixed LPC coeffs */
369  pred_order = command;
370  if (pred_order >= FF_ARRAY_ELEMS(fixed_coeffs)) {
371  av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n",
372  pred_order);
373  return AVERROR_INVALIDDATA;
374  }
375  coeffs = fixed_coeffs[pred_order];
376  qshift = 0;
377  }
378 
379  /* subtract offset from previous samples to use in prediction */
380  if (command == FN_QLPC && coffset)
381  for (i = -pred_order; i < 0; i++)
382  s->decoded[channel][i] -= coffset;
383 
384  /* decode residual and do LPC prediction */
385  init_sum = pred_order ? (command == FN_QLPC ? s->lpcqoffset : 0) : coffset;
386  for (i = 0; i < s->blocksize; i++) {
387  sum = init_sum;
388  for (j = 0; j < pred_order; j++)
389  sum += coeffs[j] * s->decoded[channel][i - j - 1];
390  s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) +
391  (sum >> qshift);
392  }
393 
394  /* add offset to current samples */
395  if (command == FN_QLPC && coffset)
396  for (i = 0; i < s->blocksize; i++)
397  s->decoded[channel][i] += coffset;
398 
399  return 0;
400 }
401 
403 {
404  int i, ret;
405  int maxnlpc = 0;
406  /* shorten signature */
407  if (get_bits_long(&s->gb, 32) != AV_RB32("ajkg")) {
408  av_log(s->avctx, AV_LOG_ERROR, "missing shorten magic 'ajkg'\n");
409  return AVERROR_INVALIDDATA;
410  }
411 
412  s->lpcqoffset = 0;
414  s->nmean = -1;
415  s->version = get_bits(&s->gb, 8);
417 
418  s->channels = get_uint(s, CHANSIZE);
419  if (!s->channels) {
420  av_log(s->avctx, AV_LOG_ERROR, "No channels reported\n");
421  return AVERROR_INVALIDDATA;
422  }
423  if (s->channels > MAX_CHANNELS) {
424  av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels);
425  s->channels = 0;
426  return AVERROR_INVALIDDATA;
427  }
428  s->avctx->channels = s->channels;
429 
430  /* get blocksize if version > 0 */
431  if (s->version > 0) {
432  int skip_bytes;
433  unsigned blocksize;
434 
435  blocksize = get_uint(s, av_log2(DEFAULT_BLOCK_SIZE));
436  if (!blocksize || blocksize > MAX_BLOCKSIZE) {
438  "invalid or unsupported block size: %d\n",
439  blocksize);
440  return AVERROR(EINVAL);
441  }
442  s->blocksize = blocksize;
443 
444  maxnlpc = get_uint(s, LPCQSIZE);
445  s->nmean = get_uint(s, 0);
446 
447  skip_bytes = get_uint(s, NSKIPSIZE);
448  if ((unsigned)skip_bytes > get_bits_left(&s->gb)/8) {
449  av_log(s->avctx, AV_LOG_ERROR, "invalid skip_bytes: %d\n", skip_bytes);
450  return AVERROR_INVALIDDATA;
451  }
452 
453  for (i = 0; i < skip_bytes; i++)
454  skip_bits(&s->gb, 8);
455  }
456  s->nwrap = FFMAX(NWRAP, maxnlpc);
457 
458  if ((ret = allocate_buffers(s)) < 0)
459  return ret;
460 
461  if ((ret = init_offset(s)) < 0)
462  return ret;
463 
464  if (s->version > 1)
466 
467  if (s->avctx->extradata_size > 0)
468  goto end;
469 
472  "missing verbatim section at beginning of stream\n");
473  return AVERROR_INVALIDDATA;
474  }
475 
477  if (s->header_size >= OUT_BUFFER_SIZE ||
479  av_log(s->avctx, AV_LOG_ERROR, "header is wrong size: %d\n",
480  s->header_size);
481  return AVERROR_INVALIDDATA;
482  }
483 
484  for (i = 0; i < s->header_size; i++)
486 
487  if (AV_RL32(s->header) == MKTAG('R','I','F','F')) {
488  if ((ret = decode_wave_header(s->avctx, s->header, s->header_size)) < 0)
489  return ret;
490  } else if (AV_RL32(s->header) == MKTAG('F','O','R','M')) {
491  if ((ret = decode_aiff_header(s->avctx, s->header, s->header_size)) < 0)
492  return ret;
493  } else {
494  avpriv_report_missing_feature(s->avctx, "unsupported bit packing %"
495  PRIX32, AV_RL32(s->header));
496  return AVERROR_PATCHWELCOME;
497  }
498 
499 end:
500  s->cur_chan = 0;
501  s->bitshift = 0;
502 
503  s->got_header = 1;
504 
505  return 0;
506 }
507 
508 static int shorten_decode_frame(AVCodecContext *avctx, void *data,
509  int *got_frame_ptr, AVPacket *avpkt)
510 {
511  AVFrame *frame = data;
512  const uint8_t *buf = avpkt->data;
513  int buf_size = avpkt->size;
514  ShortenContext *s = avctx->priv_data;
515  int i, input_buf_size = 0;
516  int ret;
517 
518  /* allocate internal bitstream buffer */
519  if (s->max_framesize == 0) {
520  void *tmp_ptr;
521  s->max_framesize = 8192; // should hopefully be enough for the first header
524  if (!tmp_ptr) {
525  s->max_framesize = 0;
526  av_log(avctx, AV_LOG_ERROR, "error allocating bitstream buffer\n");
527  return AVERROR(ENOMEM);
528  }
529  memset(tmp_ptr, 0, s->allocated_bitstream_size);
530  s->bitstream = tmp_ptr;
531  }
532 
533  /* append current packet data to bitstream buffer */
534  buf_size = FFMIN(buf_size, s->max_framesize - s->bitstream_size);
535  input_buf_size = buf_size;
536 
539  memmove(s->bitstream, &s->bitstream[s->bitstream_index],
540  s->bitstream_size);
541  s->bitstream_index = 0;
542  }
543  if (buf)
544  memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], buf,
545  buf_size);
546  buf = &s->bitstream[s->bitstream_index];
547  buf_size += s->bitstream_size;
548  s->bitstream_size = buf_size;
549 
550  /* do not decode until buffer has at least max_framesize bytes or
551  * the end of the file has been reached */
552  if (buf_size < s->max_framesize && avpkt->data) {
553  *got_frame_ptr = 0;
554  return input_buf_size;
555  }
556  /* init and position bitstream reader */
557  if ((ret = init_get_bits8(&s->gb, buf, buf_size)) < 0)
558  return ret;
559  skip_bits(&s->gb, s->bitindex);
560 
561  /* process header or next subblock */
562  if (!s->got_header) {
563 
564  if ((ret = read_header(s)) < 0)
565  return ret;
566 
567  if (avpkt->size) {
568  int max_framesize;
569  void *tmp_ptr;
570 
571  max_framesize = FFMAX(s->max_framesize, s->blocksize * s->channels * 8);
573  max_framesize + AV_INPUT_BUFFER_PADDING_SIZE);
574  if (!tmp_ptr) {
575  av_log(avctx, AV_LOG_ERROR, "error allocating bitstream buffer\n");
576  return AVERROR(ENOMEM);
577  }
578  s->bitstream = tmp_ptr;
579  s->max_framesize = max_framesize;
580  *got_frame_ptr = 0;
581  goto finish_frame;
582  }
583  }
584 
585  /* if quit command was read previously, don't decode anything */
586  if (s->got_quit_command) {
587  *got_frame_ptr = 0;
588  return avpkt->size;
589  }
590 
591  s->cur_chan = 0;
592  while (s->cur_chan < s->channels) {
593  unsigned cmd;
594  int len;
595 
596  if (get_bits_left(&s->gb) < 3 + FNSIZE) {
597  *got_frame_ptr = 0;
598  break;
599  }
600 
601  cmd = get_ur_golomb_shorten(&s->gb, FNSIZE);
602 
603  if (cmd > FN_VERBATIM) {
604  av_log(avctx, AV_LOG_ERROR, "unknown shorten function %d\n", cmd);
605  *got_frame_ptr = 0;
606  break;
607  }
608 
609  if (!is_audio_command[cmd]) {
610  /* process non-audio command */
611  switch (cmd) {
612  case FN_VERBATIM:
614  while (len--)
616  break;
617  case FN_BITSHIFT: {
618  unsigned bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE);
619  if (bitshift > 32) {
620  av_log(avctx, AV_LOG_ERROR, "bitshift %d is invalid\n",
621  bitshift);
622  return AVERROR_INVALIDDATA;
623  }
624  s->bitshift = bitshift;
625  break;
626  }
627  case FN_BLOCKSIZE: {
628  unsigned blocksize = get_uint(s, av_log2(s->blocksize));
629  if (blocksize > s->blocksize) {
630  av_log(avctx, AV_LOG_ERROR,
631  "Increasing block size is not supported\n");
632  return AVERROR_PATCHWELCOME;
633  }
634  if (!blocksize || blocksize > MAX_BLOCKSIZE) {
635  av_log(avctx, AV_LOG_ERROR, "invalid or unsupported "
636  "block size: %d\n", blocksize);
637  return AVERROR(EINVAL);
638  }
639  s->blocksize = blocksize;
640  break;
641  }
642  case FN_QUIT:
643  s->got_quit_command = 1;
644  break;
645  }
646  if (cmd == FN_QUIT)
647  break;
648  } else {
649  /* process audio command */
650  int residual_size = 0;
651  int channel = s->cur_chan;
652  int32_t coffset;
653 
654  /* get Rice code for residual decoding */
655  if (cmd != FN_ZERO) {
656  residual_size = get_ur_golomb_shorten(&s->gb, ENERGYSIZE);
657  /* This is a hack as version 0 differed in the definition
658  * of get_sr_golomb_shorten(). */
659  if (s->version == 0)
660  residual_size--;
661  }
662 
663  /* calculate sample offset using means from previous blocks */
664  if (s->nmean == 0)
665  coffset = s->offset[channel][0];
666  else {
667  int32_t sum = (s->version < 2) ? 0 : s->nmean / 2;
668  for (i = 0; i < s->nmean; i++)
669  sum += s->offset[channel][i];
670  coffset = sum / s->nmean;
671  if (s->version >= 2)
672  coffset = s->bitshift == 0 ? coffset : coffset >> s->bitshift - 1 >> 1;
673  }
674 
675  /* decode samples for this channel */
676  if (cmd == FN_ZERO) {
677  for (i = 0; i < s->blocksize; i++)
678  s->decoded[channel][i] = 0;
679  } else {
680  if ((ret = decode_subframe_lpc(s, cmd, channel,
681  residual_size, coffset)) < 0)
682  return ret;
683  }
684 
685  /* update means with info from the current block */
686  if (s->nmean > 0) {
687  int32_t sum = (s->version < 2) ? 0 : s->blocksize / 2;
688  for (i = 0; i < s->blocksize; i++)
689  sum += s->decoded[channel][i];
690 
691  for (i = 1; i < s->nmean; i++)
692  s->offset[channel][i - 1] = s->offset[channel][i];
693 
694  if (s->version < 2)
695  s->offset[channel][s->nmean - 1] = sum / s->blocksize;
696  else
697  s->offset[channel][s->nmean - 1] = s->bitshift == 32 ? 0 : (sum / s->blocksize) << s->bitshift;
698  }
699 
700  /* copy wrap samples for use with next block */
701  for (i = -s->nwrap; i < 0; i++)
702  s->decoded[channel][i] = s->decoded[channel][i + s->blocksize];
703 
704  /* shift samples to add in unused zero bits which were removed
705  * during encoding */
706  fix_bitshift(s, s->decoded[channel]);
707 
708  /* if this is the last channel in the block, output the samples */
709  s->cur_chan++;
710  if (s->cur_chan == s->channels) {
711  uint8_t *samples_u8;
712  int16_t *samples_s16;
713  int chan;
714 
715  /* get output buffer */
716  frame->nb_samples = s->blocksize;
717  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
718  return ret;
719 
720  for (chan = 0; chan < s->channels; chan++) {
721  samples_u8 = ((uint8_t **)frame->extended_data)[chan];
722  samples_s16 = ((int16_t **)frame->extended_data)[chan];
723  for (i = 0; i < s->blocksize; i++) {
724  switch (s->internal_ftype) {
725  case TYPE_U8:
726  *samples_u8++ = av_clip_uint8(s->decoded[chan][i]);
727  break;
728  case TYPE_S16HL:
729  case TYPE_S16LH:
730  *samples_s16++ = av_clip_int16(s->decoded[chan][i]);
731  break;
732  }
733  }
734  if (s->swap && s->internal_ftype != TYPE_U8)
735  s->bdsp.bswap16_buf(((uint16_t **)frame->extended_data)[chan],
736  ((uint16_t **)frame->extended_data)[chan],
737  s->blocksize);
738 
739  }
740 
741  *got_frame_ptr = 1;
742  }
743  }
744  }
745  if (s->cur_chan < s->channels)
746  *got_frame_ptr = 0;
747 
749  s->bitindex = get_bits_count(&s->gb) - 8 * (get_bits_count(&s->gb) / 8);
750  i = get_bits_count(&s->gb) / 8;
751  if (i > buf_size) {
752  av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", i - buf_size);
753  s->bitstream_size = 0;
754  s->bitstream_index = 0;
755  return AVERROR_INVALIDDATA;
756  }
757  if (s->bitstream_size) {
758  s->bitstream_index += i;
759  s->bitstream_size -= i;
760  return input_buf_size;
761  } else
762  return i;
763 }
764 
766 {
767  ShortenContext *s = avctx->priv_data;
768  int i;
769 
770  for (i = 0; i < s->channels; i++) {
771  s->decoded[i] = NULL;
772  av_freep(&s->decoded_base[i]);
773  av_freep(&s->offset[i]);
774  }
775  av_freep(&s->bitstream);
776  av_freep(&s->coeffs);
777 
778  return 0;
779 }
780 
782  .name = "shorten",
783  .long_name = NULL_IF_CONFIG_SMALL("Shorten"),
784  .type = AVMEDIA_TYPE_AUDIO,
785  .id = AV_CODEC_ID_SHORTEN,
786  .priv_data_size = sizeof(ShortenContext),
788  .close = shorten_decode_close,
791  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
794 };
#define NSKIPSIZE
Definition: shorten.c:61
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:771
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:187
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
#define ENERGYSIZE
Definition: shorten.c:50
#define VERBATIM_CKSIZE_SIZE
Definition: shorten.c:81
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
int internal_ftype
Definition: shorten.c:106
static int init_offset(ShortenContext *s)
Definition: shorten.c:181
#define FN_BITSHIFT
Definition: shorten.c:73
void(* bswap16_buf)(uint16_t *dst, const uint16_t *src, int len)
Definition: bswapdsp.h:26
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define OUT_BUFFER_SIZE
Definition: shorten.c:39
unsigned int allocated_bitstream_size
Definition: shorten.c:99
int32_t * decoded[MAX_CHANNELS]
Definition: shorten.c:92
int size
Definition: avcodec.h:1648
static const int fixed_coeffs[][3]
Definition: shorten.c:340
int av_log2(unsigned v)
Definition: intmath.c:26
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
static int finish_frame(AVCodecContext *avctx, AVFrame *pict)
Definition: rv34.c:1603
AVCodec.
Definition: avcodec.h:3671
AVCodec ff_shorten_decoder
Definition: shorten.c:781
static av_cold int shorten_decode_init(AVCodecContext *avctx)
Definition: shorten.c:117
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:1019
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2492
uint8_t
#define av_cold
Definition: attributes.h:82
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
static AVFrame * frame
#define LPCQSIZE
Definition: shorten.c:49
static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header, int header_size)
Definition: shorten.c:275
uint8_t * data
Definition: avcodec.h:1647
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
GetBitContext gb
Definition: shorten.c:87
uint32_t tag
Definition: movenc.c:1413
#define FNSIZE
Definition: shorten.c:66
bitstream reader API header.
#define FN_QLPC
Definition: shorten.c:74
#define FN_VERBATIM
Definition: shorten.c:76
static const uint8_t header[24]
Definition: sdr2.c:67
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3116
static av_unused const uint8_t * skip_bytes(CABACContext *c, int n)
Skip n bytes and reset the decoder.
AVCodecContext * avctx
Definition: shorten.c:86
int32_t * decoded_base[MAX_CHANNELS]
Definition: shorten.c:93
#define av_log(a,...)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:587
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int min_framesize
Definition: shorten.c:89
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:180
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
unsigned channels
Definition: shorten.c:90
static int decode_aiff_header(AVCodecContext *avctx, const uint8_t *header, int header_size)
Definition: shorten.c:207
const char * name
Name of the codec implementation.
Definition: avcodec.h:3678
#define FN_BLOCKSIZE
Definition: shorten.c:72
#define FFMAX(a, b)
Definition: common.h:94
#define BITSHIFTSIZE
Definition: shorten.c:51
int8_t exp
Definition: eval.c:65
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:191
#define NWRAP
Definition: shorten.c:60
int got_header
Definition: shorten.c:111
static int allocate_buffers(ShortenContext *s)
Definition: shorten.c:127
static void fix_bitshift(ShortenContext *s, int32_t *buffer)
Definition: shorten.c:168
int got_quit_command
Definition: shorten.c:112
#define FFMIN(a, b)
Definition: common.h:96
#define MAX_BLOCKSIZE
Definition: shorten.c:37
int32_t
#define TYPESIZE
Definition: shorten.c:47
#define FN_QUIT
Definition: shorten.c:71
#define LPCQUANT
Definition: shorten.c:63
#define VERBATIM_BYTE_SIZE
Definition: shorten.c:82
void * av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
Reallocate the given buffer if it is not large enough, otherwise do nothing.
Definition: mem.c:450
unsigned 8 bits, planar
Definition: samplefmt.h:66
#define FF_ARRAY_ELEMS(a)
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define CHANSIZE
Definition: shorten.c:48
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
Libavcodec external API header.
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
int sample_rate
samples per second
Definition: avcodec.h:2484
uint8_t header[OUT_BUFFER_SIZE]
Definition: shorten.c:101
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:456
#define CANONICAL_HEADER_SIZE
Definition: shorten.c:83
int bitstream_size
Definition: shorten.c:97
main external API structure.
Definition: avcodec.h:1722
static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Definition: vf_drawtext.c:770
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:953
static av_cold int shorten_decode_close(AVCodecContext *avctx)
Definition: shorten.c:765
void * buf
Definition: avisynth_c.h:690
#define MAX_CHANNELS
Definition: shorten.c:36
int extradata_size
Definition: avcodec.h:1838
BswapDSPContext bdsp
Definition: shorten.c:114
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:306
#define AV_CODEC_CAP_SUBFRAMES
Codec can output multiple frames per AVPacket Normally demuxers return one frame at a time...
Definition: avcodec.h:1044
int * coeffs
Definition: shorten.c:95
static int decode_subframe_lpc(ShortenContext *s, int command, int channel, int residual_size, int32_t coffset)
Definition: shorten.c:347
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:346
#define TYPE_S16HL
Definition: shorten.c:55
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
static unsigned int get_uint(ShortenContext *s, int k)
Definition: shorten.c:161
#define DEFAULT_BLOCK_SIZE
Definition: shorten.c:45
#define ULONGSIZE
Definition: shorten.c:41
static int shorten_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Definition: shorten.c:508
common internal api header.
if(ret< 0)
Definition: vf_mcdeint.c:282
channel
Use these values when setting the channel map with ebur128_set_channel().
Definition: ebur128.h:39
uint8_t * bitstream
Definition: shorten.c:96
unsigned bps
Definition: movenc.c:1414
#define FN_ZERO
Definition: shorten.c:75
int max_framesize
Definition: shorten.c:89
int bitstream_index
Definition: shorten.c:98
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:769
int header_size
Definition: shorten.c:100
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
void * priv_data
Definition: avcodec.h:1764
int32_t * offset[MAX_CHANNELS]
Definition: shorten.c:94
#define WAVE_FORMAT_PCM
Definition: shorten.c:43
static const int16_t coeffs[]
int len
int channels
number of audio channels
Definition: avcodec.h:2485
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
#define av_freep(p)
signed 16 bits, planar
Definition: samplefmt.h:67
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2243
int32_t lpcqoffset
Definition: shorten.c:110
static const uint8_t is_audio_command[10]
indicates if the FN_* command is audio or non-audio
Definition: shorten.c:79
#define V2LPCQOFFSET
Definition: shorten.c:64
static int read_header(ShortenContext *s)
Definition: shorten.c:402
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:234
static unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k)
read unsigned golomb rice code (shorten).
Definition: golomb.h:390
#define MKTAG(a, b, c, d)
Definition: common.h:342
exp golomb vlc stuff
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1624
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:244
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:994
for(j=16;j >0;--j)
#define TYPE_U8
Definition: shorten.c:54
GLuint buffer
Definition: opengl_enc.c:102
#define TYPE_S16LH
Definition: shorten.c:57
static int get_sr_golomb_shorten(GetBitContext *gb, int k)
read signed golomb rice code (shorten).
Definition: golomb.h:398