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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  if (k > 31U)
166  return AVERROR_INVALIDDATA;
167  }
168  return get_ur_golomb_shorten(&s->gb, k);
169 }
170 
172 {
173  int i;
174 
175  if (s->bitshift == 32) {
176  for (i = 0; i < s->blocksize; i++)
177  buffer[i] = 0;
178  } else if (s->bitshift != 0) {
179  for (i = 0; i < s->blocksize; i++)
180  buffer[i] <<= s->bitshift;
181  }
182 }
183 
185 {
186  int32_t mean = 0;
187  int chan, i;
188  int nblock = FFMAX(1, s->nmean);
189  /* initialise offset */
190  switch (s->internal_ftype) {
191  case TYPE_U8:
193  mean = 0x80;
194  break;
195  case TYPE_S16HL:
196  case TYPE_S16LH:
198  break;
199  default:
200  av_log(s->avctx, AV_LOG_ERROR, "unknown audio type\n");
201  return AVERROR_PATCHWELCOME;
202  }
203 
204  for (chan = 0; chan < s->channels; chan++)
205  for (i = 0; i < nblock; i++)
206  s->offset[chan][i] = mean;
207  return 0;
208 }
209 
211  int header_size)
212 {
213  ShortenContext *s = avctx->priv_data;
214  int len, bps, exp;
215  GetByteContext gb;
216  uint64_t val;
217  uint32_t tag;
218 
219  bytestream2_init(&gb, header, header_size);
220 
221  if (bytestream2_get_le32(&gb) != MKTAG('F', 'O', 'R', 'M')) {
222  av_log(avctx, AV_LOG_ERROR, "missing FORM tag\n");
223  return AVERROR_INVALIDDATA;
224  }
225 
226  bytestream2_skip(&gb, 4); /* chunk size */
227 
228  tag = bytestream2_get_le32(&gb);
229  if (tag != MKTAG('A', 'I', 'F', 'F') &&
230  tag != MKTAG('A', 'I', 'F', 'C')) {
231  av_log(avctx, AV_LOG_ERROR, "missing AIFF tag\n");
232  return AVERROR_INVALIDDATA;
233  }
234 
235  while (bytestream2_get_le32(&gb) != MKTAG('C', 'O', 'M', 'M')) {
236  len = bytestream2_get_be32(&gb);
237  bytestream2_skip(&gb, len + (len & 1));
238  if (len < 0 || bytestream2_get_bytes_left(&gb) < 18) {
239  av_log(avctx, AV_LOG_ERROR, "no COMM chunk found\n");
240  return AVERROR_INVALIDDATA;
241  }
242  }
243  len = bytestream2_get_be32(&gb);
244 
245  if (len < 18) {
246  av_log(avctx, AV_LOG_ERROR, "COMM chunk was too short\n");
247  return AVERROR_INVALIDDATA;
248  }
249 
250  bytestream2_skip(&gb, 6);
251  bps = bytestream2_get_be16(&gb);
252  avctx->bits_per_coded_sample = bps;
253 
254  s->swap = tag == MKTAG('A', 'I', 'F', 'C');
255 
256  if (bps != 16 && bps != 8) {
257  av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps);
258  return AVERROR(ENOSYS);
259  }
260 
261  exp = bytestream2_get_be16(&gb) - 16383 - 63;
262  val = bytestream2_get_be64(&gb);
263  if (exp < -63 || exp > 63) {
264  av_log(avctx, AV_LOG_ERROR, "exp %d is out of range\n", exp);
265  return AVERROR_INVALIDDATA;
266  }
267  if (exp >= 0)
268  avctx->sample_rate = val << exp;
269  else
270  avctx->sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
271  len -= 18;
272  if (len > 0)
273  av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
274 
275  return 0;
276 }
277 
279  int header_size)
280 {
281  int len, bps;
282  short wave_format;
283  GetByteContext gb;
284 
285  bytestream2_init(&gb, header, header_size);
286 
287  if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) {
288  av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
289  return AVERROR_INVALIDDATA;
290  }
291 
292  bytestream2_skip(&gb, 4); /* chunk size */
293 
294  if (bytestream2_get_le32(&gb) != MKTAG('W', 'A', 'V', 'E')) {
295  av_log(avctx, AV_LOG_ERROR, "missing WAVE tag\n");
296  return AVERROR_INVALIDDATA;
297  }
298 
299  while (bytestream2_get_le32(&gb) != MKTAG('f', 'm', 't', ' ')) {
300  len = bytestream2_get_le32(&gb);
301  bytestream2_skip(&gb, len);
302  if (len < 0 || bytestream2_get_bytes_left(&gb) < 16) {
303  av_log(avctx, AV_LOG_ERROR, "no fmt chunk found\n");
304  return AVERROR_INVALIDDATA;
305  }
306  }
307  len = bytestream2_get_le32(&gb);
308 
309  if (len < 16) {
310  av_log(avctx, AV_LOG_ERROR, "fmt chunk was too short\n");
311  return AVERROR_INVALIDDATA;
312  }
313 
314  wave_format = bytestream2_get_le16(&gb);
315 
316  switch (wave_format) {
317  case WAVE_FORMAT_PCM:
318  break;
319  default:
320  av_log(avctx, AV_LOG_ERROR, "unsupported wave format\n");
321  return AVERROR(ENOSYS);
322  }
323 
324  bytestream2_skip(&gb, 2); // skip channels (already got from shorten header)
325  avctx->sample_rate = bytestream2_get_le32(&gb);
326  bytestream2_skip(&gb, 4); // skip bit rate (represents original uncompressed bit rate)
327  bytestream2_skip(&gb, 2); // skip block align (not needed)
328  bps = bytestream2_get_le16(&gb);
329  avctx->bits_per_coded_sample = bps;
330 
331  if (bps != 16 && bps != 8) {
332  av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps);
333  return AVERROR(ENOSYS);
334  }
335 
336  len -= 16;
337  if (len > 0)
338  av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
339 
340  return 0;
341 }
342 
343 static const int fixed_coeffs[][3] = {
344  { 0, 0, 0 },
345  { 1, 0, 0 },
346  { 2, -1, 0 },
347  { 3, -3, 1 }
348 };
349 
351  int residual_size, int32_t coffset)
352 {
353  int pred_order, sum, qshift, init_sum, i, j;
354  const int *coeffs;
355 
356  if (command == FN_QLPC) {
357  /* read/validate prediction order */
358  pred_order = get_ur_golomb_shorten(&s->gb, LPCQSIZE);
359  if ((unsigned)pred_order > s->nwrap) {
360  av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n",
361  pred_order);
362  return AVERROR(EINVAL);
363  }
364  /* read LPC coefficients */
365  for (i = 0; i < pred_order; i++)
366  s->coeffs[i] = get_sr_golomb_shorten(&s->gb, LPCQUANT);
367  coeffs = s->coeffs;
368 
369  qshift = LPCQUANT;
370  } else {
371  /* fixed LPC coeffs */
372  pred_order = command;
373  if (pred_order >= FF_ARRAY_ELEMS(fixed_coeffs)) {
374  av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n",
375  pred_order);
376  return AVERROR_INVALIDDATA;
377  }
378  coeffs = fixed_coeffs[pred_order];
379  qshift = 0;
380  }
381 
382  /* subtract offset from previous samples to use in prediction */
383  if (command == FN_QLPC && coffset)
384  for (i = -pred_order; i < 0; i++)
385  s->decoded[channel][i] -= coffset;
386 
387  /* decode residual and do LPC prediction */
388  init_sum = pred_order ? (command == FN_QLPC ? s->lpcqoffset : 0) : coffset;
389  for (i = 0; i < s->blocksize; i++) {
390  sum = init_sum;
391  for (j = 0; j < pred_order; j++)
392  sum += coeffs[j] * s->decoded[channel][i - j - 1];
393  s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) +
394  (sum >> qshift);
395  }
396 
397  /* add offset to current samples */
398  if (command == FN_QLPC && coffset)
399  for (i = 0; i < s->blocksize; i++)
400  s->decoded[channel][i] += coffset;
401 
402  return 0;
403 }
404 
406 {
407  int i, ret;
408  int maxnlpc = 0;
409  /* shorten signature */
410  if (get_bits_long(&s->gb, 32) != AV_RB32("ajkg")) {
411  av_log(s->avctx, AV_LOG_ERROR, "missing shorten magic 'ajkg'\n");
412  return AVERROR_INVALIDDATA;
413  }
414 
415  s->lpcqoffset = 0;
417  s->nmean = -1;
418  s->version = get_bits(&s->gb, 8);
420 
421  s->channels = get_uint(s, CHANSIZE);
422  if (!s->channels) {
423  av_log(s->avctx, AV_LOG_ERROR, "No channels reported\n");
424  return AVERROR_INVALIDDATA;
425  }
426  if (s->channels > MAX_CHANNELS) {
427  av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels);
428  s->channels = 0;
429  return AVERROR_INVALIDDATA;
430  }
431  s->avctx->channels = s->channels;
432 
433  /* get blocksize if version > 0 */
434  if (s->version > 0) {
435  int skip_bytes;
436  unsigned blocksize;
437 
438  blocksize = get_uint(s, av_log2(DEFAULT_BLOCK_SIZE));
439  if (!blocksize || blocksize > MAX_BLOCKSIZE) {
441  "invalid or unsupported block size: %d\n",
442  blocksize);
443  return AVERROR(EINVAL);
444  }
445  s->blocksize = blocksize;
446 
447  maxnlpc = get_uint(s, LPCQSIZE);
448  s->nmean = get_uint(s, 0);
449 
450  skip_bytes = get_uint(s, NSKIPSIZE);
451  if ((unsigned)skip_bytes > get_bits_left(&s->gb)/8) {
452  av_log(s->avctx, AV_LOG_ERROR, "invalid skip_bytes: %d\n", skip_bytes);
453  return AVERROR_INVALIDDATA;
454  }
455 
456  for (i = 0; i < skip_bytes; i++)
457  skip_bits(&s->gb, 8);
458  }
459  s->nwrap = FFMAX(NWRAP, maxnlpc);
460 
461  if ((ret = allocate_buffers(s)) < 0)
462  return ret;
463 
464  if ((ret = init_offset(s)) < 0)
465  return ret;
466 
467  if (s->version > 1)
469 
470  if (s->avctx->extradata_size > 0)
471  goto end;
472 
475  "missing verbatim section at beginning of stream\n");
476  return AVERROR_INVALIDDATA;
477  }
478 
480  if (s->header_size >= OUT_BUFFER_SIZE ||
482  av_log(s->avctx, AV_LOG_ERROR, "header is wrong size: %d\n",
483  s->header_size);
484  return AVERROR_INVALIDDATA;
485  }
486 
487  for (i = 0; i < s->header_size; i++)
489 
490  if (AV_RL32(s->header) == MKTAG('R','I','F','F')) {
491  if ((ret = decode_wave_header(s->avctx, s->header, s->header_size)) < 0)
492  return ret;
493  } else if (AV_RL32(s->header) == MKTAG('F','O','R','M')) {
494  if ((ret = decode_aiff_header(s->avctx, s->header, s->header_size)) < 0)
495  return ret;
496  } else {
497  avpriv_report_missing_feature(s->avctx, "unsupported bit packing %"
498  PRIX32, AV_RL32(s->header));
499  return AVERROR_PATCHWELCOME;
500  }
501 
502 end:
503  s->cur_chan = 0;
504  s->bitshift = 0;
505 
506  s->got_header = 1;
507 
508  return 0;
509 }
510 
511 static int shorten_decode_frame(AVCodecContext *avctx, void *data,
512  int *got_frame_ptr, AVPacket *avpkt)
513 {
514  AVFrame *frame = data;
515  const uint8_t *buf = avpkt->data;
516  int buf_size = avpkt->size;
517  ShortenContext *s = avctx->priv_data;
518  int i, input_buf_size = 0;
519  int ret;
520 
521  /* allocate internal bitstream buffer */
522  if (s->max_framesize == 0) {
523  void *tmp_ptr;
524  s->max_framesize = 8192; // should hopefully be enough for the first header
527  if (!tmp_ptr) {
528  s->max_framesize = 0;
529  av_log(avctx, AV_LOG_ERROR, "error allocating bitstream buffer\n");
530  return AVERROR(ENOMEM);
531  }
532  memset(tmp_ptr, 0, s->allocated_bitstream_size);
533  s->bitstream = tmp_ptr;
534  }
535 
536  /* append current packet data to bitstream buffer */
537  buf_size = FFMIN(buf_size, s->max_framesize - s->bitstream_size);
538  input_buf_size = buf_size;
539 
542  memmove(s->bitstream, &s->bitstream[s->bitstream_index],
543  s->bitstream_size);
544  s->bitstream_index = 0;
545  }
546  if (buf)
547  memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], buf,
548  buf_size);
549  buf = &s->bitstream[s->bitstream_index];
550  buf_size += s->bitstream_size;
551  s->bitstream_size = buf_size;
552 
553  /* do not decode until buffer has at least max_framesize bytes or
554  * the end of the file has been reached */
555  if (buf_size < s->max_framesize && avpkt->data) {
556  *got_frame_ptr = 0;
557  return input_buf_size;
558  }
559  /* init and position bitstream reader */
560  if ((ret = init_get_bits8(&s->gb, buf, buf_size)) < 0)
561  return ret;
562  skip_bits(&s->gb, s->bitindex);
563 
564  /* process header or next subblock */
565  if (!s->got_header) {
566 
567  if ((ret = read_header(s)) < 0)
568  return ret;
569 
570  if (avpkt->size) {
571  int max_framesize;
572  void *tmp_ptr;
573 
574  max_framesize = FFMAX(s->max_framesize, s->blocksize * s->channels * 8);
576  max_framesize + AV_INPUT_BUFFER_PADDING_SIZE);
577  if (!tmp_ptr) {
578  av_log(avctx, AV_LOG_ERROR, "error allocating bitstream buffer\n");
579  return AVERROR(ENOMEM);
580  }
581  s->bitstream = tmp_ptr;
582  s->max_framesize = max_framesize;
583  *got_frame_ptr = 0;
584  goto finish_frame;
585  }
586  }
587 
588  /* if quit command was read previously, don't decode anything */
589  if (s->got_quit_command) {
590  *got_frame_ptr = 0;
591  return avpkt->size;
592  }
593 
594  s->cur_chan = 0;
595  while (s->cur_chan < s->channels) {
596  unsigned cmd;
597  int len;
598 
599  if (get_bits_left(&s->gb) < 3 + FNSIZE) {
600  *got_frame_ptr = 0;
601  break;
602  }
603 
604  cmd = get_ur_golomb_shorten(&s->gb, FNSIZE);
605 
606  if (cmd > FN_VERBATIM) {
607  av_log(avctx, AV_LOG_ERROR, "unknown shorten function %d\n", cmd);
608  *got_frame_ptr = 0;
609  break;
610  }
611 
612  if (!is_audio_command[cmd]) {
613  /* process non-audio command */
614  switch (cmd) {
615  case FN_VERBATIM:
617  while (len--)
619  break;
620  case FN_BITSHIFT: {
621  unsigned bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE);
622  if (bitshift > 32) {
623  av_log(avctx, AV_LOG_ERROR, "bitshift %d is invalid\n",
624  bitshift);
625  return AVERROR_INVALIDDATA;
626  }
627  s->bitshift = bitshift;
628  break;
629  }
630  case FN_BLOCKSIZE: {
631  unsigned blocksize = get_uint(s, av_log2(s->blocksize));
632  if (blocksize > s->blocksize) {
634  "Increasing block size");
635  return AVERROR_PATCHWELCOME;
636  }
637  if (!blocksize || blocksize > MAX_BLOCKSIZE) {
638  av_log(avctx, AV_LOG_ERROR, "invalid or unsupported "
639  "block size: %d\n", blocksize);
640  return AVERROR(EINVAL);
641  }
642  s->blocksize = blocksize;
643  break;
644  }
645  case FN_QUIT:
646  s->got_quit_command = 1;
647  break;
648  }
649  if (cmd == FN_QUIT)
650  break;
651  } else {
652  /* process audio command */
653  int residual_size = 0;
654  int channel = s->cur_chan;
655  int32_t coffset;
656 
657  /* get Rice code for residual decoding */
658  if (cmd != FN_ZERO) {
659  residual_size = get_ur_golomb_shorten(&s->gb, ENERGYSIZE);
660  /* This is a hack as version 0 differed in the definition
661  * of get_sr_golomb_shorten(). */
662  if (s->version == 0)
663  residual_size--;
664  if (residual_size > 30U) {
665  av_log(avctx, AV_LOG_ERROR, "residual size unsupportd: %d\n", residual_size);
666  return AVERROR_INVALIDDATA;
667  }
668  }
669 
670  /* calculate sample offset using means from previous blocks */
671  if (s->nmean == 0)
672  coffset = s->offset[channel][0];
673  else {
674  int32_t sum = (s->version < 2) ? 0 : s->nmean / 2;
675  for (i = 0; i < s->nmean; i++)
676  sum += s->offset[channel][i];
677  coffset = sum / s->nmean;
678  if (s->version >= 2)
679  coffset = s->bitshift == 0 ? coffset : coffset >> s->bitshift - 1 >> 1;
680  }
681 
682  /* decode samples for this channel */
683  if (cmd == FN_ZERO) {
684  for (i = 0; i < s->blocksize; i++)
685  s->decoded[channel][i] = 0;
686  } else {
687  if ((ret = decode_subframe_lpc(s, cmd, channel,
688  residual_size, coffset)) < 0)
689  return ret;
690  }
691 
692  /* update means with info from the current block */
693  if (s->nmean > 0) {
694  int32_t sum = (s->version < 2) ? 0 : s->blocksize / 2;
695  for (i = 0; i < s->blocksize; i++)
696  sum += s->decoded[channel][i];
697 
698  for (i = 1; i < s->nmean; i++)
699  s->offset[channel][i - 1] = s->offset[channel][i];
700 
701  if (s->version < 2)
702  s->offset[channel][s->nmean - 1] = sum / s->blocksize;
703  else
704  s->offset[channel][s->nmean - 1] = s->bitshift == 32 ? 0 : (sum / s->blocksize) << s->bitshift;
705  }
706 
707  /* copy wrap samples for use with next block */
708  for (i = -s->nwrap; i < 0; i++)
709  s->decoded[channel][i] = s->decoded[channel][i + s->blocksize];
710 
711  /* shift samples to add in unused zero bits which were removed
712  * during encoding */
713  fix_bitshift(s, s->decoded[channel]);
714 
715  /* if this is the last channel in the block, output the samples */
716  s->cur_chan++;
717  if (s->cur_chan == s->channels) {
718  uint8_t *samples_u8;
719  int16_t *samples_s16;
720  int chan;
721 
722  /* get output buffer */
723  frame->nb_samples = s->blocksize;
724  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
725  return ret;
726 
727  for (chan = 0; chan < s->channels; chan++) {
728  samples_u8 = ((uint8_t **)frame->extended_data)[chan];
729  samples_s16 = ((int16_t **)frame->extended_data)[chan];
730  for (i = 0; i < s->blocksize; i++) {
731  switch (s->internal_ftype) {
732  case TYPE_U8:
733  *samples_u8++ = av_clip_uint8(s->decoded[chan][i]);
734  break;
735  case TYPE_S16HL:
736  case TYPE_S16LH:
737  *samples_s16++ = av_clip_int16(s->decoded[chan][i]);
738  break;
739  }
740  }
741  if (s->swap && s->internal_ftype != TYPE_U8)
742  s->bdsp.bswap16_buf(((uint16_t **)frame->extended_data)[chan],
743  ((uint16_t **)frame->extended_data)[chan],
744  s->blocksize);
745 
746  }
747 
748  *got_frame_ptr = 1;
749  }
750  }
751  }
752  if (s->cur_chan < s->channels)
753  *got_frame_ptr = 0;
754 
756  s->bitindex = get_bits_count(&s->gb) - 8 * (get_bits_count(&s->gb) / 8);
757  i = get_bits_count(&s->gb) / 8;
758  if (i > buf_size) {
759  av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", i - buf_size);
760  s->bitstream_size = 0;
761  s->bitstream_index = 0;
762  return AVERROR_INVALIDDATA;
763  }
764  if (s->bitstream_size) {
765  s->bitstream_index += i;
766  s->bitstream_size -= i;
767  return input_buf_size;
768  } else
769  return i;
770 }
771 
773 {
774  ShortenContext *s = avctx->priv_data;
775  int i;
776 
777  for (i = 0; i < s->channels; i++) {
778  s->decoded[i] = NULL;
779  av_freep(&s->decoded_base[i]);
780  av_freep(&s->offset[i]);
781  }
782  av_freep(&s->bitstream);
783  av_freep(&s->coeffs);
784 
785  return 0;
786 }
787 
789  .name = "shorten",
790  .long_name = NULL_IF_CONFIG_SMALL("Shorten"),
791  .type = AVMEDIA_TYPE_AUDIO,
792  .id = AV_CODEC_ID_SHORTEN,
793  .priv_data_size = sizeof(ShortenContext),
795  .close = shorten_decode_close,
798  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
801 };
#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:194
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:184
#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:1669
static const int fixed_coeffs[][3]
Definition: shorten.c:343
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:3719
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
AVCodec ff_shorten_decoder
Definition: shorten.c:788
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:1023
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2513
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:278
uint8_t * data
Definition: avcodec.h:1668
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:1456
#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:3137
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,...)
#define U(x)
Definition: vp56_arith.h:37
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:179
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:210
const char * name
Name of the codec implementation.
Definition: avcodec.h:3726
#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:171
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:2505
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:1743
static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Definition: vf_drawtext.c:863
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1744
static av_cold int shorten_decode_close(AVCodecContext *avctx)
Definition: shorten.c:772
void * buf
Definition: avisynth_c.h:690
#define MAX_CHANNELS
Definition: shorten.c:36
int extradata_size
Definition: avcodec.h:1859
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:1048
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:350
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:511
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:1457
#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:773
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:1785
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:2506
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
#define av_freep(p)
signed 16 bits, planar
Definition: samplefmt.h:67
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:405
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:241
static unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k)
read unsigned golomb rice code (shorten).
Definition: golomb.h:392
#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:1645
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:260
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:998
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:400