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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / wmalosslessdec.c
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2ba45a60
DM		 1/*
2 * Windows Media Audio Lossless decoder
3 * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
4 * Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson
5 * Copyright (c) 2011 Andreas Öman
6 * Copyright (c) 2011 - 2012 Mashiat Sarker Shakkhar
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#include <inttypes.h>
26
27#include "libavutil/attributes.h"
28#include "libavutil/avassert.h"
29
30#include "avcodec.h"
31#include "internal.h"
32#include "get_bits.h"
33#include "put_bits.h"
34#include "lossless_audiodsp.h"
35#include "wma.h"
36#include "wma_common.h"
37
38/** current decoder limitations */
39#define WMALL_MAX_CHANNELS 8 ///< max number of handled channels
40#define MAX_SUBFRAMES 32 ///< max number of subframes per channel
41#define MAX_BANDS 29 ///< max number of scale factor bands
42#define MAX_FRAMESIZE 32768 ///< maximum compressed frame size
43#define MAX_ORDER 256
44
45#define WMALL_BLOCK_MIN_BITS 6 ///< log2 of min block size
46#define WMALL_BLOCK_MAX_BITS 14 ///< log2 of max block size
47#define WMALL_BLOCK_MAX_SIZE (1 << WMALL_BLOCK_MAX_BITS) ///< maximum block size
48#define WMALL_BLOCK_SIZES (WMALL_BLOCK_MAX_BITS - WMALL_BLOCK_MIN_BITS + 1) ///< possible block sizes
49
50#define WMALL_COEFF_PAD_SIZE 16 ///< pad coef buffers with 0 for use with SIMD
51
52/**
53 * @brief frame-specific decoder context for a single channel
54 */
55typedef struct {
56 int16_t prev_block_len; ///< length of the previous block
57 uint8_t transmit_coefs;
58 uint8_t num_subframes;
59 uint16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
60 uint16_t subframe_offsets[MAX_SUBFRAMES]; ///< subframe positions in the current frame
61 uint8_t cur_subframe; ///< current subframe number
62 uint16_t decoded_samples; ///< number of already processed samples
63 int quant_step; ///< quantization step for the current subframe
64 int transient_counter; ///< number of transient samples from the beginning of the transient zone
65} WmallChannelCtx;
66
67/**
68 * @brief main decoder context
69 */
70typedef struct WmallDecodeCtx {
71 /* generic decoder variables */
72 AVCodecContext *avctx;
73 AVFrame *frame;
74 LLAudDSPContext dsp; ///< accelerated DSP functions
75 uint8_t frame_data[MAX_FRAMESIZE + FF_INPUT_BUFFER_PADDING_SIZE]; ///< compressed frame data
76 PutBitContext pb; ///< context for filling the frame_data buffer
77
78 /* frame size dependent frame information (set during initialization) */
79 uint32_t decode_flags; ///< used compression features
80 int len_prefix; ///< frame is prefixed with its length
81 int dynamic_range_compression; ///< frame contains DRC data
82 uint8_t bits_per_sample; ///< integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1.0])
83 uint16_t samples_per_frame; ///< number of samples to output
84 uint16_t log2_frame_size;
85 int8_t num_channels; ///< number of channels in the stream (same as AVCodecContext.num_channels)
86 int8_t lfe_channel; ///< lfe channel index
87 uint8_t max_num_subframes;
88 uint8_t subframe_len_bits; ///< number of bits used for the subframe length
89 uint8_t max_subframe_len_bit; ///< flag indicating that the subframe is of maximum size when the first subframe length bit is 1
90 uint16_t min_samples_per_subframe;
91
92 /* packet decode state */
93 GetBitContext pgb; ///< bitstream reader context for the packet
94 int next_packet_start; ///< start offset of the next WMA packet in the demuxer packet
95 uint8_t packet_offset; ///< offset to the frame in the packet
96 uint8_t packet_sequence_number; ///< current packet number
97 int num_saved_bits; ///< saved number of bits
98 int frame_offset; ///< frame offset in the bit reservoir
99 int subframe_offset; ///< subframe offset in the bit reservoir
100 uint8_t packet_loss; ///< set in case of bitstream error
101 uint8_t packet_done; ///< set when a packet is fully decoded
102
103 /* frame decode state */
104 uint32_t frame_num; ///< current frame number (not used for decoding)
105 GetBitContext gb; ///< bitstream reader context
106 int buf_bit_size; ///< buffer size in bits
107 int16_t *samples_16[WMALL_MAX_CHANNELS]; ///< current samplebuffer pointer (16-bit)
108 int32_t *samples_32[WMALL_MAX_CHANNELS]; ///< current samplebuffer pointer (24-bit)
109 uint8_t drc_gain; ///< gain for the DRC tool
110 int8_t skip_frame; ///< skip output step
111 int8_t parsed_all_subframes; ///< all subframes decoded?
112
113 /* subframe/block decode state */
114 int16_t subframe_len; ///< current subframe length
115 int8_t channels_for_cur_subframe; ///< number of channels that contain the subframe
116 int8_t channel_indexes_for_cur_subframe[WMALL_MAX_CHANNELS];
117
118 WmallChannelCtx channel[WMALL_MAX_CHANNELS]; ///< per channel data
119
120 // WMA Lossless-specific
121
122 uint8_t do_arith_coding;
123 uint8_t do_ac_filter;
124 uint8_t do_inter_ch_decorr;
125 uint8_t do_mclms;
126 uint8_t do_lpc;
127
128 int8_t acfilter_order;
129 int8_t acfilter_scaling;
130 int64_t acfilter_coeffs[16];
131 int acfilter_prevvalues[WMALL_MAX_CHANNELS][16];
132
133 int8_t mclms_order;
134 int8_t mclms_scaling;
135 int16_t mclms_coeffs[WMALL_MAX_CHANNELS * WMALL_MAX_CHANNELS * 32];
136 int16_t mclms_coeffs_cur[WMALL_MAX_CHANNELS * WMALL_MAX_CHANNELS];
137 int16_t mclms_prevvalues[WMALL_MAX_CHANNELS * 2 * 32];
138 int16_t mclms_updates[WMALL_MAX_CHANNELS * 2 * 32];
139 int mclms_recent;
140
141 int movave_scaling;
142 int quant_stepsize;
143
144 struct {
145 int order;
146 int scaling;
147 int coefsend;
148 int bitsend;
149 DECLARE_ALIGNED(16, int16_t, coefs)[MAX_ORDER + WMALL_COEFF_PAD_SIZE/sizeof(int16_t)];
150 DECLARE_ALIGNED(16, int16_t, lms_prevvalues)[MAX_ORDER * 2];
151 DECLARE_ALIGNED(16, int16_t, lms_updates)[MAX_ORDER * 2];
152 int recent;
153 } cdlms[WMALL_MAX_CHANNELS][9];
154
155 int cdlms_ttl[WMALL_MAX_CHANNELS];
156
157 int bV3RTM;
158
159 int is_channel_coded[WMALL_MAX_CHANNELS];
160 int update_speed[WMALL_MAX_CHANNELS];
161
162 int transient[WMALL_MAX_CHANNELS];
163 int transient_pos[WMALL_MAX_CHANNELS];
164 int seekable_tile;
165
166 int ave_sum[WMALL_MAX_CHANNELS];
167
168 int channel_residues[WMALL_MAX_CHANNELS][WMALL_BLOCK_MAX_SIZE];
169
170 int lpc_coefs[WMALL_MAX_CHANNELS][40];
171 int lpc_order;
172 int lpc_scaling;
173 int lpc_intbits;
174
175 int channel_coeffs[WMALL_MAX_CHANNELS][WMALL_BLOCK_MAX_SIZE];
176} WmallDecodeCtx;
177
178
179static av_cold int decode_init(AVCodecContext *avctx)
180{
181 WmallDecodeCtx *s = avctx->priv_data;
182 uint8_t *edata_ptr = avctx->extradata;
183 unsigned int channel_mask;
184 int i, log2_max_num_subframes;
185
186 if (!avctx->block_align) {
187 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
188 return AVERROR(EINVAL);
189 }
190
191 s->avctx = avctx;
192 ff_llauddsp_init(&s->dsp);
193 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
194
195 if (avctx->extradata_size >= 18) {
196 s->decode_flags = AV_RL16(edata_ptr + 14);
197 channel_mask = AV_RL32(edata_ptr + 2);
198 s->bits_per_sample = AV_RL16(edata_ptr);
199 if (s->bits_per_sample == 16)
200 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
201 else if (s->bits_per_sample == 24) {
202 avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
203 avpriv_report_missing_feature(avctx, "Bit-depth higher than 16");
204 return AVERROR_PATCHWELCOME;
205 } else {
206 av_log(avctx, AV_LOG_ERROR, "Unknown bit-depth: %"PRIu8"\n",
207 s->bits_per_sample);
208 return AVERROR_INVALIDDATA;
209 }
210 /* dump the extradata */
211 for (i = 0; i < avctx->extradata_size; i++)
212 av_dlog(avctx, "[%x] ", avctx->extradata[i]);
213 av_dlog(avctx, "\n");
214
215 } else {
216 avpriv_request_sample(avctx, "Unsupported extradata size");
217 return AVERROR_PATCHWELCOME;
218 }
219
220 /* generic init */
221 s->log2_frame_size = av_log2(avctx->block_align) + 4;
222
223 /* frame info */
224 s->skip_frame = 1; /* skip first frame */
225 s->packet_loss = 1;
226 s->len_prefix = s->decode_flags & 0x40;
227
228 /* get frame len */
229 s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
230 3, s->decode_flags);
231 av_assert0(s->samples_per_frame <= WMALL_BLOCK_MAX_SIZE);
232
233 /* init previous block len */
234 for (i = 0; i < avctx->channels; i++)
235 s->channel[i].prev_block_len = s->samples_per_frame;
236
237 /* subframe info */
238 log2_max_num_subframes = (s->decode_flags & 0x38) >> 3;
239 s->max_num_subframes = 1 << log2_max_num_subframes;
240 s->max_subframe_len_bit = 0;
241 s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
242
243 s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
244 s->dynamic_range_compression = s->decode_flags & 0x80;
245 s->bV3RTM = s->decode_flags & 0x100;
246
247 if (s->max_num_subframes > MAX_SUBFRAMES) {
248 av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %"PRIu8"\n",
249 s->max_num_subframes);
250 return AVERROR_INVALIDDATA;
251 }
252
253 s->num_channels = avctx->channels;
254
255 /* extract lfe channel position */
256 s->lfe_channel = -1;
257
258 if (channel_mask & 8) {
259 unsigned int mask;
260 for (mask = 1; mask < 16; mask <<= 1)
261 if (channel_mask & mask)
262 ++s->lfe_channel;
263 }
264
265 if (s->num_channels < 0) {
266 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %"PRId8"\n",
267 s->num_channels);
268 return AVERROR_INVALIDDATA;
269 } else if (s->num_channels > WMALL_MAX_CHANNELS) {
270 avpriv_request_sample(avctx,
271 "More than %d channels", WMALL_MAX_CHANNELS);
272 return AVERROR_PATCHWELCOME;
273 }
274
275 s->frame = av_frame_alloc();
276 if (!s->frame)
277 return AVERROR(ENOMEM);
278
279 avctx->channel_layout = channel_mask;
280 return 0;
281}
282
283/**
284 * @brief Decode the subframe length.
285 * @param s context
286 * @param offset sample offset in the frame
287 * @return decoded subframe length on success, < 0 in case of an error
288 */
289static int decode_subframe_length(WmallDecodeCtx *s, int offset)
290{
291 int frame_len_ratio, subframe_len, len;
292
293 /* no need to read from the bitstream when only one length is possible */
294 if (offset == s->samples_per_frame - s->min_samples_per_subframe)
295 return s->min_samples_per_subframe;
296
297 len = av_log2(s->max_num_subframes - 1) + 1;
298 frame_len_ratio = get_bits(&s->gb, len);
299 subframe_len = s->min_samples_per_subframe * (frame_len_ratio + 1);
300
301 /* sanity check the length */
302 if (subframe_len < s->min_samples_per_subframe ||
303 subframe_len > s->samples_per_frame) {
304 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
305 subframe_len);
306 return AVERROR_INVALIDDATA;
307 }
308 return subframe_len;
309}
310
311/**
312 * @brief Decode how the data in the frame is split into subframes.
313 * Every WMA frame contains the encoded data for a fixed number of
314 * samples per channel. The data for every channel might be split
315 * into several subframes. This function will reconstruct the list of
316 * subframes for every channel.
317 *
318 * If the subframes are not evenly split, the algorithm estimates the
319 * channels with the lowest number of total samples.
320 * Afterwards, for each of these channels a bit is read from the
321 * bitstream that indicates if the channel contains a subframe with the
322 * next subframe size that is going to be read from the bitstream or not.
323 * If a channel contains such a subframe, the subframe size gets added to
324 * the channel's subframe list.
325 * The algorithm repeats these steps until the frame is properly divided
326 * between the individual channels.
327 *
328 * @param s context
329 * @return 0 on success, < 0 in case of an error
330 */
331static int decode_tilehdr(WmallDecodeCtx *s)
332{
333 uint16_t num_samples[WMALL_MAX_CHANNELS] = { 0 }; /* sum of samples for all currently known subframes of a channel */
334 uint8_t contains_subframe[WMALL_MAX_CHANNELS]; /* flag indicating if a channel contains the current subframe */
335 int channels_for_cur_subframe = s->num_channels; /* number of channels that contain the current subframe */
336 int fixed_channel_layout = 0; /* flag indicating that all channels use the same subfra2me offsets and sizes */
337 int min_channel_len = 0; /* smallest sum of samples (channels with this length will be processed first) */
338 int c, tile_aligned;
339
340 /* reset tiling information */
341 for (c = 0; c < s->num_channels; c++)
342 s->channel[c].num_subframes = 0;
343
344 tile_aligned = get_bits1(&s->gb);
345 if (s->max_num_subframes == 1 || tile_aligned)
346 fixed_channel_layout = 1;
347
348 /* loop until the frame data is split between the subframes */
349 do {
350 int subframe_len, in_use = 0;
351
352 /* check which channels contain the subframe */
353 for (c = 0; c < s->num_channels; c++) {
354 if (num_samples[c] == min_channel_len) {
355 if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
356 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe)) {
357 contains_subframe[c] = 1;
358 } else {
359 contains_subframe[c] = get_bits1(&s->gb);
360 }
361 in_use |= contains_subframe[c];
362 } else
363 contains_subframe[c] = 0;
364 }
365
366 if (!in_use) {
367 av_log(s->avctx, AV_LOG_ERROR,
368 "Found empty subframe\n");
369 return AVERROR_INVALIDDATA;
370 }
371
372 /* get subframe length, subframe_len == 0 is not allowed */
373 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
374 return AVERROR_INVALIDDATA;
375 /* add subframes to the individual channels and find new min_channel_len */
376 min_channel_len += subframe_len;
377 for (c = 0; c < s->num_channels; c++) {
378 WmallChannelCtx *chan = &s->channel[c];
379
380 if (contains_subframe[c]) {
381 if (chan->num_subframes >= MAX_SUBFRAMES) {
382 av_log(s->avctx, AV_LOG_ERROR,
383 "broken frame: num subframes > 31\n");
384 return AVERROR_INVALIDDATA;
385 }
386 chan->subframe_len[chan->num_subframes] = subframe_len;
387 num_samples[c] += subframe_len;
388 ++chan->num_subframes;
389 if (num_samples[c] > s->samples_per_frame) {
390 av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
391 "channel len(%"PRIu16") > samples_per_frame(%"PRIu16")\n",
392 num_samples[c], s->samples_per_frame);
393 return AVERROR_INVALIDDATA;
394 }
395 } else if (num_samples[c] <= min_channel_len) {
396 if (num_samples[c] < min_channel_len) {
397 channels_for_cur_subframe = 0;
398 min_channel_len = num_samples[c];
399 }
400 ++channels_for_cur_subframe;
401 }
402 }
403 } while (min_channel_len < s->samples_per_frame);
404
405 for (c = 0; c < s->num_channels; c++) {
406 int i, offset = 0;
407 for (i = 0; i < s->channel[c].num_subframes; i++) {
408 s->channel[c].subframe_offsets[i] = offset;
409 offset += s->channel[c].subframe_len[i];
410 }
411 }
412
413 return 0;
414}
415
416static void decode_ac_filter(WmallDecodeCtx *s)
417{
418 int i;
419 s->acfilter_order = get_bits(&s->gb, 4) + 1;
420 s->acfilter_scaling = get_bits(&s->gb, 4);
421
422 for (i = 0; i < s->acfilter_order; i++)
423 s->acfilter_coeffs[i] = (s->acfilter_scaling ?
424 get_bits(&s->gb, s->acfilter_scaling) : 0) + 1;
425}
426
427static void decode_mclms(WmallDecodeCtx *s)
428{
429 s->mclms_order = (get_bits(&s->gb, 4) + 1) * 2;
430 s->mclms_scaling = get_bits(&s->gb, 4);
431 if (get_bits1(&s->gb)) {
432 int i, send_coef_bits;
433 int cbits = av_log2(s->mclms_scaling + 1);
434 if (1 << cbits < s->mclms_scaling + 1)
435 cbits++;
436
437 send_coef_bits = (cbits ? get_bits(&s->gb, cbits) : 0) + 2;
438
439 for (i = 0; i < s->mclms_order * s->num_channels * s->num_channels; i++)
440 s->mclms_coeffs[i] = get_bits(&s->gb, send_coef_bits);
441
442 for (i = 0; i < s->num_channels; i++) {
443 int c;
444 for (c = 0; c < i; c++)
445 s->mclms_coeffs_cur[i * s->num_channels + c] = get_bits(&s->gb, send_coef_bits);
446 }
447 }
448}
449
450static int decode_cdlms(WmallDecodeCtx *s)
451{
452 int c, i;
453 int cdlms_send_coef = get_bits1(&s->gb);
454
455 for (c = 0; c < s->num_channels; c++) {
456 s->cdlms_ttl[c] = get_bits(&s->gb, 3) + 1;
457 for (i = 0; i < s->cdlms_ttl[c]; i++) {
458 s->cdlms[c][i].order = (get_bits(&s->gb, 7) + 1) * 8;
459 if (s->cdlms[c][i].order > MAX_ORDER) {
460 av_log(s->avctx, AV_LOG_ERROR,
461 "Order[%d][%d] %d > max (%d), not supported\n",
462 c, i, s->cdlms[c][i].order, MAX_ORDER);
463 s->cdlms[0][0].order = 0;
464 return AVERROR_INVALIDDATA;
465 }
466 if(s->cdlms[c][i].order & 8) {
467 static int warned;
468 if(!warned)
469 avpriv_request_sample(s->avctx, "CDLMS of order %d",
470 s->cdlms[c][i].order);
471 warned = 1;
472 }
473 }
474
475 for (i = 0; i < s->cdlms_ttl[c]; i++)
476 s->cdlms[c][i].scaling = get_bits(&s->gb, 4);
477
478 if (cdlms_send_coef) {
479 for (i = 0; i < s->cdlms_ttl[c]; i++) {
480 int cbits, shift_l, shift_r, j;
481 cbits = av_log2(s->cdlms[c][i].order);
482 if ((1 << cbits) < s->cdlms[c][i].order)
483 cbits++;
484 s->cdlms[c][i].coefsend = get_bits(&s->gb, cbits) + 1;
485
486 cbits = av_log2(s->cdlms[c][i].scaling + 1);
487 if ((1 << cbits) < s->cdlms[c][i].scaling + 1)
488 cbits++;
489
490 s->cdlms[c][i].bitsend = get_bits(&s->gb, cbits) + 2;
491 shift_l = 32 - s->cdlms[c][i].bitsend;
492 shift_r = 32 - s->cdlms[c][i].scaling - 2;
493 for (j = 0; j < s->cdlms[c][i].coefsend; j++)
494 s->cdlms[c][i].coefs[j] =
495 (get_bits(&s->gb, s->cdlms[c][i].bitsend) << shift_l) >> shift_r;
496 }
497 }
498
499 for (i = 0; i < s->cdlms_ttl[c]; i++)
500 memset(s->cdlms[c][i].coefs + s->cdlms[c][i].order,
501 0, WMALL_COEFF_PAD_SIZE);
502 }
503
504 return 0;
505}
506
507static int decode_channel_residues(WmallDecodeCtx *s, int ch, int tile_size)
508{
509 int i = 0;
510 unsigned int ave_mean;
511 s->transient[ch] = get_bits1(&s->gb);
512 if (s->transient[ch]) {
513 s->transient_pos[ch] = get_bits(&s->gb, av_log2(tile_size));
514 if (s->transient_pos[ch])
515 s->transient[ch] = 0;
516 s->channel[ch].transient_counter =
517 FFMAX(s->channel[ch].transient_counter, s->samples_per_frame / 2);
518 } else if (s->channel[ch].transient_counter)
519 s->transient[ch] = 1;
520
521 if (s->seekable_tile) {
522 ave_mean = get_bits(&s->gb, s->bits_per_sample);
523 s->ave_sum[ch] = ave_mean << (s->movave_scaling + 1);
524 }
525
526 if (s->seekable_tile) {
527 if (s->do_inter_ch_decorr)
528 s->channel_residues[ch][0] = get_sbits_long(&s->gb, s->bits_per_sample + 1);
529 else
530 s->channel_residues[ch][0] = get_sbits_long(&s->gb, s->bits_per_sample);
531 i++;
532 }
533 for (; i < tile_size; i++) {
534 int quo = 0, rem, rem_bits, residue;
535 while(get_bits1(&s->gb)) {
536 quo++;
537 if (get_bits_left(&s->gb) <= 0)
538 return -1;
539 }
540 if (quo >= 32)
541 quo += get_bits_long(&s->gb, get_bits(&s->gb, 5) + 1);
542
543 ave_mean = (s->ave_sum[ch] + (1 << s->movave_scaling)) >> (s->movave_scaling + 1);
544 if (ave_mean <= 1)
545 residue = quo;
546 else {
547 rem_bits = av_ceil_log2(ave_mean);
548 rem = get_bits_long(&s->gb, rem_bits);
549 residue = (quo << rem_bits) + rem;
550 }
551
552 s->ave_sum[ch] = residue + s->ave_sum[ch] -
553 (s->ave_sum[ch] >> s->movave_scaling);
554
555 if (residue & 1)
556 residue = -(residue >> 1) - 1;
557 else
558 residue = residue >> 1;
559 s->channel_residues[ch][i] = residue;
560 }
561
562 return 0;
563
564}
565
566static void decode_lpc(WmallDecodeCtx *s)
567{
568 int ch, i, cbits;
569 s->lpc_order = get_bits(&s->gb, 5) + 1;
570 s->lpc_scaling = get_bits(&s->gb, 4);
571 s->lpc_intbits = get_bits(&s->gb, 3) + 1;
572 cbits = s->lpc_scaling + s->lpc_intbits;
573 for (ch = 0; ch < s->num_channels; ch++)
574 for (i = 0; i < s->lpc_order; i++)
575 s->lpc_coefs[ch][i] = get_sbits(&s->gb, cbits);
576}
577
578static void clear_codec_buffers(WmallDecodeCtx *s)
579{
580 int ich, ilms;
581
582 memset(s->acfilter_coeffs, 0, sizeof(s->acfilter_coeffs));
583 memset(s->acfilter_prevvalues, 0, sizeof(s->acfilter_prevvalues));
584 memset(s->lpc_coefs, 0, sizeof(s->lpc_coefs));
585
586 memset(s->mclms_coeffs, 0, sizeof(s->mclms_coeffs));
587 memset(s->mclms_coeffs_cur, 0, sizeof(s->mclms_coeffs_cur));
588 memset(s->mclms_prevvalues, 0, sizeof(s->mclms_prevvalues));
589 memset(s->mclms_updates, 0, sizeof(s->mclms_updates));
590
591 for (ich = 0; ich < s->num_channels; ich++) {
592 for (ilms = 0; ilms < s->cdlms_ttl[ich]; ilms++) {
593 memset(s->cdlms[ich][ilms].coefs, 0,
594 sizeof(s->cdlms[ich][ilms].coefs));
595 memset(s->cdlms[ich][ilms].lms_prevvalues, 0,
596 sizeof(s->cdlms[ich][ilms].lms_prevvalues));
597 memset(s->cdlms[ich][ilms].lms_updates, 0,
598 sizeof(s->cdlms[ich][ilms].lms_updates));
599 }
600 s->ave_sum[ich] = 0;
601 }
602}
603
604/**
605 * @brief Reset filter parameters and transient area at new seekable tile.
606 */
607static void reset_codec(WmallDecodeCtx *s)
608{
609 int ich, ilms;
610 s->mclms_recent = s->mclms_order * s->num_channels;
611 for (ich = 0; ich < s->num_channels; ich++) {
612 for (ilms = 0; ilms < s->cdlms_ttl[ich]; ilms++)
613 s->cdlms[ich][ilms].recent = s->cdlms[ich][ilms].order;
614 /* first sample of a seekable subframe is considered as the starting of
615 a transient area which is samples_per_frame samples long */
616 s->channel[ich].transient_counter = s->samples_per_frame;
617 s->transient[ich] = 1;
618 s->transient_pos[ich] = 0;
619 }
620}
621
622static void mclms_update(WmallDecodeCtx *s, int icoef, int *pred)
623{
624 int i, j, ich, pred_error;
625 int order = s->mclms_order;
626 int num_channels = s->num_channels;
627 int range = 1 << (s->bits_per_sample - 1);
628
629 for (ich = 0; ich < num_channels; ich++) {
630 pred_error = s->channel_residues[ich][icoef] - pred[ich];
631 if (pred_error > 0) {
632 for (i = 0; i < order * num_channels; i++)
633 s->mclms_coeffs[i + ich * order * num_channels] +=
634 s->mclms_updates[s->mclms_recent + i];
635 for (j = 0; j < ich; j++) {
636 if (s->channel_residues[j][icoef] > 0)
637 s->mclms_coeffs_cur[ich * num_channels + j] += 1;
638 else if (s->channel_residues[j][icoef] < 0)
639 s->mclms_coeffs_cur[ich * num_channels + j] -= 1;
640 }
641 } else if (pred_error < 0) {
642 for (i = 0; i < order * num_channels; i++)
643 s->mclms_coeffs[i + ich * order * num_channels] -=
644 s->mclms_updates[s->mclms_recent + i];
645 for (j = 0; j < ich; j++) {
646 if (s->channel_residues[j][icoef] > 0)
647 s->mclms_coeffs_cur[ich * num_channels + j] -= 1;
648 else if (s->channel_residues[j][icoef] < 0)
649 s->mclms_coeffs_cur[ich * num_channels + j] += 1;
650 }
651 }
652 }
653
654 for (ich = num_channels - 1; ich >= 0; ich--) {
655 s->mclms_recent--;
656 s->mclms_prevvalues[s->mclms_recent] = s->channel_residues[ich][icoef];
657 if (s->channel_residues[ich][icoef] > range - 1)
658 s->mclms_prevvalues[s->mclms_recent] = range - 1;
659 else if (s->channel_residues[ich][icoef] < -range)
660 s->mclms_prevvalues[s->mclms_recent] = -range;
661
662 s->mclms_updates[s->mclms_recent] = 0;
663 if (s->channel_residues[ich][icoef] > 0)
664 s->mclms_updates[s->mclms_recent] = 1;
665 else if (s->channel_residues[ich][icoef] < 0)
666 s->mclms_updates[s->mclms_recent] = -1;
667 }
668
669 if (s->mclms_recent == 0) {
670 memcpy(&s->mclms_prevvalues[order * num_channels],
671 s->mclms_prevvalues,
672 sizeof(int16_t) * order * num_channels);
673 memcpy(&s->mclms_updates[order * num_channels],
674 s->mclms_updates,
675 sizeof(int16_t) * order * num_channels);
676 s->mclms_recent = num_channels * order;
677 }
678}
679
680static void mclms_predict(WmallDecodeCtx *s, int icoef, int *pred)
681{
682 int ich, i;
683 int order = s->mclms_order;
684 int num_channels = s->num_channels;
685
686 for (ich = 0; ich < num_channels; ich++) {
687 pred[ich] = 0;
688 if (!s->is_channel_coded[ich])
689 continue;
690 for (i = 0; i < order * num_channels; i++)
691 pred[ich] += s->mclms_prevvalues[i + s->mclms_recent] *
692 s->mclms_coeffs[i + order * num_channels * ich];
693 for (i = 0; i < ich; i++)
694 pred[ich] += s->channel_residues[i][icoef] *
695 s->mclms_coeffs_cur[i + num_channels * ich];
696 pred[ich] += 1 << s->mclms_scaling - 1;
697 pred[ich] >>= s->mclms_scaling;
698 s->channel_residues[ich][icoef] += pred[ich];
699 }
700}
701
702static void revert_mclms(WmallDecodeCtx *s, int tile_size)
703{
704 int icoef, pred[WMALL_MAX_CHANNELS] = { 0 };
705 for (icoef = 0; icoef < tile_size; icoef++) {
706 mclms_predict(s, icoef, pred);
707 mclms_update(s, icoef, pred);
708 }
709}
710
711static void lms_update(WmallDecodeCtx *s, int ich, int ilms, int input)
712{
713 int recent = s->cdlms[ich][ilms].recent;
714 int range = 1 << s->bits_per_sample - 1;
715
716 if (recent)
717 recent--;
718 else {
719 memcpy(&s->cdlms[ich][ilms].lms_prevvalues[s->cdlms[ich][ilms].order],
720 s->cdlms[ich][ilms].lms_prevvalues,
721 2 * s->cdlms[ich][ilms].order);
722 memcpy(&s->cdlms[ich][ilms].lms_updates[s->cdlms[ich][ilms].order],
723 s->cdlms[ich][ilms].lms_updates,
724 2 * s->cdlms[ich][ilms].order);
725 recent = s->cdlms[ich][ilms].order - 1;
726 }
727
728 s->cdlms[ich][ilms].lms_prevvalues[recent] = av_clip(input, -range, range - 1);
729 if (!input)
730 s->cdlms[ich][ilms].lms_updates[recent] = 0;
731 else if (input < 0)
732 s->cdlms[ich][ilms].lms_updates[recent] = -s->update_speed[ich];
733 else
734 s->cdlms[ich][ilms].lms_updates[recent] = s->update_speed[ich];
735
736 s->cdlms[ich][ilms].lms_updates[recent + (s->cdlms[ich][ilms].order >> 4)] >>= 2;
737 s->cdlms[ich][ilms].lms_updates[recent + (s->cdlms[ich][ilms].order >> 3)] >>= 1;
738 s->cdlms[ich][ilms].recent = recent;
739}
740
741static void use_high_update_speed(WmallDecodeCtx *s, int ich)
742{
743 int ilms, recent, icoef;
744 for (ilms = s->cdlms_ttl[ich] - 1; ilms >= 0; ilms--) {
745 recent = s->cdlms[ich][ilms].recent;
746 if (s->update_speed[ich] == 16)
747 continue;
748 if (s->bV3RTM) {
749 for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
750 s->cdlms[ich][ilms].lms_updates[icoef + recent] *= 2;
751 } else {
752 for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
753 s->cdlms[ich][ilms].lms_updates[icoef] *= 2;
754 }
755 }
756 s->update_speed[ich] = 16;
757}
758
759static void use_normal_update_speed(WmallDecodeCtx *s, int ich)
760{
761 int ilms, recent, icoef;
762 for (ilms = s->cdlms_ttl[ich] - 1; ilms >= 0; ilms--) {
763 recent = s->cdlms[ich][ilms].recent;
764 if (s->update_speed[ich] == 8)
765 continue;
766 if (s->bV3RTM)
767 for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
768 s->cdlms[ich][ilms].lms_updates[icoef + recent] /= 2;
769 else
770 for (icoef = 0; icoef < s->cdlms[ich][ilms].order; icoef++)
771 s->cdlms[ich][ilms].lms_updates[icoef] /= 2;
772 }
773 s->update_speed[ich] = 8;
774}
775
776/** Get sign of integer (1 for positive, -1 for negative and 0 for zero) */
777#define WMASIGN(x) ((x > 0) - (x < 0))
778
779static void revert_cdlms(WmallDecodeCtx *s, int ch,
780 int coef_begin, int coef_end)
781{
782 int icoef, pred, ilms, num_lms, residue, input;
783
784 num_lms = s->cdlms_ttl[ch];
785 for (ilms = num_lms - 1; ilms >= 0; ilms--) {
786 for (icoef = coef_begin; icoef < coef_end; icoef++) {
787 pred = 1 << (s->cdlms[ch][ilms].scaling - 1);
788 residue = s->channel_residues[ch][icoef];
789 pred += s->dsp.scalarproduct_and_madd_int16(s->cdlms[ch][ilms].coefs,
790 s->cdlms[ch][ilms].lms_prevvalues
791 + s->cdlms[ch][ilms].recent,
792 s->cdlms[ch][ilms].lms_updates
793 + s->cdlms[ch][ilms].recent,
794 s->cdlms[ch][ilms].order,
795 WMASIGN(residue));
796 input = residue + (pred >> s->cdlms[ch][ilms].scaling);
797 lms_update(s, ch, ilms, input);
798 s->channel_residues[ch][icoef] = input;
799 }
800 }
801 emms_c();
802}
803
804static void revert_inter_ch_decorr(WmallDecodeCtx *s, int tile_size)
805{
806 if (s->num_channels != 2)
807 return;
808 else if (s->is_channel_coded[0] || s->is_channel_coded[1]) {
809 int icoef;
810 for (icoef = 0; icoef < tile_size; icoef++) {
811 s->channel_residues[0][icoef] -= s->channel_residues[1][icoef] >> 1;
812 s->channel_residues[1][icoef] += s->channel_residues[0][icoef];
813 }
814 }
815}
816
817static void revert_acfilter(WmallDecodeCtx *s, int tile_size)
818{
819 int ich, pred, i, j;
820 int64_t *filter_coeffs = s->acfilter_coeffs;
821 int scaling = s->acfilter_scaling;
822 int order = s->acfilter_order;
823
824 for (ich = 0; ich < s->num_channels; ich++) {
825 int *prevvalues = s->acfilter_prevvalues[ich];
826 for (i = 0; i < order; i++) {
827 pred = 0;
828 for (j = 0; j < order; j++) {
829 if (i <= j)
830 pred += filter_coeffs[j] * prevvalues[j - i];
831 else
832 pred += s->channel_residues[ich][i - j - 1] * filter_coeffs[j];
833 }
834 pred >>= scaling;
835 s->channel_residues[ich][i] += pred;
836 }
837 for (i = order; i < tile_size; i++) {
838 pred = 0;
839 for (j = 0; j < order; j++)
840 pred += s->channel_residues[ich][i - j - 1] * filter_coeffs[j];
841 pred >>= scaling;
842 s->channel_residues[ich][i] += pred;
843 }
844 for (j = 0; j < order; j++)
845 prevvalues[j] = s->channel_residues[ich][tile_size - j - 1];
846 }
847}
848
849static int decode_subframe(WmallDecodeCtx *s)
850{
851 int offset = s->samples_per_frame;
852 int subframe_len = s->samples_per_frame;
853 int total_samples = s->samples_per_frame * s->num_channels;
854 int i, j, rawpcm_tile, padding_zeroes, res;
855
856 s->subframe_offset = get_bits_count(&s->gb);
857
858 /* reset channel context and find the next block offset and size
859 == the next block of the channel with the smallest number of
860 decoded samples */
861 for (i = 0; i < s->num_channels; i++) {
862 if (offset > s->channel[i].decoded_samples) {
863 offset = s->channel[i].decoded_samples;
864 subframe_len =
865 s->channel[i].subframe_len[s->channel[i].cur_subframe];
866 }
867 }
868
869 /* get a list of all channels that contain the estimated block */
870 s->channels_for_cur_subframe = 0;
871 for (i = 0; i < s->num_channels; i++) {
872 const int cur_subframe = s->channel[i].cur_subframe;
873 /* subtract already processed samples */
874 total_samples -= s->channel[i].decoded_samples;
875
876 /* and count if there are multiple subframes that match our profile */
877 if (offset == s->channel[i].decoded_samples &&
878 subframe_len == s->channel[i].subframe_len[cur_subframe]) {
879 total_samples -= s->channel[i].subframe_len[cur_subframe];
880 s->channel[i].decoded_samples +=
881 s->channel[i].subframe_len[cur_subframe];
882 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
883 ++s->channels_for_cur_subframe;
884 }
885 }
886
887 /* check if the frame will be complete after processing the
888 estimated block */
889 if (!total_samples)
890 s->parsed_all_subframes = 1;
891
892
893 s->seekable_tile = get_bits1(&s->gb);
894 if (s->seekable_tile) {
895 clear_codec_buffers(s);
896
897 s->do_arith_coding = get_bits1(&s->gb);
898 if (s->do_arith_coding) {
899 avpriv_request_sample(s->avctx, "Arithmetic coding");
900 return AVERROR_PATCHWELCOME;
901 }
902 s->do_ac_filter = get_bits1(&s->gb);
903 s->do_inter_ch_decorr = get_bits1(&s->gb);
904 s->do_mclms = get_bits1(&s->gb);
905
906 if (s->do_ac_filter)
907 decode_ac_filter(s);
908
909 if (s->do_mclms)
910 decode_mclms(s);
911
912 if ((res = decode_cdlms(s)) < 0)
913 return res;
914 s->movave_scaling = get_bits(&s->gb, 3);
915 s->quant_stepsize = get_bits(&s->gb, 8) + 1;
916
917 reset_codec(s);
918 } else if (!s->cdlms[0][0].order) {
919 av_log(s->avctx, AV_LOG_DEBUG,
920 "Waiting for seekable tile\n");
921 av_frame_unref(s->frame);
922 return -1;
923 }
924
925 rawpcm_tile = get_bits1(&s->gb);
926
927 for (i = 0; i < s->num_channels; i++)
928 s->is_channel_coded[i] = 1;
929
930 if (!rawpcm_tile) {
931 for (i = 0; i < s->num_channels; i++)
932 s->is_channel_coded[i] = get_bits1(&s->gb);
933
934 if (s->bV3RTM) {
935 // LPC
936 s->do_lpc = get_bits1(&s->gb);
937 if (s->do_lpc) {
938 decode_lpc(s);
939 avpriv_request_sample(s->avctx, "Expect wrong output since "
940 "inverse LPC filter");
941 }
942 } else
943 s->do_lpc = 0;
944 }
945
946
947 if (get_bits1(&s->gb))
948 padding_zeroes = get_bits(&s->gb, 5);
949 else
950 padding_zeroes = 0;
951
952 if (rawpcm_tile) {
953 int bits = s->bits_per_sample - padding_zeroes;
954 if (bits <= 0) {
955 av_log(s->avctx, AV_LOG_ERROR,
956 "Invalid number of padding bits in raw PCM tile\n");
957 return AVERROR_INVALIDDATA;
958 }
959 av_dlog(s->avctx, "RAWPCM %d bits per sample. "
960 "total %d bits, remain=%d\n", bits,
961 bits * s->num_channels * subframe_len, get_bits_count(&s->gb));
962 for (i = 0; i < s->num_channels; i++)
963 for (j = 0; j < subframe_len; j++)
964 s->channel_coeffs[i][j] = get_sbits_long(&s->gb, bits);
965 } else {
966 for (i = 0; i < s->num_channels; i++)
967 if (s->is_channel_coded[i]) {
968 decode_channel_residues(s, i, subframe_len);
969 if (s->seekable_tile)
970 use_high_update_speed(s, i);
971 else
972 use_normal_update_speed(s, i);
973 revert_cdlms(s, i, 0, subframe_len);
974 } else {
975 memset(s->channel_residues[i], 0, sizeof(**s->channel_residues) * subframe_len);
976 }
977 }
978 if (s->do_mclms)
979 revert_mclms(s, subframe_len);
980 if (s->do_inter_ch_decorr)
981 revert_inter_ch_decorr(s, subframe_len);
982 if (s->do_ac_filter)
983 revert_acfilter(s, subframe_len);
984
985 /* Dequantize */
986 if (s->quant_stepsize != 1)
987 for (i = 0; i < s->num_channels; i++)
988 for (j = 0; j < subframe_len; j++)
989 s->channel_residues[i][j] *= s->quant_stepsize;
990
991 /* Write to proper output buffer depending on bit-depth */
992 for (i = 0; i < s->channels_for_cur_subframe; i++) {
993 int c = s->channel_indexes_for_cur_subframe[i];
994 int subframe_len = s->channel[c].subframe_len[s->channel[c].cur_subframe];
995
996 for (j = 0; j < subframe_len; j++) {
997 if (s->bits_per_sample == 16) {
998 *s->samples_16[c]++ = (int16_t) s->channel_residues[c][j] << padding_zeroes;
999 } else {
1000 *s->samples_32[c]++ = s->channel_residues[c][j] << padding_zeroes;
1001 }
1002 }
1003 }
1004
1005 /* handled one subframe */
1006 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1007 int c = s->channel_indexes_for_cur_subframe[i];
1008 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
1009 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
1010 return AVERROR_INVALIDDATA;
1011 }
1012 ++s->channel[c].cur_subframe;
1013 }
1014 return 0;
1015}
1016
1017/**
1018 * @brief Decode one WMA frame.
1019 * @param s codec context
1020 * @return 0 if the trailer bit indicates that this is the last frame,
1021 * 1 if there are additional frames
1022 */
1023static int decode_frame(WmallDecodeCtx *s)
1024{
1025 GetBitContext* gb = &s->gb;
1026 int more_frames = 0, len = 0, i, ret;
1027
1028 s->frame->nb_samples = s->samples_per_frame;
1029 if ((ret = ff_get_buffer(s->avctx, s->frame, 0)) < 0) {
1030 /* return an error if no frame could be decoded at all */
1031 s->packet_loss = 1;
1032 return ret;
1033 }
1034 for (i = 0; i < s->num_channels; i++) {
1035 s->samples_16[i] = (int16_t *)s->frame->extended_data[i];
1036 s->samples_32[i] = (int32_t *)s->frame->extended_data[i];
1037 }
1038
1039 /* get frame length */
1040 if (s->len_prefix)
1041 len = get_bits(gb, s->log2_frame_size);
1042
1043 /* decode tile information */
1044 if ((ret = decode_tilehdr(s))) {
1045 s->packet_loss = 1;
1046 av_frame_unref(s->frame);
1047 return ret;
1048 }
1049
1050 /* read drc info */
1051 if (s->dynamic_range_compression)
1052 s->drc_gain = get_bits(gb, 8);
1053
1054 /* no idea what these are for, might be the number of samples
1055 that need to be skipped at the beginning or end of a stream */
1056 if (get_bits1(gb)) {
1057 int av_unused skip;
1058
1059 /* usually true for the first frame */
1060 if (get_bits1(gb)) {
1061 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1062 av_dlog(s->avctx, "start skip: %i\n", skip);
1063 }
1064
1065 /* sometimes true for the last frame */
1066 if (get_bits1(gb)) {
1067 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1068 av_dlog(s->avctx, "end skip: %i\n", skip);
1069 }
1070
1071 }
1072
1073 /* reset subframe states */
1074 s->parsed_all_subframes = 0;
1075 for (i = 0; i < s->num_channels; i++) {
1076 s->channel[i].decoded_samples = 0;
1077 s->channel[i].cur_subframe = 0;
1078 }
1079
1080 /* decode all subframes */
1081 while (!s->parsed_all_subframes) {
1082 int decoded_samples = s->channel[0].decoded_samples;
1083 if (decode_subframe(s) < 0) {
1084 s->packet_loss = 1;
1085 if (s->frame->nb_samples)
1086 s->frame->nb_samples = decoded_samples;
1087 return 0;
1088 }
1089 }
1090
1091 av_dlog(s->avctx, "Frame done\n");
1092
1093 if (s->skip_frame)
1094 s->skip_frame = 0;
1095
1096 if (s->len_prefix) {
1097 if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
1098 /* FIXME: not sure if this is always an error */
1099 av_log(s->avctx, AV_LOG_ERROR,
1100 "frame[%"PRIu32"] would have to skip %i bits\n",
1101 s->frame_num,
1102 len - (get_bits_count(gb) - s->frame_offset) - 1);
1103 s->packet_loss = 1;
1104 return 0;
1105 }
1106
1107 /* skip the rest of the frame data */
1108 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
1109 }
1110
1111 /* decode trailer bit */
1112 more_frames = get_bits1(gb);
1113 ++s->frame_num;
1114 return more_frames;
1115}
1116
1117/**
1118 * @brief Calculate remaining input buffer length.
1119 * @param s codec context
1120 * @param gb bitstream reader context
1121 * @return remaining size in bits
1122 */
1123static int remaining_bits(WmallDecodeCtx *s, GetBitContext *gb)
1124{
1125 return s->buf_bit_size - get_bits_count(gb);
1126}
1127
1128/**
1129 * @brief Fill the bit reservoir with a (partial) frame.
1130 * @param s codec context
1131 * @param gb bitstream reader context
1132 * @param len length of the partial frame
1133 * @param append decides whether to reset the buffer or not
1134 */
1135static void save_bits(WmallDecodeCtx *s, GetBitContext* gb, int len,
1136 int append)
1137{
1138 int buflen;
1139 PutBitContext tmp;
1140
1141 /* when the frame data does not need to be concatenated, the input buffer
1142 is reset and additional bits from the previous frame are copied
1143 and skipped later so that a fast byte copy is possible */
1144
1145 if (!append) {
1146 s->frame_offset = get_bits_count(gb) & 7;
1147 s->num_saved_bits = s->frame_offset;
1148 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
1149 }
1150
1151 buflen = (s->num_saved_bits + len + 8) >> 3;
1152
1153 if (len <= 0 || buflen > MAX_FRAMESIZE) {
1154 avpriv_request_sample(s->avctx, "Too small input buffer");
1155 s->packet_loss = 1;
1156 return;
1157 }
1158
1159 s->num_saved_bits += len;
1160 if (!append) {
1161 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
1162 s->num_saved_bits);
1163 } else {
1164 int align = 8 - (get_bits_count(gb) & 7);
1165 align = FFMIN(align, len);
1166 put_bits(&s->pb, align, get_bits(gb, align));
1167 len -= align;
1168 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
1169 }
1170 skip_bits_long(gb, len);
1171
1172 tmp = s->pb;
1173 flush_put_bits(&tmp);
1174
1175 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
1176 skip_bits(&s->gb, s->frame_offset);
1177}
1178
1179static int decode_packet(AVCodecContext *avctx, void *data, int *got_frame_ptr,
1180 AVPacket* avpkt)
1181{
1182 WmallDecodeCtx *s = avctx->priv_data;
1183 GetBitContext* gb = &s->pgb;
1184 const uint8_t* buf = avpkt->data;
1185 int buf_size = avpkt->size;
1186 int num_bits_prev_frame, packet_sequence_number, spliced_packet;
1187
1188 s->frame->nb_samples = 0;
1189
1190 if (s->packet_done || s->packet_loss) {
1191 s->packet_done = 0;
1192
1193 if (!buf_size)
1194 return 0;
1195 /* sanity check for the buffer length */
1196 if (buf_size < avctx->block_align) {
1197 av_log(avctx, AV_LOG_ERROR, "buf size %d invalid\n", buf_size);
1198 return AVERROR_INVALIDDATA;
1199 }
1200
1201 s->next_packet_start = buf_size - avctx->block_align;
1202 buf_size = avctx->block_align;
1203 s->buf_bit_size = buf_size << 3;
1204
1205 /* parse packet header */
1206 init_get_bits(gb, buf, s->buf_bit_size);
1207 packet_sequence_number = get_bits(gb, 4);
1208 skip_bits(gb, 1); // Skip seekable_frame_in_packet, currently ununused
1209 spliced_packet = get_bits1(gb);
1210 if (spliced_packet)
1211 avpriv_request_sample(avctx, "Bitstream splicing");
1212
1213 /* get number of bits that need to be added to the previous frame */
1214 num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
1215
1216 /* check for packet loss */
1217 if (!s->packet_loss &&
1218 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
1219 s->packet_loss = 1;
1220 av_log(avctx, AV_LOG_ERROR,
1221 "Packet loss detected! seq %"PRIx8" vs %x\n",
1222 s->packet_sequence_number, packet_sequence_number);
1223 }
1224 s->packet_sequence_number = packet_sequence_number;
1225
1226 if (num_bits_prev_frame > 0) {
1227 int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
1228 if (num_bits_prev_frame >= remaining_packet_bits) {
1229 num_bits_prev_frame = remaining_packet_bits;
1230 s->packet_done = 1;
1231 }
1232
1233 /* Append the previous frame data to the remaining data from the
1234 * previous packet to create a full frame. */
1235 save_bits(s, gb, num_bits_prev_frame, 1);
1236
1237 /* decode the cross packet frame if it is valid */
1238 if (num_bits_prev_frame < remaining_packet_bits && !s->packet_loss)
1239 decode_frame(s);
1240 } else if (s->num_saved_bits - s->frame_offset) {
1241 av_dlog(avctx, "ignoring %x previously saved bits\n",
1242 s->num_saved_bits - s->frame_offset);
1243 }
1244
1245 if (s->packet_loss) {
1246 /* Reset number of saved bits so that the decoder does not start
1247 * to decode incomplete frames in the s->len_prefix == 0 case. */
1248 s->num_saved_bits = 0;
1249 s->packet_loss = 0;
1250 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
1251 }
1252
1253 } else {
1254 int frame_size;
1255
1256 s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
1257 init_get_bits(gb, avpkt->data, s->buf_bit_size);
1258 skip_bits(gb, s->packet_offset);
1259
1260 if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
1261 (frame_size = show_bits(gb, s->log2_frame_size)) &&
1262 frame_size <= remaining_bits(s, gb)) {
1263 save_bits(s, gb, frame_size, 0);
1264 s->packet_done = !decode_frame(s);
1265 } else if (!s->len_prefix
1266 && s->num_saved_bits > get_bits_count(&s->gb)) {
1267 /* when the frames do not have a length prefix, we don't know the
1268 * compressed length of the individual frames however, we know what
1269 * part of a new packet belongs to the previous frame therefore we
1270 * save the incoming packet first, then we append the "previous
1271 * frame" data from the next packet so that we get a buffer that
1272 * only contains full frames */
1273 s->packet_done = !decode_frame(s);
1274 } else {
1275 s->packet_done = 1;
1276 }
1277 }
1278
1279 if (s->packet_done && !s->packet_loss &&
1280 remaining_bits(s, gb) > 0) {
1281 /* save the rest of the data so that it can be decoded
1282 * with the next packet */
1283 save_bits(s, gb, remaining_bits(s, gb), 0);
1284 }
1285
1286 *got_frame_ptr = s->frame->nb_samples > 0;
1287 av_frame_move_ref(data, s->frame);
1288
1289 s->packet_offset = get_bits_count(gb) & 7;
1290
1291 return (s->packet_loss) ? AVERROR_INVALIDDATA : get_bits_count(gb) >> 3;
1292}
1293
1294static void flush(AVCodecContext *avctx)
1295{
1296 WmallDecodeCtx *s = avctx->priv_data;
1297 s->packet_loss = 1;
1298 s->packet_done = 0;
1299 s->num_saved_bits = 0;
1300 s->frame_offset = 0;
1301 s->next_packet_start = 0;
1302 s->cdlms[0][0].order = 0;
1303 s->frame->nb_samples = 0;
1304 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
1305}
1306
1307static av_cold int decode_close(AVCodecContext *avctx)
1308{
1309 WmallDecodeCtx *s = avctx->priv_data;
1310
1311 av_frame_free(&s->frame);
1312
1313 return 0;
1314}
1315
1316AVCodec ff_wmalossless_decoder = {
1317 .name = "wmalossless",
1318 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio Lossless"),
1319 .type = AVMEDIA_TYPE_AUDIO,
1320 .id = AV_CODEC_ID_WMALOSSLESS,
1321 .priv_data_size = sizeof(WmallDecodeCtx),
1322 .init = decode_init,
1323 .close = decode_close,
1324 .decode = decode_packet,
1325 .flush = flush,
1326 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1 | CODEC_CAP_DELAY,
1327 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
1328 AV_SAMPLE_FMT_S32P,
1329 AV_SAMPLE_FMT_NONE },
1330};
ffmpeg Piment Noir Debian package repository