path: root/libavcodec/wmaprodec.c (plain)
blob: 5c99628c52d28e868106ac849b3926bbab050ee8

1	/*
2	* Wmapro compatible decoder
3	* Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
4	* Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson
5	*
6	* This file is part of FFmpeg.
7	*
8	* FFmpeg is free software; you can redistribute it and/or
9	* modify it under the terms of the GNU Lesser General Public
10	* License as published by the Free Software Foundation; either
11	* version 2.1 of the License, or (at your option) any later version.
12	*
13	* FFmpeg is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16	* Lesser General Public License for more details.
17	*
18	* You should have received a copy of the GNU Lesser General Public
19	* License along with FFmpeg; if not, write to the Free Software
20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21	*/
22
23	/**
24	* @file
25	* @brief wmapro decoder implementation
26	* Wmapro is an MDCT based codec comparable to wma standard or AAC.
27	* The decoding therefore consists of the following steps:
28	* - bitstream decoding
29	* - reconstruction of per-channel data
30	* - rescaling and inverse quantization
31	* - IMDCT
32	* - windowing and overlapp-add
33	*
34	* The compressed wmapro bitstream is split into individual packets.
35	* Every such packet contains one or more wma frames.
36	* The compressed frames may have a variable length and frames may
37	* cross packet boundaries.
38	* Common to all wmapro frames is the number of samples that are stored in
39	* a frame.
40	* The number of samples and a few other decode flags are stored
41	* as extradata that has to be passed to the decoder.
42	*
43	* The wmapro frames themselves are again split into a variable number of
44	* subframes. Every subframe contains the data for 2^N time domain samples
45	* where N varies between 7 and 12.
46	*
47	* Example wmapro bitstream (in samples):
48	*
49	* || packet 0 || packet 1 || packet 2 packets
50	* ---------------------------------------------------
51	* || frame 0 || frame 1 || frame 2 || frames
52	* ---------------------------------------------------
53	* || | | || | | | || || subframes of channel 0
54	* ---------------------------------------------------
55	* || | | || | | | || || subframes of channel 1
56	* ---------------------------------------------------
57	*
58	* The frame layouts for the individual channels of a wma frame does not need
59	* to be the same.
60	*
61	* However, if the offsets and lengths of several subframes of a frame are the
62	* same, the subframes of the channels can be grouped.
63	* Every group may then use special coding techniques like M/S stereo coding
64	* to improve the compression ratio. These channel transformations do not
65	* need to be applied to a whole subframe. Instead, they can also work on
66	* individual scale factor bands (see below).
67	* The coefficients that carry the audio signal in the frequency domain
68	* are transmitted as huffman-coded vectors with 4, 2 and 1 elements.
69	* In addition to that, the encoder can switch to a runlevel coding scheme
70	* by transmitting subframe_length / 128 zero coefficients.
71	*
72	* Before the audio signal can be converted to the time domain, the
73	* coefficients have to be rescaled and inverse quantized.
74	* A subframe is therefore split into several scale factor bands that get
75	* scaled individually.
76	* Scale factors are submitted for every frame but they might be shared
77	* between the subframes of a channel. Scale factors are initially DPCM-coded.
78	* Once scale factors are shared, the differences are transmitted as runlevel
79	* codes.
80	* Every subframe length and offset combination in the frame layout shares a
81	* common quantization factor that can be adjusted for every channel by a
82	* modifier.
83	* After the inverse quantization, the coefficients get processed by an IMDCT.
84	* The resulting values are then windowed with a sine window and the first half
85	* of the values are added to the second half of the output from the previous
86	* subframe in order to reconstruct the output samples.
87	*/
88
89	#include <inttypes.h>
90
91	#include "libavutil/ffmath.h"
92	#include "libavutil/float_dsp.h"
93	#include "libavutil/intfloat.h"
94	#include "libavutil/intreadwrite.h"
95	#include "avcodec.h"
96	#include "internal.h"
97	#include "get_bits.h"
98	#include "put_bits.h"
99	#include "wmaprodata.h"
100	#include "sinewin.h"
101	#include "wma.h"
102	#include "wma_common.h"
103
104	/** current decoder limitations */
105	#define WMAPRO_MAX_CHANNELS 8 ///< max number of handled channels
106	#define MAX_SUBFRAMES 32 ///< max number of subframes per channel
107	#define MAX_BANDS 29 ///< max number of scale factor bands
108	#define MAX_FRAMESIZE 32768 ///< maximum compressed frame size
109
110	#define WMAPRO_BLOCK_MIN_BITS 6 ///< log2 of min block size
111	#define WMAPRO_BLOCK_MAX_BITS 13 ///< log2 of max block size
112	#define WMAPRO_BLOCK_MIN_SIZE (1 << WMAPRO_BLOCK_MIN_BITS) ///< minimum block size
113	#define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size
114	#define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes
115
116
117	#define VLCBITS 9
118	#define SCALEVLCBITS 8
119	#define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS)
120	#define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS)
121	#define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS)
122	#define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS)
123	#define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS)
124
125	static VLC sf_vlc; ///< scale factor DPCM vlc
126	static VLC sf_rl_vlc; ///< scale factor run length vlc
127	static VLC vec4_vlc; ///< 4 coefficients per symbol
128	static VLC vec2_vlc; ///< 2 coefficients per symbol
129	static VLC vec1_vlc; ///< 1 coefficient per symbol
130	static VLC coef_vlc[2]; ///< coefficient run length vlc codes
131	static float sin64[33]; ///< sine table for decorrelation
132
133	/**
134	* @brief frame specific decoder context for a single channel
135	*/
136	typedef struct WMAProChannelCtx {
137	int16_t prev_block_len; ///< length of the previous block
138	uint8_t transmit_coefs;
139	uint8_t num_subframes;
140	uint16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
141	uint16_t subframe_offset[MAX_SUBFRAMES]; ///< subframe positions in the current frame
142	uint8_t cur_subframe; ///< current subframe number
143	uint16_t decoded_samples; ///< number of already processed samples
144	uint8_t grouped; ///< channel is part of a group
145	int quant_step; ///< quantization step for the current subframe
146	int8_t reuse_sf; ///< share scale factors between subframes
147	int8_t scale_factor_step; ///< scaling step for the current subframe
148	int max_scale_factor; ///< maximum scale factor for the current subframe
149	int saved_scale_factors[2][MAX_BANDS]; ///< resampled and (previously) transmitted scale factor values
150	int8_t scale_factor_idx; ///< index for the transmitted scale factor values (used for resampling)
151	int* scale_factors; ///< pointer to the scale factor values used for decoding
152	uint8_t table_idx; ///< index in sf_offsets for the scale factor reference block
153	float* coeffs; ///< pointer to the subframe decode buffer
154	uint16_t num_vec_coeffs; ///< number of vector coded coefficients
155	DECLARE_ALIGNED(32, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2]; ///< output buffer
156	} WMAProChannelCtx;
157
158	/**
159	* @brief channel group for channel transformations
160	*/
161	typedef struct WMAProChannelGrp {
162	uint8_t num_channels; ///< number of channels in the group
163	int8_t transform; ///< transform on / off
164	int8_t transform_band[MAX_BANDS]; ///< controls if the transform is enabled for a certain band
165	float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS];
166	float* channel_data[WMAPRO_MAX_CHANNELS]; ///< transformation coefficients
167	} WMAProChannelGrp;
168
169	/**
170	* @brief main decoder context
171	*/
172	typedef struct WMAProDecodeCtx {
173	/* generic decoder variables */
174	AVCodecContext* avctx; ///< codec context for av_log
175	AVFloatDSPContext *fdsp;
176	uint8_t frame_data[MAX_FRAMESIZE +
177	AV_INPUT_BUFFER_PADDING_SIZE];///< compressed frame data
178	PutBitContext pb; ///< context for filling the frame_data buffer
179	FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES]; ///< MDCT context per block size
180	DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE]; ///< IMDCT output buffer
181	const float* windows[WMAPRO_BLOCK_SIZES]; ///< windows for the different block sizes
182
183	/* frame size dependent frame information (set during initialization) */
184	uint32_t decode_flags; ///< used compression features
185	uint8_t len_prefix; ///< frame is prefixed with its length
186	uint8_t dynamic_range_compression; ///< frame contains DRC data
187	uint8_t bits_per_sample; ///< integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1.0])
188	uint16_t samples_per_frame; ///< number of samples to output
189	uint16_t log2_frame_size;
190	int8_t lfe_channel; ///< lfe channel index
191	uint8_t max_num_subframes;
192	uint8_t subframe_len_bits; ///< number of bits used for the subframe length
193	uint8_t max_subframe_len_bit; ///< flag indicating that the subframe is of maximum size when the first subframe length bit is 1
194	uint16_t min_samples_per_subframe;
195	int8_t num_sfb[WMAPRO_BLOCK_SIZES]; ///< scale factor bands per block size
196	int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor band offsets (multiples of 4)
197	int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor resample matrix
198	int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; ///< subwoofer cutoff values
199
200	/* packet decode state */
201	GetBitContext pgb; ///< bitstream reader context for the packet
202	int next_packet_start; ///< start offset of the next wma packet in the demuxer packet
203	uint8_t packet_offset; ///< frame offset in the packet
204	uint8_t packet_sequence_number; ///< current packet number
205	int num_saved_bits; ///< saved number of bits
206	int frame_offset; ///< frame offset in the bit reservoir
207	int subframe_offset; ///< subframe offset in the bit reservoir
208	uint8_t packet_loss; ///< set in case of bitstream error
209	uint8_t packet_done; ///< set when a packet is fully decoded
210
211	/* frame decode state */
212	uint32_t frame_num; ///< current frame number (not used for decoding)
213	GetBitContext gb; ///< bitstream reader context
214	int buf_bit_size; ///< buffer size in bits
215	uint8_t drc_gain; ///< gain for the DRC tool
216	int8_t skip_frame; ///< skip output step
217	int8_t parsed_all_subframes; ///< all subframes decoded?
218	uint8_t skip_packets;
219
220	/* subframe/block decode state */
221	int16_t subframe_len; ///< current subframe length
222	int8_t nb_channels; ///< number of channels in stream (XMA1/2)
223	int8_t channels_for_cur_subframe; ///< number of channels that contain the subframe
224	int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS];
225	int8_t num_bands; ///< number of scale factor bands
226	int8_t transmit_num_vec_coeffs; ///< number of vector coded coefficients is part of the bitstream
227	int16_t* cur_sfb_offsets; ///< sfb offsets for the current block
228	uint8_t table_idx; ///< index for the num_sfb, sfb_offsets, sf_offsets and subwoofer_cutoffs tables
229	int8_t esc_len; ///< length of escaped coefficients
230
231	uint8_t num_chgroups; ///< number of channel groups
232	WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS]; ///< channel group information
233
234	WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS]; ///< per channel data
235	} WMAProDecodeCtx;
236
237	typedef struct XMADecodeCtx {
238	WMAProDecodeCtx xma[4];
239	AVFrame *frames[4];
240	int current_stream;
241	float samples[8][512 * 64];
242	int offset[4];
243	} XMADecodeCtx;
244
245	/**
246	*@brief helper function to print the most important members of the context
247	*@param s context
248	*/
249	static av_cold void dump_context(WMAProDecodeCtx *s)
250	{
251	#define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
252	#define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %"PRIx32"\n", a, b);
253
254	PRINT("ed sample bit depth", s->bits_per_sample);
255	PRINT_HEX("ed decode flags", s->decode_flags);
256	PRINT("samples per frame", s->samples_per_frame);
257	PRINT("log2 frame size", s->log2_frame_size);
258	PRINT("max num subframes", s->max_num_subframes);
259	PRINT("len prefix", s->len_prefix);
260	PRINT("num channels", s->nb_channels);
261	}
262
263	/**
264	*@brief Uninitialize the decoder and free all resources.
265	*@param avctx codec context
266	*@return 0 on success, < 0 otherwise
267	*/
268	static av_cold int decode_end(WMAProDecodeCtx *s)
269	{
270	int i;
271
272	av_freep(&s->fdsp);
273
274	for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
275	ff_mdct_end(&s->mdct_ctx[i]);
276
277	return 0;
278	}
279
280	static av_cold int wmapro_decode_end(AVCodecContext *avctx)
281	{
282	WMAProDecodeCtx *s = avctx->priv_data;
283
284	decode_end(s);
285
286	return 0;
287	}
288
289	static av_cold int get_rate(AVCodecContext *avctx)
290	{
291	if (avctx->codec_id != AV_CODEC_ID_WMAPRO) { // XXX: is this really only for XMA?
292	if (avctx->sample_rate > 44100)
293	return 48000;
294	else if (avctx->sample_rate > 32000)
295	return 44100;
296	else if (avctx->sample_rate > 24000)
297	return 32000;
298	return 24000;
299	}
300
301	return avctx->sample_rate;
302	}
303
304	/**
305	*@brief Initialize the decoder.
306	*@param avctx codec context
307	*@return 0 on success, -1 otherwise
308	*/
309	static av_cold int decode_init(WMAProDecodeCtx *s, AVCodecContext *avctx)
310	{
311	uint8_t *edata_ptr = avctx->extradata;
312	unsigned int channel_mask;
313	int i, bits;
314	int log2_max_num_subframes;
315	int num_possible_block_sizes;
316
317	if (avctx->codec_id == AV_CODEC_ID_XMA1 || avctx->codec_id == AV_CODEC_ID_XMA2)
318	avctx->block_align = 2048;
319
320	if (!avctx->block_align) {
321	av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
322	return AVERROR(EINVAL);
323	}
324
325	s->avctx = avctx;
326
327	init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
328
329	avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
330
331	/** dump the extradata */
332	av_log(avctx, AV_LOG_DEBUG, "extradata:\n");
333	for (i = 0; i < avctx->extradata_size; i++)
334	av_log(avctx, AV_LOG_DEBUG, "[%x] ", avctx->extradata[i]);
335	av_log(avctx, AV_LOG_DEBUG, "\n");
336	if (avctx->codec_id == AV_CODEC_ID_XMA2 && (!avctx->extradata || avctx->extradata_size >= 6)) {
337	s->decode_flags = 0x10d6;
338	channel_mask = avctx->extradata ? AV_RL32(edata_ptr+2) : 0;
339	s->bits_per_sample = 16;
340	} else if (avctx->codec_id == AV_CODEC_ID_XMA1) {
341	s->decode_flags = 0x10d6;
342	s->bits_per_sample = 16;
343	channel_mask = 0;
344	} else if (avctx->codec_id == AV_CODEC_ID_WMAPRO && avctx->extradata_size >= 18) {
345	s->decode_flags = AV_RL16(edata_ptr+14);
346	channel_mask = AV_RL32(edata_ptr+2);
347	s->bits_per_sample = AV_RL16(edata_ptr);
348
349	if (s->bits_per_sample > 32 || s->bits_per_sample < 1) {
350	avpriv_request_sample(avctx, "bits per sample is %d", s->bits_per_sample);
351	return AVERROR_PATCHWELCOME;
352	}
353	} else {
354	avpriv_request_sample(avctx, "Unknown extradata size");
355	return AVERROR_PATCHWELCOME;
356	}
357
358	if (avctx->codec_id != AV_CODEC_ID_WMAPRO && avctx->channels > 2) {
359	s->nb_channels = 2;
360	} else {
361	s->nb_channels = avctx->channels;
362	}
363
364	/** generic init */
365	s->log2_frame_size = av_log2(avctx->block_align) + 4;
366	if (s->log2_frame_size > 25) {
367	avpriv_request_sample(avctx, "Large block align");
368	return AVERROR_PATCHWELCOME;
369	}
370
371	/** frame info */
372	if (avctx->codec_id != AV_CODEC_ID_WMAPRO)
373	s->skip_frame = 0;
374	else
375	s->skip_frame = 1; /* skip first frame */
376
377	s->packet_loss = 1;
378	s->len_prefix = (s->decode_flags & 0x40);
379
380	/** get frame len */
381	if (avctx->codec_id == AV_CODEC_ID_WMAPRO) {
382	bits = ff_wma_get_frame_len_bits(avctx->sample_rate, 3, s->decode_flags);
383	if (bits > WMAPRO_BLOCK_MAX_BITS) {
384	avpriv_request_sample(avctx, "14-bit block sizes");
385	return AVERROR_PATCHWELCOME;
386	}
387	s->samples_per_frame = 1 << bits;
388	} else {
389	s->samples_per_frame = 512;
390	}
391
392	/** subframe info */
393	log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
394	s->max_num_subframes = 1 << log2_max_num_subframes;
395	if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
396	s->max_subframe_len_bit = 1;
397	s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
398
399	num_possible_block_sizes = log2_max_num_subframes + 1;
400	s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
401	s->dynamic_range_compression = (s->decode_flags & 0x80);
402
403	if (s->max_num_subframes > MAX_SUBFRAMES) {
404	av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %"PRId8"\n",
405	s->max_num_subframes);
406	return AVERROR_INVALIDDATA;
407	}
408
409	if (s->min_samples_per_subframe < WMAPRO_BLOCK_MIN_SIZE) {
410	av_log(avctx, AV_LOG_ERROR, "min_samples_per_subframe of %d too small\n",
411	s->min_samples_per_subframe);
412	return AVERROR_INVALIDDATA;
413	}
414
415	if (s->avctx->sample_rate <= 0) {
416	av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
417	return AVERROR_INVALIDDATA;
418	}
419
420	if (s->nb_channels <= 0) {
421	av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n",
422	s->nb_channels);
423	return AVERROR_INVALIDDATA;
424	} else if (s->nb_channels > WMAPRO_MAX_CHANNELS) {
425	avpriv_request_sample(avctx,
426	"More than %d channels", WMAPRO_MAX_CHANNELS);
427	return AVERROR_PATCHWELCOME;
428	}
429
430	/** init previous block len */
431	for (i = 0; i < s->nb_channels; i++)
432	s->channel[i].prev_block_len = s->samples_per_frame;
433
434	/** extract lfe channel position */
435	s->lfe_channel = -1;
436
437	if (channel_mask & 8) {
438	unsigned int mask;
439	for (mask = 1; mask < 16; mask <<= 1) {
440	if (channel_mask & mask)
441	++s->lfe_channel;
442	}
443	}
444
445	INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
446	scale_huffbits, 1, 1,
447	scale_huffcodes, 2, 2, 616);
448
449	INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
450	scale_rl_huffbits, 1, 1,
451	scale_rl_huffcodes, 4, 4, 1406);
452
453	INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
454	coef0_huffbits, 1, 1,
455	coef0_huffcodes, 4, 4, 2108);
456
457	INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
458	coef1_huffbits, 1, 1,
459	coef1_huffcodes, 4, 4, 3912);
460
461	INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
462	vec4_huffbits, 1, 1,
463	vec4_huffcodes, 2, 2, 604);
464
465	INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
466	vec2_huffbits, 1, 1,
467	vec2_huffcodes, 2, 2, 562);
468
469	INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
470	vec1_huffbits, 1, 1,
471	vec1_huffcodes, 2, 2, 562);
472
473	/** calculate number of scale factor bands and their offsets
474	for every possible block size */
475	for (i = 0; i < num_possible_block_sizes; i++) {
476	int subframe_len = s->samples_per_frame >> i;
477	int x;
478	int band = 1;
479	int rate = get_rate(avctx);
480
481	s->sfb_offsets[i][0] = 0;
482
483	for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
484	int offset = (subframe_len * 2 * critical_freq[x]) / rate + 2;
485	offset &= ~3;
486	if (offset > s->sfb_offsets[i][band - 1])
487	s->sfb_offsets[i][band++] = offset;
488
489	if (offset >= subframe_len)
490	break;
491	}
492	s->sfb_offsets[i][band - 1] = subframe_len;
493	s->num_sfb[i] = band - 1;
494	if (s->num_sfb[i] <= 0) {
495	av_log(avctx, AV_LOG_ERROR, "num_sfb invalid\n");
496	return AVERROR_INVALIDDATA;
497	}
498	}
499
500
501	/** Scale factors can be shared between blocks of different size
502	as every block has a different scale factor band layout.
503	The matrix sf_offsets is needed to find the correct scale factor.
504	*/
505
506	for (i = 0; i < num_possible_block_sizes; i++) {
507	int b;
508	for (b = 0; b < s->num_sfb[i]; b++) {
509	int x;
510	int offset = ((s->sfb_offsets[i][b]
511	+ s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
512	for (x = 0; x < num_possible_block_sizes; x++) {
513	int v = 0;
514	while (s->sfb_offsets[x][v + 1] << x < offset) {
515	v++;
516	av_assert0(v < MAX_BANDS);
517	}
518	s->sf_offsets[i][x][b] = v;
519	}
520	}
521	}
522
523	s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
524	if (!s->fdsp)
525	return AVERROR(ENOMEM);
526
527	/** init MDCT, FIXME: only init needed sizes */
528	for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
529	ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
530	1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
531	/ (1 << (s->bits_per_sample - 1)));
532
533	/** init MDCT windows: simple sine window */
534	for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
535	const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
536	ff_init_ff_sine_windows(win_idx);
537	s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
538	}
539
540	/** calculate subwoofer cutoff values */
541	for (i = 0; i < num_possible_block_sizes; i++) {
542	int block_size = s->samples_per_frame >> i;
543	int cutoff = (440*block_size + 3LL * (s->avctx->sample_rate >> 1) - 1)
544	/ s->avctx->sample_rate;
545	s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
546	}
547
548	/** calculate sine values for the decorrelation matrix */
549	for (i = 0; i < 33; i++)
550	sin64[i] = sin(i*M_PI / 64.0);
551
552	if (avctx->debug & FF_DEBUG_BITSTREAM)
553	dump_context(s);
554
555	avctx->channel_layout = channel_mask;
556
557	return 0;
558	}
559
560	/**
561	*@brief Initialize the decoder.
562	*@param avctx codec context
563	*@return 0 on success, -1 otherwise
564	*/
565	static av_cold int wmapro_decode_init(AVCodecContext *avctx)
566	{
567	WMAProDecodeCtx *s = avctx->priv_data;
568
569	return decode_init(s, avctx);
570	}
571
572	/**
573	*@brief Decode the subframe length.
574	*@param s context
575	*@param offset sample offset in the frame
576	*@return decoded subframe length on success, < 0 in case of an error
577	*/
578	static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
579	{
580	int frame_len_shift = 0;
581	int subframe_len;
582
583	/** no need to read from the bitstream when only one length is possible */
584	if (offset == s->samples_per_frame - s->min_samples_per_subframe)
585	return s->min_samples_per_subframe;
586
587	if (get_bits_left(&s->gb) < 1)
588	return AVERROR_INVALIDDATA;
589
590	/** 1 bit indicates if the subframe is of maximum length */
591	if (s->max_subframe_len_bit) {
592	if (get_bits1(&s->gb))
593	frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
594	} else
595	frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
596
597	subframe_len = s->samples_per_frame >> frame_len_shift;
598
599	/** sanity check the length */
600	if (subframe_len < s->min_samples_per_subframe ||
601	subframe_len > s->samples_per_frame) {
602	av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
603	subframe_len);
604	return AVERROR_INVALIDDATA;
605	}
606	return subframe_len;
607	}
608
609	/**
610	*@brief Decode how the data in the frame is split into subframes.
611	* Every WMA frame contains the encoded data for a fixed number of
612	* samples per channel. The data for every channel might be split
613	* into several subframes. This function will reconstruct the list of
614	* subframes for every channel.
615	*
616	* If the subframes are not evenly split, the algorithm estimates the
617	* channels with the lowest number of total samples.
618	* Afterwards, for each of these channels a bit is read from the
619	* bitstream that indicates if the channel contains a subframe with the
620	* next subframe size that is going to be read from the bitstream or not.
621	* If a channel contains such a subframe, the subframe size gets added to
622	* the channel's subframe list.
623	* The algorithm repeats these steps until the frame is properly divided
624	* between the individual channels.
625	*
626	*@param s context
627	*@return 0 on success, < 0 in case of an error
628	*/
629	static int decode_tilehdr(WMAProDecodeCtx *s)
630	{
631	uint16_t num_samples[WMAPRO_MAX_CHANNELS] = { 0 };/**< sum of samples for all currently known subframes of a channel */
632	uint8_t contains_subframe[WMAPRO_MAX_CHANNELS]; /**< flag indicating if a channel contains the current subframe */
633	int channels_for_cur_subframe = s->nb_channels; /**< number of channels that contain the current subframe */
634	int fixed_channel_layout = 0; /**< flag indicating that all channels use the same subframe offsets and sizes */
635	int min_channel_len = 0; /**< smallest sum of samples (channels with this length will be processed first) */
636	int c;
637
638	/* Should never consume more than 3073 bits (256 iterations for the
639	* while loop when always the minimum amount of 128 samples is subtracted
640	* from missing samples in the 8 channel case).
641	* 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4)
642	*/
643
644	/** reset tiling information */
645	for (c = 0; c < s->nb_channels; c++)
646	s->channel[c].num_subframes = 0;
647
648	if (s->max_num_subframes == 1 || get_bits1(&s->gb))
649	fixed_channel_layout = 1;
650
651	/** loop until the frame data is split between the subframes */
652	do {
653	int subframe_len;
654
655	/** check which channels contain the subframe */
656	for (c = 0; c < s->nb_channels; c++) {
657	if (num_samples[c] == min_channel_len) {
658	if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
659	(min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
660	contains_subframe[c] = 1;
661	else
662	contains_subframe[c] = get_bits1(&s->gb);
663	} else
664	contains_subframe[c] = 0;
665	}
666
667	/** get subframe length, subframe_len == 0 is not allowed */
668	if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
669	return AVERROR_INVALIDDATA;
670
671	/** add subframes to the individual channels and find new min_channel_len */
672	min_channel_len += subframe_len;
673	for (c = 0; c < s->nb_channels; c++) {
674	WMAProChannelCtx* chan = &s->channel[c];
675
676	if (contains_subframe[c]) {
677	if (chan->num_subframes >= MAX_SUBFRAMES) {
678	av_log(s->avctx, AV_LOG_ERROR,
679	"broken frame: num subframes > 31\n");
680	return AVERROR_INVALIDDATA;
681	}
682	chan->subframe_len[chan->num_subframes] = subframe_len;
683	num_samples[c] += subframe_len;
684	++chan->num_subframes;
685	if (num_samples[c] > s->samples_per_frame) {
686	av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
687	"channel len > samples_per_frame\n");
688	return AVERROR_INVALIDDATA;
689	}
690	} else if (num_samples[c] <= min_channel_len) {
691	if (num_samples[c] < min_channel_len) {
692	channels_for_cur_subframe = 0;
693	min_channel_len = num_samples[c];
694	}
695	++channels_for_cur_subframe;
696	}
697	}
698	} while (min_channel_len < s->samples_per_frame);
699
700	for (c = 0; c < s->nb_channels; c++) {
701	int i;
702	int offset = 0;
703	for (i = 0; i < s->channel[c].num_subframes; i++) {
704	ff_dlog(s->avctx, "frame[%"PRIu32"] channel[%i] subframe[%i]"
705	" len %i\n", s->frame_num, c, i,
706	s->channel[c].subframe_len[i]);
707	s->channel[c].subframe_offset[i] = offset;
708	offset += s->channel[c].subframe_len[i];
709	}
710	}
711
712	return 0;
713	}
714
715	/**
716	*@brief Calculate a decorrelation matrix from the bitstream parameters.
717	*@param s codec context
718	*@param chgroup channel group for which the matrix needs to be calculated
719	*/
720	static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
721	WMAProChannelGrp *chgroup)
722	{
723	int i;
724	int offset = 0;
725	int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
726	memset(chgroup->decorrelation_matrix, 0, s->nb_channels *
727	s->nb_channels * sizeof(*chgroup->decorrelation_matrix));
728
729	for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
730	rotation_offset[i] = get_bits(&s->gb, 6);
731
732	for (i = 0; i < chgroup->num_channels; i++)
733	chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
734	get_bits1(&s->gb) ? 1.0 : -1.0;
735
736	for (i = 1; i < chgroup->num_channels; i++) {
737	int x;
738	for (x = 0; x < i; x++) {
739	int y;
740	for (y = 0; y < i + 1; y++) {
741	float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
742	float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
743	int n = rotation_offset[offset + x];
744	float sinv;
745	float cosv;
746
747	if (n < 32) {
748	sinv = sin64[n];
749	cosv = sin64[32 - n];
750	} else {
751	sinv = sin64[64 - n];
752	cosv = -sin64[n - 32];
753	}
754
755	chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
756	(v1 * sinv) - (v2 * cosv);
757	chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
758	(v1 * cosv) + (v2 * sinv);
759	}
760	}
761	offset += i;
762	}
763	}
764
765	/**
766	*@brief Decode channel transformation parameters
767	*@param s codec context
768	*@return >= 0 in case of success, < 0 in case of bitstream errors
769	*/
770	static int decode_channel_transform(WMAProDecodeCtx* s)
771	{
772	int i;
773	/* should never consume more than 1921 bits for the 8 channel case
774	* 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS
775	* + MAX_CHANNELS + MAX_BANDS + 1)
776	*/
777
778	/** in the one channel case channel transforms are pointless */
779	s->num_chgroups = 0;
780	if (s->nb_channels > 1) {
781	int remaining_channels = s->channels_for_cur_subframe;
782
783	if (get_bits1(&s->gb)) {
784	avpriv_request_sample(s->avctx,
785	"Channel transform bit");
786	return AVERROR_PATCHWELCOME;
787	}
788
789	for (s->num_chgroups = 0; remaining_channels &&
790	s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
791	WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
792	float** channel_data = chgroup->channel_data;
793	chgroup->num_channels = 0;
794	chgroup->transform = 0;
795
796	/** decode channel mask */
797	if (remaining_channels > 2) {
798	for (i = 0; i < s->channels_for_cur_subframe; i++) {
799	int channel_idx = s->channel_indexes_for_cur_subframe[i];
800	if (!s->channel[channel_idx].grouped
801	&& get_bits1(&s->gb)) {
802	++chgroup->num_channels;
803	s->channel[channel_idx].grouped = 1;
804	*channel_data++ = s->channel[channel_idx].coeffs;
805	}
806	}
807	} else {
808	chgroup->num_channels = remaining_channels;
809	for (i = 0; i < s->channels_for_cur_subframe; i++) {
810	int channel_idx = s->channel_indexes_for_cur_subframe[i];
811	if (!s->channel[channel_idx].grouped)
812	*channel_data++ = s->channel[channel_idx].coeffs;
813	s->channel[channel_idx].grouped = 1;
814	}
815	}
816
817	/** decode transform type */
818	if (chgroup->num_channels == 2) {
819	if (get_bits1(&s->gb)) {
820	if (get_bits1(&s->gb)) {
821	avpriv_request_sample(s->avctx,
822	"Unknown channel transform type");
823	return AVERROR_PATCHWELCOME;
824	}
825	} else {
826	chgroup->transform = 1;
827	if (s->nb_channels == 2) {
828	chgroup->decorrelation_matrix[0] = 1.0;
829	chgroup->decorrelation_matrix[1] = -1.0;
830	chgroup->decorrelation_matrix[2] = 1.0;
831	chgroup->decorrelation_matrix[3] = 1.0;
832	} else {
833	/** cos(pi/4) */
834	chgroup->decorrelation_matrix[0] = 0.70703125;
835	chgroup->decorrelation_matrix[1] = -0.70703125;
836	chgroup->decorrelation_matrix[2] = 0.70703125;
837	chgroup->decorrelation_matrix[3] = 0.70703125;
838	}
839	}
840	} else if (chgroup->num_channels > 2) {
841	if (get_bits1(&s->gb)) {
842	chgroup->transform = 1;
843	if (get_bits1(&s->gb)) {
844	decode_decorrelation_matrix(s, chgroup);
845	} else {
846	/** FIXME: more than 6 coupled channels not supported */
847	if (chgroup->num_channels > 6) {
848	avpriv_request_sample(s->avctx,
849	"Coupled channels > 6");
850	} else {
851	memcpy(chgroup->decorrelation_matrix,
852	default_decorrelation[chgroup->num_channels],
853	chgroup->num_channels * chgroup->num_channels *
854	sizeof(*chgroup->decorrelation_matrix));
855	}
856	}
857	}
858	}
859
860	/** decode transform on / off */
861	if (chgroup->transform) {
862	if (!get_bits1(&s->gb)) {
863	int i;
864	/** transform can be enabled for individual bands */
865	for (i = 0; i < s->num_bands; i++) {
866	chgroup->transform_band[i] = get_bits1(&s->gb);
867	}
868	} else {
869	memset(chgroup->transform_band, 1, s->num_bands);
870	}
871	}
872	remaining_channels -= chgroup->num_channels;
873	}
874	}
875	return 0;
876	}
877
878	/**
879	*@brief Extract the coefficients from the bitstream.
880	*@param s codec context
881	*@param c current channel number
882	*@return 0 on success, < 0 in case of bitstream errors
883	*/
884	static int decode_coeffs(WMAProDecodeCtx *s, int c)
885	{
886	/* Integers 0..15 as single-precision floats. The table saves a
887	costly int to float conversion, and storing the values as
888	integers allows fast sign-flipping. */
889	static const uint32_t fval_tab[16] = {
890	0x00000000, 0x3f800000, 0x40000000, 0x40400000,
891	0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
892	0x41000000, 0x41100000, 0x41200000, 0x41300000,
893	0x41400000, 0x41500000, 0x41600000, 0x41700000,
894	};
895	int vlctable;
896	VLC* vlc;
897	WMAProChannelCtx* ci = &s->channel[c];
898	int rl_mode = 0;
899	int cur_coeff = 0;
900	int num_zeros = 0;
901	const uint16_t* run;
902	const float* level;
903
904	ff_dlog(s->avctx, "decode coefficients for channel %i\n", c);
905
906	vlctable = get_bits1(&s->gb);
907	vlc = &coef_vlc[vlctable];
908
909	if (vlctable) {
910	run = coef1_run;
911	level = coef1_level;
912	} else {
913	run = coef0_run;
914	level = coef0_level;
915	}
916
917	/** decode vector coefficients (consumes up to 167 bits per iteration for
918	4 vector coded large values) */
919	while ((s->transmit_num_vec_coeffs || !rl_mode) &&
920	(cur_coeff + 3 < ci->num_vec_coeffs)) {
921	uint32_t vals[4];
922	int i;
923	unsigned int idx;
924
925	idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
926
927	if (idx == HUFF_VEC4_SIZE - 1) {
928	for (i = 0; i < 4; i += 2) {
929	idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
930	if (idx == HUFF_VEC2_SIZE - 1) {
931	uint32_t v0, v1;
932	v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
933	if (v0 == HUFF_VEC1_SIZE - 1)
934	v0 += ff_wma_get_large_val(&s->gb);
935	v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
936	if (v1 == HUFF_VEC1_SIZE - 1)
937	v1 += ff_wma_get_large_val(&s->gb);
938	vals[i ] = av_float2int(v0);
939	vals[i+1] = av_float2int(v1);
940	} else {
941	vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
942	vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
943	}
944	}
945	} else {
946	vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
947	vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
948	vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
949	vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
950	}
951
952	/** decode sign */
953	for (i = 0; i < 4; i++) {
954	if (vals[i]) {
955	uint32_t sign = get_bits1(&s->gb) - 1;
956	AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
957	num_zeros = 0;
958	} else {
959	ci->coeffs[cur_coeff] = 0;
960	/** switch to run level mode when subframe_len / 128 zeros
961	were found in a row */
962	rl_mode |= (++num_zeros > s->subframe_len >> 8);
963	}
964	++cur_coeff;
965	}
966	}
967
968	/** decode run level coded coefficients */
969	if (cur_coeff < s->subframe_len) {
970	memset(&ci->coeffs[cur_coeff], 0,
971	sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
972	if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
973	level, run, 1, ci->coeffs,
974	cur_coeff, s->subframe_len,
975	s->subframe_len, s->esc_len, 0))
976	return AVERROR_INVALIDDATA;
977	}
978
979	return 0;
980	}
981
982	/**
983	*@brief Extract scale factors from the bitstream.
984	*@param s codec context
985	*@return 0 on success, < 0 in case of bitstream errors
986	*/
987	static int decode_scale_factors(WMAProDecodeCtx* s)
988	{
989	int i;
990
991	/** should never consume more than 5344 bits
992	* MAX_CHANNELS * (1 + MAX_BANDS * 23)
993	*/
994
995	for (i = 0; i < s->channels_for_cur_subframe; i++) {
996	int c = s->channel_indexes_for_cur_subframe[i];
997	int* sf;
998	int* sf_end;
999	s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
1000	sf_end = s->channel[c].scale_factors + s->num_bands;
1001
1002	/** resample scale factors for the new block size
1003	* as the scale factors might need to be resampled several times
1004	* before some new values are transmitted, a backup of the last
1005	* transmitted scale factors is kept in saved_scale_factors
1006	*/
1007	if (s->channel[c].reuse_sf) {
1008	const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
1009	int b;
1010	for (b = 0; b < s->num_bands; b++)
1011	s->channel[c].scale_factors[b] =
1012	s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
1013	}
1014
1015	if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
1016
1017	if (!s->channel[c].reuse_sf) {
1018	int val;
1019	/** decode DPCM coded scale factors */
1020	s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
1021	val = 45 / s->channel[c].scale_factor_step;
1022	for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
1023	val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
1024	*sf = val;
1025	}
1026	} else {
1027	int i;
1028	/** run level decode differences to the resampled factors */
1029	for (i = 0; i < s->num_bands; i++) {
1030	int idx;
1031	int skip;
1032	int val;
1033	int sign;
1034
1035	idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
1036
1037	if (!idx) {
1038	uint32_t code = get_bits(&s->gb, 14);
1039	val = code >> 6;
1040	sign = (code & 1) - 1;
1041	skip = (code & 0x3f) >> 1;
1042	} else if (idx == 1) {
1043	break;
1044	} else {
1045	skip = scale_rl_run[idx];
1046	val = scale_rl_level[idx];
1047	sign = get_bits1(&s->gb)-1;
1048	}
1049
1050	i += skip;
1051	if (i >= s->num_bands) {
1052	av_log(s->avctx, AV_LOG_ERROR,
1053	"invalid scale factor coding\n");
1054	return AVERROR_INVALIDDATA;
1055	}
1056	s->channel[c].scale_factors[i] += (val ^ sign) - sign;
1057	}
1058	}
1059	/** swap buffers */
1060	s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
1061	s->channel[c].table_idx = s->table_idx;
1062	s->channel[c].reuse_sf = 1;
1063	}
1064
1065	/** calculate new scale factor maximum */
1066	s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
1067	for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
1068	s->channel[c].max_scale_factor =
1069	FFMAX(s->channel[c].max_scale_factor, *sf);
1070	}
1071
1072	}
1073	return 0;
1074	}
1075
1076	/**
1077	*@brief Reconstruct the individual channel data.
1078	*@param s codec context
1079	*/
1080	static void inverse_channel_transform(WMAProDecodeCtx *s)
1081	{
1082	int i;
1083
1084	for (i = 0; i < s->num_chgroups; i++) {
1085	if (s->chgroup[i].transform) {
1086	float data[WMAPRO_MAX_CHANNELS];
1087	const int num_channels = s->chgroup[i].num_channels;
1088	float** ch_data = s->chgroup[i].channel_data;
1089	float** ch_end = ch_data + num_channels;
1090	const int8_t* tb = s->chgroup[i].transform_band;
1091	int16_t* sfb;
1092
1093	/** multichannel decorrelation */
1094	for (sfb = s->cur_sfb_offsets;
1095	sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
1096	int y;
1097	if (*tb++ == 1) {
1098	/** multiply values with the decorrelation_matrix */
1099	for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
1100	const float* mat = s->chgroup[i].decorrelation_matrix;
1101	const float* data_end = data + num_channels;
1102	float* data_ptr = data;
1103	float** ch;
1104
1105	for (ch = ch_data; ch < ch_end; ch++)
1106	*data_ptr++ = (*ch)[y];
1107
1108	for (ch = ch_data; ch < ch_end; ch++) {
1109	float sum = 0;
1110	data_ptr = data;
1111	while (data_ptr < data_end)
1112	sum += *data_ptr++ * *mat++;
1113
1114	(*ch)[y] = sum;
1115	}
1116	}
1117	} else if (s->nb_channels == 2) {
1118	int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
1119	s->fdsp->vector_fmul_scalar(ch_data[0] + sfb[0],
1120	ch_data[0] + sfb[0],
1121	181.0 / 128, len);
1122	s->fdsp->vector_fmul_scalar(ch_data[1] + sfb[0],
1123	ch_data[1] + sfb[0],
1124	181.0 / 128, len);
1125	}
1126	}
1127	}
1128	}
1129	}
1130
1131	/**
1132	*@brief Apply sine window and reconstruct the output buffer.
1133	*@param s codec context
1134	*/
1135	static void wmapro_window(WMAProDecodeCtx *s)
1136	{
1137	int i;
1138	for (i = 0; i < s->channels_for_cur_subframe; i++) {
1139	int c = s->channel_indexes_for_cur_subframe[i];
1140	const float* window;
1141	int winlen = s->channel[c].prev_block_len;
1142	float* start = s->channel[c].coeffs - (winlen >> 1);
1143
1144	if (s->subframe_len < winlen) {
1145	start += (winlen - s->subframe_len) >> 1;
1146	winlen = s->subframe_len;
1147	}
1148
1149	window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
1150
1151	winlen >>= 1;
1152
1153	s->fdsp->vector_fmul_window(start, start, start + winlen,
1154	window, winlen);
1155
1156	s->channel[c].prev_block_len = s->subframe_len;
1157	}
1158	}
1159
1160	/**
1161	*@brief Decode a single subframe (block).
1162	*@param s codec context
1163	*@return 0 on success, < 0 when decoding failed
1164	*/
1165	static int decode_subframe(WMAProDecodeCtx *s)
1166	{
1167	int offset = s->samples_per_frame;
1168	int subframe_len = s->samples_per_frame;
1169	int i;
1170	int total_samples = s->samples_per_frame * s->nb_channels;
1171	int transmit_coeffs = 0;
1172	int cur_subwoofer_cutoff;
1173
1174	s->subframe_offset = get_bits_count(&s->gb);
1175
1176	/** reset channel context and find the next block offset and size
1177	== the next block of the channel with the smallest number of
1178	decoded samples
1179	*/
1180	for (i = 0; i < s->nb_channels; i++) {
1181	s->channel[i].grouped = 0;
1182	if (offset > s->channel[i].decoded_samples) {
1183	offset = s->channel[i].decoded_samples;
1184	subframe_len =
1185	s->channel[i].subframe_len[s->channel[i].cur_subframe];
1186	}
1187	}
1188
1189	ff_dlog(s->avctx,
1190	"processing subframe with offset %i len %i\n", offset, subframe_len);
1191
1192	/** get a list of all channels that contain the estimated block */
1193	s->channels_for_cur_subframe = 0;
1194	for (i = 0; i < s->nb_channels; i++) {
1195	const int cur_subframe = s->channel[i].cur_subframe;
1196	/** subtract already processed samples */
1197	total_samples -= s->channel[i].decoded_samples;
1198
1199	/** and count if there are multiple subframes that match our profile */
1200	if (offset == s->channel[i].decoded_samples &&
1201	subframe_len == s->channel[i].subframe_len[cur_subframe]) {
1202	total_samples -= s->channel[i].subframe_len[cur_subframe];
1203	s->channel[i].decoded_samples +=
1204	s->channel[i].subframe_len[cur_subframe];
1205	s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
1206	++s->channels_for_cur_subframe;
1207	}
1208	}
1209
1210	/** check if the frame will be complete after processing the
1211	estimated block */
1212	if (!total_samples)
1213	s->parsed_all_subframes = 1;
1214
1215
1216	ff_dlog(s->avctx, "subframe is part of %i channels\n",
1217	s->channels_for_cur_subframe);
1218
1219	/** calculate number of scale factor bands and their offsets */
1220	s->table_idx = av_log2(s->samples_per_frame/subframe_len);
1221	s->num_bands = s->num_sfb[s->table_idx];
1222	s->cur_sfb_offsets = s->sfb_offsets[s->table_idx];
1223	cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
1224
1225	/** configure the decoder for the current subframe */
1226	offset += s->samples_per_frame >> 1;
1227
1228	for (i = 0; i < s->channels_for_cur_subframe; i++) {
1229	int c = s->channel_indexes_for_cur_subframe[i];
1230
1231	s->channel[c].coeffs = &s->channel[c].out[offset];
1232	}
1233
1234	s->subframe_len = subframe_len;
1235	s->esc_len = av_log2(s->subframe_len - 1) + 1;
1236
1237	/** skip extended header if any */
1238	if (get_bits1(&s->gb)) {
1239	int num_fill_bits;
1240	if (!(num_fill_bits = get_bits(&s->gb, 2))) {
1241	int len = get_bits(&s->gb, 4);
1242	num_fill_bits = get_bitsz(&s->gb, len) + 1;
1243	}
1244
1245	if (num_fill_bits >= 0) {
1246	if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
1247	av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
1248	return AVERROR_INVALIDDATA;
1249	}
1250
1251	skip_bits_long(&s->gb, num_fill_bits);
1252	}
1253	}
1254
1255	/** no idea for what the following bit is used */
1256	if (get_bits1(&s->gb)) {
1257	avpriv_request_sample(s->avctx, "Reserved bit");
1258	return AVERROR_PATCHWELCOME;
1259	}
1260
1261
1262	if (decode_channel_transform(s) < 0)
1263	return AVERROR_INVALIDDATA;
1264
1265
1266	for (i = 0; i < s->channels_for_cur_subframe; i++) {
1267	int c = s->channel_indexes_for_cur_subframe[i];
1268	if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
1269	transmit_coeffs = 1;
1270	}
1271
1272	av_assert0(s->subframe_len <= WMAPRO_BLOCK_MAX_SIZE);
1273	if (transmit_coeffs) {
1274	int step;
1275	int quant_step = 90 * s->bits_per_sample >> 4;
1276
1277	/** decode number of vector coded coefficients */
1278	if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
1279	int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
1280	for (i = 0; i < s->channels_for_cur_subframe; i++) {
1281	int c = s->channel_indexes_for_cur_subframe[i];
1282	int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
1283	if (num_vec_coeffs > s->subframe_len) {
1284	av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
1285	return AVERROR_INVALIDDATA;
1286	}
1287	av_assert0(num_vec_coeffs + offset <= FF_ARRAY_ELEMS(s->channel[c].out));
1288	s->channel[c].num_vec_coeffs = num_vec_coeffs;
1289	}
1290	} else {
1291	for (i = 0; i < s->channels_for_cur_subframe; i++) {
1292	int c = s->channel_indexes_for_cur_subframe[i];
1293	s->channel[c].num_vec_coeffs = s->subframe_len;
1294	}
1295	}
1296	/** decode quantization step */
1297	step = get_sbits(&s->gb, 6);
1298	quant_step += step;
1299	if (step == -32 || step == 31) {
1300	const int sign = (step == 31) - 1;
1301	int quant = 0;
1302	while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
1303	(step = get_bits(&s->gb, 5)) == 31) {
1304	quant += 31;
1305	}
1306	quant_step += ((quant + step) ^ sign) - sign;
1307	}
1308	if (quant_step < 0) {
1309	av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
1310	}
1311
1312	/** decode quantization step modifiers for every channel */
1313
1314	if (s->channels_for_cur_subframe == 1) {
1315	s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
1316	} else {
1317	int modifier_len = get_bits(&s->gb, 3);
1318	for (i = 0; i < s->channels_for_cur_subframe; i++) {
1319	int c = s->channel_indexes_for_cur_subframe[i];
1320	s->channel[c].quant_step = quant_step;
1321	if (get_bits1(&s->gb)) {
1322	if (modifier_len) {
1323	s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
1324	} else
1325	++s->channel[c].quant_step;
1326	}
1327	}
1328	}
1329
1330	/** decode scale factors */
1331	if (decode_scale_factors(s) < 0)
1332	return AVERROR_INVALIDDATA;
1333	}
1334
1335	ff_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
1336	get_bits_count(&s->gb) - s->subframe_offset);
1337
1338	/** parse coefficients */
1339	for (i = 0; i < s->channels_for_cur_subframe; i++) {
1340	int c = s->channel_indexes_for_cur_subframe[i];
1341	if (s->channel[c].transmit_coefs &&
1342	get_bits_count(&s->gb) < s->num_saved_bits) {
1343	decode_coeffs(s, c);
1344	} else
1345	memset(s->channel[c].coeffs, 0,
1346	sizeof(*s->channel[c].coeffs) * subframe_len);
1347	}
1348
1349	ff_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
1350	get_bits_count(&s->gb) - s->subframe_offset);
1351
1352	if (transmit_coeffs) {
1353	FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
1354	/** reconstruct the per channel data */
1355	inverse_channel_transform(s);
1356	for (i = 0; i < s->channels_for_cur_subframe; i++) {
1357	int c = s->channel_indexes_for_cur_subframe[i];
1358	const int* sf = s->channel[c].scale_factors;
1359	int b;
1360
1361	if (c == s->lfe_channel)
1362	memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
1363	(subframe_len - cur_subwoofer_cutoff));
1364
1365	/** inverse quantization and rescaling */
1366	for (b = 0; b < s->num_bands; b++) {
1367	const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
1368	const int exp = s->channel[c].quant_step -
1369	(s->channel[c].max_scale_factor - *sf++) *
1370	s->channel[c].scale_factor_step;
1371	const float quant = ff_exp10(exp / 20.0);
1372	int start = s->cur_sfb_offsets[b];
1373	s->fdsp->vector_fmul_scalar(s->tmp + start,
1374	s->channel[c].coeffs + start,
1375	quant, end - start);
1376	}
1377
1378	/** apply imdct (imdct_half == DCTIV with reverse) */
1379	mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
1380	}
1381	}
1382
1383	/** window and overlapp-add */
1384	wmapro_window(s);
1385
1386	/** handled one subframe */
1387	for (i = 0; i < s->channels_for_cur_subframe; i++) {
1388	int c = s->channel_indexes_for_cur_subframe[i];
1389	if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
1390	av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
1391	return AVERROR_INVALIDDATA;
1392	}
1393	++s->channel[c].cur_subframe;
1394	}
1395
1396	return 0;
1397	}
1398
1399	/**
1400	*@brief Decode one WMA frame.
1401	*@param s codec context
1402	*@return 0 if the trailer bit indicates that this is the last frame,
1403	* 1 if there are additional frames
1404	*/
1405	static int decode_frame(WMAProDecodeCtx *s, AVFrame *frame, int *got_frame_ptr)
1406	{
1407	GetBitContext* gb = &s->gb;
1408	int more_frames = 0;
1409	int len = 0;
1410	int i;
1411
1412	/** get frame length */
1413	if (s->len_prefix)
1414	len = get_bits(gb, s->log2_frame_size);
1415
1416	ff_dlog(s->avctx, "decoding frame with length %x\n", len);
1417
1418	/** decode tile information */
1419	if (decode_tilehdr(s)) {
1420	s->packet_loss = 1;
1421	return 0;
1422	}
1423
1424	/** read postproc transform */
1425	if (s->nb_channels > 1 && get_bits1(gb)) {
1426	if (get_bits1(gb)) {
1427	for (i = 0; i < s->nb_channels * s->nb_channels; i++)
1428	skip_bits(gb, 4);
1429	}
1430	}
1431
1432	/** read drc info */
1433	if (s->dynamic_range_compression) {
1434	s->drc_gain = get_bits(gb, 8);
1435	ff_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
1436	}
1437
1438	/** no idea what these are for, might be the number of samples
1439	that need to be skipped at the beginning or end of a stream */
1440	if (get_bits1(gb)) {
1441	int av_unused skip;
1442
1443	/** usually true for the first frame */
1444	if (get_bits1(gb)) {
1445	skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1446	ff_dlog(s->avctx, "start skip: %i\n", skip);
1447	}
1448
1449	/** sometimes true for the last frame */
1450	if (get_bits1(gb)) {
1451	skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1452	ff_dlog(s->avctx, "end skip: %i\n", skip);
1453	}
1454
1455	}
1456
1457	ff_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
1458	get_bits_count(gb) - s->frame_offset);
1459
1460	/** reset subframe states */
1461	s->parsed_all_subframes = 0;
1462	for (i = 0; i < s->nb_channels; i++) {
1463	s->channel[i].decoded_samples = 0;
1464	s->channel[i].cur_subframe = 0;
1465	s->channel[i].reuse_sf = 0;
1466	}
1467
1468	/** decode all subframes */
1469	while (!s->parsed_all_subframes) {
1470	if (decode_subframe(s) < 0) {
1471	s->packet_loss = 1;
1472	return 0;
1473	}
1474	}
1475
1476	/** copy samples to the output buffer */
1477	for (i = 0; i < s->nb_channels; i++)
1478	memcpy(frame->extended_data[i], s->channel[i].out,
1479	s->samples_per_frame * sizeof(*s->channel[i].out));
1480
1481	for (i = 0; i < s->nb_channels; i++) {
1482	/** reuse second half of the IMDCT output for the next frame */
1483	memcpy(&s->channel[i].out[0],
1484	&s->channel[i].out[s->samples_per_frame],
1485	s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
1486	}
1487
1488	if (s->skip_frame) {
1489	s->skip_frame = 0;
1490	*got_frame_ptr = 0;
1491	av_frame_unref(frame);
1492	} else {
1493	*got_frame_ptr = 1;
1494	}
1495
1496	if (s->len_prefix) {
1497	if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
1498	/** FIXME: not sure if this is always an error */
1499	av_log(s->avctx, AV_LOG_ERROR,
1500	"frame[%"PRIu32"] would have to skip %i bits\n",
1501	s->frame_num,
1502	len - (get_bits_count(gb) - s->frame_offset) - 1);
1503	s->packet_loss = 1;
1504	return 0;
1505	}
1506
1507	/** skip the rest of the frame data */
1508	skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
1509	} else {
1510	while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
1511	}
1512	}
1513
1514	/** decode trailer bit */
1515	more_frames = get_bits1(gb);
1516
1517	++s->frame_num;
1518	return more_frames;
1519	}
1520
1521	/**
1522	*@brief Calculate remaining input buffer length.
1523	*@param s codec context
1524	*@param gb bitstream reader context
1525	*@return remaining size in bits
1526	*/
1527	static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
1528	{
1529	return s->buf_bit_size - get_bits_count(gb);
1530	}
1531
1532	/**
1533	*@brief Fill the bit reservoir with a (partial) frame.
1534	*@param s codec context
1535	*@param gb bitstream reader context
1536	*@param len length of the partial frame
1537	*@param append decides whether to reset the buffer or not
1538	*/
1539	static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
1540	int append)
1541	{
1542	int buflen;
1543
1544	/** when the frame data does not need to be concatenated, the input buffer
1545	is reset and additional bits from the previous frame are copied
1546	and skipped later so that a fast byte copy is possible */
1547
1548	if (!append) {
1549	s->frame_offset = get_bits_count(gb) & 7;
1550	s->num_saved_bits = s->frame_offset;
1551	init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
1552	}
1553
1554	buflen = (put_bits_count(&s->pb) + len + 8) >> 3;
1555
1556	if (len <= 0 || buflen > MAX_FRAMESIZE) {
1557	avpriv_request_sample(s->avctx, "Too small input buffer");
1558	s->packet_loss = 1;
1559	return;
1560	}
1561
1562	av_assert0(len <= put_bits_left(&s->pb));
1563
1564	s->num_saved_bits += len;
1565	if (!append) {
1566	avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
1567	s->num_saved_bits);
1568	} else {
1569	int align = 8 - (get_bits_count(gb) & 7);
1570	align = FFMIN(align, len);
1571	put_bits(&s->pb, align, get_bits(gb, align));
1572	len -= align;
1573	avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
1574	}
1575	skip_bits_long(gb, len);
1576
1577	{
1578	PutBitContext tmp = s->pb;
1579	flush_put_bits(&tmp);
1580	}
1581
1582	init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
1583	skip_bits(&s->gb, s->frame_offset);
1584	}
1585
1586	static int decode_packet(AVCodecContext *avctx, WMAProDecodeCtx *s,
1587	void *data, int *got_frame_ptr, AVPacket *avpkt)
1588	{
1589	GetBitContext* gb = &s->pgb;
1590	const uint8_t* buf = avpkt->data;
1591	int buf_size = avpkt->size;
1592	int num_bits_prev_frame;
1593	int packet_sequence_number;
1594
1595	*got_frame_ptr = 0;
1596
1597	if (s->packet_done || s->packet_loss) {
1598	s->packet_done = 0;
1599
1600	/** sanity check for the buffer length */
1601	if (avctx->codec_id == AV_CODEC_ID_WMAPRO && buf_size < avctx->block_align) {
1602	av_log(avctx, AV_LOG_ERROR, "Input packet too small (%d < %d)\n",
1603	buf_size, avctx->block_align);
1604	return AVERROR_INVALIDDATA;
1605	}
1606
1607	if (avctx->codec_id == AV_CODEC_ID_WMAPRO) {
1608	s->next_packet_start = buf_size - avctx->block_align;
1609	buf_size = avctx->block_align;
1610	} else {
1611	s->next_packet_start = buf_size - FFMIN(buf_size, avctx->block_align);
1612	buf_size = FFMIN(buf_size, avctx->block_align);
1613	}
1614	s->buf_bit_size = buf_size << 3;
1615
1616	/** parse packet header */
1617	init_get_bits(gb, buf, s->buf_bit_size);
1618	if (avctx->codec_id != AV_CODEC_ID_XMA2) {
1619	packet_sequence_number = get_bits(gb, 4);
1620	skip_bits(gb, 2);
1621	} else {
1622	int num_frames = get_bits(gb, 6);
1623	ff_dlog(avctx, "packet[%d]: number of frames %d\n", avctx->frame_number, num_frames);
1624	packet_sequence_number = 0;
1625	}
1626
1627	/** get number of bits that need to be added to the previous frame */
1628	num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
1629	if (avctx->codec_id != AV_CODEC_ID_WMAPRO) {
1630	skip_bits(gb, 3);
1631	s->skip_packets = get_bits(gb, 8);
1632	ff_dlog(avctx, "packet[%d]: skip packets %d\n", avctx->frame_number, s->skip_packets);
1633	}
1634
1635	ff_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
1636	num_bits_prev_frame);
1637
1638	/** check for packet loss */
1639	if (avctx->codec_id == AV_CODEC_ID_WMAPRO && !s->packet_loss &&
1640	((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
1641	s->packet_loss = 1;
1642	av_log(avctx, AV_LOG_ERROR,
1643	"Packet loss detected! seq %"PRIx8" vs %x\n",
1644	s->packet_sequence_number, packet_sequence_number);
1645	}
1646	s->packet_sequence_number = packet_sequence_number;
1647
1648	if (num_bits_prev_frame > 0) {
1649	int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
1650	if (num_bits_prev_frame >= remaining_packet_bits) {
1651	num_bits_prev_frame = remaining_packet_bits;
1652	s->packet_done = 1;
1653	}
1654
1655	/** append the previous frame data to the remaining data from the
1656	previous packet to create a full frame */
1657	save_bits(s, gb, num_bits_prev_frame, 1);
1658	ff_dlog(avctx, "accumulated %x bits of frame data\n",
1659	s->num_saved_bits - s->frame_offset);
1660
1661	/** decode the cross packet frame if it is valid */
1662	if (!s->packet_loss)
1663	decode_frame(s, data, got_frame_ptr);
1664	} else if (s->num_saved_bits - s->frame_offset) {
1665	ff_dlog(avctx, "ignoring %x previously saved bits\n",
1666	s->num_saved_bits - s->frame_offset);
1667	}
1668
1669	if (s->packet_loss) {
1670	/** reset number of saved bits so that the decoder
1671	does not start to decode incomplete frames in the
1672	s->len_prefix == 0 case */
1673	s->num_saved_bits = 0;
1674	s->packet_loss = 0;
1675	}
1676	} else {
1677	int frame_size;
1678	s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
1679	init_get_bits(gb, avpkt->data, s->buf_bit_size);
1680	skip_bits(gb, s->packet_offset);
1681	if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
1682	(frame_size = show_bits(gb, s->log2_frame_size)) &&
1683	frame_size <= remaining_bits(s, gb)) {
1684	save_bits(s, gb, frame_size, 0);
1685	if (!s->packet_loss)
1686	s->packet_done = !decode_frame(s, data, got_frame_ptr);
1687	} else if (!s->len_prefix
1688	&& s->num_saved_bits > get_bits_count(&s->gb)) {
1689	/** when the frames do not have a length prefix, we don't know
1690	the compressed length of the individual frames
1691	however, we know what part of a new packet belongs to the
1692	previous frame
1693	therefore we save the incoming packet first, then we append
1694	the "previous frame" data from the next packet so that
1695	we get a buffer that only contains full frames */
1696	s->packet_done = !decode_frame(s, data, got_frame_ptr);
1697	} else {
1698	s->packet_done = 1;
1699	}
1700	}
1701
1702	if (remaining_bits(s, gb) < 0) {
1703	av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -remaining_bits(s, gb));
1704	s->packet_loss = 1;
1705	}
1706
1707	if (s->packet_done && !s->packet_loss &&
1708	remaining_bits(s, gb) > 0) {
1709	/** save the rest of the data so that it can be decoded
1710	with the next packet */
1711	save_bits(s, gb, remaining_bits(s, gb), 0);
1712	}
1713
1714	s->packet_offset = get_bits_count(gb) & 7;
1715	if (s->packet_loss)
1716	return AVERROR_INVALIDDATA;
1717
1718	return get_bits_count(gb) >> 3;
1719	}
1720
1721	/**
1722	*@brief Decode a single WMA packet.
1723	*@param avctx codec context
1724	*@param data the output buffer
1725	*@param avpkt input packet
1726	*@return number of bytes that were read from the input buffer
1727	*/
1728	static int wmapro_decode_packet(AVCodecContext *avctx, void *data,
1729	int *got_frame_ptr, AVPacket *avpkt)
1730	{
1731	WMAProDecodeCtx *s = avctx->priv_data;
1732	AVFrame *frame = data;
1733	int ret;
1734
1735	/* get output buffer */
1736	frame->nb_samples = s->samples_per_frame;
1737	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
1738	s->packet_loss = 1;
1739	return 0;
1740	}
1741
1742	return decode_packet(avctx, s, data, got_frame_ptr, avpkt);
1743	}
1744
1745	static int xma_decode_packet(AVCodecContext *avctx, void *data,
1746	int *got_frame_ptr, AVPacket *avpkt)
1747	{
1748	XMADecodeCtx *s = avctx->priv_data;
1749	int got_stream_frame_ptr = 0;
1750	AVFrame *frame = data;
1751	int i, ret, offset = INT_MAX;
1752
1753	ret = decode_packet(avctx, &s->xma[s->current_stream], s->frames[s->current_stream],
1754	&got_stream_frame_ptr, avpkt);
1755
1756	if (got_stream_frame_ptr) {
1757	memcpy(&s->samples[s->current_stream * 2 + 0][s->offset[s->current_stream] * 512],
1758	s->frames[s->current_stream]->extended_data[0], 512 * 4);
1759	if (avctx->channels > 1)
1760	memcpy(&s->samples[s->current_stream * 2 + 1][s->offset[s->current_stream] * 512],
1761	s->frames[s->current_stream]->extended_data[1], 512 * 4);
1762	s->offset[s->current_stream]++;
1763	} else if (ret < 0) {
1764	memset(s->offset, 0, sizeof(s->offset));
1765	s->current_stream = 0;
1766	return ret;
1767	}
1768
1769	if (s->xma[s->current_stream].packet_done ||
1770	s->xma[s->current_stream].packet_loss) {
1771	int bret;
1772
1773	if (s->xma[s->current_stream].skip_packets == 0) {
1774	;
1775	} else if (s->xma[0].skip_packets == 0 && avctx->channels >= 2) {
1776	s->current_stream = 0;
1777	} else if (s->xma[1].skip_packets == 0 && avctx->channels >= 4) {
1778	s->current_stream = 1;
1779	} else if (s->xma[2].skip_packets == 0 && avctx->channels >= 6) {
1780	s->current_stream = 2;
1781	} else if (s->xma[3].skip_packets == 0 && avctx->channels == 8) {
1782	s->current_stream = 3;
1783	} else {
1784	int min[2];
1785
1786	min[0] = s->xma[0].skip_packets;
1787	min[1] = i = 0;
1788
1789	for (i = 1; i < avctx->channels / 2; i++) {
1790	if (s->xma[i].skip_packets < min[0]) {
1791	min[1] = i;
1792	min[0] = s->xma[i].skip_packets;
1793	}
1794	}
1795
1796	s->current_stream = min[1];
1797	}
1798
1799	for (i = 0; i < avctx->channels / 2; i++) {
1800	s->xma[i].skip_packets = FFMAX(0, s->xma[i].skip_packets - 1);
1801	}
1802
1803	for (i = 0; i < (avctx->channels + 1) / 2; i++) {
1804	offset = FFMIN(offset, s->offset[i]);
1805	}
1806
1807	if (offset > 0) {
1808	frame->nb_samples = 512 * offset;
1809	if ((bret = ff_get_buffer(avctx, frame, 0)) < 0)
1810	return bret;
1811
1812	for (i = 0; i < (avctx->channels + 1) / 2; i++) {
1813	memcpy(frame->extended_data[i * 2 + 0], s->samples[i * 2 + 0], frame->nb_samples * 4);
1814	if (avctx->channels > 1)
1815	memcpy(frame->extended_data[i * 2 + 1], s->samples[i * 2 + 1], frame->nb_samples * 4);
1816	s->offset[i] -= offset;
1817	if (s->offset[i]) {
1818	memmove(s->samples[i * 2 + 0], s->samples[i * 2 + 0] + frame->nb_samples, s->offset[i] * 4 * 512);
1819	if (avctx->channels > 1)
1820	memmove(s->samples[i * 2 + 1], s->samples[i * 2 + 1] + frame->nb_samples, s->offset[i] * 4 * 512);
1821	}
1822	}
1823
1824	*got_frame_ptr = 1;
1825	}
1826	}
1827
1828	return ret;
1829	}
1830
1831	static av_cold int xma_decode_init(AVCodecContext *avctx)
1832	{
1833	XMADecodeCtx *s = avctx->priv_data;
1834	int i, ret;
1835
1836	if (avctx->channels <= 0 || avctx->channels > 8)
1837	return AVERROR_INVALIDDATA;
1838
1839	for (i = 0; i < (avctx->channels + 1) / 2; i++) {
1840	ret = decode_init(&s->xma[i], avctx);
1841	if (ret < 0)
1842	return ret;
1843	s->frames[i] = av_frame_alloc();
1844	if (!s->frames[i])
1845	return AVERROR(ENOMEM);
1846	s->frames[i]->nb_samples = 512;
1847	if ((ret = ff_get_buffer(avctx, s->frames[i], 0)) < 0) {
1848	return AVERROR(ENOMEM);
1849	}
1850
1851	}
1852
1853	return ret;
1854	}
1855
1856	static av_cold int xma_decode_end(AVCodecContext *avctx)
1857	{
1858	XMADecodeCtx *s = avctx->priv_data;
1859	int i;
1860
1861	for (i = 0; i < avctx->channels / 2; i++) {
1862	decode_end(&s->xma[i]);
1863	av_frame_free(&s->frames[i]);
1864	}
1865
1866	return 0;
1867	}
1868
1869	static void flush(WMAProDecodeCtx *s)
1870	{
1871	int i;
1872	/** reset output buffer as a part of it is used during the windowing of a
1873	new frame */
1874	for (i = 0; i < s->nb_channels; i++)
1875	memset(s->channel[i].out, 0, s->samples_per_frame *
1876	sizeof(*s->channel[i].out));
1877	s->packet_loss = 1;
1878	s->skip_packets = 0;
1879	}
1880
1881
1882	/**
1883	*@brief Clear decoder buffers (for seeking).
1884	*@param avctx codec context
1885	*/
1886	static void wmapro_flush(AVCodecContext *avctx)
1887	{
1888	WMAProDecodeCtx *s = avctx->priv_data;
1889
1890	flush(s);
1891	}
1892
1893	static void xma_flush(AVCodecContext *avctx)
1894	{
1895	XMADecodeCtx *s = avctx->priv_data;
1896	int i;
1897	for (i = 0; i < (avctx->channels + 1) / 2; i++)
1898	flush(&s->xma[i]);
1899
1900	memset(s->offset, 0, sizeof(s->offset));
1901	s->current_stream = 0;
1902	}
1903
1904
1905	/**
1906	*@brief wmapro decoder
1907	*/
1908	AVCodec ff_wmapro_decoder = {
1909	.name = "wmapro",
1910	.long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
1911	.type = AVMEDIA_TYPE_AUDIO,
1912	.id = AV_CODEC_ID_WMAPRO,
1913	.priv_data_size = sizeof(WMAProDecodeCtx),
1914	.init = wmapro_decode_init,
1915	.close = wmapro_decode_end,
1916	.decode = wmapro_decode_packet,
1917	.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
1918	.flush = wmapro_flush,
1919	.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1920	AV_SAMPLE_FMT_NONE },
1921	};
1922
1923	AVCodec ff_xma1_decoder = {
1924	.name = "xma1",
1925	.long_name = NULL_IF_CONFIG_SMALL("Xbox Media Audio 1"),
1926	.type = AVMEDIA_TYPE_AUDIO,
1927	.id = AV_CODEC_ID_XMA1,
1928	.priv_data_size = sizeof(XMADecodeCtx),
1929	.init = xma_decode_init,
1930	.close = xma_decode_end,
1931	.decode = xma_decode_packet,
1932	.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
1933	.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1934	AV_SAMPLE_FMT_NONE },
1935	};
1936
1937	AVCodec ff_xma2_decoder = {
1938	.name = "xma2",
1939	.long_name = NULL_IF_CONFIG_SMALL("Xbox Media Audio 2"),
1940	.type = AVMEDIA_TYPE_AUDIO,
1941	.id = AV_CODEC_ID_XMA2,
1942	.priv_data_size = sizeof(XMADecodeCtx),
1943	.init = xma_decode_init,
1944	.close = xma_decode_end,
1945	.decode = xma_decode_packet,
1946	.flush = xma_flush,
1947	.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
1948	.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1949	AV_SAMPLE_FMT_NONE },
1950	};
1951