2 * Wmapro compatible decoder
3 * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
4 * Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson
6 * This file is part of FFmpeg.
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.
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.
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
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
32 * - windowing and overlapp-add
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
40 * The number of samples and a few other decode flags are stored
41 * as extradata that has to be passed to the decoder.
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.
47 * Example wmapro bitstream (in samples):
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 * ---------------------------------------------------
58 * The frame layouts for the individual channels of a wma frame does not need
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.
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
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
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.
91 #include "libavutil/ffmath.h"
92 #include "libavutil/float_dsp.h"
93 #include "libavutil/intfloat.h"
94 #include "libavutil/intreadwrite.h"
99 #include "wmaprodata.h"
102 #include "wma_common.h"
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 #define XMA_MAX_STREAMS 8
110 #define XMA_MAX_CHANNELS_STREAM 2
111 #define XMA_MAX_CHANNELS (XMA_MAX_STREAMS * XMA_MAX_CHANNELS_STREAM)
113 #define WMAPRO_BLOCK_MIN_BITS 6 ///< log2 of min block size
114 #define WMAPRO_BLOCK_MAX_BITS 13 ///< log2 of max block size
115 #define WMAPRO_BLOCK_MIN_SIZE (1 << WMAPRO_BLOCK_MIN_BITS) ///< minimum block size
116 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size
117 #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes
121 #define SCALEVLCBITS 8
122 #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS)
123 #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS)
124 #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS)
125 #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS)
126 #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS)
128 static VLC sf_vlc; ///< scale factor DPCM vlc
129 static VLC sf_rl_vlc; ///< scale factor run length vlc
130 static VLC vec4_vlc; ///< 4 coefficients per symbol
131 static VLC vec2_vlc; ///< 2 coefficients per symbol
132 static VLC vec1_vlc; ///< 1 coefficient per symbol
133 static VLC coef_vlc[2]; ///< coefficient run length vlc codes
134 static float sin64[33]; ///< sine table for decorrelation
137 * @brief frame specific decoder context for a single channel
139 typedef struct WMAProChannelCtx {
140 int16_t prev_block_len; ///< length of the previous block
141 uint8_t transmit_coefs;
142 uint8_t num_subframes;
143 uint16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
144 uint16_t subframe_offset[MAX_SUBFRAMES]; ///< subframe positions in the current frame
145 uint8_t cur_subframe; ///< current subframe number
146 uint16_t decoded_samples; ///< number of already processed samples
147 uint8_t grouped; ///< channel is part of a group
148 int quant_step; ///< quantization step for the current subframe
149 int8_t reuse_sf; ///< share scale factors between subframes
150 int8_t scale_factor_step; ///< scaling step for the current subframe
151 int max_scale_factor; ///< maximum scale factor for the current subframe
152 int saved_scale_factors[2][MAX_BANDS]; ///< resampled and (previously) transmitted scale factor values
153 int8_t scale_factor_idx; ///< index for the transmitted scale factor values (used for resampling)
154 int* scale_factors; ///< pointer to the scale factor values used for decoding
155 uint8_t table_idx; ///< index in sf_offsets for the scale factor reference block
156 float* coeffs; ///< pointer to the subframe decode buffer
157 uint16_t num_vec_coeffs; ///< number of vector coded coefficients
158 DECLARE_ALIGNED(32, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2]; ///< output buffer
162 * @brief channel group for channel transformations
164 typedef struct WMAProChannelGrp {
165 uint8_t num_channels; ///< number of channels in the group
166 int8_t transform; ///< transform on / off
167 int8_t transform_band[MAX_BANDS]; ///< controls if the transform is enabled for a certain band
168 float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS];
169 float* channel_data[WMAPRO_MAX_CHANNELS]; ///< transformation coefficients
173 * @brief main decoder context
175 typedef struct WMAProDecodeCtx {
176 /* generic decoder variables */
177 AVCodecContext* avctx; ///< codec context for av_log
178 AVFloatDSPContext *fdsp;
179 uint8_t frame_data[MAX_FRAMESIZE +
180 AV_INPUT_BUFFER_PADDING_SIZE];///< compressed frame data
181 PutBitContext pb; ///< context for filling the frame_data buffer
182 FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES]; ///< MDCT context per block size
183 DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE]; ///< IMDCT output buffer
184 const float* windows[WMAPRO_BLOCK_SIZES]; ///< windows for the different block sizes
186 /* frame size dependent frame information (set during initialization) */
187 uint32_t decode_flags; ///< used compression features
188 uint8_t len_prefix; ///< frame is prefixed with its length
189 uint8_t dynamic_range_compression; ///< frame contains DRC data
190 uint8_t bits_per_sample; ///< integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1.0])
191 uint16_t samples_per_frame; ///< number of samples to output
192 uint16_t log2_frame_size;
193 int8_t lfe_channel; ///< lfe channel index
194 uint8_t max_num_subframes;
195 uint8_t subframe_len_bits; ///< number of bits used for the subframe length
196 uint8_t max_subframe_len_bit; ///< flag indicating that the subframe is of maximum size when the first subframe length bit is 1
197 uint16_t min_samples_per_subframe;
198 int8_t num_sfb[WMAPRO_BLOCK_SIZES]; ///< scale factor bands per block size
199 int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor band offsets (multiples of 4)
200 int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor resample matrix
201 int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; ///< subwoofer cutoff values
203 /* packet decode state */
204 GetBitContext pgb; ///< bitstream reader context for the packet
205 int next_packet_start; ///< start offset of the next wma packet in the demuxer packet
206 uint8_t packet_offset; ///< frame offset in the packet
207 uint8_t packet_sequence_number; ///< current packet number
208 int num_saved_bits; ///< saved number of bits
209 int frame_offset; ///< frame offset in the bit reservoir
210 int subframe_offset; ///< subframe offset in the bit reservoir
211 uint8_t packet_loss; ///< set in case of bitstream error
212 uint8_t packet_done; ///< set when a packet is fully decoded
213 uint8_t eof_done; ///< set when EOF reached and extra subframe is written (XMA1/2)
215 /* frame decode state */
216 uint32_t frame_num; ///< current frame number (not used for decoding)
217 GetBitContext gb; ///< bitstream reader context
218 int buf_bit_size; ///< buffer size in bits
219 uint8_t drc_gain; ///< gain for the DRC tool
220 int8_t skip_frame; ///< skip output step
221 int8_t parsed_all_subframes; ///< all subframes decoded?
222 uint8_t skip_packets; ///< packets to skip to find next packet in a stream (XMA1/2)
224 /* subframe/block decode state */
225 int16_t subframe_len; ///< current subframe length
226 int8_t nb_channels; ///< number of channels in stream (XMA1/2)
227 int8_t channels_for_cur_subframe; ///< number of channels that contain the subframe
228 int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS];
229 int8_t num_bands; ///< number of scale factor bands
230 int8_t transmit_num_vec_coeffs; ///< number of vector coded coefficients is part of the bitstream
231 int16_t* cur_sfb_offsets; ///< sfb offsets for the current block
232 uint8_t table_idx; ///< index for the num_sfb, sfb_offsets, sf_offsets and subwoofer_cutoffs tables
233 int8_t esc_len; ///< length of escaped coefficients
235 uint8_t num_chgroups; ///< number of channel groups
236 WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS]; ///< channel group information
238 WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS]; ///< per channel data
241 typedef struct XMADecodeCtx {
242 WMAProDecodeCtx xma[XMA_MAX_STREAMS];
243 AVFrame *frames[XMA_MAX_STREAMS];
246 float samples[XMA_MAX_CHANNELS][512 * 64];
247 int offset[XMA_MAX_STREAMS];
248 int start_channel[XMA_MAX_STREAMS];
252 *@brief helper function to print the most important members of the context
255 static av_cold void dump_context(WMAProDecodeCtx *s)
257 #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
258 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %"PRIx32"\n", a, b);
260 PRINT("ed sample bit depth", s->bits_per_sample);
261 PRINT_HEX("ed decode flags", s->decode_flags);
262 PRINT("samples per frame", s->samples_per_frame);
263 PRINT("log2 frame size", s->log2_frame_size);
264 PRINT("max num subframes", s->max_num_subframes);
265 PRINT("len prefix", s->len_prefix);
266 PRINT("num channels", s->nb_channels);
270 *@brief Uninitialize the decoder and free all resources.
271 *@param avctx codec context
272 *@return 0 on success, < 0 otherwise
274 static av_cold int decode_end(WMAProDecodeCtx *s)
280 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
281 ff_mdct_end(&s->mdct_ctx[i]);
286 static av_cold int wmapro_decode_end(AVCodecContext *avctx)
288 WMAProDecodeCtx *s = avctx->priv_data;
295 static av_cold int get_rate(AVCodecContext *avctx)
297 if (avctx->codec_id != AV_CODEC_ID_WMAPRO) { // XXX: is this really only for XMA?
298 if (avctx->sample_rate > 44100)
300 else if (avctx->sample_rate > 32000)
302 else if (avctx->sample_rate > 24000)
307 return avctx->sample_rate;
311 *@brief Initialize the decoder.
312 *@param avctx codec context
313 *@return 0 on success, -1 otherwise
315 static av_cold int decode_init(WMAProDecodeCtx *s, AVCodecContext *avctx, int num_stream)
317 uint8_t *edata_ptr = avctx->extradata;
318 unsigned int channel_mask;
320 int log2_max_num_subframes;
321 int num_possible_block_sizes;
323 if (avctx->codec_id == AV_CODEC_ID_XMA1 || avctx->codec_id == AV_CODEC_ID_XMA2)
324 avctx->block_align = 2048;
326 if (!avctx->block_align) {
327 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
328 return AVERROR(EINVAL);
333 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
335 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
337 /** dump the extradata */
338 av_log(avctx, AV_LOG_DEBUG, "extradata:\n");
339 for (i = 0; i < avctx->extradata_size; i++)
340 av_log(avctx, AV_LOG_DEBUG, "[%x] ", avctx->extradata[i]);
341 av_log(avctx, AV_LOG_DEBUG, "\n");
343 if (avctx->codec_id == AV_CODEC_ID_XMA2 && avctx->extradata_size == 34) { /* XMA2WAVEFORMATEX */
344 s->decode_flags = 0x10d6;
345 s->bits_per_sample = 16;
346 channel_mask = 0; //AV_RL32(edata_ptr+2); /* not always in expected order */
347 if ((num_stream+1) * XMA_MAX_CHANNELS_STREAM > avctx->channels) /* stream config is 2ch + 2ch + ... + 1/2ch */
351 } else if (avctx->codec_id == AV_CODEC_ID_XMA2) { /* XMA2WAVEFORMAT */
352 s->decode_flags = 0x10d6;
353 s->bits_per_sample = 16;
354 channel_mask = 0; /* would need to aggregate from all streams */
355 s->nb_channels = edata_ptr[32 + ((edata_ptr[0]==3)?0:8) + 4*num_stream + 0]; /* nth stream config */
356 } else if (avctx->codec_id == AV_CODEC_ID_XMA1) { /* XMAWAVEFORMAT */
357 s->decode_flags = 0x10d6;
358 s->bits_per_sample = 16;
359 channel_mask = 0; /* would need to aggregate from all streams */
360 s->nb_channels = edata_ptr[8 + 20*num_stream + 17]; /* nth stream config */
361 } else if (avctx->codec_id == AV_CODEC_ID_WMAPRO && avctx->extradata_size >= 18) {
362 s->decode_flags = AV_RL16(edata_ptr+14);
363 channel_mask = AV_RL32(edata_ptr+2);
364 s->bits_per_sample = AV_RL16(edata_ptr);
365 s->nb_channels = avctx->channels;
367 if (s->bits_per_sample > 32 || s->bits_per_sample < 1) {
368 avpriv_request_sample(avctx, "bits per sample is %d", s->bits_per_sample);
369 return AVERROR_PATCHWELCOME;
372 avpriv_request_sample(avctx, "Unknown extradata size");
373 return AVERROR_PATCHWELCOME;
377 s->log2_frame_size = av_log2(avctx->block_align) + 4;
378 if (s->log2_frame_size > 25) {
379 avpriv_request_sample(avctx, "Large block align");
380 return AVERROR_PATCHWELCOME;
384 if (avctx->codec_id != AV_CODEC_ID_WMAPRO)
387 s->skip_frame = 1; /* skip first frame */
390 s->len_prefix = (s->decode_flags & 0x40);
393 if (avctx->codec_id == AV_CODEC_ID_WMAPRO) {
394 bits = ff_wma_get_frame_len_bits(avctx->sample_rate, 3, s->decode_flags);
395 if (bits > WMAPRO_BLOCK_MAX_BITS) {
396 avpriv_request_sample(avctx, "14-bit block sizes");
397 return AVERROR_PATCHWELCOME;
399 s->samples_per_frame = 1 << bits;
401 s->samples_per_frame = 512;
405 log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
406 s->max_num_subframes = 1 << log2_max_num_subframes;
407 if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
408 s->max_subframe_len_bit = 1;
409 s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
411 num_possible_block_sizes = log2_max_num_subframes + 1;
412 s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
413 s->dynamic_range_compression = (s->decode_flags & 0x80);
415 if (s->max_num_subframes > MAX_SUBFRAMES) {
416 av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %"PRId8"\n",
417 s->max_num_subframes);
418 return AVERROR_INVALIDDATA;
421 if (s->min_samples_per_subframe < WMAPRO_BLOCK_MIN_SIZE) {
422 av_log(avctx, AV_LOG_ERROR, "min_samples_per_subframe of %d too small\n",
423 s->min_samples_per_subframe);
424 return AVERROR_INVALIDDATA;
427 if (s->avctx->sample_rate <= 0) {
428 av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
429 return AVERROR_INVALIDDATA;
432 if (s->nb_channels <= 0) {
433 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n",
435 return AVERROR_INVALIDDATA;
436 } else if (avctx->codec_id != AV_CODEC_ID_WMAPRO && s->nb_channels > XMA_MAX_CHANNELS_STREAM) {
437 av_log(avctx, AV_LOG_ERROR, "invalid number of channels per XMA stream %d\n",
439 return AVERROR_INVALIDDATA;
440 } else if (s->nb_channels > WMAPRO_MAX_CHANNELS) {
441 avpriv_request_sample(avctx,
442 "More than %d channels", WMAPRO_MAX_CHANNELS);
443 return AVERROR_PATCHWELCOME;
446 /** init previous block len */
447 for (i = 0; i < s->nb_channels; i++)
448 s->channel[i].prev_block_len = s->samples_per_frame;
450 /** extract lfe channel position */
453 if (channel_mask & 8) {
455 for (mask = 1; mask < 16; mask <<= 1) {
456 if (channel_mask & mask)
461 INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
462 scale_huffbits, 1, 1,
463 scale_huffcodes, 2, 2, 616);
465 INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
466 scale_rl_huffbits, 1, 1,
467 scale_rl_huffcodes, 4, 4, 1406);
469 INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
470 coef0_huffbits, 1, 1,
471 coef0_huffcodes, 4, 4, 2108);
473 INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
474 coef1_huffbits, 1, 1,
475 coef1_huffcodes, 4, 4, 3912);
477 INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
479 vec4_huffcodes, 2, 2, 604);
481 INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
483 vec2_huffcodes, 2, 2, 562);
485 INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
487 vec1_huffcodes, 2, 2, 562);
489 /** calculate number of scale factor bands and their offsets
490 for every possible block size */
491 for (i = 0; i < num_possible_block_sizes; i++) {
492 int subframe_len = s->samples_per_frame >> i;
495 int rate = get_rate(avctx);
497 s->sfb_offsets[i][0] = 0;
499 for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
500 int offset = (subframe_len * 2 * critical_freq[x]) / rate + 2;
502 if (offset > s->sfb_offsets[i][band - 1])
503 s->sfb_offsets[i][band++] = offset;
505 if (offset >= subframe_len)
508 s->sfb_offsets[i][band - 1] = subframe_len;
509 s->num_sfb[i] = band - 1;
510 if (s->num_sfb[i] <= 0) {
511 av_log(avctx, AV_LOG_ERROR, "num_sfb invalid\n");
512 return AVERROR_INVALIDDATA;
517 /** Scale factors can be shared between blocks of different size
518 as every block has a different scale factor band layout.
519 The matrix sf_offsets is needed to find the correct scale factor.
522 for (i = 0; i < num_possible_block_sizes; i++) {
524 for (b = 0; b < s->num_sfb[i]; b++) {
526 int offset = ((s->sfb_offsets[i][b]
527 + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
528 for (x = 0; x < num_possible_block_sizes; x++) {
530 while (s->sfb_offsets[x][v + 1] << x < offset) {
532 av_assert0(v < MAX_BANDS);
534 s->sf_offsets[i][x][b] = v;
539 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
541 return AVERROR(ENOMEM);
543 /** init MDCT, FIXME: only init needed sizes */
544 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
545 ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
546 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
547 / (1 << (s->bits_per_sample - 1)));
549 /** init MDCT windows: simple sine window */
550 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
551 const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
552 ff_init_ff_sine_windows(win_idx);
553 s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
556 /** calculate subwoofer cutoff values */
557 for (i = 0; i < num_possible_block_sizes; i++) {
558 int block_size = s->samples_per_frame >> i;
559 int cutoff = (440*block_size + 3LL * (s->avctx->sample_rate >> 1) - 1)
560 / s->avctx->sample_rate;
561 s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
564 /** calculate sine values for the decorrelation matrix */
565 for (i = 0; i < 33; i++)
566 sin64[i] = sin(i*M_PI / 64.0);
568 if (avctx->debug & FF_DEBUG_BITSTREAM)
571 avctx->channel_layout = channel_mask;
577 *@brief Initialize the decoder.
578 *@param avctx codec context
579 *@return 0 on success, -1 otherwise
581 static av_cold int wmapro_decode_init(AVCodecContext *avctx)
583 WMAProDecodeCtx *s = avctx->priv_data;
585 return decode_init(s, avctx, 0);
589 *@brief Decode the subframe length.
591 *@param offset sample offset in the frame
592 *@return decoded subframe length on success, < 0 in case of an error
594 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
596 int frame_len_shift = 0;
599 /** no need to read from the bitstream when only one length is possible */
600 if (offset == s->samples_per_frame - s->min_samples_per_subframe)
601 return s->min_samples_per_subframe;
603 if (get_bits_left(&s->gb) < 1)
604 return AVERROR_INVALIDDATA;
606 /** 1 bit indicates if the subframe is of maximum length */
607 if (s->max_subframe_len_bit) {
608 if (get_bits1(&s->gb))
609 frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
611 frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
613 subframe_len = s->samples_per_frame >> frame_len_shift;
615 /** sanity check the length */
616 if (subframe_len < s->min_samples_per_subframe ||
617 subframe_len > s->samples_per_frame) {
618 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
620 return AVERROR_INVALIDDATA;
626 *@brief Decode how the data in the frame is split into subframes.
627 * Every WMA frame contains the encoded data for a fixed number of
628 * samples per channel. The data for every channel might be split
629 * into several subframes. This function will reconstruct the list of
630 * subframes for every channel.
632 * If the subframes are not evenly split, the algorithm estimates the
633 * channels with the lowest number of total samples.
634 * Afterwards, for each of these channels a bit is read from the
635 * bitstream that indicates if the channel contains a subframe with the
636 * next subframe size that is going to be read from the bitstream or not.
637 * If a channel contains such a subframe, the subframe size gets added to
638 * the channel's subframe list.
639 * The algorithm repeats these steps until the frame is properly divided
640 * between the individual channels.
643 *@return 0 on success, < 0 in case of an error
645 static int decode_tilehdr(WMAProDecodeCtx *s)
647 uint16_t num_samples[WMAPRO_MAX_CHANNELS] = { 0 };/**< sum of samples for all currently known subframes of a channel */
648 uint8_t contains_subframe[WMAPRO_MAX_CHANNELS]; /**< flag indicating if a channel contains the current subframe */
649 int channels_for_cur_subframe = s->nb_channels; /**< number of channels that contain the current subframe */
650 int fixed_channel_layout = 0; /**< flag indicating that all channels use the same subframe offsets and sizes */
651 int min_channel_len = 0; /**< smallest sum of samples (channels with this length will be processed first) */
654 /* Should never consume more than 3073 bits (256 iterations for the
655 * while loop when always the minimum amount of 128 samples is subtracted
656 * from missing samples in the 8 channel case).
657 * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4)
660 /** reset tiling information */
661 for (c = 0; c < s->nb_channels; c++)
662 s->channel[c].num_subframes = 0;
664 if (s->max_num_subframes == 1 || get_bits1(&s->gb))
665 fixed_channel_layout = 1;
667 /** loop until the frame data is split between the subframes */
671 /** check which channels contain the subframe */
672 for (c = 0; c < s->nb_channels; c++) {
673 if (num_samples[c] == min_channel_len) {
674 if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
675 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
676 contains_subframe[c] = 1;
678 contains_subframe[c] = get_bits1(&s->gb);
680 contains_subframe[c] = 0;
683 /** get subframe length, subframe_len == 0 is not allowed */
684 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
685 return AVERROR_INVALIDDATA;
687 /** add subframes to the individual channels and find new min_channel_len */
688 min_channel_len += subframe_len;
689 for (c = 0; c < s->nb_channels; c++) {
690 WMAProChannelCtx* chan = &s->channel[c];
692 if (contains_subframe[c]) {
693 if (chan->num_subframes >= MAX_SUBFRAMES) {
694 av_log(s->avctx, AV_LOG_ERROR,
695 "broken frame: num subframes > 31\n");
696 return AVERROR_INVALIDDATA;
698 chan->subframe_len[chan->num_subframes] = subframe_len;
699 num_samples[c] += subframe_len;
700 ++chan->num_subframes;
701 if (num_samples[c] > s->samples_per_frame) {
702 av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
703 "channel len > samples_per_frame\n");
704 return AVERROR_INVALIDDATA;
706 } else if (num_samples[c] <= min_channel_len) {
707 if (num_samples[c] < min_channel_len) {
708 channels_for_cur_subframe = 0;
709 min_channel_len = num_samples[c];
711 ++channels_for_cur_subframe;
714 } while (min_channel_len < s->samples_per_frame);
716 for (c = 0; c < s->nb_channels; c++) {
719 for (i = 0; i < s->channel[c].num_subframes; i++) {
720 ff_dlog(s->avctx, "frame[%"PRIu32"] channel[%i] subframe[%i]"
721 " len %i\n", s->frame_num, c, i,
722 s->channel[c].subframe_len[i]);
723 s->channel[c].subframe_offset[i] = offset;
724 offset += s->channel[c].subframe_len[i];
732 *@brief Calculate a decorrelation matrix from the bitstream parameters.
733 *@param s codec context
734 *@param chgroup channel group for which the matrix needs to be calculated
736 static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
737 WMAProChannelGrp *chgroup)
741 int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
742 memset(chgroup->decorrelation_matrix, 0, s->nb_channels *
743 s->nb_channels * sizeof(*chgroup->decorrelation_matrix));
745 for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
746 rotation_offset[i] = get_bits(&s->gb, 6);
748 for (i = 0; i < chgroup->num_channels; i++)
749 chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
750 get_bits1(&s->gb) ? 1.0 : -1.0;
752 for (i = 1; i < chgroup->num_channels; i++) {
754 for (x = 0; x < i; x++) {
756 for (y = 0; y < i + 1; y++) {
757 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
758 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
759 int n = rotation_offset[offset + x];
765 cosv = sin64[32 - n];
767 sinv = sin64[64 - n];
768 cosv = -sin64[n - 32];
771 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
772 (v1 * sinv) - (v2 * cosv);
773 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
774 (v1 * cosv) + (v2 * sinv);
782 *@brief Decode channel transformation parameters
783 *@param s codec context
784 *@return >= 0 in case of success, < 0 in case of bitstream errors
786 static int decode_channel_transform(WMAProDecodeCtx* s)
789 /* should never consume more than 1921 bits for the 8 channel case
790 * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS
791 * + MAX_CHANNELS + MAX_BANDS + 1)
794 /** in the one channel case channel transforms are pointless */
796 if (s->nb_channels > 1) {
797 int remaining_channels = s->channels_for_cur_subframe;
799 if (get_bits1(&s->gb)) {
800 avpriv_request_sample(s->avctx,
801 "Channel transform bit");
802 return AVERROR_PATCHWELCOME;
805 for (s->num_chgroups = 0; remaining_channels &&
806 s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
807 WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
808 float** channel_data = chgroup->channel_data;
809 chgroup->num_channels = 0;
810 chgroup->transform = 0;
812 /** decode channel mask */
813 if (remaining_channels > 2) {
814 for (i = 0; i < s->channels_for_cur_subframe; i++) {
815 int channel_idx = s->channel_indexes_for_cur_subframe[i];
816 if (!s->channel[channel_idx].grouped
817 && get_bits1(&s->gb)) {
818 ++chgroup->num_channels;
819 s->channel[channel_idx].grouped = 1;
820 *channel_data++ = s->channel[channel_idx].coeffs;
824 chgroup->num_channels = remaining_channels;
825 for (i = 0; i < s->channels_for_cur_subframe; i++) {
826 int channel_idx = s->channel_indexes_for_cur_subframe[i];
827 if (!s->channel[channel_idx].grouped)
828 *channel_data++ = s->channel[channel_idx].coeffs;
829 s->channel[channel_idx].grouped = 1;
833 /** decode transform type */
834 if (chgroup->num_channels == 2) {
835 if (get_bits1(&s->gb)) {
836 if (get_bits1(&s->gb)) {
837 avpriv_request_sample(s->avctx,
838 "Unknown channel transform type");
839 return AVERROR_PATCHWELCOME;
842 chgroup->transform = 1;
843 if (s->nb_channels == 2) {
844 chgroup->decorrelation_matrix[0] = 1.0;
845 chgroup->decorrelation_matrix[1] = -1.0;
846 chgroup->decorrelation_matrix[2] = 1.0;
847 chgroup->decorrelation_matrix[3] = 1.0;
850 chgroup->decorrelation_matrix[0] = 0.70703125;
851 chgroup->decorrelation_matrix[1] = -0.70703125;
852 chgroup->decorrelation_matrix[2] = 0.70703125;
853 chgroup->decorrelation_matrix[3] = 0.70703125;
856 } else if (chgroup->num_channels > 2) {
857 if (get_bits1(&s->gb)) {
858 chgroup->transform = 1;
859 if (get_bits1(&s->gb)) {
860 decode_decorrelation_matrix(s, chgroup);
862 /** FIXME: more than 6 coupled channels not supported */
863 if (chgroup->num_channels > 6) {
864 avpriv_request_sample(s->avctx,
865 "Coupled channels > 6");
867 memcpy(chgroup->decorrelation_matrix,
868 default_decorrelation[chgroup->num_channels],
869 chgroup->num_channels * chgroup->num_channels *
870 sizeof(*chgroup->decorrelation_matrix));
876 /** decode transform on / off */
877 if (chgroup->transform) {
878 if (!get_bits1(&s->gb)) {
880 /** transform can be enabled for individual bands */
881 for (i = 0; i < s->num_bands; i++) {
882 chgroup->transform_band[i] = get_bits1(&s->gb);
885 memset(chgroup->transform_band, 1, s->num_bands);
888 remaining_channels -= chgroup->num_channels;
895 *@brief Extract the coefficients from the bitstream.
896 *@param s codec context
897 *@param c current channel number
898 *@return 0 on success, < 0 in case of bitstream errors
900 static int decode_coeffs(WMAProDecodeCtx *s, int c)
902 /* Integers 0..15 as single-precision floats. The table saves a
903 costly int to float conversion, and storing the values as
904 integers allows fast sign-flipping. */
905 static const uint32_t fval_tab[16] = {
906 0x00000000, 0x3f800000, 0x40000000, 0x40400000,
907 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
908 0x41000000, 0x41100000, 0x41200000, 0x41300000,
909 0x41400000, 0x41500000, 0x41600000, 0x41700000,
913 WMAProChannelCtx* ci = &s->channel[c];
920 ff_dlog(s->avctx, "decode coefficients for channel %i\n", c);
922 vlctable = get_bits1(&s->gb);
923 vlc = &coef_vlc[vlctable];
933 /** decode vector coefficients (consumes up to 167 bits per iteration for
934 4 vector coded large values) */
935 while ((s->transmit_num_vec_coeffs || !rl_mode) &&
936 (cur_coeff + 3 < ci->num_vec_coeffs)) {
941 idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
943 if (idx == HUFF_VEC4_SIZE - 1) {
944 for (i = 0; i < 4; i += 2) {
945 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
946 if (idx == HUFF_VEC2_SIZE - 1) {
948 v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
949 if (v0 == HUFF_VEC1_SIZE - 1)
950 v0 += ff_wma_get_large_val(&s->gb);
951 v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
952 if (v1 == HUFF_VEC1_SIZE - 1)
953 v1 += ff_wma_get_large_val(&s->gb);
954 vals[i ] = av_float2int(v0);
955 vals[i+1] = av_float2int(v1);
957 vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
958 vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
962 vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
963 vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
964 vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
965 vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
969 for (i = 0; i < 4; i++) {
971 uint32_t sign = get_bits1(&s->gb) - 1;
972 AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
975 ci->coeffs[cur_coeff] = 0;
976 /** switch to run level mode when subframe_len / 128 zeros
977 were found in a row */
978 rl_mode |= (++num_zeros > s->subframe_len >> 8);
984 /** decode run level coded coefficients */
985 if (cur_coeff < s->subframe_len) {
986 memset(&ci->coeffs[cur_coeff], 0,
987 sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
988 if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
989 level, run, 1, ci->coeffs,
990 cur_coeff, s->subframe_len,
991 s->subframe_len, s->esc_len, 0))
992 return AVERROR_INVALIDDATA;
999 *@brief Extract scale factors from the bitstream.
1000 *@param s codec context
1001 *@return 0 on success, < 0 in case of bitstream errors
1003 static int decode_scale_factors(WMAProDecodeCtx* s)
1007 /** should never consume more than 5344 bits
1008 * MAX_CHANNELS * (1 + MAX_BANDS * 23)
1011 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1012 int c = s->channel_indexes_for_cur_subframe[i];
1015 s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
1016 sf_end = s->channel[c].scale_factors + s->num_bands;
1018 /** resample scale factors for the new block size
1019 * as the scale factors might need to be resampled several times
1020 * before some new values are transmitted, a backup of the last
1021 * transmitted scale factors is kept in saved_scale_factors
1023 if (s->channel[c].reuse_sf) {
1024 const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
1026 for (b = 0; b < s->num_bands; b++)
1027 s->channel[c].scale_factors[b] =
1028 s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
1031 if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
1033 if (!s->channel[c].reuse_sf) {
1035 /** decode DPCM coded scale factors */
1036 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
1037 val = 45 / s->channel[c].scale_factor_step;
1038 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
1039 val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
1044 /** run level decode differences to the resampled factors */
1045 for (i = 0; i < s->num_bands; i++) {
1051 idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
1054 uint32_t code = get_bits(&s->gb, 14);
1056 sign = (code & 1) - 1;
1057 skip = (code & 0x3f) >> 1;
1058 } else if (idx == 1) {
1061 skip = scale_rl_run[idx];
1062 val = scale_rl_level[idx];
1063 sign = get_bits1(&s->gb)-1;
1067 if (i >= s->num_bands) {
1068 av_log(s->avctx, AV_LOG_ERROR,
1069 "invalid scale factor coding\n");
1070 return AVERROR_INVALIDDATA;
1072 s->channel[c].scale_factors[i] += (val ^ sign) - sign;
1076 s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
1077 s->channel[c].table_idx = s->table_idx;
1078 s->channel[c].reuse_sf = 1;
1081 /** calculate new scale factor maximum */
1082 s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
1083 for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
1084 s->channel[c].max_scale_factor =
1085 FFMAX(s->channel[c].max_scale_factor, *sf);
1093 *@brief Reconstruct the individual channel data.
1094 *@param s codec context
1096 static void inverse_channel_transform(WMAProDecodeCtx *s)
1100 for (i = 0; i < s->num_chgroups; i++) {
1101 if (s->chgroup[i].transform) {
1102 float data[WMAPRO_MAX_CHANNELS];
1103 const int num_channels = s->chgroup[i].num_channels;
1104 float** ch_data = s->chgroup[i].channel_data;
1105 float** ch_end = ch_data + num_channels;
1106 const int8_t* tb = s->chgroup[i].transform_band;
1109 /** multichannel decorrelation */
1110 for (sfb = s->cur_sfb_offsets;
1111 sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
1114 /** multiply values with the decorrelation_matrix */
1115 for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
1116 const float* mat = s->chgroup[i].decorrelation_matrix;
1117 const float* data_end = data + num_channels;
1118 float* data_ptr = data;
1121 for (ch = ch_data; ch < ch_end; ch++)
1122 *data_ptr++ = (*ch)[y];
1124 for (ch = ch_data; ch < ch_end; ch++) {
1127 while (data_ptr < data_end)
1128 sum += *data_ptr++ * *mat++;
1133 } else if (s->nb_channels == 2) {
1134 int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
1135 s->fdsp->vector_fmul_scalar(ch_data[0] + sfb[0],
1136 ch_data[0] + sfb[0],
1138 s->fdsp->vector_fmul_scalar(ch_data[1] + sfb[0],
1139 ch_data[1] + sfb[0],
1148 *@brief Apply sine window and reconstruct the output buffer.
1149 *@param s codec context
1151 static void wmapro_window(WMAProDecodeCtx *s)
1154 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1155 int c = s->channel_indexes_for_cur_subframe[i];
1156 const float* window;
1157 int winlen = s->channel[c].prev_block_len;
1158 float* start = s->channel[c].coeffs - (winlen >> 1);
1160 if (s->subframe_len < winlen) {
1161 start += (winlen - s->subframe_len) >> 1;
1162 winlen = s->subframe_len;
1165 window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
1169 s->fdsp->vector_fmul_window(start, start, start + winlen,
1172 s->channel[c].prev_block_len = s->subframe_len;
1177 *@brief Decode a single subframe (block).
1178 *@param s codec context
1179 *@return 0 on success, < 0 when decoding failed
1181 static int decode_subframe(WMAProDecodeCtx *s)
1183 int offset = s->samples_per_frame;
1184 int subframe_len = s->samples_per_frame;
1186 int total_samples = s->samples_per_frame * s->nb_channels;
1187 int transmit_coeffs = 0;
1188 int cur_subwoofer_cutoff;
1190 s->subframe_offset = get_bits_count(&s->gb);
1192 /** reset channel context and find the next block offset and size
1193 == the next block of the channel with the smallest number of
1196 for (i = 0; i < s->nb_channels; i++) {
1197 s->channel[i].grouped = 0;
1198 if (offset > s->channel[i].decoded_samples) {
1199 offset = s->channel[i].decoded_samples;
1201 s->channel[i].subframe_len[s->channel[i].cur_subframe];
1206 "processing subframe with offset %i len %i\n", offset, subframe_len);
1208 /** get a list of all channels that contain the estimated block */
1209 s->channels_for_cur_subframe = 0;
1210 for (i = 0; i < s->nb_channels; i++) {
1211 const int cur_subframe = s->channel[i].cur_subframe;
1212 /** subtract already processed samples */
1213 total_samples -= s->channel[i].decoded_samples;
1215 /** and count if there are multiple subframes that match our profile */
1216 if (offset == s->channel[i].decoded_samples &&
1217 subframe_len == s->channel[i].subframe_len[cur_subframe]) {
1218 total_samples -= s->channel[i].subframe_len[cur_subframe];
1219 s->channel[i].decoded_samples +=
1220 s->channel[i].subframe_len[cur_subframe];
1221 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
1222 ++s->channels_for_cur_subframe;
1226 /** check if the frame will be complete after processing the
1229 s->parsed_all_subframes = 1;
1232 ff_dlog(s->avctx, "subframe is part of %i channels\n",
1233 s->channels_for_cur_subframe);
1235 /** calculate number of scale factor bands and their offsets */
1236 s->table_idx = av_log2(s->samples_per_frame/subframe_len);
1237 s->num_bands = s->num_sfb[s->table_idx];
1238 s->cur_sfb_offsets = s->sfb_offsets[s->table_idx];
1239 cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
1241 /** configure the decoder for the current subframe */
1242 offset += s->samples_per_frame >> 1;
1244 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1245 int c = s->channel_indexes_for_cur_subframe[i];
1247 s->channel[c].coeffs = &s->channel[c].out[offset];
1250 s->subframe_len = subframe_len;
1251 s->esc_len = av_log2(s->subframe_len - 1) + 1;
1253 /** skip extended header if any */
1254 if (get_bits1(&s->gb)) {
1256 if (!(num_fill_bits = get_bits(&s->gb, 2))) {
1257 int len = get_bits(&s->gb, 4);
1258 num_fill_bits = get_bitsz(&s->gb, len) + 1;
1261 if (num_fill_bits >= 0) {
1262 if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
1263 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
1264 return AVERROR_INVALIDDATA;
1267 skip_bits_long(&s->gb, num_fill_bits);
1271 /** no idea for what the following bit is used */
1272 if (get_bits1(&s->gb)) {
1273 avpriv_request_sample(s->avctx, "Reserved bit");
1274 return AVERROR_PATCHWELCOME;
1278 if (decode_channel_transform(s) < 0)
1279 return AVERROR_INVALIDDATA;
1282 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1283 int c = s->channel_indexes_for_cur_subframe[i];
1284 if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
1285 transmit_coeffs = 1;
1288 av_assert0(s->subframe_len <= WMAPRO_BLOCK_MAX_SIZE);
1289 if (transmit_coeffs) {
1291 int quant_step = 90 * s->bits_per_sample >> 4;
1293 /** decode number of vector coded coefficients */
1294 if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
1295 int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
1296 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1297 int c = s->channel_indexes_for_cur_subframe[i];
1298 int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
1299 if (num_vec_coeffs > s->subframe_len) {
1300 av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
1301 return AVERROR_INVALIDDATA;
1303 av_assert0(num_vec_coeffs + offset <= FF_ARRAY_ELEMS(s->channel[c].out));
1304 s->channel[c].num_vec_coeffs = num_vec_coeffs;
1307 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1308 int c = s->channel_indexes_for_cur_subframe[i];
1309 s->channel[c].num_vec_coeffs = s->subframe_len;
1312 /** decode quantization step */
1313 step = get_sbits(&s->gb, 6);
1315 if (step == -32 || step == 31) {
1316 const int sign = (step == 31) - 1;
1318 while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
1319 (step = get_bits(&s->gb, 5)) == 31) {
1322 quant_step += ((quant + step) ^ sign) - sign;
1324 if (quant_step < 0) {
1325 av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
1328 /** decode quantization step modifiers for every channel */
1330 if (s->channels_for_cur_subframe == 1) {
1331 s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
1333 int modifier_len = get_bits(&s->gb, 3);
1334 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1335 int c = s->channel_indexes_for_cur_subframe[i];
1336 s->channel[c].quant_step = quant_step;
1337 if (get_bits1(&s->gb)) {
1339 s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
1341 ++s->channel[c].quant_step;
1346 /** decode scale factors */
1347 if (decode_scale_factors(s) < 0)
1348 return AVERROR_INVALIDDATA;
1351 ff_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
1352 get_bits_count(&s->gb) - s->subframe_offset);
1354 /** parse coefficients */
1355 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1356 int c = s->channel_indexes_for_cur_subframe[i];
1357 if (s->channel[c].transmit_coefs &&
1358 get_bits_count(&s->gb) < s->num_saved_bits) {
1359 decode_coeffs(s, c);
1361 memset(s->channel[c].coeffs, 0,
1362 sizeof(*s->channel[c].coeffs) * subframe_len);
1365 ff_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
1366 get_bits_count(&s->gb) - s->subframe_offset);
1368 if (transmit_coeffs) {
1369 FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
1370 /** reconstruct the per channel data */
1371 inverse_channel_transform(s);
1372 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1373 int c = s->channel_indexes_for_cur_subframe[i];
1374 const int* sf = s->channel[c].scale_factors;
1377 if (c == s->lfe_channel)
1378 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
1379 (subframe_len - cur_subwoofer_cutoff));
1381 /** inverse quantization and rescaling */
1382 for (b = 0; b < s->num_bands; b++) {
1383 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
1384 const int exp = s->channel[c].quant_step -
1385 (s->channel[c].max_scale_factor - *sf++) *
1386 s->channel[c].scale_factor_step;
1387 const float quant = ff_exp10(exp / 20.0);
1388 int start = s->cur_sfb_offsets[b];
1389 s->fdsp->vector_fmul_scalar(s->tmp + start,
1390 s->channel[c].coeffs + start,
1391 quant, end - start);
1394 /** apply imdct (imdct_half == DCTIV with reverse) */
1395 mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
1399 /** window and overlapp-add */
1402 /** handled one subframe */
1403 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1404 int c = s->channel_indexes_for_cur_subframe[i];
1405 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
1406 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
1407 return AVERROR_INVALIDDATA;
1409 ++s->channel[c].cur_subframe;
1416 *@brief Decode one WMA frame.
1417 *@param s codec context
1418 *@return 0 if the trailer bit indicates that this is the last frame,
1419 * 1 if there are additional frames
1421 static int decode_frame(WMAProDecodeCtx *s, AVFrame *frame, int *got_frame_ptr)
1423 GetBitContext* gb = &s->gb;
1424 int more_frames = 0;
1428 /** get frame length */
1430 len = get_bits(gb, s->log2_frame_size);
1432 ff_dlog(s->avctx, "decoding frame with length %x\n", len);
1434 /** decode tile information */
1435 if (decode_tilehdr(s)) {
1440 /** read postproc transform */
1441 if (s->nb_channels > 1 && get_bits1(gb)) {
1442 if (get_bits1(gb)) {
1443 for (i = 0; i < s->nb_channels * s->nb_channels; i++)
1448 /** read drc info */
1449 if (s->dynamic_range_compression) {
1450 s->drc_gain = get_bits(gb, 8);
1451 ff_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
1454 /** no idea what these are for, might be the number of samples
1455 that need to be skipped at the beginning or end of a stream */
1456 if (get_bits1(gb)) {
1459 /** usually true for the first frame */
1460 if (get_bits1(gb)) {
1461 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1462 ff_dlog(s->avctx, "start skip: %i\n", skip);
1465 /** sometimes true for the last frame */
1466 if (get_bits1(gb)) {
1467 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
1468 ff_dlog(s->avctx, "end skip: %i\n", skip);
1473 ff_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
1474 get_bits_count(gb) - s->frame_offset);
1476 /** reset subframe states */
1477 s->parsed_all_subframes = 0;
1478 for (i = 0; i < s->nb_channels; i++) {
1479 s->channel[i].decoded_samples = 0;
1480 s->channel[i].cur_subframe = 0;
1481 s->channel[i].reuse_sf = 0;
1484 /** decode all subframes */
1485 while (!s->parsed_all_subframes) {
1486 if (decode_subframe(s) < 0) {
1492 /** copy samples to the output buffer */
1493 for (i = 0; i < s->nb_channels; i++)
1494 memcpy(frame->extended_data[i], s->channel[i].out,
1495 s->samples_per_frame * sizeof(*s->channel[i].out));
1497 for (i = 0; i < s->nb_channels; i++) {
1498 /** reuse second half of the IMDCT output for the next frame */
1499 memcpy(&s->channel[i].out[0],
1500 &s->channel[i].out[s->samples_per_frame],
1501 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
1504 if (s->skip_frame) {
1507 av_frame_unref(frame);
1512 if (s->len_prefix) {
1513 if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
1514 /** FIXME: not sure if this is always an error */
1515 av_log(s->avctx, AV_LOG_ERROR,
1516 "frame[%"PRIu32"] would have to skip %i bits\n",
1518 len - (get_bits_count(gb) - s->frame_offset) - 1);
1523 /** skip the rest of the frame data */
1524 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
1526 while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
1530 /** decode trailer bit */
1531 more_frames = get_bits1(gb);
1538 *@brief Calculate remaining input buffer length.
1539 *@param s codec context
1540 *@param gb bitstream reader context
1541 *@return remaining size in bits
1543 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
1545 return s->buf_bit_size - get_bits_count(gb);
1549 *@brief Fill the bit reservoir with a (partial) frame.
1550 *@param s codec context
1551 *@param gb bitstream reader context
1552 *@param len length of the partial frame
1553 *@param append decides whether to reset the buffer or not
1555 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
1560 /** when the frame data does not need to be concatenated, the input buffer
1561 is reset and additional bits from the previous frame are copied
1562 and skipped later so that a fast byte copy is possible */
1565 s->frame_offset = get_bits_count(gb) & 7;
1566 s->num_saved_bits = s->frame_offset;
1567 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
1570 buflen = (put_bits_count(&s->pb) + len + 8) >> 3;
1572 if (len <= 0 || buflen > MAX_FRAMESIZE) {
1573 avpriv_request_sample(s->avctx, "Too small input buffer");
1578 av_assert0(len <= put_bits_left(&s->pb));
1580 s->num_saved_bits += len;
1582 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
1585 int align = 8 - (get_bits_count(gb) & 7);
1586 align = FFMIN(align, len);
1587 put_bits(&s->pb, align, get_bits(gb, align));
1589 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
1591 skip_bits_long(gb, len);
1594 PutBitContext tmp = s->pb;
1595 flush_put_bits(&tmp);
1598 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
1599 skip_bits(&s->gb, s->frame_offset);
1602 static int decode_packet(AVCodecContext *avctx, WMAProDecodeCtx *s,
1603 void *data, int *got_frame_ptr, AVPacket *avpkt)
1605 GetBitContext* gb = &s->pgb;
1606 const uint8_t* buf = avpkt->data;
1607 int buf_size = avpkt->size;
1608 int num_bits_prev_frame;
1609 int packet_sequence_number;
1614 AVFrame *frame = data;
1617 /** Must output remaining samples after stream end. WMAPRO 5.1 created
1618 * by XWMA encoder don't though (maybe only 1/2ch streams need it). */
1623 /** clean output buffer and copy last IMDCT samples */
1624 for (i = 0; i < s->nb_channels; i++) {
1625 memset(frame->extended_data[i], 0,
1626 s->samples_per_frame * sizeof(*s->channel[i].out));
1628 memcpy(frame->extended_data[i], s->channel[i].out,
1629 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
1632 /* TODO: XMA should output 128 samples only (instead of 512) and WMAPRO
1633 * maybe 768 (with 2048), XMA needs changes in multi-stream handling though. */
1640 else if (s->packet_done || s->packet_loss) {
1643 /** sanity check for the buffer length */
1644 if (avctx->codec_id == AV_CODEC_ID_WMAPRO && buf_size < avctx->block_align) {
1645 av_log(avctx, AV_LOG_ERROR, "Input packet too small (%d < %d)\n",
1646 buf_size, avctx->block_align);
1647 return AVERROR_INVALIDDATA;
1650 if (avctx->codec_id == AV_CODEC_ID_WMAPRO) {
1651 s->next_packet_start = buf_size - avctx->block_align;
1652 buf_size = avctx->block_align;
1654 s->next_packet_start = buf_size - FFMIN(buf_size, avctx->block_align);
1655 buf_size = FFMIN(buf_size, avctx->block_align);
1657 s->buf_bit_size = buf_size << 3;
1659 /** parse packet header */
1660 init_get_bits(gb, buf, s->buf_bit_size);
1661 if (avctx->codec_id != AV_CODEC_ID_XMA2) {
1662 packet_sequence_number = get_bits(gb, 4);
1665 int num_frames = get_bits(gb, 6);
1666 ff_dlog(avctx, "packet[%d]: number of frames %d\n", avctx->frame_number, num_frames);
1667 packet_sequence_number = 0;
1670 /** get number of bits that need to be added to the previous frame */
1671 num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
1672 if (avctx->codec_id != AV_CODEC_ID_WMAPRO) {
1674 s->skip_packets = get_bits(gb, 8);
1675 ff_dlog(avctx, "packet[%d]: skip packets %d\n", avctx->frame_number, s->skip_packets);
1678 ff_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
1679 num_bits_prev_frame);
1681 /** check for packet loss */
1682 if (avctx->codec_id == AV_CODEC_ID_WMAPRO && !s->packet_loss &&
1683 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
1685 av_log(avctx, AV_LOG_ERROR,
1686 "Packet loss detected! seq %"PRIx8" vs %x\n",
1687 s->packet_sequence_number, packet_sequence_number);
1689 s->packet_sequence_number = packet_sequence_number;
1691 if (num_bits_prev_frame > 0) {
1692 int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
1693 if (num_bits_prev_frame >= remaining_packet_bits) {
1694 num_bits_prev_frame = remaining_packet_bits;
1698 /** append the previous frame data to the remaining data from the
1699 previous packet to create a full frame */
1700 save_bits(s, gb, num_bits_prev_frame, 1);
1701 ff_dlog(avctx, "accumulated %x bits of frame data\n",
1702 s->num_saved_bits - s->frame_offset);
1704 /** decode the cross packet frame if it is valid */
1705 if (!s->packet_loss)
1706 decode_frame(s, data, got_frame_ptr);
1707 } else if (s->num_saved_bits - s->frame_offset) {
1708 ff_dlog(avctx, "ignoring %x previously saved bits\n",
1709 s->num_saved_bits - s->frame_offset);
1712 if (s->packet_loss) {
1713 /** reset number of saved bits so that the decoder
1714 does not start to decode incomplete frames in the
1715 s->len_prefix == 0 case */
1716 s->num_saved_bits = 0;
1721 s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
1722 init_get_bits(gb, avpkt->data, s->buf_bit_size);
1723 skip_bits(gb, s->packet_offset);
1724 if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
1725 (frame_size = show_bits(gb, s->log2_frame_size)) &&
1726 frame_size <= remaining_bits(s, gb)) {
1727 save_bits(s, gb, frame_size, 0);
1728 if (!s->packet_loss)
1729 s->packet_done = !decode_frame(s, data, got_frame_ptr);
1730 } else if (!s->len_prefix
1731 && s->num_saved_bits > get_bits_count(&s->gb)) {
1732 /** when the frames do not have a length prefix, we don't know
1733 the compressed length of the individual frames
1734 however, we know what part of a new packet belongs to the
1736 therefore we save the incoming packet first, then we append
1737 the "previous frame" data from the next packet so that
1738 we get a buffer that only contains full frames */
1739 s->packet_done = !decode_frame(s, data, got_frame_ptr);
1745 if (remaining_bits(s, gb) < 0) {
1746 av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -remaining_bits(s, gb));
1750 if (s->packet_done && !s->packet_loss &&
1751 remaining_bits(s, gb) > 0) {
1752 /** save the rest of the data so that it can be decoded
1753 with the next packet */
1754 save_bits(s, gb, remaining_bits(s, gb), 0);
1757 s->packet_offset = get_bits_count(gb) & 7;
1759 return AVERROR_INVALIDDATA;
1761 return get_bits_count(gb) >> 3;
1765 *@brief Decode a single WMA packet.
1766 *@param avctx codec context
1767 *@param data the output buffer
1768 *@param avpkt input packet
1769 *@return number of bytes that were read from the input buffer
1771 static int wmapro_decode_packet(AVCodecContext *avctx, void *data,
1772 int *got_frame_ptr, AVPacket *avpkt)
1774 WMAProDecodeCtx *s = avctx->priv_data;
1775 AVFrame *frame = data;
1778 /* get output buffer */
1779 frame->nb_samples = s->samples_per_frame;
1780 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
1785 return decode_packet(avctx, s, data, got_frame_ptr, avpkt);
1788 static int xma_decode_packet(AVCodecContext *avctx, void *data,
1789 int *got_frame_ptr, AVPacket *avpkt)
1791 XMADecodeCtx *s = avctx->priv_data;
1792 int got_stream_frame_ptr = 0;
1793 AVFrame *frame = data;
1794 int i, ret, offset = INT_MAX;
1796 /* decode current stream packet */
1797 ret = decode_packet(avctx, &s->xma[s->current_stream], s->frames[s->current_stream],
1798 &got_stream_frame_ptr, avpkt);
1800 /* copy stream samples (1/2ch) to sample buffer (Nch) */
1801 if (got_stream_frame_ptr) {
1802 int start_ch = s->start_channel[s->current_stream];
1803 memcpy(&s->samples[start_ch + 0][s->offset[s->current_stream] * 512],
1804 s->frames[s->current_stream]->extended_data[0], 512 * 4);
1805 if (s->xma[s->current_stream].nb_channels > 1)
1806 memcpy(&s->samples[start_ch + 1][s->offset[s->current_stream] * 512],
1807 s->frames[s->current_stream]->extended_data[1], 512 * 4);
1808 s->offset[s->current_stream]++;
1809 } else if (ret < 0) {
1810 memset(s->offset, 0, sizeof(s->offset));
1811 s->current_stream = 0;
1815 /* find next XMA packet's owner stream, and update.
1816 * XMA streams find their packets following packet_skips
1817 * (at start there is one packet per stream, then interleave non-linearly). */
1818 if (s->xma[s->current_stream].packet_done ||
1819 s->xma[s->current_stream].packet_loss) {
1821 /* select stream with 0 skip_packets (= uses next packet) */
1822 if (s->xma[s->current_stream].skip_packets != 0) {
1825 min[0] = s->xma[0].skip_packets;
1828 for (i = 1; i < s->num_streams; i++) {
1829 if (s->xma[i].skip_packets < min[0]) {
1830 min[0] = s->xma[i].skip_packets;
1835 s->current_stream = min[1];
1838 /* all other streams skip next packet */
1839 for (i = 0; i < s->num_streams; i++) {
1840 s->xma[i].skip_packets = FFMAX(0, s->xma[i].skip_packets - 1);
1843 /* copy samples from buffer to output if possible */
1844 for (i = 0; i < s->num_streams; i++) {
1845 offset = FFMIN(offset, s->offset[i]);
1850 frame->nb_samples = 512 * offset;
1851 if ((bret = ff_get_buffer(avctx, frame, 0)) < 0)
1854 /* copy samples buffer (Nch) to frame samples (Nch), move unconsumed samples */
1855 for (i = 0; i < s->num_streams; i++) {
1856 int start_ch = s->start_channel[i];
1857 memcpy(frame->extended_data[start_ch + 0], s->samples[start_ch + 0], frame->nb_samples * 4);
1858 if (s->xma[i].nb_channels > 1)
1859 memcpy(frame->extended_data[start_ch + 1], s->samples[start_ch + 1], frame->nb_samples * 4);
1861 s->offset[i] -= offset;
1863 memmove(s->samples[start_ch + 0], s->samples[start_ch + 0] + frame->nb_samples, s->offset[i] * 4 * 512);
1864 if (s->xma[i].nb_channels > 1)
1865 memmove(s->samples[start_ch + 1], s->samples[start_ch + 1] + frame->nb_samples, s->offset[i] * 4 * 512);
1876 static av_cold int xma_decode_init(AVCodecContext *avctx)
1878 XMADecodeCtx *s = avctx->priv_data;
1879 int i, ret, start_channels = 0;
1881 if (avctx->channels <= 0 || avctx->extradata_size == 0)
1882 return AVERROR_INVALIDDATA;
1884 /* get stream config */
1885 if (avctx->codec_id == AV_CODEC_ID_XMA2 && avctx->extradata_size == 34) { /* XMA2WAVEFORMATEX */
1886 s->num_streams = (avctx->channels + 1) / 2;
1887 } else if (avctx->codec_id == AV_CODEC_ID_XMA2 && avctx->extradata_size >= 2) { /* XMA2WAVEFORMAT */
1888 s->num_streams = avctx->extradata[1];
1889 if (avctx->extradata_size != (32 + ((avctx->extradata[0]==3)?0:8) + 4*s->num_streams)) {
1890 av_log(avctx, AV_LOG_ERROR, "Incorrect XMA2 extradata size\n");
1891 return AVERROR(EINVAL);
1893 } else if (avctx->codec_id == AV_CODEC_ID_XMA1 && avctx->extradata_size >= 4) { /* XMAWAVEFORMAT */
1894 s->num_streams = avctx->extradata[4];
1895 if (avctx->extradata_size != (8 + 20*s->num_streams)) {
1896 av_log(avctx, AV_LOG_ERROR, "Incorrect XMA1 extradata size\n");
1897 return AVERROR(EINVAL);
1900 av_log(avctx, AV_LOG_ERROR, "Incorrect XMA config\n");
1901 return AVERROR(EINVAL);
1904 /* encoder supports up to 64 streams / 64*2 channels (would have to alloc arrays) */
1905 if (avctx->channels > XMA_MAX_CHANNELS || s->num_streams > XMA_MAX_STREAMS) {
1906 avpriv_request_sample(avctx, "More than %d channels in %d streams", XMA_MAX_CHANNELS, s->num_streams);
1907 return AVERROR_PATCHWELCOME;
1910 /* init all streams (several streams of 1/2ch make Nch files) */
1911 for (i = 0; i < s->num_streams; i++) {
1912 ret = decode_init(&s->xma[i], avctx, i);
1915 s->frames[i] = av_frame_alloc();
1917 return AVERROR(ENOMEM);
1918 s->frames[i]->nb_samples = 512;
1919 if ((ret = ff_get_buffer(avctx, s->frames[i], 0)) < 0) {
1920 return AVERROR(ENOMEM);
1923 s->start_channel[i] = start_channels;
1924 start_channels += s->xma[i].nb_channels;
1930 static av_cold int xma_decode_end(AVCodecContext *avctx)
1932 XMADecodeCtx *s = avctx->priv_data;
1935 for (i = 0; i < s->num_streams; i++) {
1936 decode_end(&s->xma[i]);
1937 av_frame_free(&s->frames[i]);
1943 static void flush(WMAProDecodeCtx *s)
1946 /** reset output buffer as a part of it is used during the windowing of a
1948 for (i = 0; i < s->nb_channels; i++)
1949 memset(s->channel[i].out, 0, s->samples_per_frame *
1950 sizeof(*s->channel[i].out));
1952 s->skip_packets = 0;
1958 *@brief Clear decoder buffers (for seeking).
1959 *@param avctx codec context
1961 static void wmapro_flush(AVCodecContext *avctx)
1963 WMAProDecodeCtx *s = avctx->priv_data;
1968 static void xma_flush(AVCodecContext *avctx)
1970 XMADecodeCtx *s = avctx->priv_data;
1973 for (i = 0; i < s->num_streams; i++)
1976 memset(s->offset, 0, sizeof(s->offset));
1977 s->current_stream = 0;
1982 *@brief wmapro decoder
1984 AVCodec ff_wmapro_decoder = {
1986 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
1987 .type = AVMEDIA_TYPE_AUDIO,
1988 .id = AV_CODEC_ID_WMAPRO,
1989 .priv_data_size = sizeof(WMAProDecodeCtx),
1990 .init = wmapro_decode_init,
1991 .close = wmapro_decode_end,
1992 .decode = wmapro_decode_packet,
1993 .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
1994 .flush = wmapro_flush,
1995 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1996 AV_SAMPLE_FMT_NONE },
1999 AVCodec ff_xma1_decoder = {
2001 .long_name = NULL_IF_CONFIG_SMALL("Xbox Media Audio 1"),
2002 .type = AVMEDIA_TYPE_AUDIO,
2003 .id = AV_CODEC_ID_XMA1,
2004 .priv_data_size = sizeof(XMADecodeCtx),
2005 .init = xma_decode_init,
2006 .close = xma_decode_end,
2007 .decode = xma_decode_packet,
2008 .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
2009 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
2010 AV_SAMPLE_FMT_NONE },
2013 AVCodec ff_xma2_decoder = {
2015 .long_name = NULL_IF_CONFIG_SMALL("Xbox Media Audio 2"),
2016 .type = AVMEDIA_TYPE_AUDIO,
2017 .id = AV_CODEC_ID_XMA2,
2018 .priv_data_size = sizeof(XMADecodeCtx),
2019 .init = xma_decode_init,
2020 .close = xma_decode_end,
2021 .decode = xma_decode_packet,
2023 .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
2024 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
2025 AV_SAMPLE_FMT_NONE },