2 * WMA compatible decoder
4 * Extracted 2009 from the mplayer source code 2009-02-10.
6 * Copyright (c) 2002 The FFmpeg Project
8 * Licensed under the GNU Lesser General Public License.
9 * For licencing details see COPYING.LIB.
12 /** \file wmadec_filter.c paraslash's WMA decoder. */
15 * This decoder handles Microsoft Windows Media Audio data version 2.
18 #define _XOPEN_SOURCE 600
22 #include <sys/select.h>
29 #include "buffer_tree.h"
31 #include "portable_io.h"
32 #include "bitstream.h"
39 #define BLOCK_MIN_BITS 7
40 #define BLOCK_MAX_BITS 11
41 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
43 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
45 /* XXX: find exact max size */
46 #define HIGH_BAND_MAX_SIZE 16
48 /* XXX: is it a suitable value ? */
49 #define MAX_CODED_SUPERFRAME_SIZE 16384
51 #define MAX_CHANNELS 2
53 #define NOISE_TAB_SIZE 8192
55 #define LSP_POW_BITS 7
57 struct private_wmadec_data {
58 /** Information contained in the audio file header. */
59 struct asf_header_info ahi;
60 struct getbit_context gb;
61 /** Whether perceptual noise is added. */
63 /** Depends on number of the bits per second and the frame length. */
65 /** Only used if ahi->use_exp_vlc is true. */
67 uint16_t exponent_bands[BLOCK_NB_SIZES][25];
68 /** The index of the first coef in high band. */
69 int high_band_start[BLOCK_NB_SIZES];
70 /** Maximal number of coded coefficients. */
71 int coefs_end[BLOCK_NB_SIZES];
72 int exponent_high_sizes[BLOCK_NB_SIZES];
73 int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
76 /* coded values in high bands */
77 int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
78 int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
80 /* there are two possible tables for spectral coefficients */
81 struct vlc coef_vlc[2];
82 uint16_t *run_table[2];
83 uint16_t *level_table[2];
84 const struct coef_vlc_table *coef_vlcs[2];
85 /** Frame length in samples. */
87 /** log2 of frame_len. */
89 /** Number of block sizes, one if !ahi->use_variable_block_len. */
91 /* Whether to update block lengths from getbit context. */
92 bool reset_block_lengths;
93 /** log2 of current block length. */
95 /** log2 of next block length. */
96 int next_block_len_bits;
97 /** log2 of previous block length. */
98 int prev_block_len_bits;
99 /** Block length in samples. */
101 /** Current position in frame. */
103 /** True if mid/side stereo mode. */
105 /** True if channel is coded. */
106 uint8_t channel_coded[MAX_CHANNELS];
107 /** log2 ratio frame/exp. length. */
108 int exponents_bsize[MAX_CHANNELS];
110 float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
111 float max_exponent[MAX_CHANNELS];
112 int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
113 float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE];
114 float output[BLOCK_MAX_SIZE * 2];
115 struct mdct_context *mdct_ctx[BLOCK_NB_SIZES];
116 float *windows[BLOCK_NB_SIZES];
117 /** Output buffer for one frame and the last for IMDCT windowing. */
118 float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
119 /** Last frame info. */
120 uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
122 int last_superframe_len;
123 float noise_table[NOISE_TAB_SIZE];
125 float noise_mult; /* XXX: suppress that and integrate it in the noise array */
126 /* lsp_to_curve tables */
127 float lsp_cos_table[BLOCK_MAX_SIZE];
128 float lsp_pow_e_table[256];
129 float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
130 float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
134 #define HGAINVLCBITS 9
137 /** \cond sine_winows */
139 #define SINE_WINDOW(x) static float sine_ ## x[x] __a_aligned(16)
148 static float *sine_windows[6] = {
149 sine_128, sine_256, sine_512, sine_1024, sine_2048, sine_4096
151 /** \endcond sine_windows */
153 /* Generate a sine window. */
154 static void sine_window_init(float *window, int n)
158 for (i = 0; i < n; i++)
159 window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
162 static void init_coef_vlc(struct vlc *vlc, uint16_t **prun_table,
163 uint16_t **plevel_table, const struct coef_vlc_table *vlc_table)
165 int n = vlc_table->n;
166 const uint8_t *table_bits = vlc_table->huffbits;
167 const uint32_t *table_codes = vlc_table->huffcodes;
168 const uint16_t *levels_table = vlc_table->levels;
169 uint16_t *run_table, *level_table;
170 int i, l, j, k, level;
172 init_vlc(vlc, VLCBITS, n, table_bits, table_codes, 4);
174 run_table = para_malloc(n * sizeof(uint16_t));
175 level_table = para_malloc(n * sizeof(uint16_t));
180 l = levels_table[k++];
181 for (j = 0; j < l; j++) {
183 level_table[i] = level;
188 *prun_table = run_table;
189 *plevel_table = level_table;
192 /* compute the scale factor band sizes for each MDCT block size */
193 static void compute_scale_factor_band_sizes(struct private_wmadec_data *pwd,
196 struct asf_header_info *ahi = &pwd->ahi;
197 int a, b, pos, lpos, k, block_len, i, j, n;
198 const uint8_t *table;
200 for (k = 0; k < pwd->nb_block_sizes; k++) {
203 block_len = pwd->frame_len >> k;
205 a = pwd->frame_len_bits - BLOCK_MIN_BITS - k;
207 if (ahi->sample_rate >= 44100)
208 table = exponent_band_44100[a];
209 else if (ahi->sample_rate >= 32000)
210 table = exponent_band_32000[a];
211 else if (ahi->sample_rate >= 22050)
212 table = exponent_band_22050[a];
216 for (i = 0; i < n; i++)
217 pwd->exponent_bands[k][i] = table[i];
222 for (i = 0; i < 25; i++) {
223 a = wma_critical_freqs[i];
224 b = ahi->sample_rate;
225 pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
230 pwd->exponent_bands[k][j++] = pos - lpos;
231 if (pos >= block_len)
238 /* max number of coefs */
239 pwd->coefs_end[k] = (pwd->frame_len - ((pwd->frame_len * 9) / 100)) >> k;
240 /* high freq computation */
241 pwd->high_band_start[k] = (int) ((block_len * 2 * high_freq)
242 / ahi->sample_rate + 0.5);
246 for (i = 0; i < n; i++) {
249 pos += pwd->exponent_bands[k][i];
251 if (start < pwd->high_band_start[k])
252 start = pwd->high_band_start[k];
253 if (end > pwd->coefs_end[k])
254 end = pwd->coefs_end[k];
256 pwd->exponent_high_bands[k][j++] = end - start;
258 pwd->exponent_high_sizes[k] = j;
262 static int wma_init(struct private_wmadec_data *pwd)
265 float bps1, high_freq;
269 struct asf_header_info *ahi = &pwd->ahi;
270 int flags2 = ahi->flags2;
272 if (ahi->sample_rate <= 0 || ahi->sample_rate > 50000
273 || ahi->channels <= 0 || ahi->channels > 8
274 || ahi->bit_rate <= 0)
275 return -E_WMA_BAD_PARAMS;
277 /* compute MDCT block size */
278 if (ahi->sample_rate <= 16000)
279 pwd->frame_len_bits = 9;
280 else if (ahi->sample_rate <= 22050)
281 pwd->frame_len_bits = 10;
283 pwd->frame_len_bits = 11;
284 pwd->frame_len = 1 << pwd->frame_len_bits;
285 if (pwd->ahi.use_variable_block_len) {
287 nb = ((flags2 >> 3) & 3) + 1;
288 if ((ahi->bit_rate / ahi->channels) >= 32000)
290 nb_max = pwd->frame_len_bits - BLOCK_MIN_BITS;
293 pwd->nb_block_sizes = nb + 1;
295 pwd->nb_block_sizes = 1;
297 /* init rate dependent parameters */
298 pwd->use_noise_coding = 1;
299 high_freq = ahi->sample_rate * 0.5;
301 /* wma2 rates are normalized */
302 sample_rate1 = ahi->sample_rate;
303 if (sample_rate1 >= 44100)
304 sample_rate1 = 44100;
305 else if (sample_rate1 >= 22050)
306 sample_rate1 = 22050;
307 else if (sample_rate1 >= 16000)
308 sample_rate1 = 16000;
309 else if (sample_rate1 >= 11025)
310 sample_rate1 = 11025;
311 else if (sample_rate1 >= 8000)
314 bps = (float) ahi->bit_rate / (float) (ahi->channels * ahi->sample_rate);
315 pwd->byte_offset_bits = wma_log2((int) (bps * pwd->frame_len / 8.0 + 0.5)) + 2;
317 * Compute high frequency value and choose if noise coding should be
321 if (ahi->channels == 2)
323 if (sample_rate1 == 44100) {
325 pwd->use_noise_coding = 0;
327 high_freq = high_freq * 0.4;
328 } else if (sample_rate1 == 22050) {
330 pwd->use_noise_coding = 0;
331 else if (bps1 >= 0.72)
332 high_freq = high_freq * 0.7;
334 high_freq = high_freq * 0.6;
335 } else if (sample_rate1 == 16000) {
337 high_freq = high_freq * 0.5;
339 high_freq = high_freq * 0.3;
340 } else if (sample_rate1 == 11025)
341 high_freq = high_freq * 0.7;
342 else if (sample_rate1 == 8000) {
344 high_freq = high_freq * 0.5;
346 pwd->use_noise_coding = 0;
348 high_freq = high_freq * 0.65;
351 high_freq = high_freq * 0.75;
353 high_freq = high_freq * 0.6;
355 high_freq = high_freq * 0.5;
357 PARA_INFO_LOG("channels=%u sample_rate=%u "
358 "bitrate=%u block_align=%d\n",
359 ahi->channels, ahi->sample_rate,
360 ahi->bit_rate, ahi->block_align);
361 PARA_INFO_LOG("frame_len=%d, bps=%f bps1=%f "
362 "high_freq=%f bitoffset=%d\n",
363 pwd->frame_len, bps, bps1,
364 high_freq, pwd->byte_offset_bits);
365 PARA_INFO_LOG("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
366 pwd->use_noise_coding, pwd->ahi.use_exp_vlc, pwd->nb_block_sizes);
368 compute_scale_factor_band_sizes(pwd, high_freq);
369 /* init MDCT windows : simple sinus window */
370 for (i = 0; i < pwd->nb_block_sizes; i++) {
372 n = 1 << (pwd->frame_len_bits - i);
373 sine_window_init(sine_windows[pwd->frame_len_bits - i - 7], n);
374 pwd->windows[i] = sine_windows[pwd->frame_len_bits - i - 7];
377 pwd->reset_block_lengths = true;
379 if (pwd->use_noise_coding) {
380 /* init the noise generator */
381 if (pwd->ahi.use_exp_vlc)
382 pwd->noise_mult = 0.02;
384 pwd->noise_mult = 0.04;
390 norm = (1.0 / (float) (1LL << 31)) * sqrt(3) * pwd->noise_mult;
391 for (i = 0; i < NOISE_TAB_SIZE; i++) {
392 seed = seed * 314159 + 1;
393 pwd->noise_table[i] = (float) ((int) seed) * norm;
398 /* choose the VLC tables for the coefficients */
400 if (ahi->sample_rate >= 32000) {
403 else if (bps1 < 1.16)
406 pwd->coef_vlcs[0] = &coef_vlcs[coef_vlc_table * 2];
407 pwd->coef_vlcs[1] = &coef_vlcs[coef_vlc_table * 2 + 1];
408 init_coef_vlc(&pwd->coef_vlc[0], &pwd->run_table[0], &pwd->level_table[0],
410 init_coef_vlc(&pwd->coef_vlc[1], &pwd->run_table[1], &pwd->level_table[1],
415 static void wma_lsp_to_curve_init(struct private_wmadec_data *pwd)
420 wdel = M_PI / pwd->frame_len;
421 for (i = 0; i < pwd->frame_len; i++)
422 pwd->lsp_cos_table[i] = 2.0f * cos(wdel * i);
424 /* tables for x^-0.25 computation */
425 for (i = 0; i < 256; i++) {
427 pwd->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
430 /* These two tables are needed to avoid two operations in pow_m1_4. */
432 for (i = (1 << LSP_POW_BITS) - 1; i >= 0; i--) {
433 m = (1 << LSP_POW_BITS) + i;
434 a = (float) m *(0.5 / (1 << LSP_POW_BITS));
436 pwd->lsp_pow_m_table1[i] = 2 * a - b;
437 pwd->lsp_pow_m_table2[i] = b - a;
442 static int wma_decode_init(char *initial_buf, int len, struct private_wmadec_data **result)
444 struct private_wmadec_data *pwd;
447 PARA_NOTICE_LOG("initial buf: %d bytes\n", len);
448 pwd = para_calloc(sizeof(*pwd));
449 ret = read_asf_header(initial_buf, len, &pwd->ahi);
459 for (i = 0; i < pwd->nb_block_sizes; i++) {
460 ret = imdct_init(pwd->frame_len_bits - i + 1, &pwd->mdct_ctx[i]);
464 if (pwd->use_noise_coding) {
465 PARA_INFO_LOG("using noise coding\n");
466 init_vlc(&pwd->hgain_vlc, HGAINVLCBITS,
467 sizeof(wma_hgain_huffbits), wma_hgain_huffbits,
468 wma_hgain_huffcodes, 2);
471 if (pwd->ahi.use_exp_vlc) {
472 PARA_INFO_LOG("using exp_vlc\n");
473 init_vlc(&pwd->exp_vlc, EXPVLCBITS, sizeof(wma_scale_huffbits),
474 wma_scale_huffbits, wma_scale_huffcodes, 4);
476 PARA_INFO_LOG("using curve\n");
477 wma_lsp_to_curve_init(pwd);
480 return pwd->ahi.header_len;
484 * compute x^-0.25 with an exponent and mantissa table. We use linear
485 * interpolation to reduce the mantissa table size at a small speed
486 * expense (linear interpolation approximately doubles the number of
487 * bits of precision).
489 static inline float pow_m1_4(struct private_wmadec_data *pwd, float x)
500 m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
501 /* build interpolation scale: 1 <= t < 2. */
502 t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
503 a = pwd->lsp_pow_m_table1[m];
504 b = pwd->lsp_pow_m_table2[m];
505 return pwd->lsp_pow_e_table[e] * (a + b * t.f);
508 static void wma_lsp_to_curve(struct private_wmadec_data *pwd,
509 float *out, float *val_max_ptr, int n, float *lsp)
512 float p, q, w, v, val_max;
515 for (i = 0; i < n; i++) {
518 w = pwd->lsp_cos_table[i];
519 for (j = 1; j < NB_LSP_COEFS; j += 2) {
526 v = pow_m1_4(pwd, v);
531 *val_max_ptr = val_max;
534 /* Decode exponents coded with LSP coefficients (same idea as Vorbis). */
535 static void decode_exp_lsp(struct private_wmadec_data *pwd, int ch)
537 float lsp_coefs[NB_LSP_COEFS];
540 for (i = 0; i < NB_LSP_COEFS; i++) {
541 if (i == 0 || i >= 8)
542 val = get_bits(&pwd->gb, 3);
544 val = get_bits(&pwd->gb, 4);
545 lsp_coefs[i] = wma_lsp_codebook[i][val];
548 wma_lsp_to_curve(pwd, pwd->exponents[ch], &pwd->max_exponent[ch],
549 pwd->block_len, lsp_coefs);
552 /* Decode exponents coded with VLC codes. */
553 static int decode_exp_vlc(struct private_wmadec_data *pwd, int ch)
555 int last_exp, n, code;
556 const uint16_t *ptr, *band_ptr;
557 float v, *q, max_scale, *q_end;
559 band_ptr = pwd->exponent_bands[pwd->frame_len_bits - pwd->block_len_bits];
561 q = pwd->exponents[ch];
562 q_end = q + pwd->block_len;
567 code = get_vlc(&pwd->gb, &pwd->exp_vlc);
570 /* NOTE: this offset is the same as MPEG4 AAC ! */
571 last_exp += code - 60;
572 /* XXX: use a table */
573 v = pow(10, last_exp * (1.0 / 16.0));
581 pwd->max_exponent[ch] = max_scale;
585 /* compute src0 * src1 + src2 */
586 static inline void vector_mult_add(float *dst, const float *src0, const float *src1,
587 const float *src2, int len)
591 for (i = 0; i < len; i++)
592 dst[i] = src0[i] * src1[i] + src2[i];
595 static inline void vector_mult_reverse(float *dst, const float *src0,
596 const float *src1, int len)
601 for (i = 0; i < len; i++)
602 dst[i] = src0[i] * src1[-i];
606 * Apply MDCT window and add into output.
608 * We ensure that when the windows overlap their squared sum
609 * is always 1 (MDCT reconstruction rule).
611 static void wma_window(struct private_wmadec_data *pwd, float *out)
613 float *in = pwd->output;
614 int block_len, bsize, n;
617 if (pwd->block_len_bits <= pwd->prev_block_len_bits) {
618 block_len = pwd->block_len;
619 bsize = pwd->frame_len_bits - pwd->block_len_bits;
620 vector_mult_add(out, in, pwd->windows[bsize], out, block_len);
622 block_len = 1 << pwd->prev_block_len_bits;
623 n = (pwd->block_len - block_len) / 2;
624 bsize = pwd->frame_len_bits - pwd->prev_block_len_bits;
625 vector_mult_add(out + n, in + n, pwd->windows[bsize], out + n,
627 memcpy(out + n + block_len, in + n + block_len,
630 out += pwd->block_len;
631 in += pwd->block_len;
633 if (pwd->block_len_bits <= pwd->next_block_len_bits) {
634 block_len = pwd->block_len;
635 bsize = pwd->frame_len_bits - pwd->block_len_bits;
636 vector_mult_reverse(out, in, pwd->windows[bsize], block_len);
638 block_len = 1 << pwd->next_block_len_bits;
639 n = (pwd->block_len - block_len) / 2;
640 bsize = pwd->frame_len_bits - pwd->next_block_len_bits;
641 memcpy(out, in, n * sizeof(float));
642 vector_mult_reverse(out + n, in + n, pwd->windows[bsize],
644 memset(out + n + block_len, 0, n * sizeof(float));
648 static int wma_total_gain_to_bits(int total_gain)
652 else if (total_gain < 32)
654 else if (total_gain < 40)
656 else if (total_gain < 45)
662 static int compute_high_band_values(struct private_wmadec_data *pwd,
663 int bsize, int nb_coefs[MAX_CHANNELS])
667 if (!pwd->use_noise_coding)
669 for (ch = 0; ch < pwd->ahi.channels; ch++) {
671 if (!pwd->channel_coded[ch])
673 m = pwd->exponent_high_sizes[bsize];
674 for (i = 0; i < m; i++) {
675 a = get_bit(&pwd->gb);
676 pwd->high_band_coded[ch][i] = a;
679 nb_coefs[ch] -= pwd->exponent_high_bands[bsize][i];
682 for (ch = 0; ch < pwd->ahi.channels; ch++) {
684 if (!pwd->channel_coded[ch])
686 n = pwd->exponent_high_sizes[bsize];
687 val = (int)0x80000000;
688 for (i = 0; i < n; i++) {
689 if (!pwd->high_band_coded[ch][i])
691 if (val == (int)0x80000000)
692 val = get_bits(&pwd->gb, 7) - 19;
694 int code = get_vlc(&pwd->gb, &pwd->hgain_vlc);
699 pwd->high_band_values[ch][i] = val;
705 static void compute_mdct_coefficients(struct private_wmadec_data *pwd,
706 int bsize, int total_gain, int nb_coefs[MAX_CHANNELS])
709 float mdct_norm = 1.0 / (pwd->block_len / 2);
711 for (ch = 0; ch < pwd->ahi.channels; ch++) {
713 float *coefs, *exponents, mult, mult1, noise;
714 int i, j, n, n1, last_high_band, esize;
715 float exp_power[HIGH_BAND_MAX_SIZE];
717 if (!pwd->channel_coded[ch])
719 coefs1 = pwd->coefs1[ch];
720 exponents = pwd->exponents[ch];
721 esize = pwd->exponents_bsize[ch];
722 mult = pow(10, total_gain * 0.05) / pwd->max_exponent[ch];
724 coefs = pwd->coefs[ch];
725 if (!pwd->use_noise_coding) {
726 /* XXX: optimize more */
728 for (i = 0; i < n; i++)
729 *coefs++ = coefs1[i] *
730 exponents[i << bsize >> esize] * mult;
731 n = pwd->block_len - pwd->coefs_end[bsize];
732 for (i = 0; i < n; i++)
736 n1 = pwd->exponent_high_sizes[bsize];
737 /* compute power of high bands */
738 exponents = pwd->exponents[ch] +
739 (pwd->high_band_start[bsize] << bsize);
740 last_high_band = 0; /* avoid warning */
741 for (j = 0; j < n1; j++) {
742 n = pwd->exponent_high_bands[
743 pwd->frame_len_bits - pwd->block_len_bits][j];
744 if (pwd->high_band_coded[ch][j]) {
747 for (i = 0; i < n; i++) {
748 val = exponents[i << bsize >> esize];
751 exp_power[j] = e2 / n;
754 exponents += n << bsize;
756 /* main freqs and high freqs */
757 exponents = pwd->exponents[ch];
758 for (j = -1; j < n1; j++) {
760 n = pwd->high_band_start[bsize];
762 n = pwd->exponent_high_bands[pwd->frame_len_bits
763 - pwd->block_len_bits][j];
764 if (j >= 0 && pwd->high_band_coded[ch][j]) {
765 /* use noise with specified power */
766 mult1 = sqrt(exp_power[j]
767 / exp_power[last_high_band]);
768 /* XXX: use a table */
769 mult1 *= pow(10, pwd->high_band_values[ch][j] * 0.05);
770 mult1 /= (pwd->max_exponent[ch] * pwd->noise_mult);
772 for (i = 0; i < n; i++) {
773 noise = pwd->noise_table[pwd->noise_index];
774 pwd->noise_index = (pwd->noise_index + 1)
775 & (NOISE_TAB_SIZE - 1);
776 *coefs++ = noise * exponents[
777 i << bsize >> esize] * mult1;
779 exponents += n << bsize;
781 /* coded values + small noise */
782 for (i = 0; i < n; i++) {
783 noise = pwd->noise_table[pwd->noise_index];
784 pwd->noise_index = (pwd->noise_index + 1)
785 & (NOISE_TAB_SIZE - 1);
786 *coefs++ = ((*coefs1++) + noise) *
787 exponents[i << bsize >> esize]
790 exponents += n << bsize;
793 /* very high freqs: noise */
794 n = pwd->block_len - pwd->coefs_end[bsize];
795 mult1 = mult * exponents[(-(1 << bsize)) >> esize];
796 for (i = 0; i < n; i++) {
797 *coefs++ = pwd->noise_table[pwd->noise_index] * mult1;
798 pwd->noise_index = (pwd->noise_index + 1)
799 & (NOISE_TAB_SIZE - 1);
805 * Returns 0 if OK, 1 if last block of frame, negative on uncorrectable
808 static int wma_decode_block(struct private_wmadec_data *pwd)
810 int ret, n, v, ch, code, bsize;
811 int coef_nb_bits, total_gain;
812 int nb_coefs[MAX_CHANNELS];
814 /* compute current block length */
815 if (pwd->ahi.use_variable_block_len) {
816 n = wma_log2(pwd->nb_block_sizes - 1) + 1;
818 if (pwd->reset_block_lengths) {
819 pwd->reset_block_lengths = false;
820 v = get_bits(&pwd->gb, n);
821 if (v >= pwd->nb_block_sizes)
822 return -E_WMA_BLOCK_SIZE;
823 pwd->prev_block_len_bits = pwd->frame_len_bits - v;
824 v = get_bits(&pwd->gb, n);
825 if (v >= pwd->nb_block_sizes)
826 return -E_WMA_BLOCK_SIZE;
827 pwd->block_len_bits = pwd->frame_len_bits - v;
829 /* update block lengths */
830 pwd->prev_block_len_bits = pwd->block_len_bits;
831 pwd->block_len_bits = pwd->next_block_len_bits;
833 v = get_bits(&pwd->gb, n);
834 if (v >= pwd->nb_block_sizes)
835 return -E_WMA_BLOCK_SIZE;
836 pwd->next_block_len_bits = pwd->frame_len_bits - v;
838 /* fixed block len */
839 pwd->next_block_len_bits = pwd->frame_len_bits;
840 pwd->prev_block_len_bits = pwd->frame_len_bits;
841 pwd->block_len_bits = pwd->frame_len_bits;
844 /* now check if the block length is coherent with the frame length */
845 pwd->block_len = 1 << pwd->block_len_bits;
846 if ((pwd->block_pos + pwd->block_len) > pwd->frame_len)
847 return -E_INCOHERENT_BLOCK_LEN;
849 if (pwd->ahi.channels == 2)
850 pwd->ms_stereo = get_bit(&pwd->gb);
852 for (ch = 0; ch < pwd->ahi.channels; ch++) {
853 int a = get_bit(&pwd->gb);
854 pwd->channel_coded[ch] = a;
858 bsize = pwd->frame_len_bits - pwd->block_len_bits;
860 /* if no channel coded, no need to go further */
861 /* XXX: fix potential framing problems */
866 * Read total gain and extract corresponding number of bits for coef
871 int a = get_bits(&pwd->gb, 7);
877 coef_nb_bits = wma_total_gain_to_bits(total_gain);
879 /* compute number of coefficients */
880 n = pwd->coefs_end[bsize];
881 for (ch = 0; ch < pwd->ahi.channels; ch++)
884 ret = compute_high_band_values(pwd, bsize, nb_coefs);
888 /* exponents can be reused in short blocks. */
889 if ((pwd->block_len_bits == pwd->frame_len_bits) || get_bit(&pwd->gb)) {
890 for (ch = 0; ch < pwd->ahi.channels; ch++) {
891 if (pwd->channel_coded[ch]) {
892 if (pwd->ahi.use_exp_vlc) {
893 ret = decode_exp_vlc(pwd, ch);
897 decode_exp_lsp(pwd, ch);
898 pwd->exponents_bsize[ch] = bsize;
903 /* parse spectral coefficients : just RLE encoding */
904 for (ch = 0; ch < pwd->ahi.channels; ch++) {
905 struct vlc *coef_vlc;
906 int level, run, tindex;
908 const uint16_t *level_table, *run_table;
910 if (!pwd->channel_coded[ch])
913 * special VLC tables are used for ms stereo because there is
914 * potentially less energy there
916 tindex = (ch == 1 && pwd->ms_stereo);
917 coef_vlc = &pwd->coef_vlc[tindex];
918 run_table = pwd->run_table[tindex];
919 level_table = pwd->level_table[tindex];
921 ptr = &pwd->coefs1[ch][0];
922 eptr = ptr + nb_coefs[ch];
923 memset(ptr, 0, pwd->block_len * sizeof(int16_t));
925 code = get_vlc(&pwd->gb, coef_vlc);
928 if (code == 1) /* EOB */
930 if (code == 0) { /* escape */
931 level = get_bits(&pwd->gb, coef_nb_bits);
932 /* reading block_len_bits would be better */
933 run = get_bits(&pwd->gb, pwd->frame_len_bits);
934 } else { /* normal code */
935 run = run_table[code];
936 level = level_table[code];
938 if (!get_bit(&pwd->gb))
942 PARA_ERROR_LOG("overflow in spectral RLE, ignoring\n");
946 if (ptr >= eptr) /* EOB can be omitted */
950 compute_mdct_coefficients(pwd, bsize, total_gain, nb_coefs);
951 if (pwd->ms_stereo && pwd->channel_coded[1]) {
955 * Nominal case for ms stereo: we do it before mdct.
957 * No need to optimize this case because it should almost never
960 if (!pwd->channel_coded[0]) {
961 PARA_NOTICE_LOG("rare ms-stereo\n");
962 memset(pwd->coefs[0], 0, sizeof(float) * pwd->block_len);
963 pwd->channel_coded[0] = 1;
965 for (i = 0; i < pwd->block_len; i++) {
966 a = pwd->coefs[0][i];
967 b = pwd->coefs[1][i];
968 pwd->coefs[0][i] = a + b;
969 pwd->coefs[1][i] = a - b;
973 for (ch = 0; ch < pwd->ahi.channels; ch++) {
976 n4 = pwd->block_len / 2;
977 if (pwd->channel_coded[ch])
978 imdct(pwd->mdct_ctx[bsize], pwd->output, pwd->coefs[ch]);
979 else if (!(pwd->ms_stereo && ch == 1))
980 memset(pwd->output, 0, sizeof(pwd->output));
982 /* multiply by the window and add in the frame */
983 idx = (pwd->frame_len / 2) + pwd->block_pos - n4;
984 wma_window(pwd, &pwd->frame_out[ch][idx]);
987 /* update block number */
988 pwd->block_pos += pwd->block_len;
989 if (pwd->block_pos >= pwd->frame_len)
996 * Clip a signed integer value into the -32768,32767 range.
998 * \param a The value to clip.
1000 * \return The clipped value.
1002 static inline int16_t av_clip_int16(int a)
1004 if ((a + 32768) & ~65535)
1005 return (a >> 31) ^ 32767;
1010 /* Decode a frame of frame_len samples. */
1011 static int wma_decode_frame(struct private_wmadec_data *pwd, int16_t *samples)
1017 /* read each block */
1020 ret = wma_decode_block(pwd);
1027 /* convert frame to integer */
1028 for (ch = 0; ch < pwd->ahi.channels; ch++) {
1030 iptr = pwd->frame_out[ch];
1032 for (i = 0; i < pwd->frame_len; i++) {
1033 *ptr = av_clip_int16(lrintf(*iptr++));
1034 ptr += pwd->ahi.channels;
1036 /* prepare for next block */
1037 memmove(&pwd->frame_out[ch][0], &pwd->frame_out[ch][pwd->frame_len],
1038 pwd->frame_len * sizeof(float));
1043 static int wma_decode_superframe(struct private_wmadec_data *pwd, void *out,
1044 int *out_size, const uint8_t *in)
1046 int ret, in_size = pwd->ahi.packet_size - WMA_FRAME_SKIP;
1047 int16_t *samples = out;
1049 init_get_bits(&pwd->gb, in, in_size);
1050 if (pwd->ahi.use_bit_reservoir) {
1051 int i, nb_frames, bit_offset, pos, len;
1054 /* read super frame header */
1055 skip_bits(&pwd->gb, 4); /* super frame index */
1056 nb_frames = get_bits(&pwd->gb, 4) - 1;
1057 // PARA_DEBUG_LOG("have %d frames\n", nb_frames);
1058 ret = -E_WMA_OUTPUT_SPACE;
1059 if ((nb_frames + 1) * pwd->ahi.channels * pwd->frame_len
1060 * sizeof(int16_t) > *out_size)
1063 bit_offset = get_bits(&pwd->gb, pwd->byte_offset_bits + 3);
1065 if (pwd->last_superframe_len > 0) {
1066 /* add bit_offset bits to last frame */
1067 ret = -E_WMA_BAD_SUPERFRAME;
1068 if ((pwd->last_superframe_len + ((bit_offset + 7) >> 3)) >
1069 MAX_CODED_SUPERFRAME_SIZE)
1071 q = pwd->last_superframe + pwd->last_superframe_len;
1074 *q++ = get_bits(&pwd->gb, 8);
1078 *q++ = get_bits(&pwd->gb, len) << (8 - len);
1080 /* XXX: bit_offset bits into last frame */
1081 init_get_bits(&pwd->gb, pwd->last_superframe,
1082 MAX_CODED_SUPERFRAME_SIZE);
1083 /* skip unused bits */
1084 if (pwd->last_bitoffset > 0)
1085 skip_bits(&pwd->gb, pwd->last_bitoffset);
1087 * This frame is stored in the last superframe and in
1090 ret = wma_decode_frame(pwd, samples);
1093 samples += pwd->ahi.channels * pwd->frame_len;
1096 /* read each frame starting from bit_offset */
1097 pos = bit_offset + 4 + 4 + pwd->byte_offset_bits + 3;
1098 init_get_bits(&pwd->gb, in + (pos >> 3),
1099 (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3)));
1102 skip_bits(&pwd->gb, len);
1104 pwd->reset_block_lengths = true;
1105 for (i = 0; i < nb_frames; i++) {
1106 ret = wma_decode_frame(pwd, samples);
1109 samples += pwd->ahi.channels * pwd->frame_len;
1112 /* we copy the end of the frame in the last frame buffer */
1113 pos = get_bits_count(&pwd->gb) +
1114 ((bit_offset + 4 + 4 + pwd->byte_offset_bits + 3) & ~7);
1115 pwd->last_bitoffset = pos & 7;
1117 len = in_size - pos;
1118 ret = -E_WMA_BAD_SUPERFRAME;
1119 if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0)
1121 pwd->last_superframe_len = len;
1122 memcpy(pwd->last_superframe, in + pos, len);
1124 PARA_DEBUG_LOG("not using bit reservoir\n");
1125 ret = -E_WMA_OUTPUT_SPACE;
1126 if (pwd->ahi.channels * pwd->frame_len * sizeof(int16_t) > *out_size)
1128 /* single frame decode */
1129 ret = wma_decode_frame(pwd, samples);
1132 samples += pwd->ahi.channels * pwd->frame_len;
1134 PARA_DEBUG_LOG("frame_len: %d, block_len: %d, outbytes: %d, eaten: %d\n",
1135 pwd->frame_len, pwd->block_len,
1136 (int)((int8_t *)samples - (int8_t *)out), pwd->ahi.block_align);
1137 *out_size = (int8_t *)samples - (int8_t *)out;
1138 return pwd->ahi.block_align;
1140 /* reset the bit reservoir on errors */
1141 pwd->last_superframe_len = 0;
1145 static void wmadec_close(struct filter_node *fn)
1147 struct private_wmadec_data *pwd = fn->private_data;
1152 for (i = 0; i < pwd->nb_block_sizes; i++)
1153 imdct_end(pwd->mdct_ctx[i]);
1154 if (pwd->ahi.use_exp_vlc)
1155 free_vlc(&pwd->exp_vlc);
1156 if (pwd->use_noise_coding)
1157 free_vlc(&pwd->hgain_vlc);
1158 for (i = 0; i < 2; i++) {
1159 free_vlc(&pwd->coef_vlc[i]);
1160 free(pwd->run_table[i]);
1161 free(pwd->level_table[i]);
1163 free(fn->private_data);
1164 fn->private_data = NULL;
1167 static int wmadec_execute(struct btr_node *btrn, const char *cmd, char **result)
1169 struct filter_node *fn = btr_context(btrn);
1170 struct private_wmadec_data *pwd = fn->private_data;
1172 return decoder_execute(cmd, pwd->ahi.sample_rate, pwd->ahi.channels,
1176 #define WMA_OUTPUT_BUFFER_SIZE (128 * 1024)
1178 static int wmadec_post_select(__a_unused struct sched *s, void *context)
1180 struct filter_node *fn = context;
1181 int ret, converted, out_size;
1182 struct private_wmadec_data *pwd = fn->private_data;
1183 struct btr_node *btrn = fn->btrn;
1189 ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
1194 btr_merge(btrn, fn->min_iqs);
1195 len = btr_next_buffer(btrn, &in);
1196 ret = -E_WMADEC_EOF;
1197 if (len < fn->min_iqs)
1200 ret = wma_decode_init(in, len, &pwd);
1204 fn->min_iqs += 4096;
1207 fn->min_iqs = 2 * pwd->ahi.packet_size;
1208 fn->private_data = pwd;
1209 converted = pwd->ahi.header_len;
1212 fn->min_iqs = pwd->ahi.packet_size;
1213 if (fn->min_iqs > len)
1215 out_size = WMA_OUTPUT_BUFFER_SIZE;
1216 out = para_malloc(out_size);
1217 ret = wma_decode_superframe(pwd, out, &out_size,
1218 (uint8_t *)in + WMA_FRAME_SKIP);
1224 out = para_realloc(out, out_size);
1225 btr_add_output(out, out_size, btrn);
1228 converted += pwd->ahi.packet_size;
1230 btr_consume(btrn, converted);
1234 btr_remove_node(&fn->btrn);
1238 static void wmadec_open(struct filter_node *fn)
1240 fn->private_data = NULL;
1244 const struct filter lsg_filter_cmd_com_wmadec_user_data = {
1245 .open = wmadec_open,
1246 .close = wmadec_close,
1247 .execute = wmadec_execute,
1248 .pre_select = generic_filter_pre_select,
1249 .post_select = wmadec_post_select,