Libav 0.7.1
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00001 /* 00002 * Wmapro compatible decoder 00003 * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion 00004 * Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson 00005 * 00006 * This file is part of Libav. 00007 * 00008 * Libav is free software; you can redistribute it and/or 00009 * modify it under the terms of the GNU Lesser General Public 00010 * License as published by the Free Software Foundation; either 00011 * version 2.1 of the License, or (at your option) any later version. 00012 * 00013 * Libav is distributed in the hope that it will be useful, 00014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00016 * Lesser General Public License for more details. 00017 * 00018 * You should have received a copy of the GNU Lesser General Public 00019 * License along with Libav; if not, write to the Free Software 00020 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00021 */ 00022 00089 #include "avcodec.h" 00090 #include "internal.h" 00091 #include "get_bits.h" 00092 #include "put_bits.h" 00093 #include "wmaprodata.h" 00094 #include "dsputil.h" 00095 #include "sinewin.h" 00096 #include "wma.h" 00097 00099 #define WMAPRO_MAX_CHANNELS 8 ///< max number of handled channels 00100 #define MAX_SUBFRAMES 32 ///< max number of subframes per channel 00101 #define MAX_BANDS 29 ///< max number of scale factor bands 00102 #define MAX_FRAMESIZE 32768 ///< maximum compressed frame size 00103 00104 #define WMAPRO_BLOCK_MIN_BITS 6 ///< log2 of min block size 00105 #define WMAPRO_BLOCK_MAX_BITS 12 ///< log2 of max block size 00106 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size 00107 #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes 00108 00109 00110 #define VLCBITS 9 00111 #define SCALEVLCBITS 8 00112 #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS) 00113 #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS) 00114 #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS) 00115 #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS) 00116 #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS) 00117 00118 static VLC sf_vlc; 00119 static VLC sf_rl_vlc; 00120 static VLC vec4_vlc; 00121 static VLC vec2_vlc; 00122 static VLC vec1_vlc; 00123 static VLC coef_vlc[2]; 00124 static float sin64[33]; 00125 00129 typedef struct { 00130 int16_t prev_block_len; 00131 uint8_t transmit_coefs; 00132 uint8_t num_subframes; 00133 uint16_t subframe_len[MAX_SUBFRAMES]; 00134 uint16_t subframe_offset[MAX_SUBFRAMES]; 00135 uint8_t cur_subframe; 00136 uint16_t decoded_samples; 00137 uint8_t grouped; 00138 int quant_step; 00139 int8_t reuse_sf; 00140 int8_t scale_factor_step; 00141 int max_scale_factor; 00142 int saved_scale_factors[2][MAX_BANDS]; 00143 int8_t scale_factor_idx; 00144 int* scale_factors; 00145 uint8_t table_idx; 00146 float* coeffs; 00147 uint16_t num_vec_coeffs; 00148 DECLARE_ALIGNED(32, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2]; 00149 } WMAProChannelCtx; 00150 00154 typedef struct { 00155 uint8_t num_channels; 00156 int8_t transform; 00157 int8_t transform_band[MAX_BANDS]; 00158 float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS]; 00159 float* channel_data[WMAPRO_MAX_CHANNELS]; 00160 } WMAProChannelGrp; 00161 00165 typedef struct WMAProDecodeCtx { 00166 /* generic decoder variables */ 00167 AVCodecContext* avctx; 00168 DSPContext dsp; 00169 uint8_t frame_data[MAX_FRAMESIZE + 00170 FF_INPUT_BUFFER_PADDING_SIZE]; 00171 PutBitContext pb; 00172 FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES]; 00173 DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE]; 00174 float* windows[WMAPRO_BLOCK_SIZES]; 00175 00176 /* frame size dependent frame information (set during initialization) */ 00177 uint32_t decode_flags; 00178 uint8_t len_prefix; 00179 uint8_t dynamic_range_compression; 00180 uint8_t bits_per_sample; 00181 uint16_t samples_per_frame; 00182 uint16_t log2_frame_size; 00183 int8_t num_channels; 00184 int8_t lfe_channel; 00185 uint8_t max_num_subframes; 00186 uint8_t subframe_len_bits; 00187 uint8_t max_subframe_len_bit; 00188 uint16_t min_samples_per_subframe; 00189 int8_t num_sfb[WMAPRO_BLOCK_SIZES]; 00190 int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS]; 00191 int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]; 00192 int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; 00193 00194 /* packet decode state */ 00195 GetBitContext pgb; 00196 int next_packet_start; 00197 uint8_t packet_offset; 00198 uint8_t packet_sequence_number; 00199 int num_saved_bits; 00200 int frame_offset; 00201 int subframe_offset; 00202 uint8_t packet_loss; 00203 uint8_t packet_done; 00204 00205 /* frame decode state */ 00206 uint32_t frame_num; 00207 GetBitContext gb; 00208 int buf_bit_size; 00209 float* samples; 00210 float* samples_end; 00211 uint8_t drc_gain; 00212 int8_t skip_frame; 00213 int8_t parsed_all_subframes; 00214 00215 /* subframe/block decode state */ 00216 int16_t subframe_len; 00217 int8_t channels_for_cur_subframe; 00218 int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS]; 00219 int8_t num_bands; 00220 int8_t transmit_num_vec_coeffs; 00221 int16_t* cur_sfb_offsets; 00222 uint8_t table_idx; 00223 int8_t esc_len; 00224 00225 uint8_t num_chgroups; 00226 WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS]; 00227 00228 WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS]; 00229 } WMAProDecodeCtx; 00230 00231 00236 static void av_cold dump_context(WMAProDecodeCtx *s) 00237 { 00238 #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b); 00239 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b); 00240 00241 PRINT("ed sample bit depth", s->bits_per_sample); 00242 PRINT_HEX("ed decode flags", s->decode_flags); 00243 PRINT("samples per frame", s->samples_per_frame); 00244 PRINT("log2 frame size", s->log2_frame_size); 00245 PRINT("max num subframes", s->max_num_subframes); 00246 PRINT("len prefix", s->len_prefix); 00247 PRINT("num channels", s->num_channels); 00248 } 00249 00255 static av_cold int decode_end(AVCodecContext *avctx) 00256 { 00257 WMAProDecodeCtx *s = avctx->priv_data; 00258 int i; 00259 00260 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) 00261 ff_mdct_end(&s->mdct_ctx[i]); 00262 00263 return 0; 00264 } 00265 00271 static av_cold int decode_init(AVCodecContext *avctx) 00272 { 00273 WMAProDecodeCtx *s = avctx->priv_data; 00274 uint8_t *edata_ptr = avctx->extradata; 00275 unsigned int channel_mask; 00276 int i; 00277 int log2_max_num_subframes; 00278 int num_possible_block_sizes; 00279 00280 s->avctx = avctx; 00281 dsputil_init(&s->dsp, avctx); 00282 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE); 00283 00284 avctx->sample_fmt = AV_SAMPLE_FMT_FLT; 00285 00286 if (avctx->extradata_size >= 18) { 00287 s->decode_flags = AV_RL16(edata_ptr+14); 00288 channel_mask = AV_RL32(edata_ptr+2); 00289 s->bits_per_sample = AV_RL16(edata_ptr); 00291 for (i = 0; i < avctx->extradata_size; i++) 00292 av_dlog(avctx, "[%x] ", avctx->extradata[i]); 00293 av_dlog(avctx, "\n"); 00294 00295 } else { 00296 av_log_ask_for_sample(avctx, "Unknown extradata size\n"); 00297 return AVERROR_INVALIDDATA; 00298 } 00299 00301 s->log2_frame_size = av_log2(avctx->block_align) + 4; 00302 00304 s->skip_frame = 1; /* skip first frame */ 00305 s->packet_loss = 1; 00306 s->len_prefix = (s->decode_flags & 0x40); 00307 00309 s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate, 00310 3, s->decode_flags); 00311 00313 log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3); 00314 s->max_num_subframes = 1 << log2_max_num_subframes; 00315 if (s->max_num_subframes == 16 || s->max_num_subframes == 4) 00316 s->max_subframe_len_bit = 1; 00317 s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1; 00318 00319 num_possible_block_sizes = log2_max_num_subframes + 1; 00320 s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes; 00321 s->dynamic_range_compression = (s->decode_flags & 0x80); 00322 00323 if (s->max_num_subframes > MAX_SUBFRAMES) { 00324 av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n", 00325 s->max_num_subframes); 00326 return AVERROR_INVALIDDATA; 00327 } 00328 00329 s->num_channels = avctx->channels; 00330 00331 if (s->num_channels < 0) { 00332 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels); 00333 return AVERROR_INVALIDDATA; 00334 } else if (s->num_channels > WMAPRO_MAX_CHANNELS) { 00335 av_log_ask_for_sample(avctx, "unsupported number of channels\n"); 00336 return AVERROR_PATCHWELCOME; 00337 } 00338 00340 for (i = 0; i < s->num_channels; i++) 00341 s->channel[i].prev_block_len = s->samples_per_frame; 00342 00344 s->lfe_channel = -1; 00345 00346 if (channel_mask & 8) { 00347 unsigned int mask; 00348 for (mask = 1; mask < 16; mask <<= 1) { 00349 if (channel_mask & mask) 00350 ++s->lfe_channel; 00351 } 00352 } 00353 00354 INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE, 00355 scale_huffbits, 1, 1, 00356 scale_huffcodes, 2, 2, 616); 00357 00358 INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE, 00359 scale_rl_huffbits, 1, 1, 00360 scale_rl_huffcodes, 4, 4, 1406); 00361 00362 INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE, 00363 coef0_huffbits, 1, 1, 00364 coef0_huffcodes, 4, 4, 2108); 00365 00366 INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE, 00367 coef1_huffbits, 1, 1, 00368 coef1_huffcodes, 4, 4, 3912); 00369 00370 INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE, 00371 vec4_huffbits, 1, 1, 00372 vec4_huffcodes, 2, 2, 604); 00373 00374 INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE, 00375 vec2_huffbits, 1, 1, 00376 vec2_huffcodes, 2, 2, 562); 00377 00378 INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE, 00379 vec1_huffbits, 1, 1, 00380 vec1_huffcodes, 2, 2, 562); 00381 00384 for (i = 0; i < num_possible_block_sizes; i++) { 00385 int subframe_len = s->samples_per_frame >> i; 00386 int x; 00387 int band = 1; 00388 00389 s->sfb_offsets[i][0] = 0; 00390 00391 for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) { 00392 int offset = (subframe_len * 2 * critical_freq[x]) 00393 / s->avctx->sample_rate + 2; 00394 offset &= ~3; 00395 if (offset > s->sfb_offsets[i][band - 1]) 00396 s->sfb_offsets[i][band++] = offset; 00397 } 00398 s->sfb_offsets[i][band - 1] = subframe_len; 00399 s->num_sfb[i] = band - 1; 00400 } 00401 00402 00408 for (i = 0; i < num_possible_block_sizes; i++) { 00409 int b; 00410 for (b = 0; b < s->num_sfb[i]; b++) { 00411 int x; 00412 int offset = ((s->sfb_offsets[i][b] 00413 + s->sfb_offsets[i][b + 1] - 1) << i) >> 1; 00414 for (x = 0; x < num_possible_block_sizes; x++) { 00415 int v = 0; 00416 while (s->sfb_offsets[x][v + 1] << x < offset) 00417 ++v; 00418 s->sf_offsets[i][x][b] = v; 00419 } 00420 } 00421 } 00422 00424 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) 00425 ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1, 00426 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1)) 00427 / (1 << (s->bits_per_sample - 1))); 00428 00430 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) { 00431 const int win_idx = WMAPRO_BLOCK_MAX_BITS - i; 00432 ff_init_ff_sine_windows(win_idx); 00433 s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx]; 00434 } 00435 00437 for (i = 0; i < num_possible_block_sizes; i++) { 00438 int block_size = s->samples_per_frame >> i; 00439 int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1) 00440 / s->avctx->sample_rate; 00441 s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size); 00442 } 00443 00445 for (i = 0; i < 33; i++) 00446 sin64[i] = sin(i*M_PI / 64.0); 00447 00448 if (avctx->debug & FF_DEBUG_BITSTREAM) 00449 dump_context(s); 00450 00451 avctx->channel_layout = channel_mask; 00452 return 0; 00453 } 00454 00461 static int decode_subframe_length(WMAProDecodeCtx *s, int offset) 00462 { 00463 int frame_len_shift = 0; 00464 int subframe_len; 00465 00467 if (offset == s->samples_per_frame - s->min_samples_per_subframe) 00468 return s->min_samples_per_subframe; 00469 00471 if (s->max_subframe_len_bit) { 00472 if (get_bits1(&s->gb)) 00473 frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1); 00474 } else 00475 frame_len_shift = get_bits(&s->gb, s->subframe_len_bits); 00476 00477 subframe_len = s->samples_per_frame >> frame_len_shift; 00478 00480 if (subframe_len < s->min_samples_per_subframe || 00481 subframe_len > s->samples_per_frame) { 00482 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n", 00483 subframe_len); 00484 return AVERROR_INVALIDDATA; 00485 } 00486 return subframe_len; 00487 } 00488 00509 static int decode_tilehdr(WMAProDecodeCtx *s) 00510 { 00511 uint16_t num_samples[WMAPRO_MAX_CHANNELS]; 00512 uint8_t contains_subframe[WMAPRO_MAX_CHANNELS]; 00513 int channels_for_cur_subframe = s->num_channels; 00514 int fixed_channel_layout = 0; 00515 int min_channel_len = 0; 00516 int c; 00517 00518 /* Should never consume more than 3073 bits (256 iterations for the 00519 * while loop when always the minimum amount of 128 samples is substracted 00520 * from missing samples in the 8 channel case). 00521 * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4) 00522 */ 00523 00525 for (c = 0; c < s->num_channels; c++) 00526 s->channel[c].num_subframes = 0; 00527 00528 memset(num_samples, 0, sizeof(num_samples)); 00529 00530 if (s->max_num_subframes == 1 || get_bits1(&s->gb)) 00531 fixed_channel_layout = 1; 00532 00534 do { 00535 int subframe_len; 00536 00538 for (c = 0; c < s->num_channels; c++) { 00539 if (num_samples[c] == min_channel_len) { 00540 if (fixed_channel_layout || channels_for_cur_subframe == 1 || 00541 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe)) 00542 contains_subframe[c] = 1; 00543 else 00544 contains_subframe[c] = get_bits1(&s->gb); 00545 } else 00546 contains_subframe[c] = 0; 00547 } 00548 00550 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0) 00551 return AVERROR_INVALIDDATA; 00552 00554 min_channel_len += subframe_len; 00555 for (c = 0; c < s->num_channels; c++) { 00556 WMAProChannelCtx* chan = &s->channel[c]; 00557 00558 if (contains_subframe[c]) { 00559 if (chan->num_subframes >= MAX_SUBFRAMES) { 00560 av_log(s->avctx, AV_LOG_ERROR, 00561 "broken frame: num subframes > 31\n"); 00562 return AVERROR_INVALIDDATA; 00563 } 00564 chan->subframe_len[chan->num_subframes] = subframe_len; 00565 num_samples[c] += subframe_len; 00566 ++chan->num_subframes; 00567 if (num_samples[c] > s->samples_per_frame) { 00568 av_log(s->avctx, AV_LOG_ERROR, "broken frame: " 00569 "channel len > samples_per_frame\n"); 00570 return AVERROR_INVALIDDATA; 00571 } 00572 } else if (num_samples[c] <= min_channel_len) { 00573 if (num_samples[c] < min_channel_len) { 00574 channels_for_cur_subframe = 0; 00575 min_channel_len = num_samples[c]; 00576 } 00577 ++channels_for_cur_subframe; 00578 } 00579 } 00580 } while (min_channel_len < s->samples_per_frame); 00581 00582 for (c = 0; c < s->num_channels; c++) { 00583 int i; 00584 int offset = 0; 00585 for (i = 0; i < s->channel[c].num_subframes; i++) { 00586 av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]" 00587 " len %i\n", s->frame_num, c, i, 00588 s->channel[c].subframe_len[i]); 00589 s->channel[c].subframe_offset[i] = offset; 00590 offset += s->channel[c].subframe_len[i]; 00591 } 00592 } 00593 00594 return 0; 00595 } 00596 00602 static void decode_decorrelation_matrix(WMAProDecodeCtx *s, 00603 WMAProChannelGrp *chgroup) 00604 { 00605 int i; 00606 int offset = 0; 00607 int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS]; 00608 memset(chgroup->decorrelation_matrix, 0, s->num_channels * 00609 s->num_channels * sizeof(*chgroup->decorrelation_matrix)); 00610 00611 for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++) 00612 rotation_offset[i] = get_bits(&s->gb, 6); 00613 00614 for (i = 0; i < chgroup->num_channels; i++) 00615 chgroup->decorrelation_matrix[chgroup->num_channels * i + i] = 00616 get_bits1(&s->gb) ? 1.0 : -1.0; 00617 00618 for (i = 1; i < chgroup->num_channels; i++) { 00619 int x; 00620 for (x = 0; x < i; x++) { 00621 int y; 00622 for (y = 0; y < i + 1; y++) { 00623 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y]; 00624 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y]; 00625 int n = rotation_offset[offset + x]; 00626 float sinv; 00627 float cosv; 00628 00629 if (n < 32) { 00630 sinv = sin64[n]; 00631 cosv = sin64[32 - n]; 00632 } else { 00633 sinv = sin64[64 - n]; 00634 cosv = -sin64[n - 32]; 00635 } 00636 00637 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] = 00638 (v1 * sinv) - (v2 * cosv); 00639 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] = 00640 (v1 * cosv) + (v2 * sinv); 00641 } 00642 } 00643 offset += i; 00644 } 00645 } 00646 00652 static int decode_channel_transform(WMAProDecodeCtx* s) 00653 { 00654 int i; 00655 /* should never consume more than 1921 bits for the 8 channel case 00656 * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS 00657 * + MAX_CHANNELS + MAX_BANDS + 1) 00658 */ 00659 00661 s->num_chgroups = 0; 00662 if (s->num_channels > 1) { 00663 int remaining_channels = s->channels_for_cur_subframe; 00664 00665 if (get_bits1(&s->gb)) { 00666 av_log_ask_for_sample(s->avctx, 00667 "unsupported channel transform bit\n"); 00668 return AVERROR_INVALIDDATA; 00669 } 00670 00671 for (s->num_chgroups = 0; remaining_channels && 00672 s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) { 00673 WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups]; 00674 float** channel_data = chgroup->channel_data; 00675 chgroup->num_channels = 0; 00676 chgroup->transform = 0; 00677 00679 if (remaining_channels > 2) { 00680 for (i = 0; i < s->channels_for_cur_subframe; i++) { 00681 int channel_idx = s->channel_indexes_for_cur_subframe[i]; 00682 if (!s->channel[channel_idx].grouped 00683 && get_bits1(&s->gb)) { 00684 ++chgroup->num_channels; 00685 s->channel[channel_idx].grouped = 1; 00686 *channel_data++ = s->channel[channel_idx].coeffs; 00687 } 00688 } 00689 } else { 00690 chgroup->num_channels = remaining_channels; 00691 for (i = 0; i < s->channels_for_cur_subframe; i++) { 00692 int channel_idx = s->channel_indexes_for_cur_subframe[i]; 00693 if (!s->channel[channel_idx].grouped) 00694 *channel_data++ = s->channel[channel_idx].coeffs; 00695 s->channel[channel_idx].grouped = 1; 00696 } 00697 } 00698 00700 if (chgroup->num_channels == 2) { 00701 if (get_bits1(&s->gb)) { 00702 if (get_bits1(&s->gb)) { 00703 av_log_ask_for_sample(s->avctx, 00704 "unsupported channel transform type\n"); 00705 } 00706 } else { 00707 chgroup->transform = 1; 00708 if (s->num_channels == 2) { 00709 chgroup->decorrelation_matrix[0] = 1.0; 00710 chgroup->decorrelation_matrix[1] = -1.0; 00711 chgroup->decorrelation_matrix[2] = 1.0; 00712 chgroup->decorrelation_matrix[3] = 1.0; 00713 } else { 00715 chgroup->decorrelation_matrix[0] = 0.70703125; 00716 chgroup->decorrelation_matrix[1] = -0.70703125; 00717 chgroup->decorrelation_matrix[2] = 0.70703125; 00718 chgroup->decorrelation_matrix[3] = 0.70703125; 00719 } 00720 } 00721 } else if (chgroup->num_channels > 2) { 00722 if (get_bits1(&s->gb)) { 00723 chgroup->transform = 1; 00724 if (get_bits1(&s->gb)) { 00725 decode_decorrelation_matrix(s, chgroup); 00726 } else { 00728 if (chgroup->num_channels > 6) { 00729 av_log_ask_for_sample(s->avctx, 00730 "coupled channels > 6\n"); 00731 } else { 00732 memcpy(chgroup->decorrelation_matrix, 00733 default_decorrelation[chgroup->num_channels], 00734 chgroup->num_channels * chgroup->num_channels * 00735 sizeof(*chgroup->decorrelation_matrix)); 00736 } 00737 } 00738 } 00739 } 00740 00742 if (chgroup->transform) { 00743 if (!get_bits1(&s->gb)) { 00744 int i; 00746 for (i = 0; i < s->num_bands; i++) { 00747 chgroup->transform_band[i] = get_bits1(&s->gb); 00748 } 00749 } else { 00750 memset(chgroup->transform_band, 1, s->num_bands); 00751 } 00752 } 00753 remaining_channels -= chgroup->num_channels; 00754 } 00755 } 00756 return 0; 00757 } 00758 00765 static int decode_coeffs(WMAProDecodeCtx *s, int c) 00766 { 00767 /* Integers 0..15 as single-precision floats. The table saves a 00768 costly int to float conversion, and storing the values as 00769 integers allows fast sign-flipping. */ 00770 static const int fval_tab[16] = { 00771 0x00000000, 0x3f800000, 0x40000000, 0x40400000, 00772 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000, 00773 0x41000000, 0x41100000, 0x41200000, 0x41300000, 00774 0x41400000, 0x41500000, 0x41600000, 0x41700000, 00775 }; 00776 int vlctable; 00777 VLC* vlc; 00778 WMAProChannelCtx* ci = &s->channel[c]; 00779 int rl_mode = 0; 00780 int cur_coeff = 0; 00781 int num_zeros = 0; 00782 const uint16_t* run; 00783 const float* level; 00784 00785 av_dlog(s->avctx, "decode coefficients for channel %i\n", c); 00786 00787 vlctable = get_bits1(&s->gb); 00788 vlc = &coef_vlc[vlctable]; 00789 00790 if (vlctable) { 00791 run = coef1_run; 00792 level = coef1_level; 00793 } else { 00794 run = coef0_run; 00795 level = coef0_level; 00796 } 00797 00800 while ((s->transmit_num_vec_coeffs || !rl_mode) && 00801 (cur_coeff + 3 < ci->num_vec_coeffs)) { 00802 int vals[4]; 00803 int i; 00804 unsigned int idx; 00805 00806 idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH); 00807 00808 if (idx == HUFF_VEC4_SIZE - 1) { 00809 for (i = 0; i < 4; i += 2) { 00810 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH); 00811 if (idx == HUFF_VEC2_SIZE - 1) { 00812 int v0, v1; 00813 v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH); 00814 if (v0 == HUFF_VEC1_SIZE - 1) 00815 v0 += ff_wma_get_large_val(&s->gb); 00816 v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH); 00817 if (v1 == HUFF_VEC1_SIZE - 1) 00818 v1 += ff_wma_get_large_val(&s->gb); 00819 ((float*)vals)[i ] = v0; 00820 ((float*)vals)[i+1] = v1; 00821 } else { 00822 vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ]; 00823 vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF]; 00824 } 00825 } 00826 } else { 00827 vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ]; 00828 vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF]; 00829 vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF]; 00830 vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF]; 00831 } 00832 00834 for (i = 0; i < 4; i++) { 00835 if (vals[i]) { 00836 int sign = get_bits1(&s->gb) - 1; 00837 *(uint32_t*)&ci->coeffs[cur_coeff] = vals[i] ^ sign<<31; 00838 num_zeros = 0; 00839 } else { 00840 ci->coeffs[cur_coeff] = 0; 00843 rl_mode |= (++num_zeros > s->subframe_len >> 8); 00844 } 00845 ++cur_coeff; 00846 } 00847 } 00848 00850 if (cur_coeff < s->subframe_len) { 00851 memset(&ci->coeffs[cur_coeff], 0, 00852 sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff)); 00853 if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc, 00854 level, run, 1, ci->coeffs, 00855 cur_coeff, s->subframe_len, 00856 s->subframe_len, s->esc_len, 0)) 00857 return AVERROR_INVALIDDATA; 00858 } 00859 00860 return 0; 00861 } 00862 00868 static int decode_scale_factors(WMAProDecodeCtx* s) 00869 { 00870 int i; 00871 00876 for (i = 0; i < s->channels_for_cur_subframe; i++) { 00877 int c = s->channel_indexes_for_cur_subframe[i]; 00878 int* sf; 00879 int* sf_end; 00880 s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx]; 00881 sf_end = s->channel[c].scale_factors + s->num_bands; 00882 00888 if (s->channel[c].reuse_sf) { 00889 const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx]; 00890 int b; 00891 for (b = 0; b < s->num_bands; b++) 00892 s->channel[c].scale_factors[b] = 00893 s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++]; 00894 } 00895 00896 if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) { 00897 00898 if (!s->channel[c].reuse_sf) { 00899 int val; 00901 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1; 00902 val = 45 / s->channel[c].scale_factor_step; 00903 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) { 00904 val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60; 00905 *sf = val; 00906 } 00907 } else { 00908 int i; 00910 for (i = 0; i < s->num_bands; i++) { 00911 int idx; 00912 int skip; 00913 int val; 00914 int sign; 00915 00916 idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH); 00917 00918 if (!idx) { 00919 uint32_t code = get_bits(&s->gb, 14); 00920 val = code >> 6; 00921 sign = (code & 1) - 1; 00922 skip = (code & 0x3f) >> 1; 00923 } else if (idx == 1) { 00924 break; 00925 } else { 00926 skip = scale_rl_run[idx]; 00927 val = scale_rl_level[idx]; 00928 sign = get_bits1(&s->gb)-1; 00929 } 00930 00931 i += skip; 00932 if (i >= s->num_bands) { 00933 av_log(s->avctx, AV_LOG_ERROR, 00934 "invalid scale factor coding\n"); 00935 return AVERROR_INVALIDDATA; 00936 } 00937 s->channel[c].scale_factors[i] += (val ^ sign) - sign; 00938 } 00939 } 00941 s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx; 00942 s->channel[c].table_idx = s->table_idx; 00943 s->channel[c].reuse_sf = 1; 00944 } 00945 00947 s->channel[c].max_scale_factor = s->channel[c].scale_factors[0]; 00948 for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) { 00949 s->channel[c].max_scale_factor = 00950 FFMAX(s->channel[c].max_scale_factor, *sf); 00951 } 00952 00953 } 00954 return 0; 00955 } 00956 00961 static void inverse_channel_transform(WMAProDecodeCtx *s) 00962 { 00963 int i; 00964 00965 for (i = 0; i < s->num_chgroups; i++) { 00966 if (s->chgroup[i].transform) { 00967 float data[WMAPRO_MAX_CHANNELS]; 00968 const int num_channels = s->chgroup[i].num_channels; 00969 float** ch_data = s->chgroup[i].channel_data; 00970 float** ch_end = ch_data + num_channels; 00971 const int8_t* tb = s->chgroup[i].transform_band; 00972 int16_t* sfb; 00973 00975 for (sfb = s->cur_sfb_offsets; 00976 sfb < s->cur_sfb_offsets + s->num_bands; sfb++) { 00977 int y; 00978 if (*tb++ == 1) { 00980 for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) { 00981 const float* mat = s->chgroup[i].decorrelation_matrix; 00982 const float* data_end = data + num_channels; 00983 float* data_ptr = data; 00984 float** ch; 00985 00986 for (ch = ch_data; ch < ch_end; ch++) 00987 *data_ptr++ = (*ch)[y]; 00988 00989 for (ch = ch_data; ch < ch_end; ch++) { 00990 float sum = 0; 00991 data_ptr = data; 00992 while (data_ptr < data_end) 00993 sum += *data_ptr++ * *mat++; 00994 00995 (*ch)[y] = sum; 00996 } 00997 } 00998 } else if (s->num_channels == 2) { 00999 int len = FFMIN(sfb[1], s->subframe_len) - sfb[0]; 01000 s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0], 01001 ch_data[0] + sfb[0], 01002 181.0 / 128, len); 01003 s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0], 01004 ch_data[1] + sfb[0], 01005 181.0 / 128, len); 01006 } 01007 } 01008 } 01009 } 01010 } 01011 01016 static void wmapro_window(WMAProDecodeCtx *s) 01017 { 01018 int i; 01019 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01020 int c = s->channel_indexes_for_cur_subframe[i]; 01021 float* window; 01022 int winlen = s->channel[c].prev_block_len; 01023 float* start = s->channel[c].coeffs - (winlen >> 1); 01024 01025 if (s->subframe_len < winlen) { 01026 start += (winlen - s->subframe_len) >> 1; 01027 winlen = s->subframe_len; 01028 } 01029 01030 window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS]; 01031 01032 winlen >>= 1; 01033 01034 s->dsp.vector_fmul_window(start, start, start + winlen, 01035 window, winlen); 01036 01037 s->channel[c].prev_block_len = s->subframe_len; 01038 } 01039 } 01040 01046 static int decode_subframe(WMAProDecodeCtx *s) 01047 { 01048 int offset = s->samples_per_frame; 01049 int subframe_len = s->samples_per_frame; 01050 int i; 01051 int total_samples = s->samples_per_frame * s->num_channels; 01052 int transmit_coeffs = 0; 01053 int cur_subwoofer_cutoff; 01054 01055 s->subframe_offset = get_bits_count(&s->gb); 01056 01061 for (i = 0; i < s->num_channels; i++) { 01062 s->channel[i].grouped = 0; 01063 if (offset > s->channel[i].decoded_samples) { 01064 offset = s->channel[i].decoded_samples; 01065 subframe_len = 01066 s->channel[i].subframe_len[s->channel[i].cur_subframe]; 01067 } 01068 } 01069 01070 av_dlog(s->avctx, 01071 "processing subframe with offset %i len %i\n", offset, subframe_len); 01072 01074 s->channels_for_cur_subframe = 0; 01075 for (i = 0; i < s->num_channels; i++) { 01076 const int cur_subframe = s->channel[i].cur_subframe; 01078 total_samples -= s->channel[i].decoded_samples; 01079 01081 if (offset == s->channel[i].decoded_samples && 01082 subframe_len == s->channel[i].subframe_len[cur_subframe]) { 01083 total_samples -= s->channel[i].subframe_len[cur_subframe]; 01084 s->channel[i].decoded_samples += 01085 s->channel[i].subframe_len[cur_subframe]; 01086 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i; 01087 ++s->channels_for_cur_subframe; 01088 } 01089 } 01090 01093 if (!total_samples) 01094 s->parsed_all_subframes = 1; 01095 01096 01097 av_dlog(s->avctx, "subframe is part of %i channels\n", 01098 s->channels_for_cur_subframe); 01099 01101 s->table_idx = av_log2(s->samples_per_frame/subframe_len); 01102 s->num_bands = s->num_sfb[s->table_idx]; 01103 s->cur_sfb_offsets = s->sfb_offsets[s->table_idx]; 01104 cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx]; 01105 01107 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01108 int c = s->channel_indexes_for_cur_subframe[i]; 01109 01110 s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1) 01111 + offset]; 01112 } 01113 01114 s->subframe_len = subframe_len; 01115 s->esc_len = av_log2(s->subframe_len - 1) + 1; 01116 01118 if (get_bits1(&s->gb)) { 01119 int num_fill_bits; 01120 if (!(num_fill_bits = get_bits(&s->gb, 2))) { 01121 int len = get_bits(&s->gb, 4); 01122 num_fill_bits = get_bits(&s->gb, len) + 1; 01123 } 01124 01125 if (num_fill_bits >= 0) { 01126 if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) { 01127 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n"); 01128 return AVERROR_INVALIDDATA; 01129 } 01130 01131 skip_bits_long(&s->gb, num_fill_bits); 01132 } 01133 } 01134 01136 if (get_bits1(&s->gb)) { 01137 av_log_ask_for_sample(s->avctx, "reserved bit set\n"); 01138 return AVERROR_INVALIDDATA; 01139 } 01140 01141 01142 if (decode_channel_transform(s) < 0) 01143 return AVERROR_INVALIDDATA; 01144 01145 01146 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01147 int c = s->channel_indexes_for_cur_subframe[i]; 01148 if ((s->channel[c].transmit_coefs = get_bits1(&s->gb))) 01149 transmit_coeffs = 1; 01150 } 01151 01152 if (transmit_coeffs) { 01153 int step; 01154 int quant_step = 90 * s->bits_per_sample >> 4; 01155 01157 if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) { 01158 int num_bits = av_log2((s->subframe_len + 3)/4) + 1; 01159 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01160 int c = s->channel_indexes_for_cur_subframe[i]; 01161 int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2; 01162 if (num_vec_coeffs > WMAPRO_BLOCK_MAX_SIZE) { 01163 av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs); 01164 return AVERROR_INVALIDDATA; 01165 } 01166 s->channel[c].num_vec_coeffs = num_vec_coeffs; 01167 } 01168 } else { 01169 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01170 int c = s->channel_indexes_for_cur_subframe[i]; 01171 s->channel[c].num_vec_coeffs = s->subframe_len; 01172 } 01173 } 01175 step = get_sbits(&s->gb, 6); 01176 quant_step += step; 01177 if (step == -32 || step == 31) { 01178 const int sign = (step == 31) - 1; 01179 int quant = 0; 01180 while (get_bits_count(&s->gb) + 5 < s->num_saved_bits && 01181 (step = get_bits(&s->gb, 5)) == 31) { 01182 quant += 31; 01183 } 01184 quant_step += ((quant + step) ^ sign) - sign; 01185 } 01186 if (quant_step < 0) { 01187 av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n"); 01188 } 01189 01192 if (s->channels_for_cur_subframe == 1) { 01193 s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step; 01194 } else { 01195 int modifier_len = get_bits(&s->gb, 3); 01196 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01197 int c = s->channel_indexes_for_cur_subframe[i]; 01198 s->channel[c].quant_step = quant_step; 01199 if (get_bits1(&s->gb)) { 01200 if (modifier_len) { 01201 s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1; 01202 } else 01203 ++s->channel[c].quant_step; 01204 } 01205 } 01206 } 01207 01209 if (decode_scale_factors(s) < 0) 01210 return AVERROR_INVALIDDATA; 01211 } 01212 01213 av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n", 01214 get_bits_count(&s->gb) - s->subframe_offset); 01215 01217 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01218 int c = s->channel_indexes_for_cur_subframe[i]; 01219 if (s->channel[c].transmit_coefs && 01220 get_bits_count(&s->gb) < s->num_saved_bits) { 01221 decode_coeffs(s, c); 01222 } else 01223 memset(s->channel[c].coeffs, 0, 01224 sizeof(*s->channel[c].coeffs) * subframe_len); 01225 } 01226 01227 av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n", 01228 get_bits_count(&s->gb) - s->subframe_offset); 01229 01230 if (transmit_coeffs) { 01231 FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS]; 01233 inverse_channel_transform(s); 01234 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01235 int c = s->channel_indexes_for_cur_subframe[i]; 01236 const int* sf = s->channel[c].scale_factors; 01237 int b; 01238 01239 if (c == s->lfe_channel) 01240 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) * 01241 (subframe_len - cur_subwoofer_cutoff)); 01242 01244 for (b = 0; b < s->num_bands; b++) { 01245 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len); 01246 const int exp = s->channel[c].quant_step - 01247 (s->channel[c].max_scale_factor - *sf++) * 01248 s->channel[c].scale_factor_step; 01249 const float quant = pow(10.0, exp / 20.0); 01250 int start = s->cur_sfb_offsets[b]; 01251 s->dsp.vector_fmul_scalar(s->tmp + start, 01252 s->channel[c].coeffs + start, 01253 quant, end - start); 01254 } 01255 01257 mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp); 01258 } 01259 } 01260 01262 wmapro_window(s); 01263 01265 for (i = 0; i < s->channels_for_cur_subframe; i++) { 01266 int c = s->channel_indexes_for_cur_subframe[i]; 01267 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) { 01268 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n"); 01269 return AVERROR_INVALIDDATA; 01270 } 01271 ++s->channel[c].cur_subframe; 01272 } 01273 01274 return 0; 01275 } 01276 01283 static int decode_frame(WMAProDecodeCtx *s) 01284 { 01285 GetBitContext* gb = &s->gb; 01286 int more_frames = 0; 01287 int len = 0; 01288 int i; 01289 01291 if (s->num_channels * s->samples_per_frame > s->samples_end - s->samples) { 01293 av_log(s->avctx, AV_LOG_ERROR, 01294 "not enough space for the output samples\n"); 01295 s->packet_loss = 1; 01296 return 0; 01297 } 01298 01300 if (s->len_prefix) 01301 len = get_bits(gb, s->log2_frame_size); 01302 01303 av_dlog(s->avctx, "decoding frame with length %x\n", len); 01304 01306 if (decode_tilehdr(s)) { 01307 s->packet_loss = 1; 01308 return 0; 01309 } 01310 01312 if (s->num_channels > 1 && get_bits1(gb)) { 01313 if (get_bits1(gb)) { 01314 for (i = 0; i < s->num_channels * s->num_channels; i++) 01315 skip_bits(gb, 4); 01316 } 01317 } 01318 01320 if (s->dynamic_range_compression) { 01321 s->drc_gain = get_bits(gb, 8); 01322 av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain); 01323 } 01324 01327 if (get_bits1(gb)) { 01328 int av_unused skip; 01329 01331 if (get_bits1(gb)) { 01332 skip = get_bits(gb, av_log2(s->samples_per_frame * 2)); 01333 av_dlog(s->avctx, "start skip: %i\n", skip); 01334 } 01335 01337 if (get_bits1(gb)) { 01338 skip = get_bits(gb, av_log2(s->samples_per_frame * 2)); 01339 av_dlog(s->avctx, "end skip: %i\n", skip); 01340 } 01341 01342 } 01343 01344 av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n", 01345 get_bits_count(gb) - s->frame_offset); 01346 01348 s->parsed_all_subframes = 0; 01349 for (i = 0; i < s->num_channels; i++) { 01350 s->channel[i].decoded_samples = 0; 01351 s->channel[i].cur_subframe = 0; 01352 s->channel[i].reuse_sf = 0; 01353 } 01354 01356 while (!s->parsed_all_subframes) { 01357 if (decode_subframe(s) < 0) { 01358 s->packet_loss = 1; 01359 return 0; 01360 } 01361 } 01362 01364 for (i = 0; i < s->num_channels; i++) { 01365 float* ptr = s->samples + i; 01366 int incr = s->num_channels; 01367 float* iptr = s->channel[i].out; 01368 float* iend = iptr + s->samples_per_frame; 01369 01370 // FIXME should create/use a DSP function here 01371 while (iptr < iend) { 01372 *ptr = *iptr++; 01373 ptr += incr; 01374 } 01375 01377 memcpy(&s->channel[i].out[0], 01378 &s->channel[i].out[s->samples_per_frame], 01379 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1); 01380 } 01381 01382 if (s->skip_frame) { 01383 s->skip_frame = 0; 01384 } else 01385 s->samples += s->num_channels * s->samples_per_frame; 01386 01387 if (s->len_prefix) { 01388 if (len != (get_bits_count(gb) - s->frame_offset) + 2) { 01390 av_log(s->avctx, AV_LOG_ERROR, 01391 "frame[%i] would have to skip %i bits\n", s->frame_num, 01392 len - (get_bits_count(gb) - s->frame_offset) - 1); 01393 s->packet_loss = 1; 01394 return 0; 01395 } 01396 01398 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1); 01399 } else { 01400 while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) { 01401 } 01402 } 01403 01405 more_frames = get_bits1(gb); 01406 01407 ++s->frame_num; 01408 return more_frames; 01409 } 01410 01417 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb) 01418 { 01419 return s->buf_bit_size - get_bits_count(gb); 01420 } 01421 01429 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len, 01430 int append) 01431 { 01432 int buflen; 01433 01438 if (!append) { 01439 s->frame_offset = get_bits_count(gb) & 7; 01440 s->num_saved_bits = s->frame_offset; 01441 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE); 01442 } 01443 01444 buflen = (s->num_saved_bits + len + 8) >> 3; 01445 01446 if (len <= 0 || buflen > MAX_FRAMESIZE) { 01447 av_log_ask_for_sample(s->avctx, "input buffer too small\n"); 01448 s->packet_loss = 1; 01449 return; 01450 } 01451 01452 s->num_saved_bits += len; 01453 if (!append) { 01454 ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), 01455 s->num_saved_bits); 01456 } else { 01457 int align = 8 - (get_bits_count(gb) & 7); 01458 align = FFMIN(align, len); 01459 put_bits(&s->pb, align, get_bits(gb, align)); 01460 len -= align; 01461 ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len); 01462 } 01463 skip_bits_long(gb, len); 01464 01465 { 01466 PutBitContext tmp = s->pb; 01467 flush_put_bits(&tmp); 01468 } 01469 01470 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits); 01471 skip_bits(&s->gb, s->frame_offset); 01472 } 01473 01482 static int decode_packet(AVCodecContext *avctx, 01483 void *data, int *data_size, AVPacket* avpkt) 01484 { 01485 WMAProDecodeCtx *s = avctx->priv_data; 01486 GetBitContext* gb = &s->pgb; 01487 const uint8_t* buf = avpkt->data; 01488 int buf_size = avpkt->size; 01489 int num_bits_prev_frame; 01490 int packet_sequence_number; 01491 01492 s->samples = data; 01493 s->samples_end = (float*)((int8_t*)data + *data_size); 01494 *data_size = 0; 01495 01496 if (s->packet_done || s->packet_loss) { 01497 s->packet_done = 0; 01498 01500 if (buf_size < avctx->block_align) 01501 return 0; 01502 01503 s->next_packet_start = buf_size - avctx->block_align; 01504 buf_size = avctx->block_align; 01505 s->buf_bit_size = buf_size << 3; 01506 01508 init_get_bits(gb, buf, s->buf_bit_size); 01509 packet_sequence_number = get_bits(gb, 4); 01510 skip_bits(gb, 2); 01511 01513 num_bits_prev_frame = get_bits(gb, s->log2_frame_size); 01514 av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number, 01515 num_bits_prev_frame); 01516 01518 if (!s->packet_loss && 01519 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) { 01520 s->packet_loss = 1; 01521 av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n", 01522 s->packet_sequence_number, packet_sequence_number); 01523 } 01524 s->packet_sequence_number = packet_sequence_number; 01525 01526 if (num_bits_prev_frame > 0) { 01527 int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb); 01528 if (num_bits_prev_frame >= remaining_packet_bits) { 01529 num_bits_prev_frame = remaining_packet_bits; 01530 s->packet_done = 1; 01531 } 01532 01535 save_bits(s, gb, num_bits_prev_frame, 1); 01536 av_dlog(avctx, "accumulated %x bits of frame data\n", 01537 s->num_saved_bits - s->frame_offset); 01538 01540 if (!s->packet_loss) 01541 decode_frame(s); 01542 } else if (s->num_saved_bits - s->frame_offset) { 01543 av_dlog(avctx, "ignoring %x previously saved bits\n", 01544 s->num_saved_bits - s->frame_offset); 01545 } 01546 01547 if (s->packet_loss) { 01551 s->num_saved_bits = 0; 01552 s->packet_loss = 0; 01553 } 01554 01555 } else { 01556 int frame_size; 01557 s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3; 01558 init_get_bits(gb, avpkt->data, s->buf_bit_size); 01559 skip_bits(gb, s->packet_offset); 01560 if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size && 01561 (frame_size = show_bits(gb, s->log2_frame_size)) && 01562 frame_size <= remaining_bits(s, gb)) { 01563 save_bits(s, gb, frame_size, 0); 01564 s->packet_done = !decode_frame(s); 01565 } else if (!s->len_prefix 01566 && s->num_saved_bits > get_bits_count(&s->gb)) { 01574 s->packet_done = !decode_frame(s); 01575 } else 01576 s->packet_done = 1; 01577 } 01578 01579 if (s->packet_done && !s->packet_loss && 01580 remaining_bits(s, gb) > 0) { 01583 save_bits(s, gb, remaining_bits(s, gb), 0); 01584 } 01585 01586 *data_size = (int8_t *)s->samples - (int8_t *)data; 01587 s->packet_offset = get_bits_count(gb) & 7; 01588 01589 return (s->packet_loss) ? AVERROR_INVALIDDATA : get_bits_count(gb) >> 3; 01590 } 01591 01596 static void flush(AVCodecContext *avctx) 01597 { 01598 WMAProDecodeCtx *s = avctx->priv_data; 01599 int i; 01602 for (i = 0; i < s->num_channels; i++) 01603 memset(s->channel[i].out, 0, s->samples_per_frame * 01604 sizeof(*s->channel[i].out)); 01605 s->packet_loss = 1; 01606 } 01607 01608 01612 AVCodec ff_wmapro_decoder = { 01613 "wmapro", 01614 AVMEDIA_TYPE_AUDIO, 01615 CODEC_ID_WMAPRO, 01616 sizeof(WMAProDecodeCtx), 01617 decode_init, 01618 NULL, 01619 decode_end, 01620 decode_packet, 01621 .capabilities = CODEC_CAP_SUBFRAMES, 01622 .flush= flush, 01623 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"), 01624 };