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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 "wma.h"
00096
00098 #define WMAPRO_MAX_CHANNELS 8
00099 #define MAX_SUBFRAMES 32
00100 #define MAX_BANDS 29
00101 #define MAX_FRAMESIZE 32768
00102
00103 #define WMAPRO_BLOCK_MIN_BITS 6
00104 #define WMAPRO_BLOCK_MAX_BITS 12
00105 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS)
00106 #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1)
00107
00108
00109 #define VLCBITS 9
00110 #define SCALEVLCBITS 8
00111 #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS)
00112 #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS)
00113 #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS)
00114 #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS)
00115 #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS)
00116
00117 static VLC sf_vlc;
00118 static VLC sf_rl_vlc;
00119 static VLC vec4_vlc;
00120 static VLC vec2_vlc;
00121 static VLC vec1_vlc;
00122 static VLC coef_vlc[2];
00123 static float sin64[33];
00124
00128 typedef struct {
00129 int16_t prev_block_len;
00130 uint8_t transmit_coefs;
00131 uint8_t num_subframes;
00132 uint16_t subframe_len[MAX_SUBFRAMES];
00133 uint16_t subframe_offset[MAX_SUBFRAMES];
00134 uint8_t cur_subframe;
00135 uint16_t decoded_samples;
00136 uint8_t grouped;
00137 int quant_step;
00138 int8_t reuse_sf;
00139 int8_t scale_factor_step;
00140 int max_scale_factor;
00141 int saved_scale_factors[2][MAX_BANDS];
00142 int8_t scale_factor_idx;
00143 int* scale_factors;
00144 uint8_t table_idx;
00145 float* coeffs;
00146 uint16_t num_vec_coeffs;
00147 DECLARE_ALIGNED(16, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2];
00148 } WMAProChannelCtx;
00149
00153 typedef struct {
00154 uint8_t num_channels;
00155 int8_t transform;
00156 int8_t transform_band[MAX_BANDS];
00157 float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS];
00158 float* channel_data[WMAPRO_MAX_CHANNELS];
00159 } WMAProChannelGrp;
00160
00164 typedef struct WMAProDecodeCtx {
00165
00166 AVCodecContext* avctx;
00167 DSPContext dsp;
00168 uint8_t frame_data[MAX_FRAMESIZE +
00169 FF_INPUT_BUFFER_PADDING_SIZE];
00170 PutBitContext pb;
00171 FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES];
00172 DECLARE_ALIGNED(16, float, tmp)[WMAPRO_BLOCK_MAX_SIZE];
00173 float* windows[WMAPRO_BLOCK_SIZES];
00174
00175
00176 uint32_t decode_flags;
00177 uint8_t len_prefix;
00178 uint8_t dynamic_range_compression;
00179 uint8_t bits_per_sample;
00180 uint16_t samples_per_frame;
00181 uint16_t log2_frame_size;
00182 int8_t num_channels;
00183 int8_t lfe_channel;
00184 uint8_t max_num_subframes;
00185 uint8_t subframe_len_bits;
00186 uint8_t max_subframe_len_bit;
00187 uint16_t min_samples_per_subframe;
00188 int8_t num_sfb[WMAPRO_BLOCK_SIZES];
00189 int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS];
00190 int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS];
00191 int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES];
00192
00193
00194 GetBitContext pgb;
00195 int next_packet_start;
00196 uint8_t packet_offset;
00197 uint8_t packet_sequence_number;
00198 int num_saved_bits;
00199 int frame_offset;
00200 int subframe_offset;
00201 uint8_t packet_loss;
00202 uint8_t packet_done;
00203
00204
00205 uint32_t frame_num;
00206 GetBitContext gb;
00207 int buf_bit_size;
00208 float* samples;
00209 float* samples_end;
00210 uint8_t drc_gain;
00211 int8_t skip_frame;
00212 int8_t parsed_all_subframes;
00213
00214
00215 int16_t subframe_len;
00216 int8_t channels_for_cur_subframe;
00217 int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS];
00218 int8_t num_bands;
00219 int8_t transmit_num_vec_coeffs;
00220 int16_t* cur_sfb_offsets;
00221 uint8_t table_idx;
00222 int8_t esc_len;
00223
00224 uint8_t num_chgroups;
00225 WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS];
00226
00227 WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS];
00228 } WMAProDecodeCtx;
00229
00230
00235 static void av_cold dump_context(WMAProDecodeCtx *s)
00236 {
00237 #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
00238 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b);
00239
00240 PRINT("ed sample bit depth", s->bits_per_sample);
00241 PRINT_HEX("ed decode flags", s->decode_flags);
00242 PRINT("samples per frame", s->samples_per_frame);
00243 PRINT("log2 frame size", s->log2_frame_size);
00244 PRINT("max num subframes", s->max_num_subframes);
00245 PRINT("len prefix", s->len_prefix);
00246 PRINT("num channels", s->num_channels);
00247 }
00248
00254 static av_cold int decode_end(AVCodecContext *avctx)
00255 {
00256 WMAProDecodeCtx *s = avctx->priv_data;
00257 int i;
00258
00259 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00260 ff_mdct_end(&s->mdct_ctx[i]);
00261
00262 return 0;
00263 }
00264
00270 static av_cold int decode_init(AVCodecContext *avctx)
00271 {
00272 WMAProDecodeCtx *s = avctx->priv_data;
00273 uint8_t *edata_ptr = avctx->extradata;
00274 unsigned int channel_mask;
00275 int i;
00276 int log2_max_num_subframes;
00277 int num_possible_block_sizes;
00278
00279 s->avctx = avctx;
00280 dsputil_init(&s->dsp, avctx);
00281 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
00282
00283 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
00284
00285 if (avctx->extradata_size >= 18) {
00286 s->decode_flags = AV_RL16(edata_ptr+14);
00287 channel_mask = AV_RL32(edata_ptr+2);
00288 s->bits_per_sample = AV_RL16(edata_ptr);
00290 for (i = 0; i < avctx->extradata_size; i++)
00291 av_dlog(avctx, "[%x] ", avctx->extradata[i]);
00292 av_dlog(avctx, "\n");
00293
00294 } else {
00295 av_log_ask_for_sample(avctx, "Unknown extradata size\n");
00296 return AVERROR_INVALIDDATA;
00297 }
00298
00300 s->log2_frame_size = av_log2(avctx->block_align) + 4;
00301
00303 s->skip_frame = 1;
00304 s->packet_loss = 1;
00305 s->len_prefix = (s->decode_flags & 0x40);
00306
00308 s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
00309 3, s->decode_flags);
00310
00312 for (i = 0; i < avctx->channels; i++)
00313 s->channel[i].prev_block_len = s->samples_per_frame;
00314
00316 log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
00317 s->max_num_subframes = 1 << log2_max_num_subframes;
00318 if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
00319 s->max_subframe_len_bit = 1;
00320 s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
00321
00322 num_possible_block_sizes = log2_max_num_subframes + 1;
00323 s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
00324 s->dynamic_range_compression = (s->decode_flags & 0x80);
00325
00326 if (s->max_num_subframes > MAX_SUBFRAMES) {
00327 av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n",
00328 s->max_num_subframes);
00329 return AVERROR_INVALIDDATA;
00330 }
00331
00332 s->num_channels = avctx->channels;
00333
00335 s->lfe_channel = -1;
00336
00337 if (channel_mask & 8) {
00338 unsigned int mask;
00339 for (mask = 1; mask < 16; mask <<= 1) {
00340 if (channel_mask & mask)
00341 ++s->lfe_channel;
00342 }
00343 }
00344
00345 if (s->num_channels < 0) {
00346 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
00347 return AVERROR_INVALIDDATA;
00348 } else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
00349 av_log_ask_for_sample(avctx, "unsupported number of channels\n");
00350 return AVERROR_PATCHWELCOME;
00351 }
00352
00353 INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
00354 scale_huffbits, 1, 1,
00355 scale_huffcodes, 2, 2, 616);
00356
00357 INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
00358 scale_rl_huffbits, 1, 1,
00359 scale_rl_huffcodes, 4, 4, 1406);
00360
00361 INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
00362 coef0_huffbits, 1, 1,
00363 coef0_huffcodes, 4, 4, 2108);
00364
00365 INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
00366 coef1_huffbits, 1, 1,
00367 coef1_huffcodes, 4, 4, 3912);
00368
00369 INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
00370 vec4_huffbits, 1, 1,
00371 vec4_huffcodes, 2, 2, 604);
00372
00373 INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
00374 vec2_huffbits, 1, 1,
00375 vec2_huffcodes, 2, 2, 562);
00376
00377 INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
00378 vec1_huffbits, 1, 1,
00379 vec1_huffcodes, 2, 2, 562);
00380
00383 for (i = 0; i < num_possible_block_sizes; i++) {
00384 int subframe_len = s->samples_per_frame >> i;
00385 int x;
00386 int band = 1;
00387
00388 s->sfb_offsets[i][0] = 0;
00389
00390 for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
00391 int offset = (subframe_len * 2 * critical_freq[x])
00392 / s->avctx->sample_rate + 2;
00393 offset &= ~3;
00394 if (offset > s->sfb_offsets[i][band - 1])
00395 s->sfb_offsets[i][band++] = offset;
00396 }
00397 s->sfb_offsets[i][band - 1] = subframe_len;
00398 s->num_sfb[i] = band - 1;
00399 }
00400
00401
00407 for (i = 0; i < num_possible_block_sizes; i++) {
00408 int b;
00409 for (b = 0; b < s->num_sfb[i]; b++) {
00410 int x;
00411 int offset = ((s->sfb_offsets[i][b]
00412 + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
00413 for (x = 0; x < num_possible_block_sizes; x++) {
00414 int v = 0;
00415 while (s->sfb_offsets[x][v + 1] << x < offset)
00416 ++v;
00417 s->sf_offsets[i][x][b] = v;
00418 }
00419 }
00420 }
00421
00423 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00424 ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
00425 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
00426 / (1 << (s->bits_per_sample - 1)));
00427
00429 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
00430 const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
00431 ff_init_ff_sine_windows(win_idx);
00432 s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
00433 }
00434
00436 for (i = 0; i < num_possible_block_sizes; i++) {
00437 int block_size = s->samples_per_frame >> i;
00438 int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
00439 / s->avctx->sample_rate;
00440 s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
00441 }
00442
00444 for (i = 0; i < 33; i++)
00445 sin64[i] = sin(i*M_PI / 64.0);
00446
00447 if (avctx->debug & FF_DEBUG_BITSTREAM)
00448 dump_context(s);
00449
00450 avctx->channel_layout = channel_mask;
00451 return 0;
00452 }
00453
00460 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
00461 {
00462 int frame_len_shift = 0;
00463 int subframe_len;
00464
00466 if (offset == s->samples_per_frame - s->min_samples_per_subframe)
00467 return s->min_samples_per_subframe;
00468
00470 if (s->max_subframe_len_bit) {
00471 if (get_bits1(&s->gb))
00472 frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
00473 } else
00474 frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
00475
00476 subframe_len = s->samples_per_frame >> frame_len_shift;
00477
00479 if (subframe_len < s->min_samples_per_subframe ||
00480 subframe_len > s->samples_per_frame) {
00481 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
00482 subframe_len);
00483 return AVERROR_INVALIDDATA;
00484 }
00485 return subframe_len;
00486 }
00487
00508 static int decode_tilehdr(WMAProDecodeCtx *s)
00509 {
00510 uint16_t num_samples[WMAPRO_MAX_CHANNELS];
00511 uint8_t contains_subframe[WMAPRO_MAX_CHANNELS];
00512 int channels_for_cur_subframe = s->num_channels;
00513 int fixed_channel_layout = 0;
00514 int min_channel_len = 0;
00515 int c;
00516
00517
00518
00519
00520
00521
00522
00524 for (c = 0; c < s->num_channels; c++)
00525 s->channel[c].num_subframes = 0;
00526
00527 memset(num_samples, 0, sizeof(num_samples));
00528
00529 if (s->max_num_subframes == 1 || get_bits1(&s->gb))
00530 fixed_channel_layout = 1;
00531
00533 do {
00534 int subframe_len;
00535
00537 for (c = 0; c < s->num_channels; c++) {
00538 if (num_samples[c] == min_channel_len) {
00539 if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
00540 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
00541 contains_subframe[c] = 1;
00542 else
00543 contains_subframe[c] = get_bits1(&s->gb);
00544 } else
00545 contains_subframe[c] = 0;
00546 }
00547
00549 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
00550 return AVERROR_INVALIDDATA;
00551
00553 min_channel_len += subframe_len;
00554 for (c = 0; c < s->num_channels; c++) {
00555 WMAProChannelCtx* chan = &s->channel[c];
00556
00557 if (contains_subframe[c]) {
00558 if (chan->num_subframes >= MAX_SUBFRAMES) {
00559 av_log(s->avctx, AV_LOG_ERROR,
00560 "broken frame: num subframes > 31\n");
00561 return AVERROR_INVALIDDATA;
00562 }
00563 chan->subframe_len[chan->num_subframes] = subframe_len;
00564 num_samples[c] += subframe_len;
00565 ++chan->num_subframes;
00566 if (num_samples[c] > s->samples_per_frame) {
00567 av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
00568 "channel len > samples_per_frame\n");
00569 return AVERROR_INVALIDDATA;
00570 }
00571 } else if (num_samples[c] <= min_channel_len) {
00572 if (num_samples[c] < min_channel_len) {
00573 channels_for_cur_subframe = 0;
00574 min_channel_len = num_samples[c];
00575 }
00576 ++channels_for_cur_subframe;
00577 }
00578 }
00579 } while (min_channel_len < s->samples_per_frame);
00580
00581 for (c = 0; c < s->num_channels; c++) {
00582 int i;
00583 int offset = 0;
00584 for (i = 0; i < s->channel[c].num_subframes; i++) {
00585 av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
00586 " len %i\n", s->frame_num, c, i,
00587 s->channel[c].subframe_len[i]);
00588 s->channel[c].subframe_offset[i] = offset;
00589 offset += s->channel[c].subframe_len[i];
00590 }
00591 }
00592
00593 return 0;
00594 }
00595
00601 static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
00602 WMAProChannelGrp *chgroup)
00603 {
00604 int i;
00605 int offset = 0;
00606 int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
00607 memset(chgroup->decorrelation_matrix, 0, s->num_channels *
00608 s->num_channels * sizeof(*chgroup->decorrelation_matrix));
00609
00610 for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
00611 rotation_offset[i] = get_bits(&s->gb, 6);
00612
00613 for (i = 0; i < chgroup->num_channels; i++)
00614 chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
00615 get_bits1(&s->gb) ? 1.0 : -1.0;
00616
00617 for (i = 1; i < chgroup->num_channels; i++) {
00618 int x;
00619 for (x = 0; x < i; x++) {
00620 int y;
00621 for (y = 0; y < i + 1; y++) {
00622 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
00623 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
00624 int n = rotation_offset[offset + x];
00625 float sinv;
00626 float cosv;
00627
00628 if (n < 32) {
00629 sinv = sin64[n];
00630 cosv = sin64[32 - n];
00631 } else {
00632 sinv = sin64[64 - n];
00633 cosv = -sin64[n - 32];
00634 }
00635
00636 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
00637 (v1 * sinv) - (v2 * cosv);
00638 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
00639 (v1 * cosv) + (v2 * sinv);
00640 }
00641 }
00642 offset += i;
00643 }
00644 }
00645
00651 static int decode_channel_transform(WMAProDecodeCtx* s)
00652 {
00653 int i;
00654
00655
00656
00657
00658
00660 s->num_chgroups = 0;
00661 if (s->num_channels > 1) {
00662 int remaining_channels = s->channels_for_cur_subframe;
00663
00664 if (get_bits1(&s->gb)) {
00665 av_log_ask_for_sample(s->avctx,
00666 "unsupported channel transform bit\n");
00667 return AVERROR_INVALIDDATA;
00668 }
00669
00670 for (s->num_chgroups = 0; remaining_channels &&
00671 s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
00672 WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
00673 float** channel_data = chgroup->channel_data;
00674 chgroup->num_channels = 0;
00675 chgroup->transform = 0;
00676
00678 if (remaining_channels > 2) {
00679 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00680 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00681 if (!s->channel[channel_idx].grouped
00682 && get_bits1(&s->gb)) {
00683 ++chgroup->num_channels;
00684 s->channel[channel_idx].grouped = 1;
00685 *channel_data++ = s->channel[channel_idx].coeffs;
00686 }
00687 }
00688 } else {
00689 chgroup->num_channels = remaining_channels;
00690 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00691 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00692 if (!s->channel[channel_idx].grouped)
00693 *channel_data++ = s->channel[channel_idx].coeffs;
00694 s->channel[channel_idx].grouped = 1;
00695 }
00696 }
00697
00699 if (chgroup->num_channels == 2) {
00700 if (get_bits1(&s->gb)) {
00701 if (get_bits1(&s->gb)) {
00702 av_log_ask_for_sample(s->avctx,
00703 "unsupported channel transform type\n");
00704 }
00705 } else {
00706 chgroup->transform = 1;
00707 if (s->num_channels == 2) {
00708 chgroup->decorrelation_matrix[0] = 1.0;
00709 chgroup->decorrelation_matrix[1] = -1.0;
00710 chgroup->decorrelation_matrix[2] = 1.0;
00711 chgroup->decorrelation_matrix[3] = 1.0;
00712 } else {
00714 chgroup->decorrelation_matrix[0] = 0.70703125;
00715 chgroup->decorrelation_matrix[1] = -0.70703125;
00716 chgroup->decorrelation_matrix[2] = 0.70703125;
00717 chgroup->decorrelation_matrix[3] = 0.70703125;
00718 }
00719 }
00720 } else if (chgroup->num_channels > 2) {
00721 if (get_bits1(&s->gb)) {
00722 chgroup->transform = 1;
00723 if (get_bits1(&s->gb)) {
00724 decode_decorrelation_matrix(s, chgroup);
00725 } else {
00727 if (chgroup->num_channels > 6) {
00728 av_log_ask_for_sample(s->avctx,
00729 "coupled channels > 6\n");
00730 } else {
00731 memcpy(chgroup->decorrelation_matrix,
00732 default_decorrelation[chgroup->num_channels],
00733 chgroup->num_channels * chgroup->num_channels *
00734 sizeof(*chgroup->decorrelation_matrix));
00735 }
00736 }
00737 }
00738 }
00739
00741 if (chgroup->transform) {
00742 if (!get_bits1(&s->gb)) {
00743 int i;
00745 for (i = 0; i < s->num_bands; i++) {
00746 chgroup->transform_band[i] = get_bits1(&s->gb);
00747 }
00748 } else {
00749 memset(chgroup->transform_band, 1, s->num_bands);
00750 }
00751 }
00752 remaining_channels -= chgroup->num_channels;
00753 }
00754 }
00755 return 0;
00756 }
00757
00764 static int decode_coeffs(WMAProDecodeCtx *s, int c)
00765 {
00766
00767
00768
00769 static const int fval_tab[16] = {
00770 0x00000000, 0x3f800000, 0x40000000, 0x40400000,
00771 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
00772 0x41000000, 0x41100000, 0x41200000, 0x41300000,
00773 0x41400000, 0x41500000, 0x41600000, 0x41700000,
00774 };
00775 int vlctable;
00776 VLC* vlc;
00777 WMAProChannelCtx* ci = &s->channel[c];
00778 int rl_mode = 0;
00779 int cur_coeff = 0;
00780 int num_zeros = 0;
00781 const uint16_t* run;
00782 const float* level;
00783
00784 av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
00785
00786 vlctable = get_bits1(&s->gb);
00787 vlc = &coef_vlc[vlctable];
00788
00789 if (vlctable) {
00790 run = coef1_run;
00791 level = coef1_level;
00792 } else {
00793 run = coef0_run;
00794 level = coef0_level;
00795 }
00796
00799 while ((s->transmit_num_vec_coeffs || !rl_mode) &&
00800 (cur_coeff + 3 < ci->num_vec_coeffs)) {
00801 int vals[4];
00802 int i;
00803 unsigned int idx;
00804
00805 idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
00806
00807 if (idx == HUFF_VEC4_SIZE - 1) {
00808 for (i = 0; i < 4; i += 2) {
00809 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
00810 if (idx == HUFF_VEC2_SIZE - 1) {
00811 int v0, v1;
00812 v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00813 if (v0 == HUFF_VEC1_SIZE - 1)
00814 v0 += ff_wma_get_large_val(&s->gb);
00815 v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00816 if (v1 == HUFF_VEC1_SIZE - 1)
00817 v1 += ff_wma_get_large_val(&s->gb);
00818 ((float*)vals)[i ] = v0;
00819 ((float*)vals)[i+1] = v1;
00820 } else {
00821 vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
00822 vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
00823 }
00824 }
00825 } else {
00826 vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
00827 vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
00828 vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
00829 vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
00830 }
00831
00833 for (i = 0; i < 4; i++) {
00834 if (vals[i]) {
00835 int sign = get_bits1(&s->gb) - 1;
00836 *(uint32_t*)&ci->coeffs[cur_coeff] = vals[i] ^ sign<<31;
00837 num_zeros = 0;
00838 } else {
00839 ci->coeffs[cur_coeff] = 0;
00842 rl_mode |= (++num_zeros > s->subframe_len >> 8);
00843 }
00844 ++cur_coeff;
00845 }
00846 }
00847
00849 if (cur_coeff < s->subframe_len) {
00850 memset(&ci->coeffs[cur_coeff], 0,
00851 sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
00852 if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
00853 level, run, 1, ci->coeffs,
00854 cur_coeff, s->subframe_len,
00855 s->subframe_len, s->esc_len, 0))
00856 return AVERROR_INVALIDDATA;
00857 }
00858
00859 return 0;
00860 }
00861
00867 static int decode_scale_factors(WMAProDecodeCtx* s)
00868 {
00869 int i;
00870
00875 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00876 int c = s->channel_indexes_for_cur_subframe[i];
00877 int* sf;
00878 int* sf_end;
00879 s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
00880 sf_end = s->channel[c].scale_factors + s->num_bands;
00881
00887 if (s->channel[c].reuse_sf) {
00888 const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
00889 int b;
00890 for (b = 0; b < s->num_bands; b++)
00891 s->channel[c].scale_factors[b] =
00892 s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
00893 }
00894
00895 if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
00896
00897 if (!s->channel[c].reuse_sf) {
00898 int val;
00900 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
00901 val = 45 / s->channel[c].scale_factor_step;
00902 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
00903 val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
00904 *sf = val;
00905 }
00906 } else {
00907 int i;
00909 for (i = 0; i < s->num_bands; i++) {
00910 int idx;
00911 int skip;
00912 int val;
00913 int sign;
00914
00915 idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
00916
00917 if (!idx) {
00918 uint32_t code = get_bits(&s->gb, 14);
00919 val = code >> 6;
00920 sign = (code & 1) - 1;
00921 skip = (code & 0x3f) >> 1;
00922 } else if (idx == 1) {
00923 break;
00924 } else {
00925 skip = scale_rl_run[idx];
00926 val = scale_rl_level[idx];
00927 sign = get_bits1(&s->gb)-1;
00928 }
00929
00930 i += skip;
00931 if (i >= s->num_bands) {
00932 av_log(s->avctx, AV_LOG_ERROR,
00933 "invalid scale factor coding\n");
00934 return AVERROR_INVALIDDATA;
00935 }
00936 s->channel[c].scale_factors[i] += (val ^ sign) - sign;
00937 }
00938 }
00940 s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
00941 s->channel[c].table_idx = s->table_idx;
00942 s->channel[c].reuse_sf = 1;
00943 }
00944
00946 s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
00947 for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
00948 s->channel[c].max_scale_factor =
00949 FFMAX(s->channel[c].max_scale_factor, *sf);
00950 }
00951
00952 }
00953 return 0;
00954 }
00955
00960 static void inverse_channel_transform(WMAProDecodeCtx *s)
00961 {
00962 int i;
00963
00964 for (i = 0; i < s->num_chgroups; i++) {
00965 if (s->chgroup[i].transform) {
00966 float data[WMAPRO_MAX_CHANNELS];
00967 const int num_channels = s->chgroup[i].num_channels;
00968 float** ch_data = s->chgroup[i].channel_data;
00969 float** ch_end = ch_data + num_channels;
00970 const int8_t* tb = s->chgroup[i].transform_band;
00971 int16_t* sfb;
00972
00974 for (sfb = s->cur_sfb_offsets;
00975 sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
00976 int y;
00977 if (*tb++ == 1) {
00979 for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
00980 const float* mat = s->chgroup[i].decorrelation_matrix;
00981 const float* data_end = data + num_channels;
00982 float* data_ptr = data;
00983 float** ch;
00984
00985 for (ch = ch_data; ch < ch_end; ch++)
00986 *data_ptr++ = (*ch)[y];
00987
00988 for (ch = ch_data; ch < ch_end; ch++) {
00989 float sum = 0;
00990 data_ptr = data;
00991 while (data_ptr < data_end)
00992 sum += *data_ptr++ * *mat++;
00993
00994 (*ch)[y] = sum;
00995 }
00996 }
00997 } else if (s->num_channels == 2) {
00998 int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
00999 s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0],
01000 ch_data[0] + sfb[0],
01001 181.0 / 128, len);
01002 s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0],
01003 ch_data[1] + sfb[0],
01004 181.0 / 128, len);
01005 }
01006 }
01007 }
01008 }
01009 }
01010
01015 static void wmapro_window(WMAProDecodeCtx *s)
01016 {
01017 int i;
01018 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01019 int c = s->channel_indexes_for_cur_subframe[i];
01020 float* window;
01021 int winlen = s->channel[c].prev_block_len;
01022 float* start = s->channel[c].coeffs - (winlen >> 1);
01023
01024 if (s->subframe_len < winlen) {
01025 start += (winlen - s->subframe_len) >> 1;
01026 winlen = s->subframe_len;
01027 }
01028
01029 window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
01030
01031 winlen >>= 1;
01032
01033 s->dsp.vector_fmul_window(start, start, start + winlen,
01034 window, winlen);
01035
01036 s->channel[c].prev_block_len = s->subframe_len;
01037 }
01038 }
01039
01045 static int decode_subframe(WMAProDecodeCtx *s)
01046 {
01047 int offset = s->samples_per_frame;
01048 int subframe_len = s->samples_per_frame;
01049 int i;
01050 int total_samples = s->samples_per_frame * s->num_channels;
01051 int transmit_coeffs = 0;
01052 int cur_subwoofer_cutoff;
01053
01054 s->subframe_offset = get_bits_count(&s->gb);
01055
01060 for (i = 0; i < s->num_channels; i++) {
01061 s->channel[i].grouped = 0;
01062 if (offset > s->channel[i].decoded_samples) {
01063 offset = s->channel[i].decoded_samples;
01064 subframe_len =
01065 s->channel[i].subframe_len[s->channel[i].cur_subframe];
01066 }
01067 }
01068
01069 av_dlog(s->avctx,
01070 "processing subframe with offset %i len %i\n", offset, subframe_len);
01071
01073 s->channels_for_cur_subframe = 0;
01074 for (i = 0; i < s->num_channels; i++) {
01075 const int cur_subframe = s->channel[i].cur_subframe;
01077 total_samples -= s->channel[i].decoded_samples;
01078
01080 if (offset == s->channel[i].decoded_samples &&
01081 subframe_len == s->channel[i].subframe_len[cur_subframe]) {
01082 total_samples -= s->channel[i].subframe_len[cur_subframe];
01083 s->channel[i].decoded_samples +=
01084 s->channel[i].subframe_len[cur_subframe];
01085 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
01086 ++s->channels_for_cur_subframe;
01087 }
01088 }
01089
01092 if (!total_samples)
01093 s->parsed_all_subframes = 1;
01094
01095
01096 av_dlog(s->avctx, "subframe is part of %i channels\n",
01097 s->channels_for_cur_subframe);
01098
01100 s->table_idx = av_log2(s->samples_per_frame/subframe_len);
01101 s->num_bands = s->num_sfb[s->table_idx];
01102 s->cur_sfb_offsets = s->sfb_offsets[s->table_idx];
01103 cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
01104
01106 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01107 int c = s->channel_indexes_for_cur_subframe[i];
01108
01109 s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1)
01110 + offset];
01111 }
01112
01113 s->subframe_len = subframe_len;
01114 s->esc_len = av_log2(s->subframe_len - 1) + 1;
01115
01117 if (get_bits1(&s->gb)) {
01118 int num_fill_bits;
01119 if (!(num_fill_bits = get_bits(&s->gb, 2))) {
01120 int len = get_bits(&s->gb, 4);
01121 num_fill_bits = get_bits(&s->gb, len) + 1;
01122 }
01123
01124 if (num_fill_bits >= 0) {
01125 if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
01126 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
01127 return AVERROR_INVALIDDATA;
01128 }
01129
01130 skip_bits_long(&s->gb, num_fill_bits);
01131 }
01132 }
01133
01135 if (get_bits1(&s->gb)) {
01136 av_log_ask_for_sample(s->avctx, "reserved bit set\n");
01137 return AVERROR_INVALIDDATA;
01138 }
01139
01140
01141 if (decode_channel_transform(s) < 0)
01142 return AVERROR_INVALIDDATA;
01143
01144
01145 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01146 int c = s->channel_indexes_for_cur_subframe[i];
01147 if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
01148 transmit_coeffs = 1;
01149 }
01150
01151 if (transmit_coeffs) {
01152 int step;
01153 int quant_step = 90 * s->bits_per_sample >> 4;
01154
01156 if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
01157 int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
01158 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01159 int c = s->channel_indexes_for_cur_subframe[i];
01160 s->channel[c].num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
01161 }
01162 } else {
01163 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01164 int c = s->channel_indexes_for_cur_subframe[i];
01165 s->channel[c].num_vec_coeffs = s->subframe_len;
01166 }
01167 }
01169 step = get_sbits(&s->gb, 6);
01170 quant_step += step;
01171 if (step == -32 || step == 31) {
01172 const int sign = (step == 31) - 1;
01173 int quant = 0;
01174 while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
01175 (step = get_bits(&s->gb, 5)) == 31) {
01176 quant += 31;
01177 }
01178 quant_step += ((quant + step) ^ sign) - sign;
01179 }
01180 if (quant_step < 0) {
01181 av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
01182 }
01183
01186 if (s->channels_for_cur_subframe == 1) {
01187 s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
01188 } else {
01189 int modifier_len = get_bits(&s->gb, 3);
01190 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01191 int c = s->channel_indexes_for_cur_subframe[i];
01192 s->channel[c].quant_step = quant_step;
01193 if (get_bits1(&s->gb)) {
01194 if (modifier_len) {
01195 s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
01196 } else
01197 ++s->channel[c].quant_step;
01198 }
01199 }
01200 }
01201
01203 if (decode_scale_factors(s) < 0)
01204 return AVERROR_INVALIDDATA;
01205 }
01206
01207 av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
01208 get_bits_count(&s->gb) - s->subframe_offset);
01209
01211 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01212 int c = s->channel_indexes_for_cur_subframe[i];
01213 if (s->channel[c].transmit_coefs &&
01214 get_bits_count(&s->gb) < s->num_saved_bits) {
01215 decode_coeffs(s, c);
01216 } else
01217 memset(s->channel[c].coeffs, 0,
01218 sizeof(*s->channel[c].coeffs) * subframe_len);
01219 }
01220
01221 av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
01222 get_bits_count(&s->gb) - s->subframe_offset);
01223
01224 if (transmit_coeffs) {
01226 inverse_channel_transform(s);
01227 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01228 int c = s->channel_indexes_for_cur_subframe[i];
01229 const int* sf = s->channel[c].scale_factors;
01230 int b;
01231
01232 if (c == s->lfe_channel)
01233 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
01234 (subframe_len - cur_subwoofer_cutoff));
01235
01237 for (b = 0; b < s->num_bands; b++) {
01238 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
01239 const int exp = s->channel[c].quant_step -
01240 (s->channel[c].max_scale_factor - *sf++) *
01241 s->channel[c].scale_factor_step;
01242 const float quant = pow(10.0, exp / 20.0);
01243 int start = s->cur_sfb_offsets[b];
01244 s->dsp.vector_fmul_scalar(s->tmp + start,
01245 s->channel[c].coeffs + start,
01246 quant, end - start);
01247 }
01248
01250 ff_imdct_half(&s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS],
01251 s->channel[c].coeffs, s->tmp);
01252 }
01253 }
01254
01256 wmapro_window(s);
01257
01259 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01260 int c = s->channel_indexes_for_cur_subframe[i];
01261 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
01262 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
01263 return AVERROR_INVALIDDATA;
01264 }
01265 ++s->channel[c].cur_subframe;
01266 }
01267
01268 return 0;
01269 }
01270
01277 static int decode_frame(WMAProDecodeCtx *s)
01278 {
01279 GetBitContext* gb = &s->gb;
01280 int more_frames = 0;
01281 int len = 0;
01282 int i;
01283
01285 if (s->num_channels * s->samples_per_frame > s->samples_end - s->samples) {
01287 av_log(s->avctx, AV_LOG_ERROR,
01288 "not enough space for the output samples\n");
01289 s->packet_loss = 1;
01290 return 0;
01291 }
01292
01294 if (s->len_prefix)
01295 len = get_bits(gb, s->log2_frame_size);
01296
01297 av_dlog(s->avctx, "decoding frame with length %x\n", len);
01298
01300 if (decode_tilehdr(s)) {
01301 s->packet_loss = 1;
01302 return 0;
01303 }
01304
01306 if (s->num_channels > 1 && get_bits1(gb)) {
01307 if (get_bits1(gb)) {
01308 for (i = 0; i < s->num_channels * s->num_channels; i++)
01309 skip_bits(gb, 4);
01310 }
01311 }
01312
01314 if (s->dynamic_range_compression) {
01315 s->drc_gain = get_bits(gb, 8);
01316 av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
01317 }
01318
01321 if (get_bits1(gb)) {
01322 int skip;
01323
01325 if (get_bits1(gb)) {
01326 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01327 av_dlog(s->avctx, "start skip: %i\n", skip);
01328 }
01329
01331 if (get_bits1(gb)) {
01332 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01333 av_dlog(s->avctx, "end skip: %i\n", skip);
01334 }
01335
01336 }
01337
01338 av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
01339 get_bits_count(gb) - s->frame_offset);
01340
01342 s->parsed_all_subframes = 0;
01343 for (i = 0; i < s->num_channels; i++) {
01344 s->channel[i].decoded_samples = 0;
01345 s->channel[i].cur_subframe = 0;
01346 s->channel[i].reuse_sf = 0;
01347 }
01348
01350 while (!s->parsed_all_subframes) {
01351 if (decode_subframe(s) < 0) {
01352 s->packet_loss = 1;
01353 return 0;
01354 }
01355 }
01356
01358 for (i = 0; i < s->num_channels; i++) {
01359 float* ptr = s->samples + i;
01360 int incr = s->num_channels;
01361 float* iptr = s->channel[i].out;
01362 float* iend = iptr + s->samples_per_frame;
01363
01364
01365 while (iptr < iend) {
01366 *ptr = *iptr++;
01367 ptr += incr;
01368 }
01369
01371 memcpy(&s->channel[i].out[0],
01372 &s->channel[i].out[s->samples_per_frame],
01373 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
01374 }
01375
01376 if (s->skip_frame) {
01377 s->skip_frame = 0;
01378 } else
01379 s->samples += s->num_channels * s->samples_per_frame;
01380
01381 if (s->len_prefix) {
01382 if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
01384 av_log(s->avctx, AV_LOG_ERROR,
01385 "frame[%i] would have to skip %i bits\n", s->frame_num,
01386 len - (get_bits_count(gb) - s->frame_offset) - 1);
01387 s->packet_loss = 1;
01388 return 0;
01389 }
01390
01392 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
01393 } else {
01394 while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
01395 }
01396 }
01397
01399 more_frames = get_bits1(gb);
01400
01401 ++s->frame_num;
01402 return more_frames;
01403 }
01404
01411 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
01412 {
01413 return s->buf_bit_size - get_bits_count(gb);
01414 }
01415
01423 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
01424 int append)
01425 {
01426 int buflen;
01427
01432 if (!append) {
01433 s->frame_offset = get_bits_count(gb) & 7;
01434 s->num_saved_bits = s->frame_offset;
01435 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
01436 }
01437
01438 buflen = (s->num_saved_bits + len + 8) >> 3;
01439
01440 if (len <= 0 || buflen > MAX_FRAMESIZE) {
01441 av_log_ask_for_sample(s->avctx, "input buffer too small\n");
01442 s->packet_loss = 1;
01443 return;
01444 }
01445
01446 s->num_saved_bits += len;
01447 if (!append) {
01448 ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
01449 s->num_saved_bits);
01450 } else {
01451 int align = 8 - (get_bits_count(gb) & 7);
01452 align = FFMIN(align, len);
01453 put_bits(&s->pb, align, get_bits(gb, align));
01454 len -= align;
01455 ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
01456 }
01457 skip_bits_long(gb, len);
01458
01459 {
01460 PutBitContext tmp = s->pb;
01461 flush_put_bits(&tmp);
01462 }
01463
01464 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
01465 skip_bits(&s->gb, s->frame_offset);
01466 }
01467
01476 static int decode_packet(AVCodecContext *avctx,
01477 void *data, int *data_size, AVPacket* avpkt)
01478 {
01479 WMAProDecodeCtx *s = avctx->priv_data;
01480 GetBitContext* gb = &s->pgb;
01481 const uint8_t* buf = avpkt->data;
01482 int buf_size = avpkt->size;
01483 int num_bits_prev_frame;
01484 int packet_sequence_number;
01485
01486 s->samples = data;
01487 s->samples_end = (float*)((int8_t*)data + *data_size);
01488 *data_size = 0;
01489
01490 if (s->packet_done || s->packet_loss) {
01491 s->packet_done = 0;
01492
01494 if (buf_size < avctx->block_align)
01495 return 0;
01496
01497 s->next_packet_start = buf_size - avctx->block_align;
01498 buf_size = avctx->block_align;
01499 s->buf_bit_size = buf_size << 3;
01500
01502 init_get_bits(gb, buf, s->buf_bit_size);
01503 packet_sequence_number = get_bits(gb, 4);
01504 skip_bits(gb, 2);
01505
01507 num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
01508 av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
01509 num_bits_prev_frame);
01510
01512 if (!s->packet_loss &&
01513 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
01514 s->packet_loss = 1;
01515 av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
01516 s->packet_sequence_number, packet_sequence_number);
01517 }
01518 s->packet_sequence_number = packet_sequence_number;
01519
01520 if (num_bits_prev_frame > 0) {
01521 int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
01522 if (num_bits_prev_frame >= remaining_packet_bits) {
01523 num_bits_prev_frame = remaining_packet_bits;
01524 s->packet_done = 1;
01525 }
01526
01529 save_bits(s, gb, num_bits_prev_frame, 1);
01530 av_dlog(avctx, "accumulated %x bits of frame data\n",
01531 s->num_saved_bits - s->frame_offset);
01532
01534 if (!s->packet_loss)
01535 decode_frame(s);
01536 } else if (s->num_saved_bits - s->frame_offset) {
01537 av_dlog(avctx, "ignoring %x previously saved bits\n",
01538 s->num_saved_bits - s->frame_offset);
01539 }
01540
01541 if (s->packet_loss) {
01545 s->num_saved_bits = 0;
01546 s->packet_loss = 0;
01547 }
01548
01549 } else {
01550 int frame_size;
01551 s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
01552 init_get_bits(gb, avpkt->data, s->buf_bit_size);
01553 skip_bits(gb, s->packet_offset);
01554 if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
01555 (frame_size = show_bits(gb, s->log2_frame_size)) &&
01556 frame_size <= remaining_bits(s, gb)) {
01557 save_bits(s, gb, frame_size, 0);
01558 s->packet_done = !decode_frame(s);
01559 } else if (!s->len_prefix
01560 && s->num_saved_bits > get_bits_count(&s->gb)) {
01568 s->packet_done = !decode_frame(s);
01569 } else
01570 s->packet_done = 1;
01571 }
01572
01573 if (s->packet_done && !s->packet_loss &&
01574 remaining_bits(s, gb) > 0) {
01577 save_bits(s, gb, remaining_bits(s, gb), 0);
01578 }
01579
01580 *data_size = (int8_t *)s->samples - (int8_t *)data;
01581 s->packet_offset = get_bits_count(gb) & 7;
01582
01583 return (s->packet_loss) ? AVERROR_INVALIDDATA : get_bits_count(gb) >> 3;
01584 }
01585
01590 static void flush(AVCodecContext *avctx)
01591 {
01592 WMAProDecodeCtx *s = avctx->priv_data;
01593 int i;
01596 for (i = 0; i < s->num_channels; i++)
01597 memset(s->channel[i].out, 0, s->samples_per_frame *
01598 sizeof(*s->channel[i].out));
01599 s->packet_loss = 1;
01600 }
01601
01602
01606 AVCodec ff_wmapro_decoder = {
01607 "wmapro",
01608 AVMEDIA_TYPE_AUDIO,
01609 CODEC_ID_WMAPRO,
01610 sizeof(WMAProDecodeCtx),
01611 decode_init,
01612 NULL,
01613 decode_end,
01614 decode_packet,
01615 .capabilities = CODEC_CAP_SUBFRAMES,
01616 .flush= flush,
01617 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
01618 };