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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 "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
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
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
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
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
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;
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 if (s->avctx->sample_rate <= 0) {
00330 av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
00331 return AVERROR_INVALIDDATA;
00332 }
00333
00334 s->num_channels = avctx->channels;
00335
00336 if (s->num_channels < 0) {
00337 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
00338 return AVERROR_INVALIDDATA;
00339 } else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
00340 av_log_ask_for_sample(avctx, "unsupported number of channels\n");
00341 return AVERROR_PATCHWELCOME;
00342 }
00343
00345 for (i = 0; i < s->num_channels; i++)
00346 s->channel[i].prev_block_len = s->samples_per_frame;
00347
00349 s->lfe_channel = -1;
00350
00351 if (channel_mask & 8) {
00352 unsigned int mask;
00353 for (mask = 1; mask < 16; mask <<= 1) {
00354 if (channel_mask & mask)
00355 ++s->lfe_channel;
00356 }
00357 }
00358
00359 INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
00360 scale_huffbits, 1, 1,
00361 scale_huffcodes, 2, 2, 616);
00362
00363 INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
00364 scale_rl_huffbits, 1, 1,
00365 scale_rl_huffcodes, 4, 4, 1406);
00366
00367 INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
00368 coef0_huffbits, 1, 1,
00369 coef0_huffcodes, 4, 4, 2108);
00370
00371 INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
00372 coef1_huffbits, 1, 1,
00373 coef1_huffcodes, 4, 4, 3912);
00374
00375 INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
00376 vec4_huffbits, 1, 1,
00377 vec4_huffcodes, 2, 2, 604);
00378
00379 INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
00380 vec2_huffbits, 1, 1,
00381 vec2_huffcodes, 2, 2, 562);
00382
00383 INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
00384 vec1_huffbits, 1, 1,
00385 vec1_huffcodes, 2, 2, 562);
00386
00389 for (i = 0; i < num_possible_block_sizes; i++) {
00390 int subframe_len = s->samples_per_frame >> i;
00391 int x;
00392 int band = 1;
00393
00394 s->sfb_offsets[i][0] = 0;
00395
00396 for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
00397 int offset = (subframe_len * 2 * critical_freq[x])
00398 / s->avctx->sample_rate + 2;
00399 offset &= ~3;
00400 if (offset > s->sfb_offsets[i][band - 1])
00401 s->sfb_offsets[i][band++] = offset;
00402 }
00403 s->sfb_offsets[i][band - 1] = subframe_len;
00404 s->num_sfb[i] = band - 1;
00405 }
00406
00407
00413 for (i = 0; i < num_possible_block_sizes; i++) {
00414 int b;
00415 for (b = 0; b < s->num_sfb[i]; b++) {
00416 int x;
00417 int offset = ((s->sfb_offsets[i][b]
00418 + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
00419 for (x = 0; x < num_possible_block_sizes; x++) {
00420 int v = 0;
00421 while (s->sfb_offsets[x][v + 1] << x < offset)
00422 ++v;
00423 s->sf_offsets[i][x][b] = v;
00424 }
00425 }
00426 }
00427
00429 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00430 ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
00431 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
00432 / (1 << (s->bits_per_sample - 1)));
00433
00435 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
00436 const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
00437 ff_init_ff_sine_windows(win_idx);
00438 s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
00439 }
00440
00442 for (i = 0; i < num_possible_block_sizes; i++) {
00443 int block_size = s->samples_per_frame >> i;
00444 int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
00445 / s->avctx->sample_rate;
00446 s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
00447 }
00448
00450 for (i = 0; i < 33; i++)
00451 sin64[i] = sin(i*M_PI / 64.0);
00452
00453 if (avctx->debug & FF_DEBUG_BITSTREAM)
00454 dump_context(s);
00455
00456 avctx->channel_layout = channel_mask;
00457 return 0;
00458 }
00459
00466 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
00467 {
00468 int frame_len_shift = 0;
00469 int subframe_len;
00470
00472 if (offset == s->samples_per_frame - s->min_samples_per_subframe)
00473 return s->min_samples_per_subframe;
00474
00476 if (s->max_subframe_len_bit) {
00477 if (get_bits1(&s->gb))
00478 frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
00479 } else
00480 frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
00481
00482 subframe_len = s->samples_per_frame >> frame_len_shift;
00483
00485 if (subframe_len < s->min_samples_per_subframe ||
00486 subframe_len > s->samples_per_frame) {
00487 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
00488 subframe_len);
00489 return AVERROR_INVALIDDATA;
00490 }
00491 return subframe_len;
00492 }
00493
00514 static int decode_tilehdr(WMAProDecodeCtx *s)
00515 {
00516 uint16_t num_samples[WMAPRO_MAX_CHANNELS];
00517 uint8_t contains_subframe[WMAPRO_MAX_CHANNELS];
00518 int channels_for_cur_subframe = s->num_channels;
00519 int fixed_channel_layout = 0;
00520 int min_channel_len = 0;
00521 int c;
00522
00523
00524
00525
00526
00527
00528
00530 for (c = 0; c < s->num_channels; c++)
00531 s->channel[c].num_subframes = 0;
00532
00533 memset(num_samples, 0, sizeof(num_samples));
00534
00535 if (s->max_num_subframes == 1 || get_bits1(&s->gb))
00536 fixed_channel_layout = 1;
00537
00539 do {
00540 int subframe_len;
00541
00543 for (c = 0; c < s->num_channels; c++) {
00544 if (num_samples[c] == min_channel_len) {
00545 if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
00546 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
00547 contains_subframe[c] = 1;
00548 else
00549 contains_subframe[c] = get_bits1(&s->gb);
00550 } else
00551 contains_subframe[c] = 0;
00552 }
00553
00555 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
00556 return AVERROR_INVALIDDATA;
00557
00559 min_channel_len += subframe_len;
00560 for (c = 0; c < s->num_channels; c++) {
00561 WMAProChannelCtx* chan = &s->channel[c];
00562
00563 if (contains_subframe[c]) {
00564 if (chan->num_subframes >= MAX_SUBFRAMES) {
00565 av_log(s->avctx, AV_LOG_ERROR,
00566 "broken frame: num subframes > 31\n");
00567 return AVERROR_INVALIDDATA;
00568 }
00569 chan->subframe_len[chan->num_subframes] = subframe_len;
00570 num_samples[c] += subframe_len;
00571 ++chan->num_subframes;
00572 if (num_samples[c] > s->samples_per_frame) {
00573 av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
00574 "channel len > samples_per_frame\n");
00575 return AVERROR_INVALIDDATA;
00576 }
00577 } else if (num_samples[c] <= min_channel_len) {
00578 if (num_samples[c] < min_channel_len) {
00579 channels_for_cur_subframe = 0;
00580 min_channel_len = num_samples[c];
00581 }
00582 ++channels_for_cur_subframe;
00583 }
00584 }
00585 } while (min_channel_len < s->samples_per_frame);
00586
00587 for (c = 0; c < s->num_channels; c++) {
00588 int i;
00589 int offset = 0;
00590 for (i = 0; i < s->channel[c].num_subframes; i++) {
00591 av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
00592 " len %i\n", s->frame_num, c, i,
00593 s->channel[c].subframe_len[i]);
00594 s->channel[c].subframe_offset[i] = offset;
00595 offset += s->channel[c].subframe_len[i];
00596 }
00597 }
00598
00599 return 0;
00600 }
00601
00607 static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
00608 WMAProChannelGrp *chgroup)
00609 {
00610 int i;
00611 int offset = 0;
00612 int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
00613 memset(chgroup->decorrelation_matrix, 0, s->num_channels *
00614 s->num_channels * sizeof(*chgroup->decorrelation_matrix));
00615
00616 for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
00617 rotation_offset[i] = get_bits(&s->gb, 6);
00618
00619 for (i = 0; i < chgroup->num_channels; i++)
00620 chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
00621 get_bits1(&s->gb) ? 1.0 : -1.0;
00622
00623 for (i = 1; i < chgroup->num_channels; i++) {
00624 int x;
00625 for (x = 0; x < i; x++) {
00626 int y;
00627 for (y = 0; y < i + 1; y++) {
00628 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
00629 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
00630 int n = rotation_offset[offset + x];
00631 float sinv;
00632 float cosv;
00633
00634 if (n < 32) {
00635 sinv = sin64[n];
00636 cosv = sin64[32 - n];
00637 } else {
00638 sinv = sin64[64 - n];
00639 cosv = -sin64[n - 32];
00640 }
00641
00642 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
00643 (v1 * sinv) - (v2 * cosv);
00644 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
00645 (v1 * cosv) + (v2 * sinv);
00646 }
00647 }
00648 offset += i;
00649 }
00650 }
00651
00657 static int decode_channel_transform(WMAProDecodeCtx* s)
00658 {
00659 int i;
00660
00661
00662
00663
00664
00666 s->num_chgroups = 0;
00667 if (s->num_channels > 1) {
00668 int remaining_channels = s->channels_for_cur_subframe;
00669
00670 if (get_bits1(&s->gb)) {
00671 av_log_ask_for_sample(s->avctx,
00672 "unsupported channel transform bit\n");
00673 return AVERROR_INVALIDDATA;
00674 }
00675
00676 for (s->num_chgroups = 0; remaining_channels &&
00677 s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
00678 WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
00679 float** channel_data = chgroup->channel_data;
00680 chgroup->num_channels = 0;
00681 chgroup->transform = 0;
00682
00684 if (remaining_channels > 2) {
00685 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00686 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00687 if (!s->channel[channel_idx].grouped
00688 && get_bits1(&s->gb)) {
00689 ++chgroup->num_channels;
00690 s->channel[channel_idx].grouped = 1;
00691 *channel_data++ = s->channel[channel_idx].coeffs;
00692 }
00693 }
00694 } else {
00695 chgroup->num_channels = remaining_channels;
00696 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00697 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00698 if (!s->channel[channel_idx].grouped)
00699 *channel_data++ = s->channel[channel_idx].coeffs;
00700 s->channel[channel_idx].grouped = 1;
00701 }
00702 }
00703
00705 if (chgroup->num_channels == 2) {
00706 if (get_bits1(&s->gb)) {
00707 if (get_bits1(&s->gb)) {
00708 av_log_ask_for_sample(s->avctx,
00709 "unsupported channel transform type\n");
00710 }
00711 } else {
00712 chgroup->transform = 1;
00713 if (s->num_channels == 2) {
00714 chgroup->decorrelation_matrix[0] = 1.0;
00715 chgroup->decorrelation_matrix[1] = -1.0;
00716 chgroup->decorrelation_matrix[2] = 1.0;
00717 chgroup->decorrelation_matrix[3] = 1.0;
00718 } else {
00720 chgroup->decorrelation_matrix[0] = 0.70703125;
00721 chgroup->decorrelation_matrix[1] = -0.70703125;
00722 chgroup->decorrelation_matrix[2] = 0.70703125;
00723 chgroup->decorrelation_matrix[3] = 0.70703125;
00724 }
00725 }
00726 } else if (chgroup->num_channels > 2) {
00727 if (get_bits1(&s->gb)) {
00728 chgroup->transform = 1;
00729 if (get_bits1(&s->gb)) {
00730 decode_decorrelation_matrix(s, chgroup);
00731 } else {
00733 if (chgroup->num_channels > 6) {
00734 av_log_ask_for_sample(s->avctx,
00735 "coupled channels > 6\n");
00736 } else {
00737 memcpy(chgroup->decorrelation_matrix,
00738 default_decorrelation[chgroup->num_channels],
00739 chgroup->num_channels * chgroup->num_channels *
00740 sizeof(*chgroup->decorrelation_matrix));
00741 }
00742 }
00743 }
00744 }
00745
00747 if (chgroup->transform) {
00748 if (!get_bits1(&s->gb)) {
00749 int i;
00751 for (i = 0; i < s->num_bands; i++) {
00752 chgroup->transform_band[i] = get_bits1(&s->gb);
00753 }
00754 } else {
00755 memset(chgroup->transform_band, 1, s->num_bands);
00756 }
00757 }
00758 remaining_channels -= chgroup->num_channels;
00759 }
00760 }
00761 return 0;
00762 }
00763
00770 static int decode_coeffs(WMAProDecodeCtx *s, int c)
00771 {
00772
00773
00774
00775 static const int fval_tab[16] = {
00776 0x00000000, 0x3f800000, 0x40000000, 0x40400000,
00777 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
00778 0x41000000, 0x41100000, 0x41200000, 0x41300000,
00779 0x41400000, 0x41500000, 0x41600000, 0x41700000,
00780 };
00781 int vlctable;
00782 VLC* vlc;
00783 WMAProChannelCtx* ci = &s->channel[c];
00784 int rl_mode = 0;
00785 int cur_coeff = 0;
00786 int num_zeros = 0;
00787 const uint16_t* run;
00788 const float* level;
00789
00790 av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
00791
00792 vlctable = get_bits1(&s->gb);
00793 vlc = &coef_vlc[vlctable];
00794
00795 if (vlctable) {
00796 run = coef1_run;
00797 level = coef1_level;
00798 } else {
00799 run = coef0_run;
00800 level = coef0_level;
00801 }
00802
00805 while ((s->transmit_num_vec_coeffs || !rl_mode) &&
00806 (cur_coeff + 3 < ci->num_vec_coeffs)) {
00807 int vals[4];
00808 int i;
00809 unsigned int idx;
00810
00811 idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
00812
00813 if (idx == HUFF_VEC4_SIZE - 1) {
00814 for (i = 0; i < 4; i += 2) {
00815 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
00816 if (idx == HUFF_VEC2_SIZE - 1) {
00817 int v0, v1;
00818 v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00819 if (v0 == HUFF_VEC1_SIZE - 1)
00820 v0 += ff_wma_get_large_val(&s->gb);
00821 v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00822 if (v1 == HUFF_VEC1_SIZE - 1)
00823 v1 += ff_wma_get_large_val(&s->gb);
00824 ((float*)vals)[i ] = v0;
00825 ((float*)vals)[i+1] = v1;
00826 } else {
00827 vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
00828 vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
00829 }
00830 }
00831 } else {
00832 vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
00833 vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
00834 vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
00835 vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
00836 }
00837
00839 for (i = 0; i < 4; i++) {
00840 if (vals[i]) {
00841 int sign = get_bits1(&s->gb) - 1;
00842 *(uint32_t*)&ci->coeffs[cur_coeff] = vals[i] ^ sign<<31;
00843 num_zeros = 0;
00844 } else {
00845 ci->coeffs[cur_coeff] = 0;
00848 rl_mode |= (++num_zeros > s->subframe_len >> 8);
00849 }
00850 ++cur_coeff;
00851 }
00852 }
00853
00855 if (cur_coeff < s->subframe_len) {
00856 memset(&ci->coeffs[cur_coeff], 0,
00857 sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
00858 if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
00859 level, run, 1, ci->coeffs,
00860 cur_coeff, s->subframe_len,
00861 s->subframe_len, s->esc_len, 0))
00862 return AVERROR_INVALIDDATA;
00863 }
00864
00865 return 0;
00866 }
00867
00873 static int decode_scale_factors(WMAProDecodeCtx* s)
00874 {
00875 int i;
00876
00881 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00882 int c = s->channel_indexes_for_cur_subframe[i];
00883 int* sf;
00884 int* sf_end;
00885 s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
00886 sf_end = s->channel[c].scale_factors + s->num_bands;
00887
00893 if (s->channel[c].reuse_sf) {
00894 const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
00895 int b;
00896 for (b = 0; b < s->num_bands; b++)
00897 s->channel[c].scale_factors[b] =
00898 s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
00899 }
00900
00901 if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
00902
00903 if (!s->channel[c].reuse_sf) {
00904 int val;
00906 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
00907 val = 45 / s->channel[c].scale_factor_step;
00908 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
00909 val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
00910 *sf = val;
00911 }
00912 } else {
00913 int i;
00915 for (i = 0; i < s->num_bands; i++) {
00916 int idx;
00917 int skip;
00918 int val;
00919 int sign;
00920
00921 idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
00922
00923 if (!idx) {
00924 uint32_t code = get_bits(&s->gb, 14);
00925 val = code >> 6;
00926 sign = (code & 1) - 1;
00927 skip = (code & 0x3f) >> 1;
00928 } else if (idx == 1) {
00929 break;
00930 } else {
00931 skip = scale_rl_run[idx];
00932 val = scale_rl_level[idx];
00933 sign = get_bits1(&s->gb)-1;
00934 }
00935
00936 i += skip;
00937 if (i >= s->num_bands) {
00938 av_log(s->avctx, AV_LOG_ERROR,
00939 "invalid scale factor coding\n");
00940 return AVERROR_INVALIDDATA;
00941 }
00942 s->channel[c].scale_factors[i] += (val ^ sign) - sign;
00943 }
00944 }
00946 s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
00947 s->channel[c].table_idx = s->table_idx;
00948 s->channel[c].reuse_sf = 1;
00949 }
00950
00952 s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
00953 for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
00954 s->channel[c].max_scale_factor =
00955 FFMAX(s->channel[c].max_scale_factor, *sf);
00956 }
00957
00958 }
00959 return 0;
00960 }
00961
00966 static void inverse_channel_transform(WMAProDecodeCtx *s)
00967 {
00968 int i;
00969
00970 for (i = 0; i < s->num_chgroups; i++) {
00971 if (s->chgroup[i].transform) {
00972 float data[WMAPRO_MAX_CHANNELS];
00973 const int num_channels = s->chgroup[i].num_channels;
00974 float** ch_data = s->chgroup[i].channel_data;
00975 float** ch_end = ch_data + num_channels;
00976 const int8_t* tb = s->chgroup[i].transform_band;
00977 int16_t* sfb;
00978
00980 for (sfb = s->cur_sfb_offsets;
00981 sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
00982 int y;
00983 if (*tb++ == 1) {
00985 for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
00986 const float* mat = s->chgroup[i].decorrelation_matrix;
00987 const float* data_end = data + num_channels;
00988 float* data_ptr = data;
00989 float** ch;
00990
00991 for (ch = ch_data; ch < ch_end; ch++)
00992 *data_ptr++ = (*ch)[y];
00993
00994 for (ch = ch_data; ch < ch_end; ch++) {
00995 float sum = 0;
00996 data_ptr = data;
00997 while (data_ptr < data_end)
00998 sum += *data_ptr++ * *mat++;
00999
01000 (*ch)[y] = sum;
01001 }
01002 }
01003 } else if (s->num_channels == 2) {
01004 int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
01005 s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0],
01006 ch_data[0] + sfb[0],
01007 181.0 / 128, len);
01008 s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0],
01009 ch_data[1] + sfb[0],
01010 181.0 / 128, len);
01011 }
01012 }
01013 }
01014 }
01015 }
01016
01021 static void wmapro_window(WMAProDecodeCtx *s)
01022 {
01023 int i;
01024 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01025 int c = s->channel_indexes_for_cur_subframe[i];
01026 float* window;
01027 int winlen = s->channel[c].prev_block_len;
01028 float* start = s->channel[c].coeffs - (winlen >> 1);
01029
01030 if (s->subframe_len < winlen) {
01031 start += (winlen - s->subframe_len) >> 1;
01032 winlen = s->subframe_len;
01033 }
01034
01035 window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
01036
01037 winlen >>= 1;
01038
01039 s->dsp.vector_fmul_window(start, start, start + winlen,
01040 window, winlen);
01041
01042 s->channel[c].prev_block_len = s->subframe_len;
01043 }
01044 }
01045
01051 static int decode_subframe(WMAProDecodeCtx *s)
01052 {
01053 int offset = s->samples_per_frame;
01054 int subframe_len = s->samples_per_frame;
01055 int i;
01056 int total_samples = s->samples_per_frame * s->num_channels;
01057 int transmit_coeffs = 0;
01058 int cur_subwoofer_cutoff;
01059
01060 s->subframe_offset = get_bits_count(&s->gb);
01061
01066 for (i = 0; i < s->num_channels; i++) {
01067 s->channel[i].grouped = 0;
01068 if (offset > s->channel[i].decoded_samples) {
01069 offset = s->channel[i].decoded_samples;
01070 subframe_len =
01071 s->channel[i].subframe_len[s->channel[i].cur_subframe];
01072 }
01073 }
01074
01075 av_dlog(s->avctx,
01076 "processing subframe with offset %i len %i\n", offset, subframe_len);
01077
01079 s->channels_for_cur_subframe = 0;
01080 for (i = 0; i < s->num_channels; i++) {
01081 const int cur_subframe = s->channel[i].cur_subframe;
01083 total_samples -= s->channel[i].decoded_samples;
01084
01086 if (offset == s->channel[i].decoded_samples &&
01087 subframe_len == s->channel[i].subframe_len[cur_subframe]) {
01088 total_samples -= s->channel[i].subframe_len[cur_subframe];
01089 s->channel[i].decoded_samples +=
01090 s->channel[i].subframe_len[cur_subframe];
01091 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
01092 ++s->channels_for_cur_subframe;
01093 }
01094 }
01095
01098 if (!total_samples)
01099 s->parsed_all_subframes = 1;
01100
01101
01102 av_dlog(s->avctx, "subframe is part of %i channels\n",
01103 s->channels_for_cur_subframe);
01104
01106 s->table_idx = av_log2(s->samples_per_frame/subframe_len);
01107 s->num_bands = s->num_sfb[s->table_idx];
01108 s->cur_sfb_offsets = s->sfb_offsets[s->table_idx];
01109 cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
01110
01112 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01113 int c = s->channel_indexes_for_cur_subframe[i];
01114
01115 s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1)
01116 + offset];
01117 }
01118
01119 s->subframe_len = subframe_len;
01120 s->esc_len = av_log2(s->subframe_len - 1) + 1;
01121
01123 if (get_bits1(&s->gb)) {
01124 int num_fill_bits;
01125 if (!(num_fill_bits = get_bits(&s->gb, 2))) {
01126 int len = get_bits(&s->gb, 4);
01127 num_fill_bits = get_bits(&s->gb, len) + 1;
01128 }
01129
01130 if (num_fill_bits >= 0) {
01131 if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
01132 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
01133 return AVERROR_INVALIDDATA;
01134 }
01135
01136 skip_bits_long(&s->gb, num_fill_bits);
01137 }
01138 }
01139
01141 if (get_bits1(&s->gb)) {
01142 av_log_ask_for_sample(s->avctx, "reserved bit set\n");
01143 return AVERROR_INVALIDDATA;
01144 }
01145
01146
01147 if (decode_channel_transform(s) < 0)
01148 return AVERROR_INVALIDDATA;
01149
01150
01151 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01152 int c = s->channel_indexes_for_cur_subframe[i];
01153 if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
01154 transmit_coeffs = 1;
01155 }
01156
01157 if (transmit_coeffs) {
01158 int step;
01159 int quant_step = 90 * s->bits_per_sample >> 4;
01160
01162 if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
01163 int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
01164 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01165 int c = s->channel_indexes_for_cur_subframe[i];
01166 int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
01167 if (num_vec_coeffs > WMAPRO_BLOCK_MAX_SIZE) {
01168 av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
01169 return AVERROR_INVALIDDATA;
01170 }
01171 s->channel[c].num_vec_coeffs = num_vec_coeffs;
01172 }
01173 } else {
01174 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01175 int c = s->channel_indexes_for_cur_subframe[i];
01176 s->channel[c].num_vec_coeffs = s->subframe_len;
01177 }
01178 }
01180 step = get_sbits(&s->gb, 6);
01181 quant_step += step;
01182 if (step == -32 || step == 31) {
01183 const int sign = (step == 31) - 1;
01184 int quant = 0;
01185 while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
01186 (step = get_bits(&s->gb, 5)) == 31) {
01187 quant += 31;
01188 }
01189 quant_step += ((quant + step) ^ sign) - sign;
01190 }
01191 if (quant_step < 0) {
01192 av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
01193 }
01194
01197 if (s->channels_for_cur_subframe == 1) {
01198 s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
01199 } else {
01200 int modifier_len = get_bits(&s->gb, 3);
01201 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01202 int c = s->channel_indexes_for_cur_subframe[i];
01203 s->channel[c].quant_step = quant_step;
01204 if (get_bits1(&s->gb)) {
01205 if (modifier_len) {
01206 s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
01207 } else
01208 ++s->channel[c].quant_step;
01209 }
01210 }
01211 }
01212
01214 if (decode_scale_factors(s) < 0)
01215 return AVERROR_INVALIDDATA;
01216 }
01217
01218 av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
01219 get_bits_count(&s->gb) - s->subframe_offset);
01220
01222 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01223 int c = s->channel_indexes_for_cur_subframe[i];
01224 if (s->channel[c].transmit_coefs &&
01225 get_bits_count(&s->gb) < s->num_saved_bits) {
01226 decode_coeffs(s, c);
01227 } else
01228 memset(s->channel[c].coeffs, 0,
01229 sizeof(*s->channel[c].coeffs) * subframe_len);
01230 }
01231
01232 av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
01233 get_bits_count(&s->gb) - s->subframe_offset);
01234
01235 if (transmit_coeffs) {
01236 FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
01238 inverse_channel_transform(s);
01239 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01240 int c = s->channel_indexes_for_cur_subframe[i];
01241 const int* sf = s->channel[c].scale_factors;
01242 int b;
01243
01244 if (c == s->lfe_channel)
01245 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
01246 (subframe_len - cur_subwoofer_cutoff));
01247
01249 for (b = 0; b < s->num_bands; b++) {
01250 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
01251 const int exp = s->channel[c].quant_step -
01252 (s->channel[c].max_scale_factor - *sf++) *
01253 s->channel[c].scale_factor_step;
01254 const float quant = pow(10.0, exp / 20.0);
01255 int start = s->cur_sfb_offsets[b];
01256 s->dsp.vector_fmul_scalar(s->tmp + start,
01257 s->channel[c].coeffs + start,
01258 quant, end - start);
01259 }
01260
01262 mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
01263 }
01264 }
01265
01267 wmapro_window(s);
01268
01270 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01271 int c = s->channel_indexes_for_cur_subframe[i];
01272 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
01273 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
01274 return AVERROR_INVALIDDATA;
01275 }
01276 ++s->channel[c].cur_subframe;
01277 }
01278
01279 return 0;
01280 }
01281
01288 static int decode_frame(WMAProDecodeCtx *s)
01289 {
01290 GetBitContext* gb = &s->gb;
01291 int more_frames = 0;
01292 int len = 0;
01293 int i;
01294
01296 if (s->num_channels * s->samples_per_frame > s->samples_end - s->samples) {
01298 av_log(s->avctx, AV_LOG_ERROR,
01299 "not enough space for the output samples\n");
01300 s->packet_loss = 1;
01301 return 0;
01302 }
01303
01305 if (s->len_prefix)
01306 len = get_bits(gb, s->log2_frame_size);
01307
01308 av_dlog(s->avctx, "decoding frame with length %x\n", len);
01309
01311 if (decode_tilehdr(s)) {
01312 s->packet_loss = 1;
01313 return 0;
01314 }
01315
01317 if (s->num_channels > 1 && get_bits1(gb)) {
01318 if (get_bits1(gb)) {
01319 for (i = 0; i < s->num_channels * s->num_channels; i++)
01320 skip_bits(gb, 4);
01321 }
01322 }
01323
01325 if (s->dynamic_range_compression) {
01326 s->drc_gain = get_bits(gb, 8);
01327 av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
01328 }
01329
01332 if (get_bits1(gb)) {
01333 int av_unused skip;
01334
01336 if (get_bits1(gb)) {
01337 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01338 av_dlog(s->avctx, "start skip: %i\n", skip);
01339 }
01340
01342 if (get_bits1(gb)) {
01343 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01344 av_dlog(s->avctx, "end skip: %i\n", skip);
01345 }
01346
01347 }
01348
01349 av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
01350 get_bits_count(gb) - s->frame_offset);
01351
01353 s->parsed_all_subframes = 0;
01354 for (i = 0; i < s->num_channels; i++) {
01355 s->channel[i].decoded_samples = 0;
01356 s->channel[i].cur_subframe = 0;
01357 s->channel[i].reuse_sf = 0;
01358 }
01359
01361 while (!s->parsed_all_subframes) {
01362 if (decode_subframe(s) < 0) {
01363 s->packet_loss = 1;
01364 return 0;
01365 }
01366 }
01367
01369 for (i = 0; i < s->num_channels; i++) {
01370 float* ptr = s->samples + i;
01371 int incr = s->num_channels;
01372 float* iptr = s->channel[i].out;
01373 float* iend = iptr + s->samples_per_frame;
01374
01375
01376 while (iptr < iend) {
01377 *ptr = *iptr++;
01378 ptr += incr;
01379 }
01380
01382 memcpy(&s->channel[i].out[0],
01383 &s->channel[i].out[s->samples_per_frame],
01384 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
01385 }
01386
01387 if (s->skip_frame) {
01388 s->skip_frame = 0;
01389 } else
01390 s->samples += s->num_channels * s->samples_per_frame;
01391
01392 if (s->len_prefix) {
01393 if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
01395 av_log(s->avctx, AV_LOG_ERROR,
01396 "frame[%i] would have to skip %i bits\n", s->frame_num,
01397 len - (get_bits_count(gb) - s->frame_offset) - 1);
01398 s->packet_loss = 1;
01399 return 0;
01400 }
01401
01403 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
01404 } else {
01405 while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
01406 }
01407 }
01408
01410 more_frames = get_bits1(gb);
01411
01412 ++s->frame_num;
01413 return more_frames;
01414 }
01415
01422 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
01423 {
01424 return s->buf_bit_size - get_bits_count(gb);
01425 }
01426
01434 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
01435 int append)
01436 {
01437 int buflen;
01438
01443 if (!append) {
01444 s->frame_offset = get_bits_count(gb) & 7;
01445 s->num_saved_bits = s->frame_offset;
01446 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
01447 }
01448
01449 buflen = (put_bits_count(&s->pb) + len + 8) >> 3;
01450
01451 if (len <= 0 || buflen > MAX_FRAMESIZE) {
01452 av_log_ask_for_sample(s->avctx, "input buffer too small\n");
01453 s->packet_loss = 1;
01454 return;
01455 }
01456
01457 s->num_saved_bits += len;
01458 if (!append) {
01459 ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
01460 s->num_saved_bits);
01461 } else {
01462 int align = 8 - (get_bits_count(gb) & 7);
01463 align = FFMIN(align, len);
01464 put_bits(&s->pb, align, get_bits(gb, align));
01465 len -= align;
01466 ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
01467 }
01468 skip_bits_long(gb, len);
01469
01470 {
01471 PutBitContext tmp = s->pb;
01472 flush_put_bits(&tmp);
01473 }
01474
01475 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
01476 skip_bits(&s->gb, s->frame_offset);
01477 }
01478
01487 static int decode_packet(AVCodecContext *avctx,
01488 void *data, int *data_size, AVPacket* avpkt)
01489 {
01490 WMAProDecodeCtx *s = avctx->priv_data;
01491 GetBitContext* gb = &s->pgb;
01492 const uint8_t* buf = avpkt->data;
01493 int buf_size = avpkt->size;
01494 int num_bits_prev_frame;
01495 int packet_sequence_number;
01496
01497 s->samples = data;
01498 s->samples_end = (float*)((int8_t*)data + *data_size);
01499 *data_size = 0;
01500
01501 if (s->packet_done || s->packet_loss) {
01502 s->packet_done = 0;
01503
01505 if (buf_size < avctx->block_align)
01506 return 0;
01507
01508 s->next_packet_start = buf_size - avctx->block_align;
01509 buf_size = avctx->block_align;
01510 s->buf_bit_size = buf_size << 3;
01511
01513 init_get_bits(gb, buf, s->buf_bit_size);
01514 packet_sequence_number = get_bits(gb, 4);
01515 skip_bits(gb, 2);
01516
01518 num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
01519 av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
01520 num_bits_prev_frame);
01521
01523 if (!s->packet_loss &&
01524 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
01525 s->packet_loss = 1;
01526 av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
01527 s->packet_sequence_number, packet_sequence_number);
01528 }
01529 s->packet_sequence_number = packet_sequence_number;
01530
01531 if (num_bits_prev_frame > 0) {
01532 int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
01533 if (num_bits_prev_frame >= remaining_packet_bits) {
01534 num_bits_prev_frame = remaining_packet_bits;
01535 s->packet_done = 1;
01536 }
01537
01540 save_bits(s, gb, num_bits_prev_frame, 1);
01541 av_dlog(avctx, "accumulated %x bits of frame data\n",
01542 s->num_saved_bits - s->frame_offset);
01543
01545 if (!s->packet_loss)
01546 decode_frame(s);
01547 } else if (s->num_saved_bits - s->frame_offset) {
01548 av_dlog(avctx, "ignoring %x previously saved bits\n",
01549 s->num_saved_bits - s->frame_offset);
01550 }
01551
01552 if (s->packet_loss) {
01556 s->num_saved_bits = 0;
01557 s->packet_loss = 0;
01558 }
01559
01560 } else {
01561 int frame_size;
01562 s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
01563 init_get_bits(gb, avpkt->data, s->buf_bit_size);
01564 skip_bits(gb, s->packet_offset);
01565 if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
01566 (frame_size = show_bits(gb, s->log2_frame_size)) &&
01567 frame_size <= remaining_bits(s, gb)) {
01568 save_bits(s, gb, frame_size, 0);
01569 s->packet_done = !decode_frame(s);
01570 } else if (!s->len_prefix
01571 && s->num_saved_bits > get_bits_count(&s->gb)) {
01579 s->packet_done = !decode_frame(s);
01580 } else
01581 s->packet_done = 1;
01582 }
01583
01584 if (s->packet_done && !s->packet_loss &&
01585 remaining_bits(s, gb) > 0) {
01588 save_bits(s, gb, remaining_bits(s, gb), 0);
01589 }
01590
01591 *data_size = (int8_t *)s->samples - (int8_t *)data;
01592 s->packet_offset = get_bits_count(gb) & 7;
01593
01594 return (s->packet_loss) ? AVERROR_INVALIDDATA : get_bits_count(gb) >> 3;
01595 }
01596
01601 static void flush(AVCodecContext *avctx)
01602 {
01603 WMAProDecodeCtx *s = avctx->priv_data;
01604 int i;
01607 for (i = 0; i < s->num_channels; i++)
01608 memset(s->channel[i].out, 0, s->samples_per_frame *
01609 sizeof(*s->channel[i].out));
01610 s->packet_loss = 1;
01611 }
01612
01613
01617 AVCodec ff_wmapro_decoder = {
01618 "wmapro",
01619 AVMEDIA_TYPE_AUDIO,
01620 CODEC_ID_WMAPRO,
01621 sizeof(WMAProDecodeCtx),
01622 decode_init,
01623 NULL,
01624 decode_end,
01625 decode_packet,
01626 .capabilities = CODEC_CAP_SUBFRAMES,
01627 .flush= flush,
01628 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
01629 };