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00089 #include "libavutil/float_dsp.h"
00090 #include "libavutil/intfloat.h"
00091 #include "libavutil/intreadwrite.h"
00092 #include "avcodec.h"
00093 #include "internal.h"
00094 #include "get_bits.h"
00095 #include "put_bits.h"
00096 #include "wmaprodata.h"
00097 #include "dsputil.h"
00098 #include "sinewin.h"
00099 #include "wma.h"
00100 #include "wma_common.h"
00101
00103 #define WMAPRO_MAX_CHANNELS 8
00104 #define MAX_SUBFRAMES 32
00105 #define MAX_BANDS 29
00106 #define MAX_FRAMESIZE 32768
00107
00108 #define WMAPRO_BLOCK_MIN_BITS 6
00109 #define WMAPRO_BLOCK_MAX_BITS 13
00110 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS)
00111 #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1)
00112
00113
00114 #define VLCBITS 9
00115 #define SCALEVLCBITS 8
00116 #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS)
00117 #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS)
00118 #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS)
00119 #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS)
00120 #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS)
00121
00122 static VLC sf_vlc;
00123 static VLC sf_rl_vlc;
00124 static VLC vec4_vlc;
00125 static VLC vec2_vlc;
00126 static VLC vec1_vlc;
00127 static VLC coef_vlc[2];
00128 static float sin64[33];
00129
00133 typedef struct {
00134 int16_t prev_block_len;
00135 uint8_t transmit_coefs;
00136 uint8_t num_subframes;
00137 uint16_t subframe_len[MAX_SUBFRAMES];
00138 uint16_t subframe_offset[MAX_SUBFRAMES];
00139 uint8_t cur_subframe;
00140 uint16_t decoded_samples;
00141 uint8_t grouped;
00142 int quant_step;
00143 int8_t reuse_sf;
00144 int8_t scale_factor_step;
00145 int max_scale_factor;
00146 int saved_scale_factors[2][MAX_BANDS];
00147 int8_t scale_factor_idx;
00148 int* scale_factors;
00149 uint8_t table_idx;
00150 float* coeffs;
00151 uint16_t num_vec_coeffs;
00152 DECLARE_ALIGNED(32, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2];
00153 } WMAProChannelCtx;
00154
00158 typedef struct {
00159 uint8_t num_channels;
00160 int8_t transform;
00161 int8_t transform_band[MAX_BANDS];
00162 float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS];
00163 float* channel_data[WMAPRO_MAX_CHANNELS];
00164 } WMAProChannelGrp;
00165
00169 typedef struct WMAProDecodeCtx {
00170
00171 AVCodecContext* avctx;
00172 AVFrame frame;
00173 DSPContext dsp;
00174 AVFloatDSPContext fdsp;
00175 uint8_t frame_data[MAX_FRAMESIZE +
00176 FF_INPUT_BUFFER_PADDING_SIZE];
00177 PutBitContext pb;
00178 FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES];
00179 DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE];
00180 float* windows[WMAPRO_BLOCK_SIZES];
00181
00182
00183 uint32_t decode_flags;
00184 uint8_t len_prefix;
00185 uint8_t dynamic_range_compression;
00186 uint8_t bits_per_sample;
00187 uint16_t samples_per_frame;
00188 uint16_t log2_frame_size;
00189 int8_t lfe_channel;
00190 uint8_t max_num_subframes;
00191 uint8_t subframe_len_bits;
00192 uint8_t max_subframe_len_bit;
00193 uint16_t min_samples_per_subframe;
00194 int8_t num_sfb[WMAPRO_BLOCK_SIZES];
00195 int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS];
00196 int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS];
00197 int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES];
00198
00199
00200 GetBitContext pgb;
00201 int next_packet_start;
00202 uint8_t packet_offset;
00203 uint8_t packet_sequence_number;
00204 int num_saved_bits;
00205 int frame_offset;
00206 int subframe_offset;
00207 uint8_t packet_loss;
00208 uint8_t packet_done;
00209
00210
00211 uint32_t frame_num;
00212 GetBitContext gb;
00213 int buf_bit_size;
00214 uint8_t drc_gain;
00215 int8_t skip_frame;
00216 int8_t parsed_all_subframes;
00217
00218
00219 int16_t subframe_len;
00220 int8_t channels_for_cur_subframe;
00221 int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS];
00222 int8_t num_bands;
00223 int8_t transmit_num_vec_coeffs;
00224 int16_t* cur_sfb_offsets;
00225 uint8_t table_idx;
00226 int8_t esc_len;
00227
00228 uint8_t num_chgroups;
00229 WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS];
00230
00231 WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS];
00232 } WMAProDecodeCtx;
00233
00234
00239 static av_cold void dump_context(WMAProDecodeCtx *s)
00240 {
00241 #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
00242 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b);
00243
00244 PRINT("ed sample bit depth", s->bits_per_sample);
00245 PRINT_HEX("ed decode flags", s->decode_flags);
00246 PRINT("samples per frame", s->samples_per_frame);
00247 PRINT("log2 frame size", s->log2_frame_size);
00248 PRINT("max num subframes", s->max_num_subframes);
00249 PRINT("len prefix", s->len_prefix);
00250 PRINT("num channels", s->avctx->channels);
00251 }
00252
00258 static av_cold int decode_end(AVCodecContext *avctx)
00259 {
00260 WMAProDecodeCtx *s = avctx->priv_data;
00261 int i;
00262
00263 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00264 ff_mdct_end(&s->mdct_ctx[i]);
00265
00266 return 0;
00267 }
00268
00274 static av_cold int decode_init(AVCodecContext *avctx)
00275 {
00276 WMAProDecodeCtx *s = avctx->priv_data;
00277 uint8_t *edata_ptr = avctx->extradata;
00278 unsigned int channel_mask;
00279 int i, bits;
00280 int log2_max_num_subframes;
00281 int num_possible_block_sizes;
00282
00283 s->avctx = avctx;
00284 ff_dsputil_init(&s->dsp, avctx);
00285 avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
00286
00287 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
00288
00289 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
00290
00291 if (avctx->extradata_size >= 18) {
00292 s->decode_flags = AV_RL16(edata_ptr+14);
00293 channel_mask = AV_RL32(edata_ptr+2);
00294 s->bits_per_sample = AV_RL16(edata_ptr);
00296 for (i = 0; i < avctx->extradata_size; i++)
00297 av_dlog(avctx, "[%x] ", avctx->extradata[i]);
00298 av_dlog(avctx, "\n");
00299
00300 } else {
00301 av_log_ask_for_sample(avctx, "Unknown extradata size\n");
00302 return AVERROR_INVALIDDATA;
00303 }
00304
00306 s->log2_frame_size = av_log2(avctx->block_align) + 4;
00307
00309 s->skip_frame = 1;
00310 s->packet_loss = 1;
00311 s->len_prefix = (s->decode_flags & 0x40);
00312
00314 bits = ff_wma_get_frame_len_bits(avctx->sample_rate, 3, s->decode_flags);
00315 if (bits > WMAPRO_BLOCK_MAX_BITS) {
00316 av_log_missing_feature(avctx, "14-bits block sizes", 1);
00317 return AVERROR_PATCHWELCOME;
00318 }
00319 s->samples_per_frame = 1 << bits;
00320
00322 log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
00323 s->max_num_subframes = 1 << log2_max_num_subframes;
00324 if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
00325 s->max_subframe_len_bit = 1;
00326 s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
00327
00328 num_possible_block_sizes = log2_max_num_subframes + 1;
00329 s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
00330 s->dynamic_range_compression = (s->decode_flags & 0x80);
00331
00332 if (s->max_num_subframes > MAX_SUBFRAMES) {
00333 av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n",
00334 s->max_num_subframes);
00335 return AVERROR_INVALIDDATA;
00336 }
00337
00338 if (s->min_samples_per_subframe < (1<<WMAPRO_BLOCK_MIN_BITS)) {
00339 av_log(avctx, AV_LOG_ERROR, "min_samples_per_subframe of %d too small\n",
00340 s->min_samples_per_subframe);
00341 return AVERROR_INVALIDDATA;
00342 }
00343
00344 if (s->avctx->sample_rate <= 0) {
00345 av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
00346 return AVERROR_INVALIDDATA;
00347 }
00348
00349 if (avctx->channels < 0) {
00350 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n",
00351 avctx->channels);
00352 return AVERROR_INVALIDDATA;
00353 } else if (avctx->channels > WMAPRO_MAX_CHANNELS) {
00354 av_log_ask_for_sample(avctx, "unsupported number of channels\n");
00355 return AVERROR_PATCHWELCOME;
00356 }
00357
00359 for (i = 0; i < avctx->channels; i++)
00360 s->channel[i].prev_block_len = s->samples_per_frame;
00361
00363 s->lfe_channel = -1;
00364
00365 if (channel_mask & 8) {
00366 unsigned int mask;
00367 for (mask = 1; mask < 16; mask <<= 1) {
00368 if (channel_mask & mask)
00369 ++s->lfe_channel;
00370 }
00371 }
00372
00373 INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
00374 scale_huffbits, 1, 1,
00375 scale_huffcodes, 2, 2, 616);
00376
00377 INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
00378 scale_rl_huffbits, 1, 1,
00379 scale_rl_huffcodes, 4, 4, 1406);
00380
00381 INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
00382 coef0_huffbits, 1, 1,
00383 coef0_huffcodes, 4, 4, 2108);
00384
00385 INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
00386 coef1_huffbits, 1, 1,
00387 coef1_huffcodes, 4, 4, 3912);
00388
00389 INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
00390 vec4_huffbits, 1, 1,
00391 vec4_huffcodes, 2, 2, 604);
00392
00393 INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
00394 vec2_huffbits, 1, 1,
00395 vec2_huffcodes, 2, 2, 562);
00396
00397 INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
00398 vec1_huffbits, 1, 1,
00399 vec1_huffcodes, 2, 2, 562);
00400
00403 for (i = 0; i < num_possible_block_sizes; i++) {
00404 int subframe_len = s->samples_per_frame >> i;
00405 int x;
00406 int band = 1;
00407
00408 s->sfb_offsets[i][0] = 0;
00409
00410 for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
00411 int offset = (subframe_len * 2 * critical_freq[x])
00412 / s->avctx->sample_rate + 2;
00413 offset &= ~3;
00414 if (offset > s->sfb_offsets[i][band - 1])
00415 s->sfb_offsets[i][band++] = offset;
00416 }
00417 s->sfb_offsets[i][band - 1] = subframe_len;
00418 s->num_sfb[i] = band - 1;
00419 if (s->num_sfb[i] <= 0) {
00420 av_log(avctx, AV_LOG_ERROR, "num_sfb invalid\n");
00421 return AVERROR_INVALIDDATA;
00422 }
00423 }
00424
00425
00431 for (i = 0; i < num_possible_block_sizes; i++) {
00432 int b;
00433 for (b = 0; b < s->num_sfb[i]; b++) {
00434 int x;
00435 int offset = ((s->sfb_offsets[i][b]
00436 + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
00437 for (x = 0; x < num_possible_block_sizes; x++) {
00438 int v = 0;
00439 while (s->sfb_offsets[x][v + 1] << x < offset)
00440 ++v;
00441 s->sf_offsets[i][x][b] = v;
00442 }
00443 }
00444 }
00445
00447 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00448 ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
00449 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
00450 / (1 << (s->bits_per_sample - 1)));
00451
00453 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
00454 const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
00455 ff_init_ff_sine_windows(win_idx);
00456 s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
00457 }
00458
00460 for (i = 0; i < num_possible_block_sizes; i++) {
00461 int block_size = s->samples_per_frame >> i;
00462 int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
00463 / s->avctx->sample_rate;
00464 s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
00465 }
00466
00468 for (i = 0; i < 33; i++)
00469 sin64[i] = sin(i*M_PI / 64.0);
00470
00471 if (avctx->debug & FF_DEBUG_BITSTREAM)
00472 dump_context(s);
00473
00474 avctx->channel_layout = channel_mask;
00475
00476 avcodec_get_frame_defaults(&s->frame);
00477 avctx->coded_frame = &s->frame;
00478
00479 return 0;
00480 }
00481
00488 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
00489 {
00490 int frame_len_shift = 0;
00491 int subframe_len;
00492
00494 if (offset == s->samples_per_frame - s->min_samples_per_subframe)
00495 return s->min_samples_per_subframe;
00496
00498 if (s->max_subframe_len_bit) {
00499 if (get_bits1(&s->gb))
00500 frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
00501 } else
00502 frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
00503
00504 subframe_len = s->samples_per_frame >> frame_len_shift;
00505
00507 if (subframe_len < s->min_samples_per_subframe ||
00508 subframe_len > s->samples_per_frame) {
00509 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
00510 subframe_len);
00511 return AVERROR_INVALIDDATA;
00512 }
00513 return subframe_len;
00514 }
00515
00536 static int decode_tilehdr(WMAProDecodeCtx *s)
00537 {
00538 uint16_t num_samples[WMAPRO_MAX_CHANNELS] = { 0 };
00539 uint8_t contains_subframe[WMAPRO_MAX_CHANNELS];
00540 int channels_for_cur_subframe = s->avctx->channels;
00541 int fixed_channel_layout = 0;
00542 int min_channel_len = 0;
00543 int c;
00544
00545
00546
00547
00548
00549
00550
00552 for (c = 0; c < s->avctx->channels; c++)
00553 s->channel[c].num_subframes = 0;
00554
00555 if (s->max_num_subframes == 1 || get_bits1(&s->gb))
00556 fixed_channel_layout = 1;
00557
00559 do {
00560 int subframe_len;
00561
00563 for (c = 0; c < s->avctx->channels; c++) {
00564 if (num_samples[c] == min_channel_len) {
00565 if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
00566 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
00567 contains_subframe[c] = 1;
00568 else
00569 contains_subframe[c] = get_bits1(&s->gb);
00570 } else
00571 contains_subframe[c] = 0;
00572 }
00573
00575 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
00576 return AVERROR_INVALIDDATA;
00577
00579 min_channel_len += subframe_len;
00580 for (c = 0; c < s->avctx->channels; c++) {
00581 WMAProChannelCtx* chan = &s->channel[c];
00582
00583 if (contains_subframe[c]) {
00584 if (chan->num_subframes >= MAX_SUBFRAMES) {
00585 av_log(s->avctx, AV_LOG_ERROR,
00586 "broken frame: num subframes > 31\n");
00587 return AVERROR_INVALIDDATA;
00588 }
00589 chan->subframe_len[chan->num_subframes] = subframe_len;
00590 num_samples[c] += subframe_len;
00591 ++chan->num_subframes;
00592 if (num_samples[c] > s->samples_per_frame) {
00593 av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
00594 "channel len > samples_per_frame\n");
00595 return AVERROR_INVALIDDATA;
00596 }
00597 } else if (num_samples[c] <= min_channel_len) {
00598 if (num_samples[c] < min_channel_len) {
00599 channels_for_cur_subframe = 0;
00600 min_channel_len = num_samples[c];
00601 }
00602 ++channels_for_cur_subframe;
00603 }
00604 }
00605 } while (min_channel_len < s->samples_per_frame);
00606
00607 for (c = 0; c < s->avctx->channels; c++) {
00608 int i;
00609 int offset = 0;
00610 for (i = 0; i < s->channel[c].num_subframes; i++) {
00611 av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
00612 " len %i\n", s->frame_num, c, i,
00613 s->channel[c].subframe_len[i]);
00614 s->channel[c].subframe_offset[i] = offset;
00615 offset += s->channel[c].subframe_len[i];
00616 }
00617 }
00618
00619 return 0;
00620 }
00621
00627 static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
00628 WMAProChannelGrp *chgroup)
00629 {
00630 int i;
00631 int offset = 0;
00632 int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
00633 memset(chgroup->decorrelation_matrix, 0, s->avctx->channels *
00634 s->avctx->channels * sizeof(*chgroup->decorrelation_matrix));
00635
00636 for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
00637 rotation_offset[i] = get_bits(&s->gb, 6);
00638
00639 for (i = 0; i < chgroup->num_channels; i++)
00640 chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
00641 get_bits1(&s->gb) ? 1.0 : -1.0;
00642
00643 for (i = 1; i < chgroup->num_channels; i++) {
00644 int x;
00645 for (x = 0; x < i; x++) {
00646 int y;
00647 for (y = 0; y < i + 1; y++) {
00648 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
00649 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
00650 int n = rotation_offset[offset + x];
00651 float sinv;
00652 float cosv;
00653
00654 if (n < 32) {
00655 sinv = sin64[n];
00656 cosv = sin64[32 - n];
00657 } else {
00658 sinv = sin64[64 - n];
00659 cosv = -sin64[n - 32];
00660 }
00661
00662 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
00663 (v1 * sinv) - (v2 * cosv);
00664 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
00665 (v1 * cosv) + (v2 * sinv);
00666 }
00667 }
00668 offset += i;
00669 }
00670 }
00671
00677 static int decode_channel_transform(WMAProDecodeCtx* s)
00678 {
00679 int i;
00680
00681
00682
00683
00684
00686 s->num_chgroups = 0;
00687 if (s->avctx->channels > 1) {
00688 int remaining_channels = s->channels_for_cur_subframe;
00689
00690 if (get_bits1(&s->gb)) {
00691 av_log_ask_for_sample(s->avctx,
00692 "unsupported channel transform bit\n");
00693 return AVERROR_INVALIDDATA;
00694 }
00695
00696 for (s->num_chgroups = 0; remaining_channels &&
00697 s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
00698 WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
00699 float** channel_data = chgroup->channel_data;
00700 chgroup->num_channels = 0;
00701 chgroup->transform = 0;
00702
00704 if (remaining_channels > 2) {
00705 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00706 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00707 if (!s->channel[channel_idx].grouped
00708 && get_bits1(&s->gb)) {
00709 ++chgroup->num_channels;
00710 s->channel[channel_idx].grouped = 1;
00711 *channel_data++ = s->channel[channel_idx].coeffs;
00712 }
00713 }
00714 } else {
00715 chgroup->num_channels = remaining_channels;
00716 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00717 int channel_idx = s->channel_indexes_for_cur_subframe[i];
00718 if (!s->channel[channel_idx].grouped)
00719 *channel_data++ = s->channel[channel_idx].coeffs;
00720 s->channel[channel_idx].grouped = 1;
00721 }
00722 }
00723
00725 if (chgroup->num_channels == 2) {
00726 if (get_bits1(&s->gb)) {
00727 if (get_bits1(&s->gb)) {
00728 av_log_ask_for_sample(s->avctx,
00729 "unsupported channel transform type\n");
00730 }
00731 } else {
00732 chgroup->transform = 1;
00733 if (s->avctx->channels == 2) {
00734 chgroup->decorrelation_matrix[0] = 1.0;
00735 chgroup->decorrelation_matrix[1] = -1.0;
00736 chgroup->decorrelation_matrix[2] = 1.0;
00737 chgroup->decorrelation_matrix[3] = 1.0;
00738 } else {
00740 chgroup->decorrelation_matrix[0] = 0.70703125;
00741 chgroup->decorrelation_matrix[1] = -0.70703125;
00742 chgroup->decorrelation_matrix[2] = 0.70703125;
00743 chgroup->decorrelation_matrix[3] = 0.70703125;
00744 }
00745 }
00746 } else if (chgroup->num_channels > 2) {
00747 if (get_bits1(&s->gb)) {
00748 chgroup->transform = 1;
00749 if (get_bits1(&s->gb)) {
00750 decode_decorrelation_matrix(s, chgroup);
00751 } else {
00753 if (chgroup->num_channels > 6) {
00754 av_log_ask_for_sample(s->avctx,
00755 "coupled channels > 6\n");
00756 } else {
00757 memcpy(chgroup->decorrelation_matrix,
00758 default_decorrelation[chgroup->num_channels],
00759 chgroup->num_channels * chgroup->num_channels *
00760 sizeof(*chgroup->decorrelation_matrix));
00761 }
00762 }
00763 }
00764 }
00765
00767 if (chgroup->transform) {
00768 if (!get_bits1(&s->gb)) {
00769 int i;
00771 for (i = 0; i < s->num_bands; i++) {
00772 chgroup->transform_band[i] = get_bits1(&s->gb);
00773 }
00774 } else {
00775 memset(chgroup->transform_band, 1, s->num_bands);
00776 }
00777 }
00778 remaining_channels -= chgroup->num_channels;
00779 }
00780 }
00781 return 0;
00782 }
00783
00790 static int decode_coeffs(WMAProDecodeCtx *s, int c)
00791 {
00792
00793
00794
00795 static const uint32_t fval_tab[16] = {
00796 0x00000000, 0x3f800000, 0x40000000, 0x40400000,
00797 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
00798 0x41000000, 0x41100000, 0x41200000, 0x41300000,
00799 0x41400000, 0x41500000, 0x41600000, 0x41700000,
00800 };
00801 int vlctable;
00802 VLC* vlc;
00803 WMAProChannelCtx* ci = &s->channel[c];
00804 int rl_mode = 0;
00805 int cur_coeff = 0;
00806 int num_zeros = 0;
00807 const uint16_t* run;
00808 const float* level;
00809
00810 av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
00811
00812 vlctable = get_bits1(&s->gb);
00813 vlc = &coef_vlc[vlctable];
00814
00815 if (vlctable) {
00816 run = coef1_run;
00817 level = coef1_level;
00818 } else {
00819 run = coef0_run;
00820 level = coef0_level;
00821 }
00822
00825 while ((s->transmit_num_vec_coeffs || !rl_mode) &&
00826 (cur_coeff + 3 < ci->num_vec_coeffs)) {
00827 uint32_t vals[4];
00828 int i;
00829 unsigned int idx;
00830
00831 idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
00832
00833 if (idx == HUFF_VEC4_SIZE - 1) {
00834 for (i = 0; i < 4; i += 2) {
00835 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
00836 if (idx == HUFF_VEC2_SIZE - 1) {
00837 uint32_t v0, v1;
00838 v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00839 if (v0 == HUFF_VEC1_SIZE - 1)
00840 v0 += ff_wma_get_large_val(&s->gb);
00841 v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00842 if (v1 == HUFF_VEC1_SIZE - 1)
00843 v1 += ff_wma_get_large_val(&s->gb);
00844 vals[i ] = av_float2int(v0);
00845 vals[i+1] = av_float2int(v1);
00846 } else {
00847 vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ];
00848 vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
00849 }
00850 }
00851 } else {
00852 vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ];
00853 vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
00854 vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
00855 vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF];
00856 }
00857
00859 for (i = 0; i < 4; i++) {
00860 if (vals[i]) {
00861 uint32_t sign = get_bits1(&s->gb) - 1;
00862 AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
00863 num_zeros = 0;
00864 } else {
00865 ci->coeffs[cur_coeff] = 0;
00868 rl_mode |= (++num_zeros > s->subframe_len >> 8);
00869 }
00870 ++cur_coeff;
00871 }
00872 }
00873
00875 if (cur_coeff < s->subframe_len) {
00876 memset(&ci->coeffs[cur_coeff], 0,
00877 sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
00878 if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
00879 level, run, 1, ci->coeffs,
00880 cur_coeff, s->subframe_len,
00881 s->subframe_len, s->esc_len, 0))
00882 return AVERROR_INVALIDDATA;
00883 }
00884
00885 return 0;
00886 }
00887
00893 static int decode_scale_factors(WMAProDecodeCtx* s)
00894 {
00895 int i;
00896
00901 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00902 int c = s->channel_indexes_for_cur_subframe[i];
00903 int* sf;
00904 int* sf_end;
00905 s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
00906 sf_end = s->channel[c].scale_factors + s->num_bands;
00907
00913 if (s->channel[c].reuse_sf) {
00914 const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
00915 int b;
00916 for (b = 0; b < s->num_bands; b++)
00917 s->channel[c].scale_factors[b] =
00918 s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
00919 }
00920
00921 if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
00922
00923 if (!s->channel[c].reuse_sf) {
00924 int val;
00926 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
00927 val = 45 / s->channel[c].scale_factor_step;
00928 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
00929 val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
00930 *sf = val;
00931 }
00932 } else {
00933 int i;
00935 for (i = 0; i < s->num_bands; i++) {
00936 int idx;
00937 int skip;
00938 int val;
00939 int sign;
00940
00941 idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
00942
00943 if (!idx) {
00944 uint32_t code = get_bits(&s->gb, 14);
00945 val = code >> 6;
00946 sign = (code & 1) - 1;
00947 skip = (code & 0x3f) >> 1;
00948 } else if (idx == 1) {
00949 break;
00950 } else {
00951 skip = scale_rl_run[idx];
00952 val = scale_rl_level[idx];
00953 sign = get_bits1(&s->gb)-1;
00954 }
00955
00956 i += skip;
00957 if (i >= s->num_bands) {
00958 av_log(s->avctx, AV_LOG_ERROR,
00959 "invalid scale factor coding\n");
00960 return AVERROR_INVALIDDATA;
00961 }
00962 s->channel[c].scale_factors[i] += (val ^ sign) - sign;
00963 }
00964 }
00966 s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
00967 s->channel[c].table_idx = s->table_idx;
00968 s->channel[c].reuse_sf = 1;
00969 }
00970
00972 s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
00973 for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
00974 s->channel[c].max_scale_factor =
00975 FFMAX(s->channel[c].max_scale_factor, *sf);
00976 }
00977
00978 }
00979 return 0;
00980 }
00981
00986 static void inverse_channel_transform(WMAProDecodeCtx *s)
00987 {
00988 int i;
00989
00990 for (i = 0; i < s->num_chgroups; i++) {
00991 if (s->chgroup[i].transform) {
00992 float data[WMAPRO_MAX_CHANNELS];
00993 const int num_channels = s->chgroup[i].num_channels;
00994 float** ch_data = s->chgroup[i].channel_data;
00995 float** ch_end = ch_data + num_channels;
00996 const int8_t* tb = s->chgroup[i].transform_band;
00997 int16_t* sfb;
00998
01000 for (sfb = s->cur_sfb_offsets;
01001 sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
01002 int y;
01003 if (*tb++ == 1) {
01005 for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
01006 const float* mat = s->chgroup[i].decorrelation_matrix;
01007 const float* data_end = data + num_channels;
01008 float* data_ptr = data;
01009 float** ch;
01010
01011 for (ch = ch_data; ch < ch_end; ch++)
01012 *data_ptr++ = (*ch)[y];
01013
01014 for (ch = ch_data; ch < ch_end; ch++) {
01015 float sum = 0;
01016 data_ptr = data;
01017 while (data_ptr < data_end)
01018 sum += *data_ptr++ * *mat++;
01019
01020 (*ch)[y] = sum;
01021 }
01022 }
01023 } else if (s->avctx->channels == 2) {
01024 int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
01025 s->fdsp.vector_fmul_scalar(ch_data[0] + sfb[0],
01026 ch_data[0] + sfb[0],
01027 181.0 / 128, len);
01028 s->fdsp.vector_fmul_scalar(ch_data[1] + sfb[0],
01029 ch_data[1] + sfb[0],
01030 181.0 / 128, len);
01031 }
01032 }
01033 }
01034 }
01035 }
01036
01041 static void wmapro_window(WMAProDecodeCtx *s)
01042 {
01043 int i;
01044 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01045 int c = s->channel_indexes_for_cur_subframe[i];
01046 float* window;
01047 int winlen = s->channel[c].prev_block_len;
01048 float* start = s->channel[c].coeffs - (winlen >> 1);
01049
01050 if (s->subframe_len < winlen) {
01051 start += (winlen - s->subframe_len) >> 1;
01052 winlen = s->subframe_len;
01053 }
01054
01055 window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
01056
01057 winlen >>= 1;
01058
01059 s->dsp.vector_fmul_window(start, start, start + winlen,
01060 window, winlen);
01061
01062 s->channel[c].prev_block_len = s->subframe_len;
01063 }
01064 }
01065
01071 static int decode_subframe(WMAProDecodeCtx *s)
01072 {
01073 int offset = s->samples_per_frame;
01074 int subframe_len = s->samples_per_frame;
01075 int i;
01076 int total_samples = s->samples_per_frame * s->avctx->channels;
01077 int transmit_coeffs = 0;
01078 int cur_subwoofer_cutoff;
01079
01080 s->subframe_offset = get_bits_count(&s->gb);
01081
01086 for (i = 0; i < s->avctx->channels; i++) {
01087 s->channel[i].grouped = 0;
01088 if (offset > s->channel[i].decoded_samples) {
01089 offset = s->channel[i].decoded_samples;
01090 subframe_len =
01091 s->channel[i].subframe_len[s->channel[i].cur_subframe];
01092 }
01093 }
01094
01095 av_dlog(s->avctx,
01096 "processing subframe with offset %i len %i\n", offset, subframe_len);
01097
01099 s->channels_for_cur_subframe = 0;
01100 for (i = 0; i < s->avctx->channels; i++) {
01101 const int cur_subframe = s->channel[i].cur_subframe;
01103 total_samples -= s->channel[i].decoded_samples;
01104
01106 if (offset == s->channel[i].decoded_samples &&
01107 subframe_len == s->channel[i].subframe_len[cur_subframe]) {
01108 total_samples -= s->channel[i].subframe_len[cur_subframe];
01109 s->channel[i].decoded_samples +=
01110 s->channel[i].subframe_len[cur_subframe];
01111 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
01112 ++s->channels_for_cur_subframe;
01113 }
01114 }
01115
01118 if (!total_samples)
01119 s->parsed_all_subframes = 1;
01120
01121
01122 av_dlog(s->avctx, "subframe is part of %i channels\n",
01123 s->channels_for_cur_subframe);
01124
01126 s->table_idx = av_log2(s->samples_per_frame/subframe_len);
01127 s->num_bands = s->num_sfb[s->table_idx];
01128 s->cur_sfb_offsets = s->sfb_offsets[s->table_idx];
01129 cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
01130
01132 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01133 int c = s->channel_indexes_for_cur_subframe[i];
01134
01135 s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1)
01136 + offset];
01137 }
01138
01139 s->subframe_len = subframe_len;
01140 s->esc_len = av_log2(s->subframe_len - 1) + 1;
01141
01143 if (get_bits1(&s->gb)) {
01144 int num_fill_bits;
01145 if (!(num_fill_bits = get_bits(&s->gb, 2))) {
01146 int len = get_bits(&s->gb, 4);
01147 num_fill_bits = (len ? get_bits(&s->gb, len) : 0) + 1;
01148 }
01149
01150 if (num_fill_bits >= 0) {
01151 if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
01152 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
01153 return AVERROR_INVALIDDATA;
01154 }
01155
01156 skip_bits_long(&s->gb, num_fill_bits);
01157 }
01158 }
01159
01161 if (get_bits1(&s->gb)) {
01162 av_log_ask_for_sample(s->avctx, "reserved bit set\n");
01163 return AVERROR_INVALIDDATA;
01164 }
01165
01166
01167 if (decode_channel_transform(s) < 0)
01168 return AVERROR_INVALIDDATA;
01169
01170
01171 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01172 int c = s->channel_indexes_for_cur_subframe[i];
01173 if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
01174 transmit_coeffs = 1;
01175 }
01176
01177 av_assert0(s->subframe_len <= WMAPRO_BLOCK_MAX_SIZE);
01178 if (transmit_coeffs) {
01179 int step;
01180 int quant_step = 90 * s->bits_per_sample >> 4;
01181
01183 if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
01184 int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
01185 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01186 int c = s->channel_indexes_for_cur_subframe[i];
01187 int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
01188 if (num_vec_coeffs > s->subframe_len) {
01189 av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
01190 return AVERROR_INVALIDDATA;
01191 }
01192 s->channel[c].num_vec_coeffs = num_vec_coeffs;
01193 }
01194 } else {
01195 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01196 int c = s->channel_indexes_for_cur_subframe[i];
01197 s->channel[c].num_vec_coeffs = s->subframe_len;
01198 }
01199 }
01201 step = get_sbits(&s->gb, 6);
01202 quant_step += step;
01203 if (step == -32 || step == 31) {
01204 const int sign = (step == 31) - 1;
01205 int quant = 0;
01206 while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
01207 (step = get_bits(&s->gb, 5)) == 31) {
01208 quant += 31;
01209 }
01210 quant_step += ((quant + step) ^ sign) - sign;
01211 }
01212 if (quant_step < 0) {
01213 av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
01214 }
01215
01218 if (s->channels_for_cur_subframe == 1) {
01219 s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
01220 } else {
01221 int modifier_len = get_bits(&s->gb, 3);
01222 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01223 int c = s->channel_indexes_for_cur_subframe[i];
01224 s->channel[c].quant_step = quant_step;
01225 if (get_bits1(&s->gb)) {
01226 if (modifier_len) {
01227 s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
01228 } else
01229 ++s->channel[c].quant_step;
01230 }
01231 }
01232 }
01233
01235 if (decode_scale_factors(s) < 0)
01236 return AVERROR_INVALIDDATA;
01237 }
01238
01239 av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
01240 get_bits_count(&s->gb) - s->subframe_offset);
01241
01243 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01244 int c = s->channel_indexes_for_cur_subframe[i];
01245 if (s->channel[c].transmit_coefs &&
01246 get_bits_count(&s->gb) < s->num_saved_bits) {
01247 decode_coeffs(s, c);
01248 } else
01249 memset(s->channel[c].coeffs, 0,
01250 sizeof(*s->channel[c].coeffs) * subframe_len);
01251 }
01252
01253 av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
01254 get_bits_count(&s->gb) - s->subframe_offset);
01255
01256 if (transmit_coeffs) {
01257 FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
01259 inverse_channel_transform(s);
01260 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01261 int c = s->channel_indexes_for_cur_subframe[i];
01262 const int* sf = s->channel[c].scale_factors;
01263 int b;
01264
01265 if (c == s->lfe_channel)
01266 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
01267 (subframe_len - cur_subwoofer_cutoff));
01268
01270 for (b = 0; b < s->num_bands; b++) {
01271 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
01272 const int exp = s->channel[c].quant_step -
01273 (s->channel[c].max_scale_factor - *sf++) *
01274 s->channel[c].scale_factor_step;
01275 const float quant = pow(10.0, exp / 20.0);
01276 int start = s->cur_sfb_offsets[b];
01277 s->fdsp.vector_fmul_scalar(s->tmp + start,
01278 s->channel[c].coeffs + start,
01279 quant, end - start);
01280 }
01281
01283 mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
01284 }
01285 }
01286
01288 wmapro_window(s);
01289
01291 for (i = 0; i < s->channels_for_cur_subframe; i++) {
01292 int c = s->channel_indexes_for_cur_subframe[i];
01293 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
01294 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
01295 return AVERROR_INVALIDDATA;
01296 }
01297 ++s->channel[c].cur_subframe;
01298 }
01299
01300 return 0;
01301 }
01302
01309 static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
01310 {
01311 AVCodecContext *avctx = s->avctx;
01312 GetBitContext* gb = &s->gb;
01313 int more_frames = 0;
01314 int len = 0;
01315 int i, ret;
01316
01318 if (s->len_prefix)
01319 len = get_bits(gb, s->log2_frame_size);
01320
01321 av_dlog(s->avctx, "decoding frame with length %x\n", len);
01322
01324 if (decode_tilehdr(s)) {
01325 s->packet_loss = 1;
01326 return 0;
01327 }
01328
01330 if (s->avctx->channels > 1 && get_bits1(gb)) {
01331 if (get_bits1(gb)) {
01332 for (i = 0; i < avctx->channels * avctx->channels; i++)
01333 skip_bits(gb, 4);
01334 }
01335 }
01336
01338 if (s->dynamic_range_compression) {
01339 s->drc_gain = get_bits(gb, 8);
01340 av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
01341 }
01342
01345 if (get_bits1(gb)) {
01346 int av_unused skip;
01347
01349 if (get_bits1(gb)) {
01350 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01351 av_dlog(s->avctx, "start skip: %i\n", skip);
01352 }
01353
01355 if (get_bits1(gb)) {
01356 skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01357 av_dlog(s->avctx, "end skip: %i\n", skip);
01358 }
01359
01360 }
01361
01362 av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
01363 get_bits_count(gb) - s->frame_offset);
01364
01366 s->parsed_all_subframes = 0;
01367 for (i = 0; i < avctx->channels; i++) {
01368 s->channel[i].decoded_samples = 0;
01369 s->channel[i].cur_subframe = 0;
01370 s->channel[i].reuse_sf = 0;
01371 }
01372
01374 while (!s->parsed_all_subframes) {
01375 if (decode_subframe(s) < 0) {
01376 s->packet_loss = 1;
01377 return 0;
01378 }
01379 }
01380
01381
01382 s->frame.nb_samples = s->samples_per_frame;
01383 if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
01384 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
01385 s->packet_loss = 1;
01386 return 0;
01387 }
01388
01390 for (i = 0; i < avctx->channels; i++)
01391 memcpy(s->frame.extended_data[i], s->channel[i].out,
01392 s->samples_per_frame * sizeof(*s->channel[i].out));
01393
01394 for (i = 0; i < avctx->channels; i++) {
01396 memcpy(&s->channel[i].out[0],
01397 &s->channel[i].out[s->samples_per_frame],
01398 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
01399 }
01400
01401 if (s->skip_frame) {
01402 s->skip_frame = 0;
01403 *got_frame_ptr = 0;
01404 } else {
01405 *got_frame_ptr = 1;
01406 }
01407
01408 if (s->len_prefix) {
01409 if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
01411 av_log(s->avctx, AV_LOG_ERROR,
01412 "frame[%i] would have to skip %i bits\n", s->frame_num,
01413 len - (get_bits_count(gb) - s->frame_offset) - 1);
01414 s->packet_loss = 1;
01415 return 0;
01416 }
01417
01419 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
01420 } else {
01421 while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
01422 }
01423 }
01424
01426 more_frames = get_bits1(gb);
01427
01428 ++s->frame_num;
01429 return more_frames;
01430 }
01431
01438 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
01439 {
01440 return s->buf_bit_size - get_bits_count(gb);
01441 }
01442
01450 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
01451 int append)
01452 {
01453 int buflen;
01454
01459 if (!append) {
01460 s->frame_offset = get_bits_count(gb) & 7;
01461 s->num_saved_bits = s->frame_offset;
01462 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
01463 }
01464
01465 buflen = (put_bits_count(&s->pb) + len + 8) >> 3;
01466
01467 if (len <= 0 || buflen > MAX_FRAMESIZE) {
01468 av_log_ask_for_sample(s->avctx, "input buffer too small\n");
01469 s->packet_loss = 1;
01470 return;
01471 }
01472
01473 s->num_saved_bits += len;
01474 if (!append) {
01475 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
01476 s->num_saved_bits);
01477 } else {
01478 int align = 8 - (get_bits_count(gb) & 7);
01479 align = FFMIN(align, len);
01480 put_bits(&s->pb, align, get_bits(gb, align));
01481 len -= align;
01482 avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
01483 }
01484 skip_bits_long(gb, len);
01485
01486 {
01487 PutBitContext tmp = s->pb;
01488 flush_put_bits(&tmp);
01489 }
01490
01491 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
01492 skip_bits(&s->gb, s->frame_offset);
01493 }
01494
01502 static int decode_packet(AVCodecContext *avctx, void *data,
01503 int *got_frame_ptr, AVPacket* avpkt)
01504 {
01505 WMAProDecodeCtx *s = avctx->priv_data;
01506 GetBitContext* gb = &s->pgb;
01507 const uint8_t* buf = avpkt->data;
01508 int buf_size = avpkt->size;
01509 int num_bits_prev_frame;
01510 int packet_sequence_number;
01511
01512 *got_frame_ptr = 0;
01513
01514 if (s->packet_done || s->packet_loss) {
01515 s->packet_done = 0;
01516
01518 if (buf_size < avctx->block_align)
01519 return 0;
01520
01521 s->next_packet_start = buf_size - avctx->block_align;
01522 buf_size = avctx->block_align;
01523 s->buf_bit_size = buf_size << 3;
01524
01526 init_get_bits(gb, buf, s->buf_bit_size);
01527 packet_sequence_number = get_bits(gb, 4);
01528 skip_bits(gb, 2);
01529
01531 num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
01532 av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
01533 num_bits_prev_frame);
01534
01536 if (!s->packet_loss &&
01537 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
01538 s->packet_loss = 1;
01539 av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
01540 s->packet_sequence_number, packet_sequence_number);
01541 }
01542 s->packet_sequence_number = packet_sequence_number;
01543
01544 if (num_bits_prev_frame > 0) {
01545 int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
01546 if (num_bits_prev_frame >= remaining_packet_bits) {
01547 num_bits_prev_frame = remaining_packet_bits;
01548 s->packet_done = 1;
01549 }
01550
01553 save_bits(s, gb, num_bits_prev_frame, 1);
01554 av_dlog(avctx, "accumulated %x bits of frame data\n",
01555 s->num_saved_bits - s->frame_offset);
01556
01558 if (!s->packet_loss)
01559 decode_frame(s, got_frame_ptr);
01560 } else if (s->num_saved_bits - s->frame_offset) {
01561 av_dlog(avctx, "ignoring %x previously saved bits\n",
01562 s->num_saved_bits - s->frame_offset);
01563 }
01564
01565 if (s->packet_loss) {
01569 s->num_saved_bits = 0;
01570 s->packet_loss = 0;
01571 }
01572
01573 } else {
01574 int frame_size;
01575 s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
01576 init_get_bits(gb, avpkt->data, s->buf_bit_size);
01577 skip_bits(gb, s->packet_offset);
01578 if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
01579 (frame_size = show_bits(gb, s->log2_frame_size)) &&
01580 frame_size <= remaining_bits(s, gb)) {
01581 save_bits(s, gb, frame_size, 0);
01582 s->packet_done = !decode_frame(s, got_frame_ptr);
01583 } else if (!s->len_prefix
01584 && s->num_saved_bits > get_bits_count(&s->gb)) {
01592 s->packet_done = !decode_frame(s, got_frame_ptr);
01593 } else
01594 s->packet_done = 1;
01595 }
01596
01597 if (s->packet_done && !s->packet_loss &&
01598 remaining_bits(s, gb) > 0) {
01601 save_bits(s, gb, remaining_bits(s, gb), 0);
01602 }
01603
01604 s->packet_offset = get_bits_count(gb) & 7;
01605 if (s->packet_loss)
01606 return AVERROR_INVALIDDATA;
01607
01608 if (*got_frame_ptr)
01609 *(AVFrame *)data = s->frame;
01610
01611 return get_bits_count(gb) >> 3;
01612 }
01613
01618 static void flush(AVCodecContext *avctx)
01619 {
01620 WMAProDecodeCtx *s = avctx->priv_data;
01621 int i;
01624 for (i = 0; i < avctx->channels; i++)
01625 memset(s->channel[i].out, 0, s->samples_per_frame *
01626 sizeof(*s->channel[i].out));
01627 s->packet_loss = 1;
01628 }
01629
01630
01634 AVCodec ff_wmapro_decoder = {
01635 .name = "wmapro",
01636 .type = AVMEDIA_TYPE_AUDIO,
01637 .id = AV_CODEC_ID_WMAPRO,
01638 .priv_data_size = sizeof(WMAProDecodeCtx),
01639 .init = decode_init,
01640 .close = decode_end,
01641 .decode = decode_packet,
01642 .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
01643 .flush = flush,
01644 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
01645 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
01646 AV_SAMPLE_FMT_NONE },
01647 };