libavcodec/wmaprodec.c
Go to the documentation of this file.
00001 /*
00002  * Wmapro compatible decoder
00003  * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
00004  * Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * Libav is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with Libav; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00089 #include "libavutil/intfloat.h"
00090 #include "libavutil/intreadwrite.h"
00091 #include "avcodec.h"
00092 #include "internal.h"
00093 #include "get_bits.h"
00094 #include "put_bits.h"
00095 #include "wmaprodata.h"
00096 #include "dsputil.h"
00097 #include "fmtconvert.h"
00098 #include "sinewin.h"
00099 #include "wma.h"
00100 
00102 #define WMAPRO_MAX_CHANNELS    8                             ///< max number of handled channels
00103 #define MAX_SUBFRAMES  32                                    ///< max number of subframes per channel
00104 #define MAX_BANDS      29                                    ///< max number of scale factor bands
00105 #define MAX_FRAMESIZE  32768                                 ///< maximum compressed frame size
00106 
00107 #define WMAPRO_BLOCK_MIN_BITS  6                                           ///< log2 of min block size
00108 #define WMAPRO_BLOCK_MAX_BITS 12                                           ///< log2 of max block size
00109 #define WMAPRO_BLOCK_MIN_SIZE (1 << WMAPRO_BLOCK_MIN_BITS)                 ///< minimum block size
00110 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS)                 ///< maximum block size
00111 #define WMAPRO_BLOCK_SIZES    (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes
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     /* generic decoder variables */
00171     AVCodecContext*  avctx;                         
00172     AVFrame          frame;                         
00173     DSPContext       dsp;                           
00174     FmtConvertContext fmt_conv;
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     /* frame size dependent frame information (set during initialization) */
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           num_channels;                  
00190     int8_t           lfe_channel;                   
00191     uint8_t          max_num_subframes;
00192     uint8_t          subframe_len_bits;             
00193     uint8_t          max_subframe_len_bit;          
00194     uint16_t         min_samples_per_subframe;
00195     int8_t           num_sfb[WMAPRO_BLOCK_SIZES];   
00196     int16_t          sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS];                    
00197     int8_t           sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]; 
00198     int16_t          subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; 
00199 
00200     /* packet decode state */
00201     GetBitContext    pgb;                           
00202     int              next_packet_start;             
00203     uint8_t          packet_offset;                 
00204     uint8_t          packet_sequence_number;        
00205     int              num_saved_bits;                
00206     int              frame_offset;                  
00207     int              subframe_offset;               
00208     uint8_t          packet_loss;                   
00209     uint8_t          packet_done;                   
00210 
00211     /* frame decode state */
00212     uint32_t         frame_num;                     
00213     GetBitContext    gb;                            
00214     int              buf_bit_size;                  
00215     uint8_t          drc_gain;                      
00216     int8_t           skip_frame;                    
00217     int8_t           parsed_all_subframes;          
00218 
00219     /* subframe/block decode state */
00220     int16_t          subframe_len;                  
00221     int8_t           channels_for_cur_subframe;     
00222     int8_t           channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS];
00223     int8_t           num_bands;                     
00224     int8_t           transmit_num_vec_coeffs;       
00225     int16_t*         cur_sfb_offsets;               
00226     uint8_t          table_idx;                     
00227     int8_t           esc_len;                       
00228 
00229     uint8_t          num_chgroups;                  
00230     WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS];  
00231 
00232     WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS];  
00233 } WMAProDecodeCtx;
00234 
00235 
00240 static void av_cold dump_context(WMAProDecodeCtx *s)
00241 {
00242 #define PRINT(a, b)     av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
00243 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b);
00244 
00245     PRINT("ed sample bit depth", s->bits_per_sample);
00246     PRINT_HEX("ed decode flags", s->decode_flags);
00247     PRINT("samples per frame",   s->samples_per_frame);
00248     PRINT("log2 frame size",     s->log2_frame_size);
00249     PRINT("max num subframes",   s->max_num_subframes);
00250     PRINT("len prefix",          s->len_prefix);
00251     PRINT("num channels",        s->num_channels);
00252 }
00253 
00259 static av_cold int decode_end(AVCodecContext *avctx)
00260 {
00261     WMAProDecodeCtx *s = avctx->priv_data;
00262     int i;
00263 
00264     for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00265         ff_mdct_end(&s->mdct_ctx[i]);
00266 
00267     return 0;
00268 }
00269 
00275 static av_cold int decode_init(AVCodecContext *avctx)
00276 {
00277     WMAProDecodeCtx *s = avctx->priv_data;
00278     uint8_t *edata_ptr = avctx->extradata;
00279     unsigned int channel_mask;
00280     int i;
00281     int log2_max_num_subframes;
00282     int num_possible_block_sizes;
00283 
00284     if (!avctx->block_align) {
00285         av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
00286         return AVERROR(EINVAL);
00287     }
00288 
00289     s->avctx = avctx;
00290     dsputil_init(&s->dsp, avctx);
00291     ff_fmt_convert_init(&s->fmt_conv, avctx);
00292     init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
00293 
00294     avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
00295 
00296     if (avctx->extradata_size >= 18) {
00297         s->decode_flags    = AV_RL16(edata_ptr+14);
00298         channel_mask       = AV_RL32(edata_ptr+2);
00299         s->bits_per_sample = AV_RL16(edata_ptr);
00301         for (i = 0; i < avctx->extradata_size; i++)
00302             av_dlog(avctx, "[%x] ", avctx->extradata[i]);
00303         av_dlog(avctx, "\n");
00304 
00305     } else {
00306         av_log_ask_for_sample(avctx, "Unknown extradata size\n");
00307         return AVERROR_INVALIDDATA;
00308     }
00309 
00311     s->log2_frame_size = av_log2(avctx->block_align) + 4;
00312 
00314     s->skip_frame  = 1; /* skip first frame */
00315     s->packet_loss = 1;
00316     s->len_prefix  = (s->decode_flags & 0x40);
00317 
00319     s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
00320                                                           3, s->decode_flags);
00321 
00323     log2_max_num_subframes       = ((s->decode_flags & 0x38) >> 3);
00324     s->max_num_subframes         = 1 << log2_max_num_subframes;
00325     if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
00326         s->max_subframe_len_bit = 1;
00327     s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
00328 
00329     num_possible_block_sizes     = log2_max_num_subframes + 1;
00330     s->min_samples_per_subframe  = s->samples_per_frame / s->max_num_subframes;
00331     s->dynamic_range_compression = (s->decode_flags & 0x80);
00332 
00333     if (s->max_num_subframes > MAX_SUBFRAMES) {
00334         av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n",
00335                s->max_num_subframes);
00336         return AVERROR_INVALIDDATA;
00337     }
00338 
00339     if (s->min_samples_per_subframe < WMAPRO_BLOCK_MIN_SIZE) {
00340         av_log(avctx, AV_LOG_ERROR, "Invalid minimum block size %i\n",
00341                s->max_num_subframes);
00342         return AVERROR_INVALIDDATA;
00343     }
00344 
00345     if (s->avctx->sample_rate <= 0) {
00346         av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
00347         return AVERROR_INVALIDDATA;
00348     }
00349 
00350     s->num_channels = avctx->channels;
00351 
00352     if (s->num_channels < 0) {
00353         av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", s->num_channels);
00354         return AVERROR_INVALIDDATA;
00355     } else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
00356         av_log_ask_for_sample(avctx, "unsupported number of channels\n");
00357         return AVERROR_PATCHWELCOME;
00358     }
00359 
00361     for (i = 0; i < s->num_channels; i++)
00362         s->channel[i].prev_block_len = s->samples_per_frame;
00363 
00365     s->lfe_channel = -1;
00366 
00367     if (channel_mask & 8) {
00368         unsigned int mask;
00369         for (mask = 1; mask < 16; mask <<= 1) {
00370             if (channel_mask & mask)
00371                 ++s->lfe_channel;
00372         }
00373     }
00374 
00375     INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
00376                     scale_huffbits, 1, 1,
00377                     scale_huffcodes, 2, 2, 616);
00378 
00379     INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
00380                     scale_rl_huffbits, 1, 1,
00381                     scale_rl_huffcodes, 4, 4, 1406);
00382 
00383     INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
00384                     coef0_huffbits, 1, 1,
00385                     coef0_huffcodes, 4, 4, 2108);
00386 
00387     INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
00388                     coef1_huffbits, 1, 1,
00389                     coef1_huffcodes, 4, 4, 3912);
00390 
00391     INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
00392                     vec4_huffbits, 1, 1,
00393                     vec4_huffcodes, 2, 2, 604);
00394 
00395     INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
00396                     vec2_huffbits, 1, 1,
00397                     vec2_huffcodes, 2, 2, 562);
00398 
00399     INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
00400                     vec1_huffbits, 1, 1,
00401                     vec1_huffcodes, 2, 2, 562);
00402 
00405     for (i = 0; i < num_possible_block_sizes; i++) {
00406         int subframe_len = s->samples_per_frame >> i;
00407         int x;
00408         int band = 1;
00409 
00410         s->sfb_offsets[i][0] = 0;
00411 
00412         for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
00413             int offset = (subframe_len * 2 * critical_freq[x])
00414                           / s->avctx->sample_rate + 2;
00415             offset &= ~3;
00416             if (offset > s->sfb_offsets[i][band - 1])
00417                 s->sfb_offsets[i][band++] = offset;
00418         }
00419         s->sfb_offsets[i][band - 1] = subframe_len;
00420         s->num_sfb[i]               = band - 1;
00421     }
00422 
00423 
00429     for (i = 0; i < num_possible_block_sizes; i++) {
00430         int b;
00431         for (b = 0; b < s->num_sfb[i]; b++) {
00432             int x;
00433             int offset = ((s->sfb_offsets[i][b]
00434                            + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
00435             for (x = 0; x < num_possible_block_sizes; x++) {
00436                 int v = 0;
00437                 while (s->sfb_offsets[x][v + 1] << x < offset)
00438                     if (++v >= MAX_BANDS)
00439                         return AVERROR_INVALIDDATA;
00440                 s->sf_offsets[i][x][b] = v;
00441             }
00442         }
00443     }
00444 
00446     for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
00447         ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1,
00448                      1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
00449                      / (1 << (s->bits_per_sample - 1)));
00450 
00452     for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
00453         const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
00454         ff_init_ff_sine_windows(win_idx);
00455         s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
00456     }
00457 
00459     for (i = 0; i < num_possible_block_sizes; i++) {
00460         int block_size = s->samples_per_frame >> i;
00461         int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1)
00462                      / s->avctx->sample_rate;
00463         s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
00464     }
00465 
00467     for (i = 0; i < 33; i++)
00468         sin64[i] = sin(i*M_PI / 64.0);
00469 
00470     if (avctx->debug & FF_DEBUG_BITSTREAM)
00471         dump_context(s);
00472 
00473     avctx->channel_layout = channel_mask;
00474 
00475     avcodec_get_frame_defaults(&s->frame);
00476     avctx->coded_frame = &s->frame;
00477 
00478     return 0;
00479 }
00480 
00487 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
00488 {
00489     int frame_len_shift = 0;
00490     int subframe_len;
00491 
00493     if (offset == s->samples_per_frame - s->min_samples_per_subframe)
00494         return s->min_samples_per_subframe;
00495 
00497     if (s->max_subframe_len_bit) {
00498         if (get_bits1(&s->gb))
00499             frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
00500     } else
00501         frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
00502 
00503     subframe_len = s->samples_per_frame >> frame_len_shift;
00504 
00506     if (subframe_len < s->min_samples_per_subframe ||
00507         subframe_len > s->samples_per_frame) {
00508         av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
00509                subframe_len);
00510         return AVERROR_INVALIDDATA;
00511     }
00512     return subframe_len;
00513 }
00514 
00535 static int decode_tilehdr(WMAProDecodeCtx *s)
00536 {
00537     uint16_t num_samples[WMAPRO_MAX_CHANNELS];        
00538     uint8_t  contains_subframe[WMAPRO_MAX_CHANNELS];  
00539     int channels_for_cur_subframe = s->num_channels;  
00540     int fixed_channel_layout = 0;                     
00541     int min_channel_len = 0;                          
00542     int c;
00543 
00544     /* Should never consume more than 3073 bits (256 iterations for the
00545      * while loop when always the minimum amount of 128 samples is substracted
00546      * from missing samples in the 8 channel case).
00547      * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS  + 4)
00548      */
00549 
00551     for (c = 0; c < s->num_channels; c++)
00552         s->channel[c].num_subframes = 0;
00553 
00554     memset(num_samples, 0, sizeof(num_samples));
00555 
00556     if (s->max_num_subframes == 1 || get_bits1(&s->gb))
00557         fixed_channel_layout = 1;
00558 
00560     do {
00561         int subframe_len;
00562 
00564         for (c = 0; c < s->num_channels; c++) {
00565             if (num_samples[c] == min_channel_len) {
00566                 if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
00567                    (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
00568                     contains_subframe[c] = 1;
00569                 else
00570                     contains_subframe[c] = get_bits1(&s->gb);
00571             } else
00572                 contains_subframe[c] = 0;
00573         }
00574 
00576         if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
00577             return AVERROR_INVALIDDATA;
00578 
00580         min_channel_len += subframe_len;
00581         for (c = 0; c < s->num_channels; c++) {
00582             WMAProChannelCtx* chan = &s->channel[c];
00583 
00584             if (contains_subframe[c]) {
00585                 if (chan->num_subframes >= MAX_SUBFRAMES) {
00586                     av_log(s->avctx, AV_LOG_ERROR,
00587                            "broken frame: num subframes > 31\n");
00588                     return AVERROR_INVALIDDATA;
00589                 }
00590                 chan->subframe_len[chan->num_subframes] = subframe_len;
00591                 num_samples[c] += subframe_len;
00592                 ++chan->num_subframes;
00593                 if (num_samples[c] > s->samples_per_frame) {
00594                     av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
00595                            "channel len > samples_per_frame\n");
00596                     return AVERROR_INVALIDDATA;
00597                 }
00598             } else if (num_samples[c] <= min_channel_len) {
00599                 if (num_samples[c] < min_channel_len) {
00600                     channels_for_cur_subframe = 0;
00601                     min_channel_len = num_samples[c];
00602                 }
00603                 ++channels_for_cur_subframe;
00604             }
00605         }
00606     } while (min_channel_len < s->samples_per_frame);
00607 
00608     for (c = 0; c < s->num_channels; c++) {
00609         int i;
00610         int offset = 0;
00611         for (i = 0; i < s->channel[c].num_subframes; i++) {
00612             av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]"
00613                     " len %i\n", s->frame_num, c, i,
00614                     s->channel[c].subframe_len[i]);
00615             s->channel[c].subframe_offset[i] = offset;
00616             offset += s->channel[c].subframe_len[i];
00617         }
00618     }
00619 
00620     return 0;
00621 }
00622 
00628 static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
00629                                         WMAProChannelGrp *chgroup)
00630 {
00631     int i;
00632     int offset = 0;
00633     int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
00634     memset(chgroup->decorrelation_matrix, 0, s->num_channels *
00635            s->num_channels * sizeof(*chgroup->decorrelation_matrix));
00636 
00637     for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
00638         rotation_offset[i] = get_bits(&s->gb, 6);
00639 
00640     for (i = 0; i < chgroup->num_channels; i++)
00641         chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
00642             get_bits1(&s->gb) ? 1.0 : -1.0;
00643 
00644     for (i = 1; i < chgroup->num_channels; i++) {
00645         int x;
00646         for (x = 0; x < i; x++) {
00647             int y;
00648             for (y = 0; y < i + 1; y++) {
00649                 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
00650                 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
00651                 int n = rotation_offset[offset + x];
00652                 float sinv;
00653                 float cosv;
00654 
00655                 if (n < 32) {
00656                     sinv = sin64[n];
00657                     cosv = sin64[32 - n];
00658                 } else {
00659                     sinv =  sin64[64 -  n];
00660                     cosv = -sin64[n  - 32];
00661                 }
00662 
00663                 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
00664                                                (v1 * sinv) - (v2 * cosv);
00665                 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
00666                                                (v1 * cosv) + (v2 * sinv);
00667             }
00668         }
00669         offset += i;
00670     }
00671 }
00672 
00678 static int decode_channel_transform(WMAProDecodeCtx* s)
00679 {
00680     int i;
00681     /* should never consume more than 1921 bits for the 8 channel case
00682      * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS
00683      * + MAX_CHANNELS + MAX_BANDS + 1)
00684      */
00685 
00687     s->num_chgroups = 0;
00688     if (s->num_channels > 1) {
00689         int remaining_channels = s->channels_for_cur_subframe;
00690 
00691         if (get_bits1(&s->gb)) {
00692             av_log_ask_for_sample(s->avctx,
00693                                   "unsupported channel transform bit\n");
00694             return AVERROR_INVALIDDATA;
00695         }
00696 
00697         for (s->num_chgroups = 0; remaining_channels &&
00698              s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
00699             WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
00700             float** channel_data = chgroup->channel_data;
00701             chgroup->num_channels = 0;
00702             chgroup->transform = 0;
00703 
00705             if (remaining_channels > 2) {
00706                 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00707                     int channel_idx = s->channel_indexes_for_cur_subframe[i];
00708                     if (!s->channel[channel_idx].grouped
00709                         && get_bits1(&s->gb)) {
00710                         ++chgroup->num_channels;
00711                         s->channel[channel_idx].grouped = 1;
00712                         *channel_data++ = s->channel[channel_idx].coeffs;
00713                     }
00714                 }
00715             } else {
00716                 chgroup->num_channels = remaining_channels;
00717                 for (i = 0; i < s->channels_for_cur_subframe; i++) {
00718                     int channel_idx = s->channel_indexes_for_cur_subframe[i];
00719                     if (!s->channel[channel_idx].grouped)
00720                         *channel_data++ = s->channel[channel_idx].coeffs;
00721                     s->channel[channel_idx].grouped = 1;
00722                 }
00723             }
00724 
00726             if (chgroup->num_channels == 2) {
00727                 if (get_bits1(&s->gb)) {
00728                     if (get_bits1(&s->gb)) {
00729                         av_log_ask_for_sample(s->avctx,
00730                                               "unsupported channel transform type\n");
00731                         return AVERROR_PATCHWELCOME;
00732                     }
00733                 } else {
00734                     chgroup->transform = 1;
00735                     if (s->num_channels == 2) {
00736                         chgroup->decorrelation_matrix[0] =  1.0;
00737                         chgroup->decorrelation_matrix[1] = -1.0;
00738                         chgroup->decorrelation_matrix[2] =  1.0;
00739                         chgroup->decorrelation_matrix[3] =  1.0;
00740                     } else {
00742                         chgroup->decorrelation_matrix[0] =  0.70703125;
00743                         chgroup->decorrelation_matrix[1] = -0.70703125;
00744                         chgroup->decorrelation_matrix[2] =  0.70703125;
00745                         chgroup->decorrelation_matrix[3] =  0.70703125;
00746                     }
00747                 }
00748             } else if (chgroup->num_channels > 2) {
00749                 if (get_bits1(&s->gb)) {
00750                     chgroup->transform = 1;
00751                     if (get_bits1(&s->gb)) {
00752                         decode_decorrelation_matrix(s, chgroup);
00753                     } else {
00755                         if (chgroup->num_channels > 6) {
00756                             av_log_ask_for_sample(s->avctx,
00757                                                   "coupled channels > 6\n");
00758                         } else {
00759                             memcpy(chgroup->decorrelation_matrix,
00760                                    default_decorrelation[chgroup->num_channels],
00761                                    chgroup->num_channels * chgroup->num_channels *
00762                                    sizeof(*chgroup->decorrelation_matrix));
00763                         }
00764                     }
00765                 }
00766             }
00767 
00769             if (chgroup->transform) {
00770                 if (!get_bits1(&s->gb)) {
00771                     int i;
00773                     for (i = 0; i < s->num_bands; i++) {
00774                         chgroup->transform_band[i] = get_bits1(&s->gb);
00775                     }
00776                 } else {
00777                     memset(chgroup->transform_band, 1, s->num_bands);
00778                 }
00779             }
00780             remaining_channels -= chgroup->num_channels;
00781         }
00782     }
00783     return 0;
00784 }
00785 
00792 static int decode_coeffs(WMAProDecodeCtx *s, int c)
00793 {
00794     /* Integers 0..15 as single-precision floats.  The table saves a
00795        costly int to float conversion, and storing the values as
00796        integers allows fast sign-flipping. */
00797     static const uint32_t fval_tab[16] = {
00798         0x00000000, 0x3f800000, 0x40000000, 0x40400000,
00799         0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
00800         0x41000000, 0x41100000, 0x41200000, 0x41300000,
00801         0x41400000, 0x41500000, 0x41600000, 0x41700000,
00802     };
00803     int vlctable;
00804     VLC* vlc;
00805     WMAProChannelCtx* ci = &s->channel[c];
00806     int rl_mode = 0;
00807     int cur_coeff = 0;
00808     int num_zeros = 0;
00809     const uint16_t* run;
00810     const float* level;
00811 
00812     av_dlog(s->avctx, "decode coefficients for channel %i\n", c);
00813 
00814     vlctable = get_bits1(&s->gb);
00815     vlc = &coef_vlc[vlctable];
00816 
00817     if (vlctable) {
00818         run = coef1_run;
00819         level = coef1_level;
00820     } else {
00821         run = coef0_run;
00822         level = coef0_level;
00823     }
00824 
00827     while ((s->transmit_num_vec_coeffs || !rl_mode) &&
00828            (cur_coeff + 3 < ci->num_vec_coeffs)) {
00829         uint32_t vals[4];
00830         int i;
00831         unsigned int idx;
00832 
00833         idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
00834 
00835         if (idx == HUFF_VEC4_SIZE - 1) {
00836             for (i = 0; i < 4; i += 2) {
00837                 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
00838                 if (idx == HUFF_VEC2_SIZE - 1) {
00839                     uint32_t v0, v1;
00840                     v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00841                     if (v0 == HUFF_VEC1_SIZE - 1)
00842                         v0 += ff_wma_get_large_val(&s->gb);
00843                     v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
00844                     if (v1 == HUFF_VEC1_SIZE - 1)
00845                         v1 += ff_wma_get_large_val(&s->gb);
00846                     vals[i  ] = av_float2int(v0);
00847                     vals[i+1] = av_float2int(v1);
00848                 } else {
00849                     vals[i]   = fval_tab[symbol_to_vec2[idx] >> 4 ];
00850                     vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF];
00851                 }
00852             }
00853         } else {
00854             vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12      ];
00855             vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF];
00856             vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF];
00857             vals[3] = fval_tab[ symbol_to_vec4[idx]       & 0xF];
00858         }
00859 
00861         for (i = 0; i < 4; i++) {
00862             if (vals[i]) {
00863                 uint32_t sign = get_bits1(&s->gb) - 1;
00864                 AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
00865                 num_zeros = 0;
00866             } else {
00867                 ci->coeffs[cur_coeff] = 0;
00870                 rl_mode |= (++num_zeros > s->subframe_len >> 8);
00871             }
00872             ++cur_coeff;
00873         }
00874     }
00875 
00877     if (cur_coeff < s->subframe_len) {
00878         memset(&ci->coeffs[cur_coeff], 0,
00879                sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
00880         if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
00881                                     level, run, 1, ci->coeffs,
00882                                     cur_coeff, s->subframe_len,
00883                                     s->subframe_len, s->esc_len, 0))
00884             return AVERROR_INVALIDDATA;
00885     }
00886 
00887     return 0;
00888 }
00889 
00895 static int decode_scale_factors(WMAProDecodeCtx* s)
00896 {
00897     int i;
00898 
00903     for (i = 0; i < s->channels_for_cur_subframe; i++) {
00904         int c = s->channel_indexes_for_cur_subframe[i];
00905         int* sf;
00906         int* sf_end;
00907         s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
00908         sf_end = s->channel[c].scale_factors + s->num_bands;
00909 
00915         if (s->channel[c].reuse_sf) {
00916             const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
00917             int b;
00918             for (b = 0; b < s->num_bands; b++)
00919                 s->channel[c].scale_factors[b] =
00920                     s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
00921         }
00922 
00923         if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
00924 
00925             if (!s->channel[c].reuse_sf) {
00926                 int val;
00928                 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
00929                 val = 45 / s->channel[c].scale_factor_step;
00930                 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
00931                     val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60;
00932                     *sf = val;
00933                 }
00934             } else {
00935                 int i;
00937                 for (i = 0; i < s->num_bands; i++) {
00938                     int idx;
00939                     int skip;
00940                     int val;
00941                     int sign;
00942 
00943                     idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
00944 
00945                     if (!idx) {
00946                         uint32_t code = get_bits(&s->gb, 14);
00947                         val  =  code >> 6;
00948                         sign = (code & 1) - 1;
00949                         skip = (code & 0x3f) >> 1;
00950                     } else if (idx == 1) {
00951                         break;
00952                     } else {
00953                         skip = scale_rl_run[idx];
00954                         val  = scale_rl_level[idx];
00955                         sign = get_bits1(&s->gb)-1;
00956                     }
00957 
00958                     i += skip;
00959                     if (i >= s->num_bands) {
00960                         av_log(s->avctx, AV_LOG_ERROR,
00961                                "invalid scale factor coding\n");
00962                         return AVERROR_INVALIDDATA;
00963                     }
00964                     s->channel[c].scale_factors[i] += (val ^ sign) - sign;
00965                 }
00966             }
00968             s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
00969             s->channel[c].table_idx = s->table_idx;
00970             s->channel[c].reuse_sf  = 1;
00971         }
00972 
00974         s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
00975         for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
00976             s->channel[c].max_scale_factor =
00977                 FFMAX(s->channel[c].max_scale_factor, *sf);
00978         }
00979 
00980     }
00981     return 0;
00982 }
00983 
00988 static void inverse_channel_transform(WMAProDecodeCtx *s)
00989 {
00990     int i;
00991 
00992     for (i = 0; i < s->num_chgroups; i++) {
00993         if (s->chgroup[i].transform) {
00994             float data[WMAPRO_MAX_CHANNELS];
00995             const int num_channels = s->chgroup[i].num_channels;
00996             float** ch_data = s->chgroup[i].channel_data;
00997             float** ch_end = ch_data + num_channels;
00998             const int8_t* tb = s->chgroup[i].transform_band;
00999             int16_t* sfb;
01000 
01002             for (sfb = s->cur_sfb_offsets;
01003                  sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
01004                 int y;
01005                 if (*tb++ == 1) {
01007                     for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
01008                         const float* mat = s->chgroup[i].decorrelation_matrix;
01009                         const float* data_end = data + num_channels;
01010                         float* data_ptr = data;
01011                         float** ch;
01012 
01013                         for (ch = ch_data; ch < ch_end; ch++)
01014                             *data_ptr++ = (*ch)[y];
01015 
01016                         for (ch = ch_data; ch < ch_end; ch++) {
01017                             float sum = 0;
01018                             data_ptr = data;
01019                             while (data_ptr < data_end)
01020                                 sum += *data_ptr++ * *mat++;
01021 
01022                             (*ch)[y] = sum;
01023                         }
01024                     }
01025                 } else if (s->num_channels == 2) {
01026                     int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
01027                     s->dsp.vector_fmul_scalar(ch_data[0] + sfb[0],
01028                                               ch_data[0] + sfb[0],
01029                                               181.0 / 128, len);
01030                     s->dsp.vector_fmul_scalar(ch_data[1] + sfb[0],
01031                                               ch_data[1] + sfb[0],
01032                                               181.0 / 128, len);
01033                 }
01034             }
01035         }
01036     }
01037 }
01038 
01043 static void wmapro_window(WMAProDecodeCtx *s)
01044 {
01045     int i;
01046     for (i = 0; i < s->channels_for_cur_subframe; i++) {
01047         int c = s->channel_indexes_for_cur_subframe[i];
01048         float* window;
01049         int winlen = s->channel[c].prev_block_len;
01050         float* start = s->channel[c].coeffs - (winlen >> 1);
01051 
01052         if (s->subframe_len < winlen) {
01053             start += (winlen - s->subframe_len) >> 1;
01054             winlen = s->subframe_len;
01055         }
01056 
01057         window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
01058 
01059         winlen >>= 1;
01060 
01061         s->dsp.vector_fmul_window(start, start, start + winlen,
01062                                   window, winlen);
01063 
01064         s->channel[c].prev_block_len = s->subframe_len;
01065     }
01066 }
01067 
01073 static int decode_subframe(WMAProDecodeCtx *s)
01074 {
01075     int offset = s->samples_per_frame;
01076     int subframe_len = s->samples_per_frame;
01077     int i;
01078     int total_samples   = s->samples_per_frame * s->num_channels;
01079     int transmit_coeffs = 0;
01080     int cur_subwoofer_cutoff;
01081 
01082     s->subframe_offset = get_bits_count(&s->gb);
01083 
01088     for (i = 0; i < s->num_channels; i++) {
01089         s->channel[i].grouped = 0;
01090         if (offset > s->channel[i].decoded_samples) {
01091             offset = s->channel[i].decoded_samples;
01092             subframe_len =
01093                 s->channel[i].subframe_len[s->channel[i].cur_subframe];
01094         }
01095     }
01096 
01097     av_dlog(s->avctx,
01098             "processing subframe with offset %i len %i\n", offset, subframe_len);
01099 
01101     s->channels_for_cur_subframe = 0;
01102     for (i = 0; i < s->num_channels; i++) {
01103         const int cur_subframe = s->channel[i].cur_subframe;
01105         total_samples -= s->channel[i].decoded_samples;
01106 
01108         if (offset == s->channel[i].decoded_samples &&
01109             subframe_len == s->channel[i].subframe_len[cur_subframe]) {
01110             total_samples -= s->channel[i].subframe_len[cur_subframe];
01111             s->channel[i].decoded_samples +=
01112                 s->channel[i].subframe_len[cur_subframe];
01113             s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
01114             ++s->channels_for_cur_subframe;
01115         }
01116     }
01117 
01120     if (!total_samples)
01121         s->parsed_all_subframes = 1;
01122 
01123 
01124     av_dlog(s->avctx, "subframe is part of %i channels\n",
01125             s->channels_for_cur_subframe);
01126 
01128     s->table_idx         = av_log2(s->samples_per_frame/subframe_len);
01129     s->num_bands         = s->num_sfb[s->table_idx];
01130     s->cur_sfb_offsets   = s->sfb_offsets[s->table_idx];
01131     cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
01132 
01134     offset += s->samples_per_frame >> 1;
01135 
01136     for (i = 0; i < s->channels_for_cur_subframe; i++) {
01137         int c = s->channel_indexes_for_cur_subframe[i];
01138 
01139         s->channel[c].coeffs = &s->channel[c].out[offset];
01140     }
01141 
01142     s->subframe_len = subframe_len;
01143     s->esc_len = av_log2(s->subframe_len - 1) + 1;
01144 
01146     if (get_bits1(&s->gb)) {
01147         int num_fill_bits;
01148         if (!(num_fill_bits = get_bits(&s->gb, 2))) {
01149             int len = get_bits(&s->gb, 4);
01150             num_fill_bits = get_bits(&s->gb, len) + 1;
01151         }
01152 
01153         if (num_fill_bits >= 0) {
01154             if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
01155                 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
01156                 return AVERROR_INVALIDDATA;
01157             }
01158 
01159             skip_bits_long(&s->gb, num_fill_bits);
01160         }
01161     }
01162 
01164     if (get_bits1(&s->gb)) {
01165         av_log_ask_for_sample(s->avctx, "reserved bit set\n");
01166         return AVERROR_INVALIDDATA;
01167     }
01168 
01169 
01170     if (decode_channel_transform(s) < 0)
01171         return AVERROR_INVALIDDATA;
01172 
01173 
01174     for (i = 0; i < s->channels_for_cur_subframe; i++) {
01175         int c = s->channel_indexes_for_cur_subframe[i];
01176         if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
01177             transmit_coeffs = 1;
01178     }
01179 
01180     if (transmit_coeffs) {
01181         int step;
01182         int quant_step = 90 * s->bits_per_sample >> 4;
01183 
01185         if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
01186             int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
01187             for (i = 0; i < s->channels_for_cur_subframe; i++) {
01188                 int c = s->channel_indexes_for_cur_subframe[i];
01189                 int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
01190                 if (num_vec_coeffs + offset > FF_ARRAY_ELEMS(s->channel[c].out)) {
01191                     av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
01192                     return AVERROR_INVALIDDATA;
01193                 }
01194                 s->channel[c].num_vec_coeffs = num_vec_coeffs;
01195             }
01196         } else {
01197             for (i = 0; i < s->channels_for_cur_subframe; i++) {
01198                 int c = s->channel_indexes_for_cur_subframe[i];
01199                 s->channel[c].num_vec_coeffs = s->subframe_len;
01200             }
01201         }
01203         step = get_sbits(&s->gb, 6);
01204         quant_step += step;
01205         if (step == -32 || step == 31) {
01206             const int sign = (step == 31) - 1;
01207             int quant = 0;
01208             while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
01209                    (step = get_bits(&s->gb, 5)) == 31) {
01210                 quant += 31;
01211             }
01212             quant_step += ((quant + step) ^ sign) - sign;
01213         }
01214         if (quant_step < 0) {
01215             av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
01216         }
01217 
01220         if (s->channels_for_cur_subframe == 1) {
01221             s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
01222         } else {
01223             int modifier_len = get_bits(&s->gb, 3);
01224             for (i = 0; i < s->channels_for_cur_subframe; i++) {
01225                 int c = s->channel_indexes_for_cur_subframe[i];
01226                 s->channel[c].quant_step = quant_step;
01227                 if (get_bits1(&s->gb)) {
01228                     if (modifier_len) {
01229                         s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
01230                     } else
01231                         ++s->channel[c].quant_step;
01232                 }
01233             }
01234         }
01235 
01237         if (decode_scale_factors(s) < 0)
01238             return AVERROR_INVALIDDATA;
01239     }
01240 
01241     av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
01242             get_bits_count(&s->gb) - s->subframe_offset);
01243 
01245     for (i = 0; i < s->channels_for_cur_subframe; i++) {
01246         int c = s->channel_indexes_for_cur_subframe[i];
01247         if (s->channel[c].transmit_coefs &&
01248             get_bits_count(&s->gb) < s->num_saved_bits) {
01249             decode_coeffs(s, c);
01250         } else
01251             memset(s->channel[c].coeffs, 0,
01252                    sizeof(*s->channel[c].coeffs) * subframe_len);
01253     }
01254 
01255     av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
01256             get_bits_count(&s->gb) - s->subframe_offset);
01257 
01258     if (transmit_coeffs) {
01259         FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
01261         inverse_channel_transform(s);
01262         for (i = 0; i < s->channels_for_cur_subframe; i++) {
01263             int c = s->channel_indexes_for_cur_subframe[i];
01264             const int* sf = s->channel[c].scale_factors;
01265             int b;
01266 
01267             if (c == s->lfe_channel)
01268                 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
01269                        (subframe_len - cur_subwoofer_cutoff));
01270 
01272             for (b = 0; b < s->num_bands; b++) {
01273                 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
01274                 const int exp = s->channel[c].quant_step -
01275                             (s->channel[c].max_scale_factor - *sf++) *
01276                             s->channel[c].scale_factor_step;
01277                 const float quant = pow(10.0, exp / 20.0);
01278                 int start = s->cur_sfb_offsets[b];
01279                 s->dsp.vector_fmul_scalar(s->tmp + start,
01280                                           s->channel[c].coeffs + start,
01281                                           quant, end - start);
01282             }
01283 
01285             mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp);
01286         }
01287     }
01288 
01290     wmapro_window(s);
01291 
01293     for (i = 0; i < s->channels_for_cur_subframe; i++) {
01294         int c = s->channel_indexes_for_cur_subframe[i];
01295         if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
01296             av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
01297             return AVERROR_INVALIDDATA;
01298         }
01299         ++s->channel[c].cur_subframe;
01300     }
01301 
01302     return 0;
01303 }
01304 
01311 static int decode_frame(WMAProDecodeCtx *s, int *got_frame_ptr)
01312 {
01313     AVCodecContext *avctx = s->avctx;
01314     GetBitContext* gb = &s->gb;
01315     int more_frames = 0;
01316     int len = 0;
01317     int i, ret;
01318     const float *out_ptr[WMAPRO_MAX_CHANNELS];
01319     float *samples;
01320 
01322     if (s->len_prefix)
01323         len = get_bits(gb, s->log2_frame_size);
01324 
01325     av_dlog(s->avctx, "decoding frame with length %x\n", len);
01326 
01328     if (decode_tilehdr(s)) {
01329         s->packet_loss = 1;
01330         return 0;
01331     }
01332 
01334     if (s->num_channels > 1 && get_bits1(gb)) {
01335         if (get_bits1(gb)) {
01336             for (i = 0; i < s->num_channels * s->num_channels; i++)
01337                 skip_bits(gb, 4);
01338         }
01339     }
01340 
01342     if (s->dynamic_range_compression) {
01343         s->drc_gain = get_bits(gb, 8);
01344         av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
01345     }
01346 
01349     if (get_bits1(gb)) {
01350         int av_unused skip;
01351 
01353         if (get_bits1(gb)) {
01354             skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01355             av_dlog(s->avctx, "start skip: %i\n", skip);
01356         }
01357 
01359         if (get_bits1(gb)) {
01360             skip = get_bits(gb, av_log2(s->samples_per_frame * 2));
01361             av_dlog(s->avctx, "end skip: %i\n", skip);
01362         }
01363 
01364     }
01365 
01366     av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
01367             get_bits_count(gb) - s->frame_offset);
01368 
01370     s->parsed_all_subframes = 0;
01371     for (i = 0; i < s->num_channels; i++) {
01372         s->channel[i].decoded_samples = 0;
01373         s->channel[i].cur_subframe    = 0;
01374         s->channel[i].reuse_sf        = 0;
01375     }
01376 
01378     while (!s->parsed_all_subframes) {
01379         if (decode_subframe(s) < 0) {
01380             s->packet_loss = 1;
01381             return 0;
01382         }
01383     }
01384 
01385     /* get output buffer */
01386     s->frame.nb_samples = s->samples_per_frame;
01387     if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
01388         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
01389         s->packet_loss = 1;
01390         return 0;
01391     }
01392     samples = (float *)s->frame.data[0];
01393 
01395     for (i = 0; i < s->num_channels; i++)
01396         out_ptr[i] = s->channel[i].out;
01397     s->fmt_conv.float_interleave(samples, out_ptr, s->samples_per_frame,
01398                                  s->num_channels);
01399 
01400     for (i = 0; i < s->num_channels; i++) {
01402         memcpy(&s->channel[i].out[0],
01403                &s->channel[i].out[s->samples_per_frame],
01404                s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
01405     }
01406 
01407     if (s->skip_frame) {
01408         s->skip_frame = 0;
01409         *got_frame_ptr = 0;
01410     } else {
01411         *got_frame_ptr = 1;
01412     }
01413 
01414     if (s->len_prefix) {
01415         if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
01417             av_log(s->avctx, AV_LOG_ERROR,
01418                    "frame[%i] would have to skip %i bits\n", s->frame_num,
01419                    len - (get_bits_count(gb) - s->frame_offset) - 1);
01420             s->packet_loss = 1;
01421             return 0;
01422         }
01423 
01425         skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
01426     } else {
01427         while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
01428         }
01429     }
01430 
01432     more_frames = get_bits1(gb);
01433 
01434     ++s->frame_num;
01435     return more_frames;
01436 }
01437 
01444 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
01445 {
01446     return s->buf_bit_size - get_bits_count(gb);
01447 }
01448 
01456 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
01457                       int append)
01458 {
01459     int buflen;
01460 
01465     if (!append) {
01466         s->frame_offset = get_bits_count(gb) & 7;
01467         s->num_saved_bits = s->frame_offset;
01468         init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
01469     }
01470 
01471     buflen = (s->num_saved_bits + len + 8) >> 3;
01472 
01473     if (len <= 0 || buflen > MAX_FRAMESIZE) {
01474         av_log_ask_for_sample(s->avctx, "input buffer too small\n");
01475         s->packet_loss = 1;
01476         return;
01477     }
01478 
01479     if (len > put_bits_left(&s->pb)) {
01480         av_log(s->avctx, AV_LOG_ERROR,
01481                "Cannot append %d bits, only %d bits available.\n",
01482                len, put_bits_left(&s->pb));
01483         s->packet_loss = 1;
01484         return;
01485     }
01486 
01487     s->num_saved_bits += len;
01488     if (!append) {
01489         avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
01490                      s->num_saved_bits);
01491     } else {
01492         int align = 8 - (get_bits_count(gb) & 7);
01493         align = FFMIN(align, len);
01494         put_bits(&s->pb, align, get_bits(gb, align));
01495         len -= align;
01496         avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
01497     }
01498     skip_bits_long(gb, len);
01499 
01500     {
01501         PutBitContext tmp = s->pb;
01502         flush_put_bits(&tmp);
01503     }
01504 
01505     init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
01506     skip_bits(&s->gb, s->frame_offset);
01507 }
01508 
01517 static int decode_packet(AVCodecContext *avctx, void *data,
01518                          int *got_frame_ptr, AVPacket* avpkt)
01519 {
01520     WMAProDecodeCtx *s = avctx->priv_data;
01521     GetBitContext* gb  = &s->pgb;
01522     const uint8_t* buf = avpkt->data;
01523     int buf_size       = avpkt->size;
01524     int num_bits_prev_frame;
01525     int packet_sequence_number;
01526 
01527     *got_frame_ptr = 0;
01528 
01529     if (s->packet_done || s->packet_loss) {
01530         s->packet_done = 0;
01531 
01533         if (buf_size < avctx->block_align) {
01534             av_log(avctx, AV_LOG_ERROR, "Input packet too small (%d < %d)\n",
01535                    buf_size, avctx->block_align);
01536             return AVERROR_INVALIDDATA;
01537         }
01538 
01539         s->next_packet_start = buf_size - avctx->block_align;
01540         buf_size = avctx->block_align;
01541         s->buf_bit_size = buf_size << 3;
01542 
01544         init_get_bits(gb, buf, s->buf_bit_size);
01545         packet_sequence_number = get_bits(gb, 4);
01546         skip_bits(gb, 2);
01547 
01549         num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
01550         av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
01551                 num_bits_prev_frame);
01552 
01554         if (!s->packet_loss &&
01555             ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
01556             s->packet_loss = 1;
01557             av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n",
01558                    s->packet_sequence_number, packet_sequence_number);
01559         }
01560         s->packet_sequence_number = packet_sequence_number;
01561 
01562         if (num_bits_prev_frame > 0) {
01563             int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
01564             if (num_bits_prev_frame >= remaining_packet_bits) {
01565                 num_bits_prev_frame = remaining_packet_bits;
01566                 s->packet_done = 1;
01567             }
01568 
01571             save_bits(s, gb, num_bits_prev_frame, 1);
01572             av_dlog(avctx, "accumulated %x bits of frame data\n",
01573                     s->num_saved_bits - s->frame_offset);
01574 
01576             if (!s->packet_loss)
01577                 decode_frame(s, got_frame_ptr);
01578         } else if (s->num_saved_bits - s->frame_offset) {
01579             av_dlog(avctx, "ignoring %x previously saved bits\n",
01580                     s->num_saved_bits - s->frame_offset);
01581         }
01582 
01583         if (s->packet_loss) {
01587             s->num_saved_bits = 0;
01588             s->packet_loss = 0;
01589         }
01590 
01591     } else {
01592         int frame_size;
01593         s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
01594         init_get_bits(gb, avpkt->data, s->buf_bit_size);
01595         skip_bits(gb, s->packet_offset);
01596         if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
01597             (frame_size = show_bits(gb, s->log2_frame_size)) &&
01598             frame_size <= remaining_bits(s, gb)) {
01599             save_bits(s, gb, frame_size, 0);
01600             s->packet_done = !decode_frame(s, got_frame_ptr);
01601         } else if (!s->len_prefix
01602                    && s->num_saved_bits > get_bits_count(&s->gb)) {
01610             s->packet_done = !decode_frame(s, got_frame_ptr);
01611         } else
01612             s->packet_done = 1;
01613     }
01614 
01615     if (s->packet_done && !s->packet_loss &&
01616         remaining_bits(s, gb) > 0) {
01619         save_bits(s, gb, remaining_bits(s, gb), 0);
01620     }
01621 
01622     s->packet_offset = get_bits_count(gb) & 7;
01623     if (s->packet_loss)
01624         return AVERROR_INVALIDDATA;
01625 
01626     if (*got_frame_ptr)
01627         *(AVFrame *)data = s->frame;
01628 
01629     return get_bits_count(gb) >> 3;
01630 }
01631 
01636 static void flush(AVCodecContext *avctx)
01637 {
01638     WMAProDecodeCtx *s = avctx->priv_data;
01639     int i;
01642     for (i = 0; i < s->num_channels; i++)
01643         memset(s->channel[i].out, 0, s->samples_per_frame *
01644                sizeof(*s->channel[i].out));
01645     s->packet_loss = 1;
01646 }
01647 
01648 
01652 AVCodec ff_wmapro_decoder = {
01653     .name           = "wmapro",
01654     .type           = AVMEDIA_TYPE_AUDIO,
01655     .id             = CODEC_ID_WMAPRO,
01656     .priv_data_size = sizeof(WMAProDecodeCtx),
01657     .init           = decode_init,
01658     .close          = decode_end,
01659     .decode         = decode_packet,
01660     .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
01661     .flush= flush,
01662     .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"),
01663 };