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Diffstat (limited to 'contrib/ffmpeg/libavcodec/cook.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/cook.c | 1147 |
1 files changed, 0 insertions, 1147 deletions
diff --git a/contrib/ffmpeg/libavcodec/cook.c b/contrib/ffmpeg/libavcodec/cook.c deleted file mode 100644 index 32b1081cc..000000000 --- a/contrib/ffmpeg/libavcodec/cook.c +++ /dev/null @@ -1,1147 +0,0 @@ -/* - * COOK compatible decoder - * Copyright (c) 2003 Sascha Sommer - * Copyright (c) 2005 Benjamin Larsson - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - * - */ - -/** - * @file cook.c - * Cook compatible decoder. - * This decoder handles RealNetworks, RealAudio G2 data. - * Cook is identified by the codec name cook in RM files. - * - * To use this decoder, a calling application must supply the extradata - * bytes provided from the RM container; 8+ bytes for mono streams and - * 16+ for stereo streams (maybe more). - * - * Codec technicalities (all this assume a buffer length of 1024): - * Cook works with several different techniques to achieve its compression. - * In the timedomain the buffer is divided into 8 pieces and quantized. If - * two neighboring pieces have different quantization index a smooth - * quantization curve is used to get a smooth overlap between the different - * pieces. - * To get to the transformdomain Cook uses a modulated lapped transform. - * The transform domain has 50 subbands with 20 elements each. This - * means only a maximum of 50*20=1000 coefficients are used out of the 1024 - * available. - */ - -#include <math.h> -#include <stddef.h> -#include <stdio.h> - -#include "avcodec.h" -#include "bitstream.h" -#include "dsputil.h" -#include "common.h" -#include "bytestream.h" -#include "random.h" - -#include "cookdata.h" - -/* the different Cook versions */ -#define MONO 0x1000001 -#define STEREO 0x1000002 -#define JOINT_STEREO 0x1000003 -#define MC_COOK 0x2000000 //multichannel Cook, not supported - -#define SUBBAND_SIZE 20 -//#define COOKDEBUG - -typedef struct { - int *now; - int *previous; -} cook_gains; - -typedef struct { - GetBitContext gb; - /* stream data */ - int nb_channels; - int joint_stereo; - int bit_rate; - int sample_rate; - int samples_per_channel; - int samples_per_frame; - int subbands; - int log2_numvector_size; - int numvector_size; //1 << log2_numvector_size; - int js_subband_start; - int total_subbands; - int num_vectors; - int bits_per_subpacket; - int cookversion; - /* states */ - AVRandomState random_state; - - /* transform data */ - MDCTContext mdct_ctx; - DECLARE_ALIGNED_16(FFTSample, mdct_tmp[1024]); /* temporary storage for imlt */ - float* mlt_window; - - /* gain buffers */ - cook_gains gains1; - cook_gains gains2; - int gain_1[9]; - int gain_2[9]; - int gain_3[9]; - int gain_4[9]; - - /* VLC data */ - int js_vlc_bits; - VLC envelope_quant_index[13]; - VLC sqvh[7]; //scalar quantization - VLC ccpl; //channel coupling - - /* generatable tables and related variables */ - int gain_size_factor; - float gain_table[23]; - float pow2tab[127]; - float rootpow2tab[127]; - - /* data buffers */ - - uint8_t* decoded_bytes_buffer; - DECLARE_ALIGNED_16(float,mono_mdct_output[2048]); - float mono_previous_buffer1[1024]; - float mono_previous_buffer2[1024]; - float decode_buffer_1[1024]; - float decode_buffer_2[1024]; -} COOKContext; - -/* debug functions */ - -#ifdef COOKDEBUG -static void dump_float_table(float* table, int size, int delimiter) { - int i=0; - av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i); - for (i=0 ; i<size ; i++) { - av_log(NULL, AV_LOG_ERROR, "%5.1f, ", table[i]); - if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1); - } -} - -static void dump_int_table(int* table, int size, int delimiter) { - int i=0; - av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i); - for (i=0 ; i<size ; i++) { - av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]); - if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1); - } -} - -static void dump_short_table(short* table, int size, int delimiter) { - int i=0; - av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i); - for (i=0 ; i<size ; i++) { - av_log(NULL, AV_LOG_ERROR, "%d, ", table[i]); - if ((i+1)%delimiter == 0) av_log(NULL,AV_LOG_ERROR,"\n[%d]: ",i+1); - } -} - -#endif - -/*************** init functions ***************/ - -/* table generator */ -static void init_pow2table(COOKContext *q){ - int i; - q->pow2tab[63] = 1.0; - for (i=1 ; i<64 ; i++){ - q->pow2tab[63+i]=(float)((uint64_t)1<<i); - q->pow2tab[63-i]=1.0/(float)((uint64_t)1<<i); - } -} - -/* table generator */ -static void init_rootpow2table(COOKContext *q){ - int i; - q->rootpow2tab[63] = 1.0; - for (i=1 ; i<64 ; i++){ - q->rootpow2tab[63+i]=sqrt((float)((uint64_t)1<<i)); - q->rootpow2tab[63-i]=sqrt(1.0/(float)((uint64_t)1<<i)); - } -} - -/* table generator */ -static void init_gain_table(COOKContext *q) { - int i; - q->gain_size_factor = q->samples_per_channel/8; - for (i=0 ; i<23 ; i++) { - q->gain_table[i] = pow((double)q->pow2tab[i+52] , - (1.0/(double)q->gain_size_factor)); - } -} - - -static int init_cook_vlc_tables(COOKContext *q) { - int i, result; - - result = 0; - for (i=0 ; i<13 ; i++) { - result &= init_vlc (&q->envelope_quant_index[i], 9, 24, - envelope_quant_index_huffbits[i], 1, 1, - envelope_quant_index_huffcodes[i], 2, 2, 0); - } - av_log(NULL,AV_LOG_DEBUG,"sqvh VLC init\n"); - for (i=0 ; i<7 ; i++) { - result &= init_vlc (&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i], - cvh_huffbits[i], 1, 1, - cvh_huffcodes[i], 2, 2, 0); - } - - if (q->nb_channels==2 && q->joint_stereo==1){ - result &= init_vlc (&q->ccpl, 6, (1<<q->js_vlc_bits)-1, - ccpl_huffbits[q->js_vlc_bits-2], 1, 1, - ccpl_huffcodes[q->js_vlc_bits-2], 2, 2, 0); - av_log(NULL,AV_LOG_DEBUG,"Joint-stereo VLC used.\n"); - } - - av_log(NULL,AV_LOG_DEBUG,"VLC tables initialized.\n"); - return result; -} - -static int init_cook_mlt(COOKContext *q) { - int j; - float alpha; - int mlt_size = q->samples_per_channel; - - if ((q->mlt_window = av_malloc(sizeof(float)*mlt_size)) == 0) - return -1; - - /* Initialize the MLT window: simple sine window. */ - alpha = M_PI / (2.0 * (float)mlt_size); - for(j=0 ; j<mlt_size ; j++) - q->mlt_window[j] = sin((j + 0.5) * alpha) * sqrt(2.0 / q->samples_per_channel); - - /* Initialize the MDCT. */ - if (ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size)+1, 1)) { - av_free(q->mlt_window); - return -1; - } - av_log(NULL,AV_LOG_DEBUG,"MDCT initialized, order = %d.\n", - av_log2(mlt_size)+1); - - return 0; -} - -/*************** init functions end ***********/ - -/** - * Cook indata decoding, every 32 bits are XORed with 0x37c511f2. - * Why? No idea, some checksum/error detection method maybe. - * - * Out buffer size: extra bytes are needed to cope with - * padding/missalignment. - * Subpackets passed to the decoder can contain two, consecutive - * half-subpackets, of identical but arbitrary size. - * 1234 1234 1234 1234 extraA extraB - * Case 1: AAAA BBBB 0 0 - * Case 2: AAAA ABBB BB-- 3 3 - * Case 3: AAAA AABB BBBB 2 2 - * Case 4: AAAA AAAB BBBB BB-- 1 5 - * - * Nice way to waste CPU cycles. - * - * @param inbuffer pointer to byte array of indata - * @param out pointer to byte array of outdata - * @param bytes number of bytes - */ -#define DECODE_BYTES_PAD1(bytes) (3 - ((bytes)+3) % 4) -#define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes))) - -static inline int decode_bytes(uint8_t* inbuffer, uint8_t* out, int bytes){ - int i, off; - uint32_t c; - uint32_t* buf; - uint32_t* obuf = (uint32_t*) out; - /* FIXME: 64 bit platforms would be able to do 64 bits at a time. - * I'm too lazy though, should be something like - * for(i=0 ; i<bitamount/64 ; i++) - * (int64_t)out[i] = 0x37c511f237c511f2^be2me_64(int64_t)in[i]); - * Buffer alignment needs to be checked. */ - - off = (int)((long)inbuffer & 3); - buf = (uint32_t*) (inbuffer - off); - c = be2me_32((0x37c511f2 >> (off*8)) | (0x37c511f2 << (32-(off*8)))); - bytes += 3 + off; - for (i = 0; i < bytes/4; i++) - obuf[i] = c ^ buf[i]; - - return off; -} - -/** - * Cook uninit - */ - -static int cook_decode_close(AVCodecContext *avctx) -{ - int i; - COOKContext *q = avctx->priv_data; - av_log(avctx,AV_LOG_DEBUG, "Deallocating memory.\n"); - - /* Free allocated memory buffers. */ - av_free(q->mlt_window); - av_free(q->decoded_bytes_buffer); - - /* Free the transform. */ - ff_mdct_end(&q->mdct_ctx); - - /* Free the VLC tables. */ - for (i=0 ; i<13 ; i++) { - free_vlc(&q->envelope_quant_index[i]); - } - for (i=0 ; i<7 ; i++) { - free_vlc(&q->sqvh[i]); - } - if(q->nb_channels==2 && q->joint_stereo==1 ){ - free_vlc(&q->ccpl); - } - - av_log(NULL,AV_LOG_DEBUG,"Memory deallocated.\n"); - - return 0; -} - -/** - * Fill the gain array for the timedomain quantization. - * - * @param q pointer to the COOKContext - * @param gaininfo[9] array of gain indices - */ - -static void decode_gain_info(GetBitContext *gb, int *gaininfo) -{ - int i, n; - - while (get_bits1(gb)) {} - n = get_bits_count(gb) - 1; //amount of elements*2 to update - - i = 0; - while (n--) { - int index = get_bits(gb, 3); - int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1; - - while (i <= index) gaininfo[i++] = gain; - } - while (i <= 8) gaininfo[i++] = 0; -} - -/** - * Create the quant index table needed for the envelope. - * - * @param q pointer to the COOKContext - * @param quant_index_table pointer to the array - */ - -static void decode_envelope(COOKContext *q, int* quant_index_table) { - int i,j, vlc_index; - int bitbias; - - bitbias = get_bits_count(&q->gb); - quant_index_table[0]= get_bits(&q->gb,6) - 6; //This is used later in categorize - - for (i=1 ; i < q->total_subbands ; i++){ - vlc_index=i; - if (i >= q->js_subband_start * 2) { - vlc_index-=q->js_subband_start; - } else { - vlc_index/=2; - if(vlc_index < 1) vlc_index = 1; - } - if (vlc_index>13) vlc_index = 13; //the VLC tables >13 are identical to No. 13 - - j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index-1].table, - q->envelope_quant_index[vlc_index-1].bits,2); - quant_index_table[i] = quant_index_table[i-1] + j - 12; //differential encoding - } -} - -/** - * Calculate the category and category_index vector. - * - * @param q pointer to the COOKContext - * @param quant_index_table pointer to the array - * @param category pointer to the category array - * @param category_index pointer to the category_index array - */ - -static void categorize(COOKContext *q, int* quant_index_table, - int* category, int* category_index){ - int exp_idx, bias, tmpbias, bits_left, num_bits, index, v, i, j; - int exp_index2[102]; - int exp_index1[102]; - - int tmp_categorize_array1[128]; - int tmp_categorize_array1_idx=0; - int tmp_categorize_array2[128]; - int tmp_categorize_array2_idx=0; - int category_index_size=0; - - bits_left = q->bits_per_subpacket - get_bits_count(&q->gb); - - if(bits_left > q->samples_per_channel) { - bits_left = q->samples_per_channel + - ((bits_left - q->samples_per_channel)*5)/8; - //av_log(NULL, AV_LOG_ERROR, "bits_left = %d\n",bits_left); - } - - memset(&exp_index1,0,102*sizeof(int)); - memset(&exp_index2,0,102*sizeof(int)); - memset(&tmp_categorize_array1,0,128*sizeof(int)); - memset(&tmp_categorize_array2,0,128*sizeof(int)); - - bias=-32; - - /* Estimate bias. */ - for (i=32 ; i>0 ; i=i/2){ - num_bits = 0; - index = 0; - for (j=q->total_subbands ; j>0 ; j--){ - exp_idx = (i - quant_index_table[index] + bias) / 2; - if (exp_idx<0){ - exp_idx=0; - } else if(exp_idx >7) { - exp_idx=7; - } - index++; - num_bits+=expbits_tab[exp_idx]; - } - if(num_bits >= bits_left - 32){ - bias+=i; - } - } - - /* Calculate total number of bits. */ - num_bits=0; - for (i=0 ; i<q->total_subbands ; i++) { - exp_idx = (bias - quant_index_table[i]) / 2; - if (exp_idx<0) { - exp_idx=0; - } else if(exp_idx >7) { - exp_idx=7; - } - num_bits += expbits_tab[exp_idx]; - exp_index1[i] = exp_idx; - exp_index2[i] = exp_idx; - } - tmpbias = bias = num_bits; - - for (j = 1 ; j < q->numvector_size ; j++) { - if (tmpbias + bias > 2*bits_left) { /* ---> */ - int max = -999999; - index=-1; - for (i=0 ; i<q->total_subbands ; i++){ - if (exp_index1[i] < 7) { - v = (-2*exp_index1[i]) - quant_index_table[i] - 32; - if ( v >= max) { - max = v; - index = i; - } - } - } - if(index==-1)break; - tmp_categorize_array1[tmp_categorize_array1_idx++] = index; - tmpbias -= expbits_tab[exp_index1[index]] - - expbits_tab[exp_index1[index]+1]; - ++exp_index1[index]; - } else { /* <--- */ - int min = 999999; - index=-1; - for (i=0 ; i<q->total_subbands ; i++){ - if(exp_index2[i] > 0){ - v = (-2*exp_index2[i])-quant_index_table[i]; - if ( v < min) { - min = v; - index = i; - } - } - } - if(index == -1)break; - tmp_categorize_array2[tmp_categorize_array2_idx++] = index; - tmpbias -= expbits_tab[exp_index2[index]] - - expbits_tab[exp_index2[index]-1]; - --exp_index2[index]; - } - } - - for(i=0 ; i<q->total_subbands ; i++) - category[i] = exp_index2[i]; - - /* Concatenate the two arrays. */ - for(i=tmp_categorize_array2_idx-1 ; i >= 0; i--) - category_index[category_index_size++] = tmp_categorize_array2[i]; - - for(i=0;i<tmp_categorize_array1_idx;i++) - category_index[category_index_size++ ] = tmp_categorize_array1[i]; - - /* FIXME: mc_sich_ra8_20.rm triggers this, not sure with what we - should fill the remaining bytes. */ - for(i=category_index_size;i<q->numvector_size;i++) - category_index[i]=0; - -} - - -/** - * Expand the category vector. - * - * @param q pointer to the COOKContext - * @param category pointer to the category array - * @param category_index pointer to the category_index array - */ - -static void inline expand_category(COOKContext *q, int* category, - int* category_index){ - int i; - for(i=0 ; i<q->num_vectors ; i++){ - ++category[category_index[i]]; - } -} - -/** - * The real requantization of the mltcoefs - * - * @param q pointer to the COOKContext - * @param index index - * @param quant_index quantisation index - * @param subband_coef_index array of indexes to quant_centroid_tab - * @param subband_coef_sign signs of coefficients - * @param mlt_p pointer into the mlt buffer - */ - -static void scalar_dequant(COOKContext *q, int index, int quant_index, - int* subband_coef_index, int* subband_coef_sign, - float* mlt_p){ - int i; - float f1; - - for(i=0 ; i<SUBBAND_SIZE ; i++) { - if (subband_coef_index[i]) { - f1 = quant_centroid_tab[index][subband_coef_index[i]]; - if (subband_coef_sign[i]) f1 = -f1; - } else { - /* noise coding if subband_coef_index[i] == 0 */ - f1 = dither_tab[index]; - if (av_random(&q->random_state) < 0x80000000) f1 = -f1; - } - mlt_p[i] = f1 * q->rootpow2tab[quant_index+63]; - } -} -/** - * Unpack the subband_coef_index and subband_coef_sign vectors. - * - * @param q pointer to the COOKContext - * @param category pointer to the category array - * @param subband_coef_index array of indexes to quant_centroid_tab - * @param subband_coef_sign signs of coefficients - */ - -static int unpack_SQVH(COOKContext *q, int category, int* subband_coef_index, - int* subband_coef_sign) { - int i,j; - int vlc, vd ,tmp, result; - int ub; - int cb; - - vd = vd_tab[category]; - result = 0; - for(i=0 ; i<vpr_tab[category] ; i++){ - ub = get_bits_count(&q->gb); - vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3); - cb = get_bits_count(&q->gb); - if (q->bits_per_subpacket < get_bits_count(&q->gb)){ - vlc = 0; - result = 1; - } - for(j=vd-1 ; j>=0 ; j--){ - tmp = (vlc * invradix_tab[category])/0x100000; - subband_coef_index[vd*i+j] = vlc - tmp * (kmax_tab[category]+1); - vlc = tmp; - } - for(j=0 ; j<vd ; j++){ - if (subband_coef_index[i*vd + j]) { - if(get_bits_count(&q->gb) < q->bits_per_subpacket){ - subband_coef_sign[i*vd+j] = get_bits1(&q->gb); - } else { - result=1; - subband_coef_sign[i*vd+j]=0; - } - } else { - subband_coef_sign[i*vd+j]=0; - } - } - } - return result; -} - - -/** - * Fill the mlt_buffer with mlt coefficients. - * - * @param q pointer to the COOKContext - * @param category pointer to the category array - * @param quant_index_table pointer to the array - * @param mlt_buffer pointer to mlt coefficients - */ - - -static void decode_vectors(COOKContext* q, int* category, - int *quant_index_table, float* mlt_buffer){ - /* A zero in this table means that the subband coefficient is - random noise coded. */ - int subband_coef_index[SUBBAND_SIZE]; - /* A zero in this table means that the subband coefficient is a - positive multiplicator. */ - int subband_coef_sign[SUBBAND_SIZE]; - int band, j; - int index=0; - - for(band=0 ; band<q->total_subbands ; band++){ - index = category[band]; - if(category[band] < 7){ - if(unpack_SQVH(q, category[band], subband_coef_index, subband_coef_sign)){ - index=7; - for(j=0 ; j<q->total_subbands ; j++) category[band+j]=7; - } - } - if(index==7) { - memset(subband_coef_index, 0, sizeof(subband_coef_index)); - memset(subband_coef_sign, 0, sizeof(subband_coef_sign)); - } - scalar_dequant(q, index, quant_index_table[band], - subband_coef_index, subband_coef_sign, - &mlt_buffer[band * 20]); - } - - if(q->total_subbands*SUBBAND_SIZE >= q->samples_per_channel){ - return; - } /* FIXME: should this be removed, or moved into loop above? */ -} - - -/** - * function for decoding mono data - * - * @param q pointer to the COOKContext - * @param mlt_buffer1 pointer to left channel mlt coefficients - * @param mlt_buffer2 pointer to right channel mlt coefficients - */ - -static void mono_decode(COOKContext *q, float* mlt_buffer) { - - int category_index[128]; - int quant_index_table[102]; - int category[128]; - - memset(&category, 0, 128*sizeof(int)); - memset(&category_index, 0, 128*sizeof(int)); - - decode_envelope(q, quant_index_table); - q->num_vectors = get_bits(&q->gb,q->log2_numvector_size); - categorize(q, quant_index_table, category, category_index); - expand_category(q, category, category_index); - decode_vectors(q, category, quant_index_table, mlt_buffer); -} - - -/** - * the actual requantization of the timedomain samples - * - * @param q pointer to the COOKContext - * @param buffer pointer to the timedomain buffer - * @param gain_index index for the block multiplier - * @param gain_index_next index for the next block multiplier - */ - -static void interpolate(COOKContext *q, float* buffer, - int gain_index, int gain_index_next){ - int i; - float fc1, fc2; - fc1 = q->pow2tab[gain_index+63]; - - if(gain_index == gain_index_next){ //static gain - for(i=0 ; i<q->gain_size_factor ; i++){ - buffer[i]*=fc1; - } - return; - } else { //smooth gain - fc2 = q->gain_table[11 + (gain_index_next-gain_index)]; - for(i=0 ; i<q->gain_size_factor ; i++){ - buffer[i]*=fc1; - fc1*=fc2; - } - return; - } -} - - -/** - * The modulated lapped transform, this takes transform coefficients - * and transforms them into timedomain samples. - * Apply transform window, overlap buffers, apply gain profile - * and buffer management. - * - * @param q pointer to the COOKContext - * @param inbuffer pointer to the mltcoefficients - * @param gains_ptr current and previous gains - * @param previous_buffer pointer to the previous buffer to be used for overlapping - */ - -static void imlt_gain(COOKContext *q, float *inbuffer, - cook_gains *gains_ptr, float* previous_buffer) -{ - const float fc = q->pow2tab[gains_ptr->previous[0] + 63]; - float *buffer0 = q->mono_mdct_output; - float *buffer1 = q->mono_mdct_output + q->samples_per_channel; - int i; - - /* Inverse modified discrete cosine transform */ - q->mdct_ctx.fft.imdct_calc(&q->mdct_ctx, q->mono_mdct_output, - inbuffer, q->mdct_tmp); - - /* The weird thing here, is that the two halves of the time domain - * buffer are swapped. Also, the newest data, that we save away for - * next frame, has the wrong sign. Hence the subtraction below. - * Almost sounds like a complex conjugate/reverse data/FFT effect. - */ - - /* Apply window and overlap */ - for(i = 0; i < q->samples_per_channel; i++){ - buffer1[i] = buffer1[i] * fc * q->mlt_window[i] - - previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i]; - } - - /* Apply gain profile */ - for (i = 0; i < 8; i++) { - if (gains_ptr->now[i] || gains_ptr->now[i + 1]) - interpolate(q, &buffer1[q->gain_size_factor * i], - gains_ptr->now[i], gains_ptr->now[i + 1]); - } - - /* Save away the current to be previous block. */ - memcpy(previous_buffer, buffer0, sizeof(float)*q->samples_per_channel); -} - - -/** - * function for getting the jointstereo coupling information - * - * @param q pointer to the COOKContext - * @param decouple_tab decoupling array - * - */ - -static void decouple_info(COOKContext *q, int* decouple_tab){ - int length, i; - - if(get_bits1(&q->gb)) { - if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return; - - length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1; - for (i=0 ; i<length ; i++) { - decouple_tab[cplband[q->js_subband_start] + i] = get_vlc2(&q->gb, q->ccpl.table, q->ccpl.bits, 2); - } - return; - } - - if(cplband[q->js_subband_start] > cplband[q->subbands-1]) return; - - length = cplband[q->subbands-1] - cplband[q->js_subband_start] + 1; - for (i=0 ; i<length ; i++) { - decouple_tab[cplband[q->js_subband_start] + i] = get_bits(&q->gb, q->js_vlc_bits); - } - return; -} - - -/** - * function for decoding joint stereo data - * - * @param q pointer to the COOKContext - * @param mlt_buffer1 pointer to left channel mlt coefficients - * @param mlt_buffer2 pointer to right channel mlt coefficients - */ - -static void joint_decode(COOKContext *q, float* mlt_buffer1, - float* mlt_buffer2) { - int i,j; - int decouple_tab[SUBBAND_SIZE]; - float decode_buffer[1060]; - int idx, cpl_tmp,tmp_idx; - float f1,f2; - float* cplscale; - - memset(decouple_tab, 0, sizeof(decouple_tab)); - memset(decode_buffer, 0, sizeof(decode_buffer)); - - /* Make sure the buffers are zeroed out. */ - memset(mlt_buffer1,0, 1024*sizeof(float)); - memset(mlt_buffer2,0, 1024*sizeof(float)); - decouple_info(q, decouple_tab); - mono_decode(q, decode_buffer); - - /* The two channels are stored interleaved in decode_buffer. */ - for (i=0 ; i<q->js_subband_start ; i++) { - for (j=0 ; j<SUBBAND_SIZE ; j++) { - mlt_buffer1[i*20+j] = decode_buffer[i*40+j]; - mlt_buffer2[i*20+j] = decode_buffer[i*40+20+j]; - } - } - - /* When we reach js_subband_start (the higher frequencies) - the coefficients are stored in a coupling scheme. */ - idx = (1 << q->js_vlc_bits) - 1; - for (i=q->js_subband_start ; i<q->subbands ; i++) { - cpl_tmp = cplband[i]; - idx -=decouple_tab[cpl_tmp]; - cplscale = (float*)cplscales[q->js_vlc_bits-2]; //choose decoupler table - f1 = cplscale[decouple_tab[cpl_tmp]]; - f2 = cplscale[idx-1]; - for (j=0 ; j<SUBBAND_SIZE ; j++) { - tmp_idx = ((q->js_subband_start + i)*20)+j; - mlt_buffer1[20*i + j] = f1 * decode_buffer[tmp_idx]; - mlt_buffer2[20*i + j] = f2 * decode_buffer[tmp_idx]; - } - idx = (1 << q->js_vlc_bits) - 1; - } -} - -/** - * First part of subpacket decoding: - * decode raw stream bytes and read gain info. - * - * @param q pointer to the COOKContext - * @param inbuffer pointer to raw stream data - * @param gain_ptr array of current/prev gain pointers - */ - -static inline void -decode_bytes_and_gain(COOKContext *q, uint8_t *inbuffer, - cook_gains *gains_ptr) -{ - int offset; - - offset = decode_bytes(inbuffer, q->decoded_bytes_buffer, - q->bits_per_subpacket/8); - init_get_bits(&q->gb, q->decoded_bytes_buffer + offset, - q->bits_per_subpacket); - decode_gain_info(&q->gb, gains_ptr->now); - - /* Swap current and previous gains */ - FFSWAP(int *, gains_ptr->now, gains_ptr->previous); -} - -/** - * Final part of subpacket decoding: - * Apply modulated lapped transform, gain compensation, - * clip and convert to integer. - * - * @param q pointer to the COOKContext - * @param decode_buffer pointer to the mlt coefficients - * @param gain_ptr array of current/prev gain pointers - * @param previous_buffer pointer to the previous buffer to be used for overlapping - * @param out pointer to the output buffer - * @param chan 0: left or single channel, 1: right channel - */ - -static inline void -mlt_compensate_output(COOKContext *q, float *decode_buffer, - cook_gains *gains, float *previous_buffer, - int16_t *out, int chan) -{ - float *output = q->mono_mdct_output + q->samples_per_channel; - int j; - - imlt_gain(q, decode_buffer, gains, previous_buffer); - - /* Clip and convert floats to 16 bits. - */ - for (j = 0; j < q->samples_per_channel; j++) { - out[chan + q->nb_channels * j] = - av_clip(lrintf(output[j]), -32768, 32767); - } -} - - -/** - * Cook subpacket decoding. This function returns one decoded subpacket, - * usually 1024 samples per channel. - * - * @param q pointer to the COOKContext - * @param inbuffer pointer to the inbuffer - * @param sub_packet_size subpacket size - * @param outbuffer pointer to the outbuffer - */ - - -static int decode_subpacket(COOKContext *q, uint8_t *inbuffer, - int sub_packet_size, int16_t *outbuffer) { - /* packet dump */ -// for (i=0 ; i<sub_packet_size ; i++) { -// av_log(NULL, AV_LOG_ERROR, "%02x", inbuffer[i]); -// } -// av_log(NULL, AV_LOG_ERROR, "\n"); - - decode_bytes_and_gain(q, inbuffer, &q->gains1); - - if (q->joint_stereo) { - joint_decode(q, q->decode_buffer_1, q->decode_buffer_2); - } else { - mono_decode(q, q->decode_buffer_1); - - if (q->nb_channels == 2) { - decode_bytes_and_gain(q, inbuffer + sub_packet_size/2, &q->gains2); - mono_decode(q, q->decode_buffer_2); - } - } - - mlt_compensate_output(q, q->decode_buffer_1, &q->gains1, - q->mono_previous_buffer1, outbuffer, 0); - - if (q->nb_channels == 2) { - if (q->joint_stereo) { - mlt_compensate_output(q, q->decode_buffer_2, &q->gains1, - q->mono_previous_buffer2, outbuffer, 1); - } else { - mlt_compensate_output(q, q->decode_buffer_2, &q->gains2, - q->mono_previous_buffer2, outbuffer, 1); - } - } - return q->samples_per_frame * sizeof(int16_t); -} - - -/** - * Cook frame decoding - * - * @param avctx pointer to the AVCodecContext - */ - -static int cook_decode_frame(AVCodecContext *avctx, - void *data, int *data_size, - uint8_t *buf, int buf_size) { - COOKContext *q = avctx->priv_data; - - if (buf_size < avctx->block_align) - return buf_size; - - *data_size = decode_subpacket(q, buf, avctx->block_align, data); - - /* Discard the first two frames: no valid audio. */ - if (avctx->frame_number < 2) *data_size = 0; - - return avctx->block_align; -} - -#ifdef COOKDEBUG -static void dump_cook_context(COOKContext *q) -{ - //int i=0; -#define PRINT(a,b) av_log(NULL,AV_LOG_ERROR," %s = %d\n", a, b); - av_log(NULL,AV_LOG_ERROR,"COOKextradata\n"); - av_log(NULL,AV_LOG_ERROR,"cookversion=%x\n",q->cookversion); - if (q->cookversion > STEREO) { - PRINT("js_subband_start",q->js_subband_start); - PRINT("js_vlc_bits",q->js_vlc_bits); - } - av_log(NULL,AV_LOG_ERROR,"COOKContext\n"); - PRINT("nb_channels",q->nb_channels); - PRINT("bit_rate",q->bit_rate); - PRINT("sample_rate",q->sample_rate); - PRINT("samples_per_channel",q->samples_per_channel); - PRINT("samples_per_frame",q->samples_per_frame); - PRINT("subbands",q->subbands); - PRINT("random_state",q->random_state); - PRINT("js_subband_start",q->js_subband_start); - PRINT("log2_numvector_size",q->log2_numvector_size); - PRINT("numvector_size",q->numvector_size); - PRINT("total_subbands",q->total_subbands); -} -#endif - -/** - * Cook initialization - * - * @param avctx pointer to the AVCodecContext - */ - -static int cook_decode_init(AVCodecContext *avctx) -{ - COOKContext *q = avctx->priv_data; - uint8_t *edata_ptr = avctx->extradata; - - /* Take care of the codec specific extradata. */ - if (avctx->extradata_size <= 0) { - av_log(avctx,AV_LOG_ERROR,"Necessary extradata missing!\n"); - return -1; - } else { - /* 8 for mono, 16 for stereo, ? for multichannel - Swap to right endianness so we don't need to care later on. */ - av_log(avctx,AV_LOG_DEBUG,"codecdata_length=%d\n",avctx->extradata_size); - if (avctx->extradata_size >= 8){ - q->cookversion = bytestream_get_be32(&edata_ptr); - q->samples_per_frame = bytestream_get_be16(&edata_ptr); - q->subbands = bytestream_get_be16(&edata_ptr); - } - if (avctx->extradata_size >= 16){ - bytestream_get_be32(&edata_ptr); //Unknown unused - q->js_subband_start = bytestream_get_be16(&edata_ptr); - q->js_vlc_bits = bytestream_get_be16(&edata_ptr); - } - } - - /* Take data from the AVCodecContext (RM container). */ - q->sample_rate = avctx->sample_rate; - q->nb_channels = avctx->channels; - q->bit_rate = avctx->bit_rate; - - /* Initialize RNG. */ - av_init_random(1, &q->random_state); - - /* Initialize extradata related variables. */ - q->samples_per_channel = q->samples_per_frame / q->nb_channels; - q->bits_per_subpacket = avctx->block_align * 8; - - /* Initialize default data states. */ - q->log2_numvector_size = 5; - q->total_subbands = q->subbands; - - /* Initialize version-dependent variables */ - av_log(NULL,AV_LOG_DEBUG,"q->cookversion=%x\n",q->cookversion); - q->joint_stereo = 0; - switch (q->cookversion) { - case MONO: - if (q->nb_channels != 1) { - av_log(avctx,AV_LOG_ERROR,"Container channels != 1, report sample!\n"); - return -1; - } - av_log(avctx,AV_LOG_DEBUG,"MONO\n"); - break; - case STEREO: - if (q->nb_channels != 1) { - q->bits_per_subpacket = q->bits_per_subpacket/2; - } - av_log(avctx,AV_LOG_DEBUG,"STEREO\n"); - break; - case JOINT_STEREO: - if (q->nb_channels != 2) { - av_log(avctx,AV_LOG_ERROR,"Container channels != 2, report sample!\n"); - return -1; - } - av_log(avctx,AV_LOG_DEBUG,"JOINT_STEREO\n"); - if (avctx->extradata_size >= 16){ - q->total_subbands = q->subbands + q->js_subband_start; - q->joint_stereo = 1; - } - if (q->samples_per_channel > 256) { - q->log2_numvector_size = 6; - } - if (q->samples_per_channel > 512) { - q->log2_numvector_size = 7; - } - break; - case MC_COOK: - av_log(avctx,AV_LOG_ERROR,"MC_COOK not supported!\n"); - return -1; - break; - default: - av_log(avctx,AV_LOG_ERROR,"Unknown Cook version, report sample!\n"); - return -1; - break; - } - - /* Initialize variable relations */ - q->numvector_size = (1 << q->log2_numvector_size); - - /* Generate tables */ - init_rootpow2table(q); - init_pow2table(q); - init_gain_table(q); - - if (init_cook_vlc_tables(q) != 0) - return -1; - - - if(avctx->block_align >= UINT_MAX/2) - return -1; - - /* Pad the databuffer with: - DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(), - FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */ - if (q->nb_channels==2 && q->joint_stereo==0) { - q->decoded_bytes_buffer = - av_mallocz(avctx->block_align/2 - + DECODE_BYTES_PAD2(avctx->block_align/2) - + FF_INPUT_BUFFER_PADDING_SIZE); - } else { - q->decoded_bytes_buffer = - av_mallocz(avctx->block_align - + DECODE_BYTES_PAD1(avctx->block_align) - + FF_INPUT_BUFFER_PADDING_SIZE); - } - if (q->decoded_bytes_buffer == NULL) - return -1; - - q->gains1.now = q->gain_1; - q->gains1.previous = q->gain_2; - q->gains2.now = q->gain_3; - q->gains2.previous = q->gain_4; - - /* Initialize transform. */ - if ( init_cook_mlt(q) != 0 ) - return -1; - - /* Try to catch some obviously faulty streams, othervise it might be exploitable */ - if (q->total_subbands > 53) { - av_log(avctx,AV_LOG_ERROR,"total_subbands > 53, report sample!\n"); - return -1; - } - if (q->subbands > 50) { - av_log(avctx,AV_LOG_ERROR,"subbands > 50, report sample!\n"); - return -1; - } - if ((q->samples_per_channel == 256) || (q->samples_per_channel == 512) || (q->samples_per_channel == 1024)) { - } else { - av_log(avctx,AV_LOG_ERROR,"unknown amount of samples_per_channel = %d, report sample!\n",q->samples_per_channel); - return -1; - } - if ((q->js_vlc_bits > 6) || (q->js_vlc_bits < 0)) { - av_log(avctx,AV_LOG_ERROR,"q->js_vlc_bits = %d, only >= 0 and <= 6 allowed!\n",q->js_vlc_bits); - return -1; - } - -#ifdef COOKDEBUG - dump_cook_context(q); -#endif - return 0; -} - - -AVCodec cook_decoder = -{ - .name = "cook", - .type = CODEC_TYPE_AUDIO, - .id = CODEC_ID_COOK, - .priv_data_size = sizeof(COOKContext), - .init = cook_decode_init, - .close = cook_decode_close, - .decode = cook_decode_frame, -}; |