yading@10: /* yading@10: * COOK compatible decoder yading@10: * Copyright (c) 2003 Sascha Sommer yading@10: * Copyright (c) 2005 Benjamin Larsson yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * Cook compatible decoder. Bastardization of the G.722.1 standard. yading@10: * This decoder handles RealNetworks, RealAudio G2 data. yading@10: * Cook is identified by the codec name cook in RM files. yading@10: * yading@10: * To use this decoder, a calling application must supply the extradata yading@10: * bytes provided from the RM container; 8+ bytes for mono streams and yading@10: * 16+ for stereo streams (maybe more). yading@10: * yading@10: * Codec technicalities (all this assume a buffer length of 1024): yading@10: * Cook works with several different techniques to achieve its compression. yading@10: * In the timedomain the buffer is divided into 8 pieces and quantized. If yading@10: * two neighboring pieces have different quantization index a smooth yading@10: * quantization curve is used to get a smooth overlap between the different yading@10: * pieces. yading@10: * To get to the transformdomain Cook uses a modulated lapped transform. yading@10: * The transform domain has 50 subbands with 20 elements each. This yading@10: * means only a maximum of 50*20=1000 coefficients are used out of the 1024 yading@10: * available. yading@10: */ yading@10: yading@10: #include "libavutil/channel_layout.h" yading@10: #include "libavutil/lfg.h" yading@10: #include "avcodec.h" yading@10: #include "get_bits.h" yading@10: #include "dsputil.h" yading@10: #include "bytestream.h" yading@10: #include "fft.h" yading@10: #include "internal.h" yading@10: #include "sinewin.h" yading@10: yading@10: #include "cookdata.h" yading@10: yading@10: /* the different Cook versions */ yading@10: #define MONO 0x1000001 yading@10: #define STEREO 0x1000002 yading@10: #define JOINT_STEREO 0x1000003 yading@10: #define MC_COOK 0x2000000 // multichannel Cook, not supported yading@10: yading@10: #define SUBBAND_SIZE 20 yading@10: #define MAX_SUBPACKETS 5 yading@10: yading@10: typedef struct { yading@10: int *now; yading@10: int *previous; yading@10: } cook_gains; yading@10: yading@10: typedef struct { yading@10: int ch_idx; yading@10: int size; yading@10: int num_channels; yading@10: int cookversion; yading@10: int subbands; yading@10: int js_subband_start; yading@10: int js_vlc_bits; yading@10: int samples_per_channel; yading@10: int log2_numvector_size; yading@10: unsigned int channel_mask; yading@10: VLC channel_coupling; yading@10: int joint_stereo; yading@10: int bits_per_subpacket; yading@10: int bits_per_subpdiv; yading@10: int total_subbands; yading@10: int numvector_size; // 1 << log2_numvector_size; yading@10: yading@10: float mono_previous_buffer1[1024]; yading@10: float mono_previous_buffer2[1024]; yading@10: yading@10: cook_gains gains1; yading@10: cook_gains gains2; yading@10: int gain_1[9]; yading@10: int gain_2[9]; yading@10: int gain_3[9]; yading@10: int gain_4[9]; yading@10: } COOKSubpacket; yading@10: yading@10: typedef struct cook { yading@10: /* yading@10: * The following 5 functions provide the lowlevel arithmetic on yading@10: * the internal audio buffers. yading@10: */ yading@10: void (*scalar_dequant)(struct cook *q, int index, int quant_index, yading@10: int *subband_coef_index, int *subband_coef_sign, yading@10: float *mlt_p); yading@10: yading@10: void (*decouple)(struct cook *q, yading@10: COOKSubpacket *p, yading@10: int subband, yading@10: float f1, float f2, yading@10: float *decode_buffer, yading@10: float *mlt_buffer1, float *mlt_buffer2); yading@10: yading@10: void (*imlt_window)(struct cook *q, float *buffer1, yading@10: cook_gains *gains_ptr, float *previous_buffer); yading@10: yading@10: void (*interpolate)(struct cook *q, float *buffer, yading@10: int gain_index, int gain_index_next); yading@10: yading@10: void (*saturate_output)(struct cook *q, float *out); yading@10: yading@10: AVCodecContext* avctx; yading@10: DSPContext dsp; yading@10: GetBitContext gb; yading@10: /* stream data */ yading@10: int num_vectors; yading@10: int samples_per_channel; yading@10: /* states */ yading@10: AVLFG random_state; yading@10: int discarded_packets; yading@10: yading@10: /* transform data */ yading@10: FFTContext mdct_ctx; yading@10: float* mlt_window; yading@10: yading@10: /* VLC data */ yading@10: VLC envelope_quant_index[13]; yading@10: VLC sqvh[7]; // scalar quantization yading@10: yading@10: /* generatable tables and related variables */ yading@10: int gain_size_factor; yading@10: float gain_table[23]; yading@10: yading@10: /* data buffers */ yading@10: yading@10: uint8_t* decoded_bytes_buffer; yading@10: DECLARE_ALIGNED(32, float, mono_mdct_output)[2048]; yading@10: float decode_buffer_1[1024]; yading@10: float decode_buffer_2[1024]; yading@10: float decode_buffer_0[1060]; /* static allocation for joint decode */ yading@10: yading@10: const float *cplscales[5]; yading@10: int num_subpackets; yading@10: COOKSubpacket subpacket[MAX_SUBPACKETS]; yading@10: } COOKContext; yading@10: yading@10: static float pow2tab[127]; yading@10: static float rootpow2tab[127]; yading@10: yading@10: /*************** init functions ***************/ yading@10: yading@10: /* table generator */ yading@10: static av_cold void init_pow2table(void) yading@10: { yading@10: int i; yading@10: for (i = -63; i < 64; i++) { yading@10: pow2tab[63 + i] = pow(2, i); yading@10: rootpow2tab[63 + i] = sqrt(pow(2, i)); yading@10: } yading@10: } yading@10: yading@10: /* table generator */ yading@10: static av_cold void init_gain_table(COOKContext *q) yading@10: { yading@10: int i; yading@10: q->gain_size_factor = q->samples_per_channel / 8; yading@10: for (i = 0; i < 23; i++) yading@10: q->gain_table[i] = pow(pow2tab[i + 52], yading@10: (1.0 / (double) q->gain_size_factor)); yading@10: } yading@10: yading@10: yading@10: static av_cold int init_cook_vlc_tables(COOKContext *q) yading@10: { yading@10: int i, result; yading@10: yading@10: result = 0; yading@10: for (i = 0; i < 13; i++) { yading@10: result |= init_vlc(&q->envelope_quant_index[i], 9, 24, yading@10: envelope_quant_index_huffbits[i], 1, 1, yading@10: envelope_quant_index_huffcodes[i], 2, 2, 0); yading@10: } yading@10: av_log(q->avctx, AV_LOG_DEBUG, "sqvh VLC init\n"); yading@10: for (i = 0; i < 7; i++) { yading@10: result |= init_vlc(&q->sqvh[i], vhvlcsize_tab[i], vhsize_tab[i], yading@10: cvh_huffbits[i], 1, 1, yading@10: cvh_huffcodes[i], 2, 2, 0); yading@10: } yading@10: yading@10: for (i = 0; i < q->num_subpackets; i++) { yading@10: if (q->subpacket[i].joint_stereo == 1) { yading@10: result |= init_vlc(&q->subpacket[i].channel_coupling, 6, yading@10: (1 << q->subpacket[i].js_vlc_bits) - 1, yading@10: ccpl_huffbits[q->subpacket[i].js_vlc_bits - 2], 1, 1, yading@10: ccpl_huffcodes[q->subpacket[i].js_vlc_bits - 2], 2, 2, 0); yading@10: av_log(q->avctx, AV_LOG_DEBUG, "subpacket %i Joint-stereo VLC used.\n", i); yading@10: } yading@10: } yading@10: yading@10: av_log(q->avctx, AV_LOG_DEBUG, "VLC tables initialized.\n"); yading@10: return result; yading@10: } yading@10: yading@10: static av_cold int init_cook_mlt(COOKContext *q) yading@10: { yading@10: int j, ret; yading@10: int mlt_size = q->samples_per_channel; yading@10: yading@10: if ((q->mlt_window = av_malloc(mlt_size * sizeof(*q->mlt_window))) == 0) yading@10: return AVERROR(ENOMEM); yading@10: yading@10: /* Initialize the MLT window: simple sine window. */ yading@10: ff_sine_window_init(q->mlt_window, mlt_size); yading@10: for (j = 0; j < mlt_size; j++) yading@10: q->mlt_window[j] *= sqrt(2.0 / q->samples_per_channel); yading@10: yading@10: /* Initialize the MDCT. */ yading@10: if ((ret = ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size) + 1, 1, 1.0 / 32768.0))) { yading@10: av_free(q->mlt_window); yading@10: return ret; yading@10: } yading@10: av_log(q->avctx, AV_LOG_DEBUG, "MDCT initialized, order = %d.\n", yading@10: av_log2(mlt_size) + 1); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static av_cold void init_cplscales_table(COOKContext *q) yading@10: { yading@10: int i; yading@10: for (i = 0; i < 5; i++) yading@10: q->cplscales[i] = cplscales[i]; yading@10: } yading@10: yading@10: /*************** init functions end ***********/ yading@10: yading@10: #define DECODE_BYTES_PAD1(bytes) (3 - ((bytes) + 3) % 4) yading@10: #define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes))) yading@10: yading@10: /** yading@10: * Cook indata decoding, every 32 bits are XORed with 0x37c511f2. yading@10: * Why? No idea, some checksum/error detection method maybe. yading@10: * yading@10: * Out buffer size: extra bytes are needed to cope with yading@10: * padding/misalignment. yading@10: * Subpackets passed to the decoder can contain two, consecutive yading@10: * half-subpackets, of identical but arbitrary size. yading@10: * 1234 1234 1234 1234 extraA extraB yading@10: * Case 1: AAAA BBBB 0 0 yading@10: * Case 2: AAAA ABBB BB-- 3 3 yading@10: * Case 3: AAAA AABB BBBB 2 2 yading@10: * Case 4: AAAA AAAB BBBB BB-- 1 5 yading@10: * yading@10: * Nice way to waste CPU cycles. yading@10: * yading@10: * @param inbuffer pointer to byte array of indata yading@10: * @param out pointer to byte array of outdata yading@10: * @param bytes number of bytes yading@10: */ yading@10: static inline int decode_bytes(const uint8_t *inbuffer, uint8_t *out, int bytes) yading@10: { yading@10: static const uint32_t tab[4] = { yading@10: AV_BE2NE32C(0x37c511f2u), AV_BE2NE32C(0xf237c511u), yading@10: AV_BE2NE32C(0x11f237c5u), AV_BE2NE32C(0xc511f237u), yading@10: }; yading@10: int i, off; yading@10: uint32_t c; yading@10: const uint32_t *buf; yading@10: uint32_t *obuf = (uint32_t *) out; yading@10: /* FIXME: 64 bit platforms would be able to do 64 bits at a time. yading@10: * I'm too lazy though, should be something like yading@10: * for (i = 0; i < bitamount / 64; i++) yading@10: * (int64_t) out[i] = 0x37c511f237c511f2 ^ av_be2ne64(int64_t) in[i]); yading@10: * Buffer alignment needs to be checked. */ yading@10: yading@10: off = (intptr_t) inbuffer & 3; yading@10: buf = (const uint32_t *) (inbuffer - off); yading@10: c = tab[off]; yading@10: bytes += 3 + off; yading@10: for (i = 0; i < bytes / 4; i++) yading@10: obuf[i] = c ^ buf[i]; yading@10: yading@10: return off; yading@10: } yading@10: yading@10: static av_cold int cook_decode_close(AVCodecContext *avctx) yading@10: { yading@10: int i; yading@10: COOKContext *q = avctx->priv_data; yading@10: av_log(avctx, AV_LOG_DEBUG, "Deallocating memory.\n"); yading@10: yading@10: /* Free allocated memory buffers. */ yading@10: av_free(q->mlt_window); yading@10: av_free(q->decoded_bytes_buffer); yading@10: yading@10: /* Free the transform. */ yading@10: ff_mdct_end(&q->mdct_ctx); yading@10: yading@10: /* Free the VLC tables. */ yading@10: for (i = 0; i < 13; i++) yading@10: ff_free_vlc(&q->envelope_quant_index[i]); yading@10: for (i = 0; i < 7; i++) yading@10: ff_free_vlc(&q->sqvh[i]); yading@10: for (i = 0; i < q->num_subpackets; i++) yading@10: ff_free_vlc(&q->subpacket[i].channel_coupling); yading@10: yading@10: av_log(avctx, AV_LOG_DEBUG, "Memory deallocated.\n"); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: * Fill the gain array for the timedomain quantization. yading@10: * yading@10: * @param gb pointer to the GetBitContext yading@10: * @param gaininfo array[9] of gain indexes yading@10: */ yading@10: static void decode_gain_info(GetBitContext *gb, int *gaininfo) yading@10: { yading@10: int i, n; yading@10: yading@10: while (get_bits1(gb)) { yading@10: /* NOTHING */ yading@10: } yading@10: yading@10: n = get_bits_count(gb) - 1; // amount of elements*2 to update yading@10: yading@10: i = 0; yading@10: while (n--) { yading@10: int index = get_bits(gb, 3); yading@10: int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1; yading@10: yading@10: while (i <= index) yading@10: gaininfo[i++] = gain; yading@10: } yading@10: while (i <= 8) yading@10: gaininfo[i++] = 0; yading@10: } yading@10: yading@10: /** yading@10: * Create the quant index table needed for the envelope. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param quant_index_table pointer to the array yading@10: */ yading@10: static int decode_envelope(COOKContext *q, COOKSubpacket *p, yading@10: int *quant_index_table) yading@10: { yading@10: int i, j, vlc_index; yading@10: yading@10: quant_index_table[0] = get_bits(&q->gb, 6) - 6; // This is used later in categorize yading@10: yading@10: for (i = 1; i < p->total_subbands; i++) { yading@10: vlc_index = i; yading@10: if (i >= p->js_subband_start * 2) { yading@10: vlc_index -= p->js_subband_start; yading@10: } else { yading@10: vlc_index /= 2; yading@10: if (vlc_index < 1) yading@10: vlc_index = 1; yading@10: } yading@10: if (vlc_index > 13) yading@10: vlc_index = 13; // the VLC tables >13 are identical to No. 13 yading@10: yading@10: j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index - 1].table, yading@10: q->envelope_quant_index[vlc_index - 1].bits, 2); yading@10: quant_index_table[i] = quant_index_table[i - 1] + j - 12; // differential encoding yading@10: if (quant_index_table[i] > 63 || quant_index_table[i] < -63) { yading@10: av_log(q->avctx, AV_LOG_ERROR, yading@10: "Invalid quantizer %d at position %d, outside [-63, 63] range\n", yading@10: quant_index_table[i], i); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: * Calculate the category and category_index vector. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param quant_index_table pointer to the array yading@10: * @param category pointer to the category array yading@10: * @param category_index pointer to the category_index array yading@10: */ yading@10: static void categorize(COOKContext *q, COOKSubpacket *p, const int *quant_index_table, yading@10: int *category, int *category_index) yading@10: { yading@10: int exp_idx, bias, tmpbias1, tmpbias2, bits_left, num_bits, index, v, i, j; yading@10: int exp_index2[102] = { 0 }; yading@10: int exp_index1[102] = { 0 }; yading@10: yading@10: int tmp_categorize_array[128 * 2] = { 0 }; yading@10: int tmp_categorize_array1_idx = p->numvector_size; yading@10: int tmp_categorize_array2_idx = p->numvector_size; yading@10: yading@10: bits_left = p->bits_per_subpacket - get_bits_count(&q->gb); yading@10: yading@10: if (bits_left > q->samples_per_channel) yading@10: bits_left = q->samples_per_channel + yading@10: ((bits_left - q->samples_per_channel) * 5) / 8; yading@10: yading@10: bias = -32; yading@10: yading@10: /* Estimate bias. */ yading@10: for (i = 32; i > 0; i = i / 2) { yading@10: num_bits = 0; yading@10: index = 0; yading@10: for (j = p->total_subbands; j > 0; j--) { yading@10: exp_idx = av_clip((i - quant_index_table[index] + bias) / 2, 0, 7); yading@10: index++; yading@10: num_bits += expbits_tab[exp_idx]; yading@10: } yading@10: if (num_bits >= bits_left - 32) yading@10: bias += i; yading@10: } yading@10: yading@10: /* Calculate total number of bits. */ yading@10: num_bits = 0; yading@10: for (i = 0; i < p->total_subbands; i++) { yading@10: exp_idx = av_clip((bias - quant_index_table[i]) / 2, 0, 7); yading@10: num_bits += expbits_tab[exp_idx]; yading@10: exp_index1[i] = exp_idx; yading@10: exp_index2[i] = exp_idx; yading@10: } yading@10: tmpbias1 = tmpbias2 = num_bits; yading@10: yading@10: for (j = 1; j < p->numvector_size; j++) { yading@10: if (tmpbias1 + tmpbias2 > 2 * bits_left) { /* ---> */ yading@10: int max = -999999; yading@10: index = -1; yading@10: for (i = 0; i < p->total_subbands; i++) { yading@10: if (exp_index1[i] < 7) { yading@10: v = (-2 * exp_index1[i]) - quant_index_table[i] + bias; yading@10: if (v >= max) { yading@10: max = v; yading@10: index = i; yading@10: } yading@10: } yading@10: } yading@10: if (index == -1) yading@10: break; yading@10: tmp_categorize_array[tmp_categorize_array1_idx++] = index; yading@10: tmpbias1 -= expbits_tab[exp_index1[index]] - yading@10: expbits_tab[exp_index1[index] + 1]; yading@10: ++exp_index1[index]; yading@10: } else { /* <--- */ yading@10: int min = 999999; yading@10: index = -1; yading@10: for (i = 0; i < p->total_subbands; i++) { yading@10: if (exp_index2[i] > 0) { yading@10: v = (-2 * exp_index2[i]) - quant_index_table[i] + bias; yading@10: if (v < min) { yading@10: min = v; yading@10: index = i; yading@10: } yading@10: } yading@10: } yading@10: if (index == -1) yading@10: break; yading@10: tmp_categorize_array[--tmp_categorize_array2_idx] = index; yading@10: tmpbias2 -= expbits_tab[exp_index2[index]] - yading@10: expbits_tab[exp_index2[index] - 1]; yading@10: --exp_index2[index]; yading@10: } yading@10: } yading@10: yading@10: for (i = 0; i < p->total_subbands; i++) yading@10: category[i] = exp_index2[i]; yading@10: yading@10: for (i = 0; i < p->numvector_size - 1; i++) yading@10: category_index[i] = tmp_categorize_array[tmp_categorize_array2_idx++]; yading@10: } yading@10: yading@10: yading@10: /** yading@10: * Expand the category vector. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param category pointer to the category array yading@10: * @param category_index pointer to the category_index array yading@10: */ yading@10: static inline void expand_category(COOKContext *q, int *category, yading@10: int *category_index) yading@10: { yading@10: int i; yading@10: for (i = 0; i < q->num_vectors; i++) yading@10: { yading@10: int idx = category_index[i]; yading@10: if (++category[idx] >= FF_ARRAY_ELEMS(dither_tab)) yading@10: --category[idx]; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * The real requantization of the mltcoefs yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param index index yading@10: * @param quant_index quantisation index yading@10: * @param subband_coef_index array of indexes to quant_centroid_tab yading@10: * @param subband_coef_sign signs of coefficients yading@10: * @param mlt_p pointer into the mlt buffer yading@10: */ yading@10: static void scalar_dequant_float(COOKContext *q, int index, int quant_index, yading@10: int *subband_coef_index, int *subband_coef_sign, yading@10: float *mlt_p) yading@10: { yading@10: int i; yading@10: float f1; yading@10: yading@10: for (i = 0; i < SUBBAND_SIZE; i++) { yading@10: if (subband_coef_index[i]) { yading@10: f1 = quant_centroid_tab[index][subband_coef_index[i]]; yading@10: if (subband_coef_sign[i]) yading@10: f1 = -f1; yading@10: } else { yading@10: /* noise coding if subband_coef_index[i] == 0 */ yading@10: f1 = dither_tab[index]; yading@10: if (av_lfg_get(&q->random_state) < 0x80000000) yading@10: f1 = -f1; yading@10: } yading@10: mlt_p[i] = f1 * rootpow2tab[quant_index + 63]; yading@10: } yading@10: } yading@10: /** yading@10: * Unpack the subband_coef_index and subband_coef_sign vectors. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param category pointer to the category array yading@10: * @param subband_coef_index array of indexes to quant_centroid_tab yading@10: * @param subband_coef_sign signs of coefficients yading@10: */ yading@10: static int unpack_SQVH(COOKContext *q, COOKSubpacket *p, int category, yading@10: int *subband_coef_index, int *subband_coef_sign) yading@10: { yading@10: int i, j; yading@10: int vlc, vd, tmp, result; yading@10: yading@10: vd = vd_tab[category]; yading@10: result = 0; yading@10: for (i = 0; i < vpr_tab[category]; i++) { yading@10: vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3); yading@10: if (p->bits_per_subpacket < get_bits_count(&q->gb)) { yading@10: vlc = 0; yading@10: result = 1; yading@10: } yading@10: for (j = vd - 1; j >= 0; j--) { yading@10: tmp = (vlc * invradix_tab[category]) / 0x100000; yading@10: subband_coef_index[vd * i + j] = vlc - tmp * (kmax_tab[category] + 1); yading@10: vlc = tmp; yading@10: } yading@10: for (j = 0; j < vd; j++) { yading@10: if (subband_coef_index[i * vd + j]) { yading@10: if (get_bits_count(&q->gb) < p->bits_per_subpacket) { yading@10: subband_coef_sign[i * vd + j] = get_bits1(&q->gb); yading@10: } else { yading@10: result = 1; yading@10: subband_coef_sign[i * vd + j] = 0; yading@10: } yading@10: } else { yading@10: subband_coef_sign[i * vd + j] = 0; yading@10: } yading@10: } yading@10: } yading@10: return result; yading@10: } yading@10: yading@10: yading@10: /** yading@10: * Fill the mlt_buffer with mlt coefficients. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param category pointer to the category array yading@10: * @param quant_index_table pointer to the array yading@10: * @param mlt_buffer pointer to mlt coefficients yading@10: */ yading@10: static void decode_vectors(COOKContext *q, COOKSubpacket *p, int *category, yading@10: int *quant_index_table, float *mlt_buffer) yading@10: { yading@10: /* A zero in this table means that the subband coefficient is yading@10: random noise coded. */ yading@10: int subband_coef_index[SUBBAND_SIZE]; yading@10: /* A zero in this table means that the subband coefficient is a yading@10: positive multiplicator. */ yading@10: int subband_coef_sign[SUBBAND_SIZE]; yading@10: int band, j; yading@10: int index = 0; yading@10: yading@10: for (band = 0; band < p->total_subbands; band++) { yading@10: index = category[band]; yading@10: if (category[band] < 7) { yading@10: if (unpack_SQVH(q, p, category[band], subband_coef_index, subband_coef_sign)) { yading@10: index = 7; yading@10: for (j = 0; j < p->total_subbands; j++) yading@10: category[band + j] = 7; yading@10: } yading@10: } yading@10: if (index >= 7) { yading@10: memset(subband_coef_index, 0, sizeof(subband_coef_index)); yading@10: memset(subband_coef_sign, 0, sizeof(subband_coef_sign)); yading@10: } yading@10: q->scalar_dequant(q, index, quant_index_table[band], yading@10: subband_coef_index, subband_coef_sign, yading@10: &mlt_buffer[band * SUBBAND_SIZE]); yading@10: } yading@10: yading@10: /* FIXME: should this be removed, or moved into loop above? */ yading@10: if (p->total_subbands * SUBBAND_SIZE >= q->samples_per_channel) yading@10: return; yading@10: } yading@10: yading@10: yading@10: static int mono_decode(COOKContext *q, COOKSubpacket *p, float *mlt_buffer) yading@10: { yading@10: int category_index[128] = { 0 }; yading@10: int category[128] = { 0 }; yading@10: int quant_index_table[102]; yading@10: int res, i; yading@10: yading@10: if ((res = decode_envelope(q, p, quant_index_table)) < 0) yading@10: return res; yading@10: q->num_vectors = get_bits(&q->gb, p->log2_numvector_size); yading@10: categorize(q, p, quant_index_table, category, category_index); yading@10: expand_category(q, category, category_index); yading@10: for (i=0; itotal_subbands; i++) { yading@10: if (category[i] > 7) yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: decode_vectors(q, p, category, quant_index_table, mlt_buffer); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: /** yading@10: * the actual requantization of the timedomain samples yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param buffer pointer to the timedomain buffer yading@10: * @param gain_index index for the block multiplier yading@10: * @param gain_index_next index for the next block multiplier yading@10: */ yading@10: static void interpolate_float(COOKContext *q, float *buffer, yading@10: int gain_index, int gain_index_next) yading@10: { yading@10: int i; yading@10: float fc1, fc2; yading@10: fc1 = pow2tab[gain_index + 63]; yading@10: yading@10: if (gain_index == gain_index_next) { // static gain yading@10: for (i = 0; i < q->gain_size_factor; i++) yading@10: buffer[i] *= fc1; yading@10: } else { // smooth gain yading@10: fc2 = q->gain_table[11 + (gain_index_next - gain_index)]; yading@10: for (i = 0; i < q->gain_size_factor; i++) { yading@10: buffer[i] *= fc1; yading@10: fc1 *= fc2; yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Apply transform window, overlap buffers. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param inbuffer pointer to the mltcoefficients yading@10: * @param gains_ptr current and previous gains yading@10: * @param previous_buffer pointer to the previous buffer to be used for overlapping yading@10: */ yading@10: static void imlt_window_float(COOKContext *q, float *inbuffer, yading@10: cook_gains *gains_ptr, float *previous_buffer) yading@10: { yading@10: const float fc = pow2tab[gains_ptr->previous[0] + 63]; yading@10: int i; yading@10: /* The weird thing here, is that the two halves of the time domain yading@10: * buffer are swapped. Also, the newest data, that we save away for yading@10: * next frame, has the wrong sign. Hence the subtraction below. yading@10: * Almost sounds like a complex conjugate/reverse data/FFT effect. yading@10: */ yading@10: yading@10: /* Apply window and overlap */ yading@10: for (i = 0; i < q->samples_per_channel; i++) yading@10: inbuffer[i] = inbuffer[i] * fc * q->mlt_window[i] - yading@10: previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i]; yading@10: } yading@10: yading@10: /** yading@10: * The modulated lapped transform, this takes transform coefficients yading@10: * and transforms them into timedomain samples. yading@10: * Apply transform window, overlap buffers, apply gain profile yading@10: * and buffer management. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param inbuffer pointer to the mltcoefficients yading@10: * @param gains_ptr current and previous gains yading@10: * @param previous_buffer pointer to the previous buffer to be used for overlapping yading@10: */ yading@10: static void imlt_gain(COOKContext *q, float *inbuffer, yading@10: cook_gains *gains_ptr, float *previous_buffer) yading@10: { yading@10: float *buffer0 = q->mono_mdct_output; yading@10: float *buffer1 = q->mono_mdct_output + q->samples_per_channel; yading@10: int i; yading@10: yading@10: /* Inverse modified discrete cosine transform */ yading@10: q->mdct_ctx.imdct_calc(&q->mdct_ctx, q->mono_mdct_output, inbuffer); yading@10: yading@10: q->imlt_window(q, buffer1, gains_ptr, previous_buffer); yading@10: yading@10: /* Apply gain profile */ yading@10: for (i = 0; i < 8; i++) yading@10: if (gains_ptr->now[i] || gains_ptr->now[i + 1]) yading@10: q->interpolate(q, &buffer1[q->gain_size_factor * i], yading@10: gains_ptr->now[i], gains_ptr->now[i + 1]); yading@10: yading@10: /* Save away the current to be previous block. */ yading@10: memcpy(previous_buffer, buffer0, yading@10: q->samples_per_channel * sizeof(*previous_buffer)); yading@10: } yading@10: yading@10: yading@10: /** yading@10: * function for getting the jointstereo coupling information yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param decouple_tab decoupling array yading@10: */ yading@10: static int decouple_info(COOKContext *q, COOKSubpacket *p, int *decouple_tab) yading@10: { yading@10: int i; yading@10: int vlc = get_bits1(&q->gb); yading@10: int start = cplband[p->js_subband_start]; yading@10: int end = cplband[p->subbands - 1]; yading@10: int length = end - start + 1; yading@10: yading@10: if (start > end) yading@10: return 0; yading@10: yading@10: if (vlc) yading@10: for (i = 0; i < length; i++) yading@10: decouple_tab[start + i] = get_vlc2(&q->gb, yading@10: p->channel_coupling.table, yading@10: p->channel_coupling.bits, 2); yading@10: else yading@10: for (i = 0; i < length; i++) { yading@10: int v = get_bits(&q->gb, p->js_vlc_bits); yading@10: if (v == (1<js_vlc_bits)-1) { yading@10: av_log(q->avctx, AV_LOG_ERROR, "decouple value too large\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: decouple_tab[start + i] = v; yading@10: } yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: * function decouples a pair of signals from a single signal via multiplication. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param subband index of the current subband yading@10: * @param f1 multiplier for channel 1 extraction yading@10: * @param f2 multiplier for channel 2 extraction yading@10: * @param decode_buffer input buffer yading@10: * @param mlt_buffer1 pointer to left channel mlt coefficients yading@10: * @param mlt_buffer2 pointer to right channel mlt coefficients yading@10: */ yading@10: static void decouple_float(COOKContext *q, yading@10: COOKSubpacket *p, yading@10: int subband, yading@10: float f1, float f2, yading@10: float *decode_buffer, yading@10: float *mlt_buffer1, float *mlt_buffer2) yading@10: { yading@10: int j, tmp_idx; yading@10: for (j = 0; j < SUBBAND_SIZE; j++) { yading@10: tmp_idx = ((p->js_subband_start + subband) * SUBBAND_SIZE) + j; yading@10: mlt_buffer1[SUBBAND_SIZE * subband + j] = f1 * decode_buffer[tmp_idx]; yading@10: mlt_buffer2[SUBBAND_SIZE * subband + j] = f2 * decode_buffer[tmp_idx]; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * function for decoding joint stereo data yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param mlt_buffer1 pointer to left channel mlt coefficients yading@10: * @param mlt_buffer2 pointer to right channel mlt coefficients yading@10: */ yading@10: static int joint_decode(COOKContext *q, COOKSubpacket *p, yading@10: float *mlt_buffer_left, float *mlt_buffer_right) yading@10: { yading@10: int i, j, res; yading@10: int decouple_tab[SUBBAND_SIZE] = { 0 }; yading@10: float *decode_buffer = q->decode_buffer_0; yading@10: int idx, cpl_tmp; yading@10: float f1, f2; yading@10: const float *cplscale; yading@10: yading@10: memset(decode_buffer, 0, sizeof(q->decode_buffer_0)); yading@10: yading@10: /* Make sure the buffers are zeroed out. */ yading@10: memset(mlt_buffer_left, 0, 1024 * sizeof(*mlt_buffer_left)); yading@10: memset(mlt_buffer_right, 0, 1024 * sizeof(*mlt_buffer_right)); yading@10: if ((res = decouple_info(q, p, decouple_tab)) < 0) yading@10: return res; yading@10: if ((res = mono_decode(q, p, decode_buffer)) < 0) yading@10: return res; yading@10: /* The two channels are stored interleaved in decode_buffer. */ yading@10: for (i = 0; i < p->js_subband_start; i++) { yading@10: for (j = 0; j < SUBBAND_SIZE; j++) { yading@10: mlt_buffer_left[i * 20 + j] = decode_buffer[i * 40 + j]; yading@10: mlt_buffer_right[i * 20 + j] = decode_buffer[i * 40 + 20 + j]; yading@10: } yading@10: } yading@10: yading@10: /* When we reach js_subband_start (the higher frequencies) yading@10: the coefficients are stored in a coupling scheme. */ yading@10: idx = (1 << p->js_vlc_bits) - 1; yading@10: for (i = p->js_subband_start; i < p->subbands; i++) { yading@10: cpl_tmp = cplband[i]; yading@10: idx -= decouple_tab[cpl_tmp]; yading@10: cplscale = q->cplscales[p->js_vlc_bits - 2]; // choose decoupler table yading@10: f1 = cplscale[decouple_tab[cpl_tmp] + 1]; yading@10: f2 = cplscale[idx]; yading@10: q->decouple(q, p, i, f1, f2, decode_buffer, yading@10: mlt_buffer_left, mlt_buffer_right); yading@10: idx = (1 << p->js_vlc_bits) - 1; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: * First part of subpacket decoding: yading@10: * decode raw stream bytes and read gain info. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param inbuffer pointer to raw stream data yading@10: * @param gains_ptr array of current/prev gain pointers yading@10: */ yading@10: static inline void decode_bytes_and_gain(COOKContext *q, COOKSubpacket *p, yading@10: const uint8_t *inbuffer, yading@10: cook_gains *gains_ptr) yading@10: { yading@10: int offset; yading@10: yading@10: offset = decode_bytes(inbuffer, q->decoded_bytes_buffer, yading@10: p->bits_per_subpacket / 8); yading@10: init_get_bits(&q->gb, q->decoded_bytes_buffer + offset, yading@10: p->bits_per_subpacket); yading@10: decode_gain_info(&q->gb, gains_ptr->now); yading@10: yading@10: /* Swap current and previous gains */ yading@10: FFSWAP(int *, gains_ptr->now, gains_ptr->previous); yading@10: } yading@10: yading@10: /** yading@10: * Saturate the output signal and interleave. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param out pointer to the output vector yading@10: */ yading@10: static void saturate_output_float(COOKContext *q, float *out) yading@10: { yading@10: q->dsp.vector_clipf(out, q->mono_mdct_output + q->samples_per_channel, yading@10: -1.0f, 1.0f, FFALIGN(q->samples_per_channel, 8)); yading@10: } yading@10: yading@10: yading@10: /** yading@10: * Final part of subpacket decoding: yading@10: * Apply modulated lapped transform, gain compensation, yading@10: * clip and convert to integer. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param decode_buffer pointer to the mlt coefficients yading@10: * @param gains_ptr array of current/prev gain pointers yading@10: * @param previous_buffer pointer to the previous buffer to be used for overlapping yading@10: * @param out pointer to the output buffer yading@10: */ yading@10: static inline void mlt_compensate_output(COOKContext *q, float *decode_buffer, yading@10: cook_gains *gains_ptr, float *previous_buffer, yading@10: float *out) yading@10: { yading@10: imlt_gain(q, decode_buffer, gains_ptr, previous_buffer); yading@10: if (out) yading@10: q->saturate_output(q, out); yading@10: } yading@10: yading@10: yading@10: /** yading@10: * Cook subpacket decoding. This function returns one decoded subpacket, yading@10: * usually 1024 samples per channel. yading@10: * yading@10: * @param q pointer to the COOKContext yading@10: * @param inbuffer pointer to the inbuffer yading@10: * @param outbuffer pointer to the outbuffer yading@10: */ yading@10: static int decode_subpacket(COOKContext *q, COOKSubpacket *p, yading@10: const uint8_t *inbuffer, float **outbuffer) yading@10: { yading@10: int sub_packet_size = p->size; yading@10: int res; yading@10: yading@10: memset(q->decode_buffer_1, 0, sizeof(q->decode_buffer_1)); yading@10: decode_bytes_and_gain(q, p, inbuffer, &p->gains1); yading@10: yading@10: if (p->joint_stereo) { yading@10: if ((res = joint_decode(q, p, q->decode_buffer_1, q->decode_buffer_2)) < 0) yading@10: return res; yading@10: } else { yading@10: if ((res = mono_decode(q, p, q->decode_buffer_1)) < 0) yading@10: return res; yading@10: yading@10: if (p->num_channels == 2) { yading@10: decode_bytes_and_gain(q, p, inbuffer + sub_packet_size / 2, &p->gains2); yading@10: if ((res = mono_decode(q, p, q->decode_buffer_2)) < 0) yading@10: return res; yading@10: } yading@10: } yading@10: yading@10: mlt_compensate_output(q, q->decode_buffer_1, &p->gains1, yading@10: p->mono_previous_buffer1, yading@10: outbuffer ? outbuffer[p->ch_idx] : NULL); yading@10: yading@10: if (p->num_channels == 2) { yading@10: if (p->joint_stereo) yading@10: mlt_compensate_output(q, q->decode_buffer_2, &p->gains1, yading@10: p->mono_previous_buffer2, yading@10: outbuffer ? outbuffer[p->ch_idx + 1] : NULL); yading@10: else yading@10: mlt_compensate_output(q, q->decode_buffer_2, &p->gains2, yading@10: p->mono_previous_buffer2, yading@10: outbuffer ? outbuffer[p->ch_idx + 1] : NULL); yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: static int cook_decode_frame(AVCodecContext *avctx, void *data, yading@10: int *got_frame_ptr, AVPacket *avpkt) yading@10: { yading@10: AVFrame *frame = data; yading@10: const uint8_t *buf = avpkt->data; yading@10: int buf_size = avpkt->size; yading@10: COOKContext *q = avctx->priv_data; yading@10: float **samples = NULL; yading@10: int i, ret; yading@10: int offset = 0; yading@10: int chidx = 0; yading@10: yading@10: if (buf_size < avctx->block_align) yading@10: return buf_size; yading@10: yading@10: /* get output buffer */ yading@10: if (q->discarded_packets >= 2) { yading@10: frame->nb_samples = q->samples_per_channel; yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return ret; yading@10: samples = (float **)frame->extended_data; yading@10: } yading@10: yading@10: /* estimate subpacket sizes */ yading@10: q->subpacket[0].size = avctx->block_align; yading@10: yading@10: for (i = 1; i < q->num_subpackets; i++) { yading@10: q->subpacket[i].size = 2 * buf[avctx->block_align - q->num_subpackets + i]; yading@10: q->subpacket[0].size -= q->subpacket[i].size + 1; yading@10: if (q->subpacket[0].size < 0) { yading@10: av_log(avctx, AV_LOG_DEBUG, yading@10: "frame subpacket size total > avctx->block_align!\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: } yading@10: yading@10: /* decode supbackets */ yading@10: for (i = 0; i < q->num_subpackets; i++) { yading@10: q->subpacket[i].bits_per_subpacket = (q->subpacket[i].size * 8) >> yading@10: q->subpacket[i].bits_per_subpdiv; yading@10: q->subpacket[i].ch_idx = chidx; yading@10: av_log(avctx, AV_LOG_DEBUG, yading@10: "subpacket[%i] size %i js %i %i block_align %i\n", yading@10: i, q->subpacket[i].size, q->subpacket[i].joint_stereo, offset, yading@10: avctx->block_align); yading@10: yading@10: if ((ret = decode_subpacket(q, &q->subpacket[i], buf + offset, samples)) < 0) yading@10: return ret; yading@10: offset += q->subpacket[i].size; yading@10: chidx += q->subpacket[i].num_channels; yading@10: av_log(avctx, AV_LOG_DEBUG, "subpacket[%i] %i %i\n", yading@10: i, q->subpacket[i].size * 8, get_bits_count(&q->gb)); yading@10: } yading@10: yading@10: /* Discard the first two frames: no valid audio. */ yading@10: if (q->discarded_packets < 2) { yading@10: q->discarded_packets++; yading@10: *got_frame_ptr = 0; yading@10: return avctx->block_align; yading@10: } yading@10: yading@10: *got_frame_ptr = 1; yading@10: yading@10: return avctx->block_align; yading@10: } yading@10: yading@10: #ifdef DEBUG yading@10: static void dump_cook_context(COOKContext *q) yading@10: { yading@10: //int i=0; yading@10: #define PRINT(a, b) av_dlog(q->avctx, " %s = %d\n", a, b); yading@10: av_dlog(q->avctx, "COOKextradata\n"); yading@10: av_dlog(q->avctx, "cookversion=%x\n", q->subpacket[0].cookversion); yading@10: if (q->subpacket[0].cookversion > STEREO) { yading@10: PRINT("js_subband_start", q->subpacket[0].js_subband_start); yading@10: PRINT("js_vlc_bits", q->subpacket[0].js_vlc_bits); yading@10: } yading@10: av_dlog(q->avctx, "COOKContext\n"); yading@10: PRINT("nb_channels", q->avctx->channels); yading@10: PRINT("bit_rate", q->avctx->bit_rate); yading@10: PRINT("sample_rate", q->avctx->sample_rate); yading@10: PRINT("samples_per_channel", q->subpacket[0].samples_per_channel); yading@10: PRINT("subbands", q->subpacket[0].subbands); yading@10: PRINT("js_subband_start", q->subpacket[0].js_subband_start); yading@10: PRINT("log2_numvector_size", q->subpacket[0].log2_numvector_size); yading@10: PRINT("numvector_size", q->subpacket[0].numvector_size); yading@10: PRINT("total_subbands", q->subpacket[0].total_subbands); yading@10: } yading@10: #endif yading@10: yading@10: /** yading@10: * Cook initialization yading@10: * yading@10: * @param avctx pointer to the AVCodecContext yading@10: */ yading@10: static av_cold int cook_decode_init(AVCodecContext *avctx) yading@10: { yading@10: COOKContext *q = avctx->priv_data; yading@10: const uint8_t *edata_ptr = avctx->extradata; yading@10: const uint8_t *edata_ptr_end = edata_ptr + avctx->extradata_size; yading@10: int extradata_size = avctx->extradata_size; yading@10: int s = 0; yading@10: unsigned int channel_mask = 0; yading@10: int samples_per_frame = 0; yading@10: int ret; yading@10: q->avctx = avctx; yading@10: yading@10: /* Take care of the codec specific extradata. */ yading@10: if (extradata_size <= 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "Necessary extradata missing!\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: av_log(avctx, AV_LOG_DEBUG, "codecdata_length=%d\n", avctx->extradata_size); yading@10: yading@10: /* Take data from the AVCodecContext (RM container). */ yading@10: if (!avctx->channels) { yading@10: av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: /* Initialize RNG. */ yading@10: av_lfg_init(&q->random_state, 0); yading@10: yading@10: ff_dsputil_init(&q->dsp, avctx); yading@10: yading@10: while (edata_ptr < edata_ptr_end) { yading@10: /* 8 for mono, 16 for stereo, ? for multichannel yading@10: Swap to right endianness so we don't need to care later on. */ yading@10: if (extradata_size >= 8) { yading@10: q->subpacket[s].cookversion = bytestream_get_be32(&edata_ptr); yading@10: samples_per_frame = bytestream_get_be16(&edata_ptr); yading@10: q->subpacket[s].subbands = bytestream_get_be16(&edata_ptr); yading@10: extradata_size -= 8; yading@10: } yading@10: if (extradata_size >= 8) { yading@10: bytestream_get_be32(&edata_ptr); // Unknown unused yading@10: q->subpacket[s].js_subband_start = bytestream_get_be16(&edata_ptr); yading@10: if (q->subpacket[s].js_subband_start >= 51) { yading@10: av_log(avctx, AV_LOG_ERROR, "js_subband_start %d is too large\n", q->subpacket[s].js_subband_start); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: q->subpacket[s].js_vlc_bits = bytestream_get_be16(&edata_ptr); yading@10: extradata_size -= 8; yading@10: } yading@10: yading@10: /* Initialize extradata related variables. */ yading@10: q->subpacket[s].samples_per_channel = samples_per_frame / avctx->channels; yading@10: q->subpacket[s].bits_per_subpacket = avctx->block_align * 8; yading@10: yading@10: /* Initialize default data states. */ yading@10: q->subpacket[s].log2_numvector_size = 5; yading@10: q->subpacket[s].total_subbands = q->subpacket[s].subbands; yading@10: q->subpacket[s].num_channels = 1; yading@10: yading@10: /* Initialize version-dependent variables */ yading@10: yading@10: av_log(avctx, AV_LOG_DEBUG, "subpacket[%i].cookversion=%x\n", s, yading@10: q->subpacket[s].cookversion); yading@10: q->subpacket[s].joint_stereo = 0; yading@10: switch (q->subpacket[s].cookversion) { yading@10: case MONO: yading@10: if (avctx->channels != 1) { yading@10: avpriv_request_sample(avctx, "Container channels != 1"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: av_log(avctx, AV_LOG_DEBUG, "MONO\n"); yading@10: break; yading@10: case STEREO: yading@10: if (avctx->channels != 1) { yading@10: q->subpacket[s].bits_per_subpdiv = 1; yading@10: q->subpacket[s].num_channels = 2; yading@10: } yading@10: av_log(avctx, AV_LOG_DEBUG, "STEREO\n"); yading@10: break; yading@10: case JOINT_STEREO: yading@10: if (avctx->channels != 2) { yading@10: avpriv_request_sample(avctx, "Container channels != 2"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: av_log(avctx, AV_LOG_DEBUG, "JOINT_STEREO\n"); yading@10: if (avctx->extradata_size >= 16) { yading@10: q->subpacket[s].total_subbands = q->subpacket[s].subbands + yading@10: q->subpacket[s].js_subband_start; yading@10: q->subpacket[s].joint_stereo = 1; yading@10: q->subpacket[s].num_channels = 2; yading@10: } yading@10: if (q->subpacket[s].samples_per_channel > 256) { yading@10: q->subpacket[s].log2_numvector_size = 6; yading@10: } yading@10: if (q->subpacket[s].samples_per_channel > 512) { yading@10: q->subpacket[s].log2_numvector_size = 7; yading@10: } yading@10: break; yading@10: case MC_COOK: yading@10: av_log(avctx, AV_LOG_DEBUG, "MULTI_CHANNEL\n"); yading@10: if (extradata_size >= 4) yading@10: channel_mask |= q->subpacket[s].channel_mask = bytestream_get_be32(&edata_ptr); yading@10: yading@10: if (av_get_channel_layout_nb_channels(q->subpacket[s].channel_mask) > 1) { yading@10: q->subpacket[s].total_subbands = q->subpacket[s].subbands + yading@10: q->subpacket[s].js_subband_start; yading@10: q->subpacket[s].joint_stereo = 1; yading@10: q->subpacket[s].num_channels = 2; yading@10: q->subpacket[s].samples_per_channel = samples_per_frame >> 1; yading@10: yading@10: if (q->subpacket[s].samples_per_channel > 256) { yading@10: q->subpacket[s].log2_numvector_size = 6; yading@10: } yading@10: if (q->subpacket[s].samples_per_channel > 512) { yading@10: q->subpacket[s].log2_numvector_size = 7; yading@10: } yading@10: } else yading@10: q->subpacket[s].samples_per_channel = samples_per_frame; yading@10: yading@10: break; yading@10: default: yading@10: avpriv_request_sample(avctx, "Cook version %d", yading@10: q->subpacket[s].cookversion); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: if (s > 1 && q->subpacket[s].samples_per_channel != q->samples_per_channel) { yading@10: av_log(avctx, AV_LOG_ERROR, "different number of samples per channel!\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } else yading@10: q->samples_per_channel = q->subpacket[0].samples_per_channel; yading@10: yading@10: yading@10: /* Initialize variable relations */ yading@10: q->subpacket[s].numvector_size = (1 << q->subpacket[s].log2_numvector_size); yading@10: yading@10: /* Try to catch some obviously faulty streams, othervise it might be exploitable */ yading@10: if (q->subpacket[s].total_subbands > 53) { yading@10: avpriv_request_sample(avctx, "total_subbands > 53"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: if ((q->subpacket[s].js_vlc_bits > 6) || yading@10: (q->subpacket[s].js_vlc_bits < 2 * q->subpacket[s].joint_stereo)) { yading@10: av_log(avctx, AV_LOG_ERROR, "js_vlc_bits = %d, only >= %d and <= 6 allowed!\n", yading@10: q->subpacket[s].js_vlc_bits, 2 * q->subpacket[s].joint_stereo); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (q->subpacket[s].subbands > 50) { yading@10: avpriv_request_sample(avctx, "subbands > 50"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: if (q->subpacket[s].subbands == 0) { yading@10: avpriv_request_sample(avctx, "subbands = 0"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: q->subpacket[s].gains1.now = q->subpacket[s].gain_1; yading@10: q->subpacket[s].gains1.previous = q->subpacket[s].gain_2; yading@10: q->subpacket[s].gains2.now = q->subpacket[s].gain_3; yading@10: q->subpacket[s].gains2.previous = q->subpacket[s].gain_4; yading@10: yading@10: if (q->num_subpackets + q->subpacket[s].num_channels > q->avctx->channels) { yading@10: av_log(avctx, AV_LOG_ERROR, "Too many subpackets %d for channels %d\n", q->num_subpackets, q->avctx->channels); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: q->num_subpackets++; yading@10: s++; yading@10: if (s > MAX_SUBPACKETS) { yading@10: avpriv_request_sample(avctx, "subpackets > %d", MAX_SUBPACKETS); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: } yading@10: /* Generate tables */ yading@10: init_pow2table(); yading@10: init_gain_table(q); yading@10: init_cplscales_table(q); yading@10: yading@10: if ((ret = init_cook_vlc_tables(q))) yading@10: return ret; yading@10: yading@10: yading@10: if (avctx->block_align >= UINT_MAX / 2) yading@10: return AVERROR(EINVAL); yading@10: yading@10: /* Pad the databuffer with: yading@10: DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(), yading@10: FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */ yading@10: q->decoded_bytes_buffer = yading@10: av_mallocz(avctx->block_align yading@10: + DECODE_BYTES_PAD1(avctx->block_align) yading@10: + FF_INPUT_BUFFER_PADDING_SIZE); yading@10: if (q->decoded_bytes_buffer == NULL) yading@10: return AVERROR(ENOMEM); yading@10: yading@10: /* Initialize transform. */ yading@10: if ((ret = init_cook_mlt(q))) yading@10: return ret; yading@10: yading@10: /* Initialize COOK signal arithmetic handling */ yading@10: if (1) { yading@10: q->scalar_dequant = scalar_dequant_float; yading@10: q->decouple = decouple_float; yading@10: q->imlt_window = imlt_window_float; yading@10: q->interpolate = interpolate_float; yading@10: q->saturate_output = saturate_output_float; yading@10: } yading@10: yading@10: /* Try to catch some obviously faulty streams, othervise it might be exploitable */ yading@10: if (q->samples_per_channel != 256 && q->samples_per_channel != 512 && yading@10: q->samples_per_channel != 1024) { yading@10: avpriv_request_sample(avctx, "samples_per_channel = %d", yading@10: q->samples_per_channel); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; yading@10: if (channel_mask) yading@10: avctx->channel_layout = channel_mask; yading@10: else yading@10: avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; yading@10: yading@10: #ifdef DEBUG yading@10: dump_cook_context(q); yading@10: #endif yading@10: return 0; yading@10: } yading@10: yading@10: AVCodec ff_cook_decoder = { yading@10: .name = "cook", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_COOK, yading@10: .priv_data_size = sizeof(COOKContext), yading@10: .init = cook_decode_init, yading@10: .close = cook_decode_close, yading@10: .decode = cook_decode_frame, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("Cook / Cooker / Gecko (RealAudio G2)"), yading@10: .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, yading@10: AV_SAMPLE_FMT_NONE }, yading@10: };