diff options
Diffstat (limited to 'ffmpeg/libavcodec/cook.c')
| -rw-r--r-- | ffmpeg/libavcodec/cook.c | 1289 |
1 files changed, 0 insertions, 1289 deletions
diff --git a/ffmpeg/libavcodec/cook.c b/ffmpeg/libavcodec/cook.c deleted file mode 100644 index 402093c..0000000 --- a/ffmpeg/libavcodec/cook.c +++ /dev/null @@ -1,1289 +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 compatible decoder. Bastardization of the G.722.1 standard. - * 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 "libavutil/channel_layout.h" -#include "libavutil/lfg.h" -#include "avcodec.h" -#include "get_bits.h" -#include "dsputil.h" -#include "bytestream.h" -#include "fft.h" -#include "internal.h" -#include "sinewin.h" -#include "unary.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 MAX_SUBPACKETS 5 - -typedef struct { - int *now; - int *previous; -} cook_gains; - -typedef struct { - int ch_idx; - int size; - int num_channels; - int cookversion; - int subbands; - int js_subband_start; - int js_vlc_bits; - int samples_per_channel; - int log2_numvector_size; - unsigned int channel_mask; - VLC channel_coupling; - int joint_stereo; - int bits_per_subpacket; - int bits_per_subpdiv; - int total_subbands; - int numvector_size; // 1 << log2_numvector_size; - - float mono_previous_buffer1[1024]; - float mono_previous_buffer2[1024]; - - cook_gains gains1; - cook_gains gains2; - int gain_1[9]; - int gain_2[9]; - int gain_3[9]; - int gain_4[9]; -} COOKSubpacket; - -typedef struct cook { - /* - * The following 5 functions provide the lowlevel arithmetic on - * the internal audio buffers. - */ - void (*scalar_dequant)(struct cook *q, int index, int quant_index, - int *subband_coef_index, int *subband_coef_sign, - float *mlt_p); - - void (*decouple)(struct cook *q, - COOKSubpacket *p, - int subband, - float f1, float f2, - float *decode_buffer, - float *mlt_buffer1, float *mlt_buffer2); - - void (*imlt_window)(struct cook *q, float *buffer1, - cook_gains *gains_ptr, float *previous_buffer); - - void (*interpolate)(struct cook *q, float *buffer, - int gain_index, int gain_index_next); - - void (*saturate_output)(struct cook *q, float *out); - - AVCodecContext* avctx; - DSPContext dsp; - GetBitContext gb; - /* stream data */ - int num_vectors; - int samples_per_channel; - /* states */ - AVLFG random_state; - int discarded_packets; - - /* transform data */ - FFTContext mdct_ctx; - float* mlt_window; - - /* VLC data */ - VLC envelope_quant_index[13]; - VLC sqvh[7]; // scalar quantization - - /* generatable tables and related variables */ - int gain_size_factor; - float gain_table[23]; - - /* data buffers */ - - uint8_t* decoded_bytes_buffer; - DECLARE_ALIGNED(32, float, mono_mdct_output)[2048]; - float decode_buffer_1[1024]; - float decode_buffer_2[1024]; - float decode_buffer_0[1060]; /* static allocation for joint decode */ - - const float *cplscales[5]; - int num_subpackets; - COOKSubpacket subpacket[MAX_SUBPACKETS]; -} COOKContext; - -static float pow2tab[127]; -static float rootpow2tab[127]; - -/*************** init functions ***************/ - -/* table generator */ -static av_cold void init_pow2table(void) -{ - int i; - for (i = -63; i < 64; i++) { - pow2tab[63 + i] = pow(2, i); - rootpow2tab[63 + i] = sqrt(pow(2, i)); - } -} - -/* table generator */ -static av_cold 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(pow2tab[i + 52], - (1.0 / (double) q->gain_size_factor)); -} - - -static av_cold 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(q->avctx, 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); - } - - for (i = 0; i < q->num_subpackets; i++) { - if (q->subpacket[i].joint_stereo == 1) { - result |= init_vlc(&q->subpacket[i].channel_coupling, 6, - (1 << q->subpacket[i].js_vlc_bits) - 1, - ccpl_huffbits[q->subpacket[i].js_vlc_bits - 2], 1, 1, - ccpl_huffcodes[q->subpacket[i].js_vlc_bits - 2], 2, 2, 0); - av_log(q->avctx, AV_LOG_DEBUG, "subpacket %i Joint-stereo VLC used.\n", i); - } - } - - av_log(q->avctx, AV_LOG_DEBUG, "VLC tables initialized.\n"); - return result; -} - -static av_cold int init_cook_mlt(COOKContext *q) -{ - int j, ret; - int mlt_size = q->samples_per_channel; - - if ((q->mlt_window = av_malloc(mlt_size * sizeof(*q->mlt_window))) == 0) - return AVERROR(ENOMEM); - - /* Initialize the MLT window: simple sine window. */ - ff_sine_window_init(q->mlt_window, mlt_size); - for (j = 0; j < mlt_size; j++) - q->mlt_window[j] *= sqrt(2.0 / q->samples_per_channel); - - /* Initialize the MDCT. */ - if ((ret = ff_mdct_init(&q->mdct_ctx, av_log2(mlt_size) + 1, 1, 1.0 / 32768.0))) { - av_freep(&q->mlt_window); - return ret; - } - av_log(q->avctx, AV_LOG_DEBUG, "MDCT initialized, order = %d.\n", - av_log2(mlt_size) + 1); - - return 0; -} - -static av_cold void init_cplscales_table(COOKContext *q) -{ - int i; - for (i = 0; i < 5; i++) - q->cplscales[i] = cplscales[i]; -} - -/*************** init functions end ***********/ - -#define DECODE_BYTES_PAD1(bytes) (3 - ((bytes) + 3) % 4) -#define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes))) - -/** - * 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/misalignment. - * 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 - */ -static inline int decode_bytes(const uint8_t *inbuffer, uint8_t *out, int bytes) -{ - static const uint32_t tab[4] = { - AV_BE2NE32C(0x37c511f2u), AV_BE2NE32C(0xf237c511u), - AV_BE2NE32C(0x11f237c5u), AV_BE2NE32C(0xc511f237u), - }; - int i, off; - uint32_t c; - const 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 ^ av_be2ne64(int64_t) in[i]); - * Buffer alignment needs to be checked. */ - - off = (intptr_t) inbuffer & 3; - buf = (const uint32_t *) (inbuffer - off); - c = tab[off]; - bytes += 3 + off; - for (i = 0; i < bytes / 4; i++) - obuf[i] = c ^ buf[i]; - - return off; -} - -static av_cold 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_freep(&q->mlt_window); - av_freep(&q->decoded_bytes_buffer); - - /* Free the transform. */ - ff_mdct_end(&q->mdct_ctx); - - /* Free the VLC tables. */ - for (i = 0; i < 13; i++) - ff_free_vlc(&q->envelope_quant_index[i]); - for (i = 0; i < 7; i++) - ff_free_vlc(&q->sqvh[i]); - for (i = 0; i < q->num_subpackets; i++) - ff_free_vlc(&q->subpacket[i].channel_coupling); - - av_log(avctx, AV_LOG_DEBUG, "Memory deallocated.\n"); - - return 0; -} - -/** - * Fill the gain array for the timedomain quantization. - * - * @param gb pointer to the GetBitContext - * @param gaininfo array[9] of gain indexes - */ -static void decode_gain_info(GetBitContext *gb, int *gaininfo) -{ - int i, n; - - n = get_unary(gb, 0, get_bits_left(gb)); // 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 int decode_envelope(COOKContext *q, COOKSubpacket *p, - int *quant_index_table) -{ - int i, j, vlc_index; - - quant_index_table[0] = get_bits(&q->gb, 6) - 6; // This is used later in categorize - - for (i = 1; i < p->total_subbands; i++) { - vlc_index = i; - if (i >= p->js_subband_start * 2) { - vlc_index -= p->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 - if (quant_index_table[i] > 63 || quant_index_table[i] < -63) { - av_log(q->avctx, AV_LOG_ERROR, - "Invalid quantizer %d at position %d, outside [-63, 63] range\n", - quant_index_table[i], i); - return AVERROR_INVALIDDATA; - } - } - - return 0; -} - -/** - * 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, COOKSubpacket *p, const int *quant_index_table, - int *category, int *category_index) -{ - int exp_idx, bias, tmpbias1, tmpbias2, bits_left, num_bits, index, v, i, j; - int exp_index2[102] = { 0 }; - int exp_index1[102] = { 0 }; - - int tmp_categorize_array[128 * 2] = { 0 }; - int tmp_categorize_array1_idx = p->numvector_size; - int tmp_categorize_array2_idx = p->numvector_size; - - bits_left = p->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; - - bias = -32; - - /* Estimate bias. */ - for (i = 32; i > 0; i = i / 2) { - num_bits = 0; - index = 0; - for (j = p->total_subbands; j > 0; j--) { - exp_idx = av_clip((i - quant_index_table[index] + bias) / 2, 0, 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 < p->total_subbands; i++) { - exp_idx = av_clip((bias - quant_index_table[i]) / 2, 0, 7); - num_bits += expbits_tab[exp_idx]; - exp_index1[i] = exp_idx; - exp_index2[i] = exp_idx; - } - tmpbias1 = tmpbias2 = num_bits; - - for (j = 1; j < p->numvector_size; j++) { - if (tmpbias1 + tmpbias2 > 2 * bits_left) { /* ---> */ - int max = -999999; - index = -1; - for (i = 0; i < p->total_subbands; i++) { - if (exp_index1[i] < 7) { - v = (-2 * exp_index1[i]) - quant_index_table[i] + bias; - if (v >= max) { - max = v; - index = i; - } - } - } - if (index == -1) - break; - tmp_categorize_array[tmp_categorize_array1_idx++] = index; - tmpbias1 -= expbits_tab[exp_index1[index]] - - expbits_tab[exp_index1[index] + 1]; - ++exp_index1[index]; - } else { /* <--- */ - int min = 999999; - index = -1; - for (i = 0; i < p->total_subbands; i++) { - if (exp_index2[i] > 0) { - v = (-2 * exp_index2[i]) - quant_index_table[i] + bias; - if (v < min) { - min = v; - index = i; - } - } - } - if (index == -1) - break; - tmp_categorize_array[--tmp_categorize_array2_idx] = index; - tmpbias2 -= expbits_tab[exp_index2[index]] - - expbits_tab[exp_index2[index] - 1]; - --exp_index2[index]; - } - } - - for (i = 0; i < p->total_subbands; i++) - category[i] = exp_index2[i]; - - for (i = 0; i < p->numvector_size - 1; i++) - category_index[i] = tmp_categorize_array[tmp_categorize_array2_idx++]; -} - - -/** - * 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 inline void expand_category(COOKContext *q, int *category, - int *category_index) -{ - int i; - for (i = 0; i < q->num_vectors; i++) - { - int idx = category_index[i]; - if (++category[idx] >= FF_ARRAY_ELEMS(dither_tab)) - --category[idx]; - } -} - -/** - * 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_float(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_lfg_get(&q->random_state) < 0x80000000) - f1 = -f1; - } - mlt_p[i] = f1 * 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, COOKSubpacket *p, int category, - int *subband_coef_index, int *subband_coef_sign) -{ - int i, j; - int vlc, vd, tmp, result; - - vd = vd_tab[category]; - result = 0; - for (i = 0; i < vpr_tab[category]; i++) { - vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3); - if (p->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) < p->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, COOKSubpacket *p, 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 < p->total_subbands; band++) { - index = category[band]; - if (category[band] < 7) { - if (unpack_SQVH(q, p, category[band], subband_coef_index, subband_coef_sign)) { - index = 7; - for (j = 0; j < p->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)); - } - q->scalar_dequant(q, index, quant_index_table[band], - subband_coef_index, subband_coef_sign, - &mlt_buffer[band * SUBBAND_SIZE]); - } - - /* FIXME: should this be removed, or moved into loop above? */ - if (p->total_subbands * SUBBAND_SIZE >= q->samples_per_channel) - return; -} - - -static int mono_decode(COOKContext *q, COOKSubpacket *p, float *mlt_buffer) -{ - int category_index[128] = { 0 }; - int category[128] = { 0 }; - int quant_index_table[102]; - int res, i; - - if ((res = decode_envelope(q, p, quant_index_table)) < 0) - return res; - q->num_vectors = get_bits(&q->gb, p->log2_numvector_size); - categorize(q, p, quant_index_table, category, category_index); - expand_category(q, category, category_index); - for (i=0; i<p->total_subbands; i++) { - if (category[i] > 7) - return AVERROR_INVALIDDATA; - } - decode_vectors(q, p, category, quant_index_table, mlt_buffer); - - return 0; -} - - -/** - * 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_float(COOKContext *q, float *buffer, - int gain_index, int gain_index_next) -{ - int i; - float fc1, fc2; - fc1 = pow2tab[gain_index + 63]; - - if (gain_index == gain_index_next) { // static gain - for (i = 0; i < q->gain_size_factor; i++) - buffer[i] *= fc1; - } 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; - } - } -} - -/** - * Apply transform window, overlap buffers. - * - * @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_window_float(COOKContext *q, float *inbuffer, - cook_gains *gains_ptr, float *previous_buffer) -{ - const float fc = pow2tab[gains_ptr->previous[0] + 63]; - int i; - /* 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++) - inbuffer[i] = inbuffer[i] * fc * q->mlt_window[i] - - previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i]; -} - -/** - * 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) -{ - 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.imdct_calc(&q->mdct_ctx, q->mono_mdct_output, inbuffer); - - q->imlt_window(q, buffer1, gains_ptr, previous_buffer); - - /* Apply gain profile */ - for (i = 0; i < 8; i++) - if (gains_ptr->now[i] || gains_ptr->now[i + 1]) - q->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, - q->samples_per_channel * sizeof(*previous_buffer)); -} - - -/** - * function for getting the jointstereo coupling information - * - * @param q pointer to the COOKContext - * @param decouple_tab decoupling array - */ -static int decouple_info(COOKContext *q, COOKSubpacket *p, int *decouple_tab) -{ - int i; - int vlc = get_bits1(&q->gb); - int start = cplband[p->js_subband_start]; - int end = cplband[p->subbands - 1]; - int length = end - start + 1; - - if (start > end) - return 0; - - if (vlc) - for (i = 0; i < length; i++) - decouple_tab[start + i] = get_vlc2(&q->gb, - p->channel_coupling.table, - p->channel_coupling.bits, 2); - else - for (i = 0; i < length; i++) { - int v = get_bits(&q->gb, p->js_vlc_bits); - if (v == (1<<p->js_vlc_bits)-1) { - av_log(q->avctx, AV_LOG_ERROR, "decouple value too large\n"); - return AVERROR_INVALIDDATA; - } - decouple_tab[start + i] = v; - } - return 0; -} - -/** - * function decouples a pair of signals from a single signal via multiplication. - * - * @param q pointer to the COOKContext - * @param subband index of the current subband - * @param f1 multiplier for channel 1 extraction - * @param f2 multiplier for channel 2 extraction - * @param decode_buffer input buffer - * @param mlt_buffer1 pointer to left channel mlt coefficients - * @param mlt_buffer2 pointer to right channel mlt coefficients - */ -static void decouple_float(COOKContext *q, - COOKSubpacket *p, - int subband, - float f1, float f2, - float *decode_buffer, - float *mlt_buffer1, float *mlt_buffer2) -{ - int j, tmp_idx; - for (j = 0; j < SUBBAND_SIZE; j++) { - tmp_idx = ((p->js_subband_start + subband) * SUBBAND_SIZE) + j; - mlt_buffer1[SUBBAND_SIZE * subband + j] = f1 * decode_buffer[tmp_idx]; - mlt_buffer2[SUBBAND_SIZE * subband + j] = f2 * decode_buffer[tmp_idx]; - } -} - -/** - * 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 int joint_decode(COOKContext *q, COOKSubpacket *p, - float *mlt_buffer_left, float *mlt_buffer_right) -{ - int i, j, res; - int decouple_tab[SUBBAND_SIZE] = { 0 }; - float *decode_buffer = q->decode_buffer_0; - int idx, cpl_tmp; - float f1, f2; - const float *cplscale; - - memset(decode_buffer, 0, sizeof(q->decode_buffer_0)); - - /* Make sure the buffers are zeroed out. */ - memset(mlt_buffer_left, 0, 1024 * sizeof(*mlt_buffer_left)); - memset(mlt_buffer_right, 0, 1024 * sizeof(*mlt_buffer_right)); - if ((res = decouple_info(q, p, decouple_tab)) < 0) - return res; - if ((res = mono_decode(q, p, decode_buffer)) < 0) - return res; - /* The two channels are stored interleaved in decode_buffer. */ - for (i = 0; i < p->js_subband_start; i++) { - for (j = 0; j < SUBBAND_SIZE; j++) { - mlt_buffer_left[i * 20 + j] = decode_buffer[i * 40 + j]; - mlt_buffer_right[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 << p->js_vlc_bits) - 1; - for (i = p->js_subband_start; i < p->subbands; i++) { - cpl_tmp = cplband[i]; - idx -= decouple_tab[cpl_tmp]; - cplscale = q->cplscales[p->js_vlc_bits - 2]; // choose decoupler table - f1 = cplscale[decouple_tab[cpl_tmp] + 1]; - f2 = cplscale[idx]; - q->decouple(q, p, i, f1, f2, decode_buffer, - mlt_buffer_left, mlt_buffer_right); - idx = (1 << p->js_vlc_bits) - 1; - } - - return 0; -} - -/** - * 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 gains_ptr array of current/prev gain pointers - */ -static inline void decode_bytes_and_gain(COOKContext *q, COOKSubpacket *p, - const uint8_t *inbuffer, - cook_gains *gains_ptr) -{ - int offset; - - offset = decode_bytes(inbuffer, q->decoded_bytes_buffer, - p->bits_per_subpacket / 8); - init_get_bits(&q->gb, q->decoded_bytes_buffer + offset, - p->bits_per_subpacket); - decode_gain_info(&q->gb, gains_ptr->now); - - /* Swap current and previous gains */ - FFSWAP(int *, gains_ptr->now, gains_ptr->previous); -} - -/** - * Saturate the output signal and interleave. - * - * @param q pointer to the COOKContext - * @param out pointer to the output vector - */ -static void saturate_output_float(COOKContext *q, float *out) -{ - q->dsp.vector_clipf(out, q->mono_mdct_output + q->samples_per_channel, - -1.0f, 1.0f, FFALIGN(q->samples_per_channel, 8)); -} - - -/** - * 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 gains_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 - */ -static inline void mlt_compensate_output(COOKContext *q, float *decode_buffer, - cook_gains *gains_ptr, float *previous_buffer, - float *out) -{ - imlt_gain(q, decode_buffer, gains_ptr, previous_buffer); - if (out) - q->saturate_output(q, out); -} - - -/** - * 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 outbuffer pointer to the outbuffer - */ -static int decode_subpacket(COOKContext *q, COOKSubpacket *p, - const uint8_t *inbuffer, float **outbuffer) -{ - int sub_packet_size = p->size; - int res; - - memset(q->decode_buffer_1, 0, sizeof(q->decode_buffer_1)); - decode_bytes_and_gain(q, p, inbuffer, &p->gains1); - - if (p->joint_stereo) { - if ((res = joint_decode(q, p, q->decode_buffer_1, q->decode_buffer_2)) < 0) - return res; - } else { - if ((res = mono_decode(q, p, q->decode_buffer_1)) < 0) - return res; - - if (p->num_channels == 2) { - decode_bytes_and_gain(q, p, inbuffer + sub_packet_size / 2, &p->gains2); - if ((res = mono_decode(q, p, q->decode_buffer_2)) < 0) - return res; - } - } - - mlt_compensate_output(q, q->decode_buffer_1, &p->gains1, - p->mono_previous_buffer1, - outbuffer ? outbuffer[p->ch_idx] : NULL); - - if (p->num_channels == 2) { - if (p->joint_stereo) - mlt_compensate_output(q, q->decode_buffer_2, &p->gains1, - p->mono_previous_buffer2, - outbuffer ? outbuffer[p->ch_idx + 1] : NULL); - else - mlt_compensate_output(q, q->decode_buffer_2, &p->gains2, - p->mono_previous_buffer2, - outbuffer ? outbuffer[p->ch_idx + 1] : NULL); - } - - return 0; -} - - -static int cook_decode_frame(AVCodecContext *avctx, void *data, - int *got_frame_ptr, AVPacket *avpkt) -{ - AVFrame *frame = data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - COOKContext *q = avctx->priv_data; - float **samples = NULL; - int i, ret; - int offset = 0; - int chidx = 0; - - if (buf_size < avctx->block_align) - return buf_size; - - /* get output buffer */ - if (q->discarded_packets >= 2) { - frame->nb_samples = q->samples_per_channel; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - samples = (float **)frame->extended_data; - } - - /* estimate subpacket sizes */ - q->subpacket[0].size = avctx->block_align; - - for (i = 1; i < q->num_subpackets; i++) { - q->subpacket[i].size = 2 * buf[avctx->block_align - q->num_subpackets + i]; - q->subpacket[0].size -= q->subpacket[i].size + 1; - if (q->subpacket[0].size < 0) { - av_log(avctx, AV_LOG_DEBUG, - "frame subpacket size total > avctx->block_align!\n"); - return AVERROR_INVALIDDATA; - } - } - - /* decode supbackets */ - for (i = 0; i < q->num_subpackets; i++) { - q->subpacket[i].bits_per_subpacket = (q->subpacket[i].size * 8) >> - q->subpacket[i].bits_per_subpdiv; - q->subpacket[i].ch_idx = chidx; - av_log(avctx, AV_LOG_DEBUG, - "subpacket[%i] size %i js %i %i block_align %i\n", - i, q->subpacket[i].size, q->subpacket[i].joint_stereo, offset, - avctx->block_align); - - if ((ret = decode_subpacket(q, &q->subpacket[i], buf + offset, samples)) < 0) - return ret; - offset += q->subpacket[i].size; - chidx += q->subpacket[i].num_channels; - av_log(avctx, AV_LOG_DEBUG, "subpacket[%i] %i %i\n", - i, q->subpacket[i].size * 8, get_bits_count(&q->gb)); - } - - /* Discard the first two frames: no valid audio. */ - if (q->discarded_packets < 2) { - q->discarded_packets++; - *got_frame_ptr = 0; - return avctx->block_align; - } - - *got_frame_ptr = 1; - - return avctx->block_align; -} - -#ifdef DEBUG -static void dump_cook_context(COOKContext *q) -{ - //int i=0; -#define PRINT(a, b) av_dlog(q->avctx, " %s = %d\n", a, b); - av_dlog(q->avctx, "COOKextradata\n"); - av_dlog(q->avctx, "cookversion=%x\n", q->subpacket[0].cookversion); - if (q->subpacket[0].cookversion > STEREO) { - PRINT("js_subband_start", q->subpacket[0].js_subband_start); - PRINT("js_vlc_bits", q->subpacket[0].js_vlc_bits); - } - av_dlog(q->avctx, "COOKContext\n"); - PRINT("nb_channels", q->avctx->channels); - PRINT("bit_rate", q->avctx->bit_rate); - PRINT("sample_rate", q->avctx->sample_rate); - PRINT("samples_per_channel", q->subpacket[0].samples_per_channel); - PRINT("subbands", q->subpacket[0].subbands); - PRINT("js_subband_start", q->subpacket[0].js_subband_start); - PRINT("log2_numvector_size", q->subpacket[0].log2_numvector_size); - PRINT("numvector_size", q->subpacket[0].numvector_size); - PRINT("total_subbands", q->subpacket[0].total_subbands); -} -#endif - -/** - * Cook initialization - * - * @param avctx pointer to the AVCodecContext - */ -static av_cold int cook_decode_init(AVCodecContext *avctx) -{ - COOKContext *q = avctx->priv_data; - const uint8_t *edata_ptr = avctx->extradata; - const uint8_t *edata_ptr_end = edata_ptr + avctx->extradata_size; - int extradata_size = avctx->extradata_size; - int s = 0; - unsigned int channel_mask = 0; - int samples_per_frame = 0; - int ret; - q->avctx = avctx; - - /* Take care of the codec specific extradata. */ - if (extradata_size <= 0) { - av_log(avctx, AV_LOG_ERROR, "Necessary extradata missing!\n"); - return AVERROR_INVALIDDATA; - } - av_log(avctx, AV_LOG_DEBUG, "codecdata_length=%d\n", avctx->extradata_size); - - /* Take data from the AVCodecContext (RM container). */ - if (!avctx->channels) { - av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n"); - return AVERROR_INVALIDDATA; - } - - /* Initialize RNG. */ - av_lfg_init(&q->random_state, 0); - - ff_dsputil_init(&q->dsp, avctx); - - while (edata_ptr < edata_ptr_end) { - /* 8 for mono, 16 for stereo, ? for multichannel - Swap to right endianness so we don't need to care later on. */ - if (extradata_size >= 8) { - q->subpacket[s].cookversion = bytestream_get_be32(&edata_ptr); - samples_per_frame = bytestream_get_be16(&edata_ptr); - q->subpacket[s].subbands = bytestream_get_be16(&edata_ptr); - extradata_size -= 8; - } - if (extradata_size >= 8) { - bytestream_get_be32(&edata_ptr); // Unknown unused - q->subpacket[s].js_subband_start = bytestream_get_be16(&edata_ptr); - if (q->subpacket[s].js_subband_start >= 51) { - av_log(avctx, AV_LOG_ERROR, "js_subband_start %d is too large\n", q->subpacket[s].js_subband_start); - return AVERROR_INVALIDDATA; - } - - q->subpacket[s].js_vlc_bits = bytestream_get_be16(&edata_ptr); - extradata_size -= 8; - } - - /* Initialize extradata related variables. */ - q->subpacket[s].samples_per_channel = samples_per_frame / avctx->channels; - q->subpacket[s].bits_per_subpacket = avctx->block_align * 8; - - /* Initialize default data states. */ - q->subpacket[s].log2_numvector_size = 5; - q->subpacket[s].total_subbands = q->subpacket[s].subbands; - q->subpacket[s].num_channels = 1; - - /* Initialize version-dependent variables */ - - av_log(avctx, AV_LOG_DEBUG, "subpacket[%i].cookversion=%x\n", s, - q->subpacket[s].cookversion); - q->subpacket[s].joint_stereo = 0; - switch (q->subpacket[s].cookversion) { - case MONO: - if (avctx->channels != 1) { - avpriv_request_sample(avctx, "Container channels != 1"); - return AVERROR_PATCHWELCOME; - } - av_log(avctx, AV_LOG_DEBUG, "MONO\n"); - break; - case STEREO: - if (avctx->channels != 1) { - q->subpacket[s].bits_per_subpdiv = 1; - q->subpacket[s].num_channels = 2; - } - av_log(avctx, AV_LOG_DEBUG, "STEREO\n"); - break; - case JOINT_STEREO: - if (avctx->channels != 2) { - avpriv_request_sample(avctx, "Container channels != 2"); - return AVERROR_PATCHWELCOME; - } - av_log(avctx, AV_LOG_DEBUG, "JOINT_STEREO\n"); - if (avctx->extradata_size >= 16) { - q->subpacket[s].total_subbands = q->subpacket[s].subbands + - q->subpacket[s].js_subband_start; - q->subpacket[s].joint_stereo = 1; - q->subpacket[s].num_channels = 2; - } - if (q->subpacket[s].samples_per_channel > 256) { - q->subpacket[s].log2_numvector_size = 6; - } - if (q->subpacket[s].samples_per_channel > 512) { - q->subpacket[s].log2_numvector_size = 7; - } - break; - case MC_COOK: - av_log(avctx, AV_LOG_DEBUG, "MULTI_CHANNEL\n"); - if (extradata_size >= 4) - channel_mask |= q->subpacket[s].channel_mask = bytestream_get_be32(&edata_ptr); - - if (av_get_channel_layout_nb_channels(q->subpacket[s].channel_mask) > 1) { - q->subpacket[s].total_subbands = q->subpacket[s].subbands + - q->subpacket[s].js_subband_start; - q->subpacket[s].joint_stereo = 1; - q->subpacket[s].num_channels = 2; - q->subpacket[s].samples_per_channel = samples_per_frame >> 1; - - if (q->subpacket[s].samples_per_channel > 256) { - q->subpacket[s].log2_numvector_size = 6; - } - if (q->subpacket[s].samples_per_channel > 512) { - q->subpacket[s].log2_numvector_size = 7; - } - } else - q->subpacket[s].samples_per_channel = samples_per_frame; - - break; - default: - avpriv_request_sample(avctx, "Cook version %d", - q->subpacket[s].cookversion); - return AVERROR_PATCHWELCOME; - } - - if (s > 1 && q->subpacket[s].samples_per_channel != q->samples_per_channel) { - av_log(avctx, AV_LOG_ERROR, "different number of samples per channel!\n"); - return AVERROR_INVALIDDATA; - } else - q->samples_per_channel = q->subpacket[0].samples_per_channel; - - - /* Initialize variable relations */ - q->subpacket[s].numvector_size = (1 << q->subpacket[s].log2_numvector_size); - - /* Try to catch some obviously faulty streams, othervise it might be exploitable */ - if (q->subpacket[s].total_subbands > 53) { - avpriv_request_sample(avctx, "total_subbands > 53"); - return AVERROR_PATCHWELCOME; - } - - if ((q->subpacket[s].js_vlc_bits > 6) || - (q->subpacket[s].js_vlc_bits < 2 * q->subpacket[s].joint_stereo)) { - av_log(avctx, AV_LOG_ERROR, "js_vlc_bits = %d, only >= %d and <= 6 allowed!\n", - q->subpacket[s].js_vlc_bits, 2 * q->subpacket[s].joint_stereo); - return AVERROR_INVALIDDATA; - } - - if (q->subpacket[s].subbands > 50) { - avpriv_request_sample(avctx, "subbands > 50"); - return AVERROR_PATCHWELCOME; - } - if (q->subpacket[s].subbands == 0) { - avpriv_request_sample(avctx, "subbands = 0"); - return AVERROR_PATCHWELCOME; - } - q->subpacket[s].gains1.now = q->subpacket[s].gain_1; - q->subpacket[s].gains1.previous = q->subpacket[s].gain_2; - q->subpacket[s].gains2.now = q->subpacket[s].gain_3; - q->subpacket[s].gains2.previous = q->subpacket[s].gain_4; - - if (q->num_subpackets + q->subpacket[s].num_channels > q->avctx->channels) { - av_log(avctx, AV_LOG_ERROR, "Too many subpackets %d for channels %d\n", q->num_subpackets, q->avctx->channels); - return AVERROR_INVALIDDATA; - } - - q->num_subpackets++; - s++; - if (s > MAX_SUBPACKETS) { - avpriv_request_sample(avctx, "subpackets > %d", MAX_SUBPACKETS); - return AVERROR_PATCHWELCOME; - } - } - /* Generate tables */ - init_pow2table(); - init_gain_table(q); - init_cplscales_table(q); - - if ((ret = init_cook_vlc_tables(q))) - return ret; - - - if (avctx->block_align >= UINT_MAX / 2) - return AVERROR(EINVAL); - - /* Pad the databuffer with: - DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(), - FF_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */ - 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 AVERROR(ENOMEM); - - /* Initialize transform. */ - if ((ret = init_cook_mlt(q))) - return ret; - - /* Initialize COOK signal arithmetic handling */ - if (1) { - q->scalar_dequant = scalar_dequant_float; - q->decouple = decouple_float; - q->imlt_window = imlt_window_float; - q->interpolate = interpolate_float; - q->saturate_output = saturate_output_float; - } - - /* Try to catch some obviously faulty streams, othervise it might be exploitable */ - if (q->samples_per_channel != 256 && q->samples_per_channel != 512 && - q->samples_per_channel != 1024) { - avpriv_request_sample(avctx, "samples_per_channel = %d", - q->samples_per_channel); - return AVERROR_PATCHWELCOME; - } - - avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; - if (channel_mask) - avctx->channel_layout = channel_mask; - else - avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; - -#ifdef DEBUG - dump_cook_context(q); -#endif - return 0; -} - -AVCodec ff_cook_decoder = { - .name = "cook", - .long_name = NULL_IF_CONFIG_SMALL("Cook / Cooker / Gecko (RealAudio G2)"), - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_COOK, - .priv_data_size = sizeof(COOKContext), - .init = cook_decode_init, - .close = cook_decode_close, - .decode = cook_decode_frame, - .capabilities = CODEC_CAP_DR1, - .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, - AV_SAMPLE_FMT_NONE }, -}; |