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Diffstat (limited to 'libavcodec/g729dec.c')
| -rw-r--r-- | libavcodec/g729dec.c | 331 |
1 files changed, 0 insertions, 331 deletions
diff --git a/libavcodec/g729dec.c b/libavcodec/g729dec.c deleted file mode 100644 index 71e7c5d4c8..0000000000 --- a/libavcodec/g729dec.c +++ /dev/null @@ -1,331 +0,0 @@ -/* - * G.729 decoder - * Copyright (c) 2008 Vladimir Voroshilov - * - * This file is part of Libav. - * - * Libav 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. - * - * Libav 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 Libav; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ -#include <stdlib.h> -#include <inttypes.h> -#include <limits.h> -#include <stdio.h> -#include <string.h> -#include <math.h> -#include <assert.h> - -#include "avcodec.h" -#include "libavutil/avutil.h" -#include "get_bits.h" - -#include "lsp.h" -#include "celp_math.h" -#include "acelp_filters.h" -#include "acelp_pitch_delay.h" -#include "acelp_vectors.h" -#include "g729data.h" - -/** - * minimum quantized LSF value (3.2.4) - * 0.005 in Q13 - */ -#define LSFQ_MIN 40 - -/** - * maximum quantized LSF value (3.2.4) - * 3.135 in Q13 - */ -#define LSFQ_MAX 25681 - -/** - * minimum LSF distance (3.2.4) - * 0.0391 in Q13 - */ -#define LSFQ_DIFF_MIN 321 - -/** - * minimum gain pitch value (3.8, Equation 47) - * 0.2 in (1.14) - */ -#define SHARP_MIN 3277 - -/** - * maximum gain pitch value (3.8, Equation 47) - * (EE) This does not comply with the specification. - * Specification says about 0.8, which should be - * 13107 in (1.14), but reference C code uses - * 13017 (equals to 0.7945) instead of it. - */ -#define SHARP_MAX 13017 - -/** - * subframe size - */ -#define SUBFRAME_SIZE 40 - - -typedef struct { - uint8_t ac_index_bits[2]; ///< adaptive codebook index for second subframe (size in bits) - uint8_t parity_bit; ///< parity bit for pitch delay - uint8_t gc_1st_index_bits; ///< gain codebook (first stage) index (size in bits) - uint8_t gc_2nd_index_bits; ///< gain codebook (second stage) index (size in bits) - uint8_t fc_signs_bits; ///< number of pulses in fixed-codebook vector - uint8_t fc_indexes_bits; ///< size (in bits) of fixed-codebook index entry -} G729FormatDescription; - -typedef struct { - int pitch_delay_int_prev; ///< integer part of previous subframe's pitch delay (4.1.3) - - /// (2.13) LSP quantizer outputs - int16_t past_quantizer_output_buf[MA_NP + 1][10]; - int16_t* past_quantizer_outputs[MA_NP + 1]; - - int16_t lsfq[10]; ///< (2.13) quantized LSF coefficients from previous frame - int16_t lsp_buf[2][10]; ///< (0.15) LSP coefficients (previous and current frames) (3.2.5) - int16_t *lsp[2]; ///< pointers to lsp_buf -} G729Context; - -static const G729FormatDescription format_g729_8k = { - .ac_index_bits = {8,5}, - .parity_bit = 1, - .gc_1st_index_bits = GC_1ST_IDX_BITS_8K, - .gc_2nd_index_bits = GC_2ND_IDX_BITS_8K, - .fc_signs_bits = 4, - .fc_indexes_bits = 13, -}; - -static const G729FormatDescription format_g729d_6k4 = { - .ac_index_bits = {8,4}, - .parity_bit = 0, - .gc_1st_index_bits = GC_1ST_IDX_BITS_6K4, - .gc_2nd_index_bits = GC_2ND_IDX_BITS_6K4, - .fc_signs_bits = 2, - .fc_indexes_bits = 9, -}; - -/** - * @brief pseudo random number generator - */ -static inline uint16_t g729_prng(uint16_t value) -{ - return 31821 * value + 13849; -} - -/** - * Get parity bit of bit 2..7 - */ -static inline int get_parity(uint8_t value) -{ - return (0x6996966996696996ULL >> (value >> 2)) & 1; -} - -static void lsf_decode(int16_t* lsfq, int16_t* past_quantizer_outputs[MA_NP + 1], - int16_t ma_predictor, - int16_t vq_1st, int16_t vq_2nd_low, int16_t vq_2nd_high) -{ - int i,j; - static const uint8_t min_distance[2]={10, 5}; //(2.13) - int16_t* quantizer_output = past_quantizer_outputs[MA_NP]; - - for (i = 0; i < 5; i++) { - quantizer_output[i] = cb_lsp_1st[vq_1st][i ] + cb_lsp_2nd[vq_2nd_low ][i ]; - quantizer_output[i + 5] = cb_lsp_1st[vq_1st][i + 5] + cb_lsp_2nd[vq_2nd_high][i + 5]; - } - - for (j = 0; j < 2; j++) { - for (i = 1; i < 10; i++) { - int diff = (quantizer_output[i - 1] - quantizer_output[i] + min_distance[j]) >> 1; - if (diff > 0) { - quantizer_output[i - 1] -= diff; - quantizer_output[i ] += diff; - } - } - } - - for (i = 0; i < 10; i++) { - int sum = quantizer_output[i] * cb_ma_predictor_sum[ma_predictor][i]; - for (j = 0; j < MA_NP; j++) - sum += past_quantizer_outputs[j][i] * cb_ma_predictor[ma_predictor][j][i]; - - lsfq[i] = sum >> 15; - } - - /* Rotate past_quantizer_outputs. */ - memmove(past_quantizer_outputs + 1, past_quantizer_outputs, MA_NP * sizeof(int16_t*)); - past_quantizer_outputs[0] = quantizer_output; - - ff_acelp_reorder_lsf(lsfq, LSFQ_DIFF_MIN, LSFQ_MIN, LSFQ_MAX, 10); -} - -static av_cold int decoder_init(AVCodecContext * avctx) -{ - G729Context* ctx = avctx->priv_data; - int i,k; - - if (avctx->channels != 1) { - av_log(avctx, AV_LOG_ERROR, "Only mono sound is supported (requested channels: %d).\n", avctx->channels); - return AVERROR(EINVAL); - } - - /* Both 8kbit/s and 6.4kbit/s modes uses two subframes per frame. */ - avctx->frame_size = SUBFRAME_SIZE << 1; - - for (k = 0; k < MA_NP + 1; k++) { - ctx->past_quantizer_outputs[k] = ctx->past_quantizer_output_buf[k]; - for (i = 1; i < 11; i++) - ctx->past_quantizer_outputs[k][i - 1] = (18717 * i) >> 3; - } - - ctx->lsp[0] = ctx->lsp_buf[0]; - ctx->lsp[1] = ctx->lsp_buf[1]; - memcpy(ctx->lsp[0], lsp_init, 10 * sizeof(int16_t)); - - return 0; -} - -static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, - AVPacket *avpkt) -{ - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - int16_t *out_frame = data; - GetBitContext gb; - G729FormatDescription format; - int frame_erasure = 0; ///< frame erasure detected during decoding - int bad_pitch = 0; ///< parity check failed - int i; - G729Context *ctx = avctx->priv_data; - int16_t lp[2][11]; // (3.12) - uint8_t ma_predictor; ///< switched MA predictor of LSP quantizer - uint8_t quantizer_1st; ///< first stage vector of quantizer - uint8_t quantizer_2nd_lo; ///< second stage lower vector of quantizer (size in bits) - uint8_t quantizer_2nd_hi; ///< second stage higher vector of quantizer (size in bits) - - int pitch_delay_int; // pitch delay, integer part - int pitch_delay_3x; // pitch delay, multiplied by 3 - - if (*data_size < SUBFRAME_SIZE << 2) { - av_log(avctx, AV_LOG_ERROR, "Error processing packet: output buffer too small\n"); - return AVERROR(EIO); - } - - if (buf_size == 10) { - format = format_g729_8k; - av_log(avctx, AV_LOG_DEBUG, "Packet type: %s\n", "G.729 @ 8kbit/s"); - } else if (buf_size == 8) { - format = format_g729d_6k4; - av_log(avctx, AV_LOG_DEBUG, "Packet type: %s\n", "G.729D @ 6.4kbit/s"); - } else { - av_log(avctx, AV_LOG_ERROR, "Packet size %d is unknown.\n", buf_size); - return AVERROR_INVALIDDATA; - } - - for (i=0; i < buf_size; i++) - frame_erasure |= buf[i]; - frame_erasure = !frame_erasure; - - init_get_bits(&gb, buf, buf_size); - - ma_predictor = get_bits(&gb, 1); - quantizer_1st = get_bits(&gb, VQ_1ST_BITS); - quantizer_2nd_lo = get_bits(&gb, VQ_2ND_BITS); - quantizer_2nd_hi = get_bits(&gb, VQ_2ND_BITS); - - lsf_decode(ctx->lsfq, ctx->past_quantizer_outputs, - ma_predictor, - quantizer_1st, quantizer_2nd_lo, quantizer_2nd_hi); - - ff_acelp_lsf2lsp(ctx->lsp[1], ctx->lsfq, 10); - - ff_acelp_lp_decode(&lp[0][0], &lp[1][0], ctx->lsp[1], ctx->lsp[0], 10); - - FFSWAP(int16_t*, ctx->lsp[1], ctx->lsp[0]); - - for (i = 0; i < 2; i++) { - uint8_t ac_index; ///< adaptive codebook index - uint8_t pulses_signs; ///< fixed-codebook vector pulse signs - int fc_indexes; ///< fixed-codebook indexes - uint8_t gc_1st_index; ///< gain codebook (first stage) index - uint8_t gc_2nd_index; ///< gain codebook (second stage) index - - ac_index = get_bits(&gb, format.ac_index_bits[i]); - if(!i && format.parity_bit) - bad_pitch = get_parity(ac_index) == get_bits1(&gb); - fc_indexes = get_bits(&gb, format.fc_indexes_bits); - pulses_signs = get_bits(&gb, format.fc_signs_bits); - gc_1st_index = get_bits(&gb, format.gc_1st_index_bits); - gc_2nd_index = get_bits(&gb, format.gc_2nd_index_bits); - - if(!i) { - if (bad_pitch) - pitch_delay_3x = 3 * ctx->pitch_delay_int_prev; - else - pitch_delay_3x = ff_acelp_decode_8bit_to_1st_delay3(ac_index); - } else { - int pitch_delay_min = av_clip(ctx->pitch_delay_int_prev - 5, - PITCH_DELAY_MIN, PITCH_DELAY_MAX - 9); - - if(packet_type == FORMAT_G729D_6K4) - pitch_delay_3x = ff_acelp_decode_4bit_to_2nd_delay3(ac_index, pitch_delay_min); - else - pitch_delay_3x = ff_acelp_decode_5_6_bit_to_2nd_delay3(ac_index, pitch_delay_min); - } - - /* Round pitch delay to nearest (used everywhere except ff_acelp_interpolate). */ - pitch_delay_int = (pitch_delay_3x + 1) / 3; - - ff_acelp_weighted_vector_sum(fc + pitch_delay_int, - fc + pitch_delay_int, - fc, 1 << 14, - av_clip(ctx->gain_pitch, SHARP_MIN, SHARP_MAX), - 0, 14, - SUBFRAME_SIZE - pitch_delay_int); - - if (frame_erasure) { - ctx->gain_pitch = (29491 * ctx->gain_pitch) >> 15; // 0.90 (0.15) - ctx->gain_code = ( 2007 * ctx->gain_code ) >> 11; // 0.98 (0.11) - - gain_corr_factor = 0; - } else { - ctx->gain_pitch = cb_gain_1st_8k[gc_1st_index][0] + - cb_gain_2nd_8k[gc_2nd_index][0]; - gain_corr_factor = cb_gain_1st_8k[gc_1st_index][1] + - cb_gain_2nd_8k[gc_2nd_index][1]; - - ff_acelp_weighted_vector_sum(ctx->exc + i * SUBFRAME_SIZE, - ctx->exc + i * SUBFRAME_SIZE, fc, - (!voicing && frame_erasure) ? 0 : ctx->gain_pitch, - ( voicing && frame_erasure) ? 0 : ctx->gain_code, - 1 << 13, 14, SUBFRAME_SIZE); - - ctx->pitch_delay_int_prev = pitch_delay_int; - } - - *data_size = SUBFRAME_SIZE << 2; - return buf_size; -} - -AVCodec ff_g729_decoder = -{ - "g729", - AVMEDIA_TYPE_AUDIO, - CODEC_ID_G729, - sizeof(G729Context), - decoder_init, - NULL, - NULL, - decode_frame, - .long_name = NULL_IF_CONFIG_SMALL("G.729"), -}; |