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/* |
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* Enhanced Variable Rate Codec, Service Option 3 decoder |
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* Copyright (c) 2013 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* Enhanced Variable Rate Codec, Service Option 3 decoder |
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* @author Paul B Mahol |
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*/ |
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#include "libavutil/mathematics.h" |
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#include "libavutil/opt.h" |
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#include "avcodec.h" |
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#include "internal.h" |
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#include "get_bits.h" |
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#include "evrcdata.h" |
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#include "acelp_vectors.h" |
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#include "lsp.h" |
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#define MIN_LSP_SEP (0.05 / (2.0 * M_PI)) |
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#define MIN_DELAY 20 |
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#define MAX_DELAY 120 |
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#define NB_SUBFRAMES 3 |
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#define SUBFRAME_SIZE 54 |
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#define FILTER_ORDER 10 |
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#define ACB_SIZE 128 |
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typedef enum { |
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RATE_ERRS = -1, |
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SILENCE, |
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RATE_QUANT, |
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RATE_QUARTER, |
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RATE_HALF, |
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RATE_FULL, |
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} evrc_packet_rate; |
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/** |
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* EVRC-A unpacked data frame |
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*/ |
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typedef struct EVRCAFrame { |
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uint8_t lpc_flag; ///< spectral change indicator |
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uint16_t lsp[4]; ///< index into LSP codebook |
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uint8_t pitch_delay; ///< pitch delay for entire frame |
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uint8_t delay_diff; ///< delay difference for entire frame |
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uint8_t acb_gain[3]; ///< adaptive codebook gain |
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uint16_t fcb_shape[3][4]; ///< fixed codebook shape |
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uint8_t fcb_gain[3]; ///< fixed codebook gain index |
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uint8_t energy_gain; ///< frame energy gain index |
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uint8_t tty; ///< tty baud rate bit |
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} EVRCAFrame; |
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typedef struct EVRCContext { |
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AVClass *class; |
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int postfilter; |
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GetBitContext gb; |
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evrc_packet_rate bitrate; |
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evrc_packet_rate last_valid_bitrate; |
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EVRCAFrame frame; |
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float lspf[FILTER_ORDER]; |
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float prev_lspf[FILTER_ORDER]; |
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float synthesis[FILTER_ORDER]; |
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float postfilter_fir[FILTER_ORDER]; |
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float postfilter_iir[FILTER_ORDER]; |
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float postfilter_residual[ACB_SIZE + SUBFRAME_SIZE]; |
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float pitch_delay; |
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float prev_pitch_delay; |
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float avg_acb_gain; ///< average adaptive codebook gain |
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float avg_fcb_gain; ///< average fixed codebook gain |
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float pitch[ACB_SIZE + FILTER_ORDER + SUBFRAME_SIZE]; |
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float pitch_back[ACB_SIZE]; |
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float interpolation_coeffs[136]; |
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float energy_vector[NB_SUBFRAMES]; |
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float fade_scale; |
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float last; |
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uint8_t prev_energy_gain; |
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uint8_t prev_error_flag; |
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uint8_t warned_buf_mismatch_bitrate; |
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} EVRCContext; |
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/** |
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* Frame unpacking for RATE_FULL, RATE_HALF and RATE_QUANT |
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* |
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* @param e the context |
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* |
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* TIA/IS-127 Table 4.21-1 |
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*/ |
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static void unpack_frame(EVRCContext *e) |
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{ |
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EVRCAFrame *frame = &e->frame; |
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GetBitContext *gb = &e->gb; |
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switch (e->bitrate) { |
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case RATE_FULL: |
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frame->lpc_flag = get_bits1(gb); |
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frame->lsp[0] = get_bits(gb, 6); |
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frame->lsp[1] = get_bits(gb, 6); |
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frame->lsp[2] = get_bits(gb, 9); |
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frame->lsp[3] = get_bits(gb, 7); |
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frame->pitch_delay = get_bits(gb, 7); |
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frame->delay_diff = get_bits(gb, 5); |
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frame->acb_gain[0] = get_bits(gb, 3); |
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frame->fcb_shape[0][0] = get_bits(gb, 8); |
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frame->fcb_shape[0][1] = get_bits(gb, 8); |
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frame->fcb_shape[0][2] = get_bits(gb, 8); |
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frame->fcb_shape[0][3] = get_bits(gb, 11); |
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frame->fcb_gain[0] = get_bits(gb, 5); |
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frame->acb_gain[1] = get_bits(gb, 3); |
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frame->fcb_shape[1][0] = get_bits(gb, 8); |
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frame->fcb_shape[1][1] = get_bits(gb, 8); |
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frame->fcb_shape[1][2] = get_bits(gb, 8); |
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frame->fcb_shape[1][3] = get_bits(gb, 11); |
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frame->fcb_gain [1] = get_bits(gb, 5); |
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frame->acb_gain [2] = get_bits(gb, 3); |
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frame->fcb_shape[2][0] = get_bits(gb, 8); |
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frame->fcb_shape[2][1] = get_bits(gb, 8); |
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frame->fcb_shape[2][2] = get_bits(gb, 8); |
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frame->fcb_shape[2][3] = get_bits(gb, 11); |
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frame->fcb_gain [2] = get_bits(gb, 5); |
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frame->tty = get_bits1(gb); |
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break; |
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case RATE_HALF: |
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frame->lsp [0] = get_bits(gb, 7); |
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frame->lsp [1] = get_bits(gb, 7); |
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frame->lsp [2] = get_bits(gb, 8); |
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frame->pitch_delay = get_bits(gb, 7); |
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frame->acb_gain [0] = get_bits(gb, 3); |
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frame->fcb_shape[0][0] = get_bits(gb, 10); |
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frame->fcb_gain [0] = get_bits(gb, 4); |
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frame->acb_gain [1] = get_bits(gb, 3); |
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frame->fcb_shape[1][0] = get_bits(gb, 10); |
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frame->fcb_gain [1] = get_bits(gb, 4); |
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frame->acb_gain [2] = get_bits(gb, 3); |
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frame->fcb_shape[2][0] = get_bits(gb, 10); |
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frame->fcb_gain [2] = get_bits(gb, 4); |
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break; |
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case RATE_QUANT: |
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frame->lsp [0] = get_bits(gb, 4); |
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frame->lsp [1] = get_bits(gb, 4); |
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frame->energy_gain = get_bits(gb, 8); |
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break; |
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} |
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} |
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static evrc_packet_rate buf_size2bitrate(const int buf_size) |
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{ |
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switch (buf_size) { |
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case 23: return RATE_FULL; |
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case 11: return RATE_HALF; |
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case 6: return RATE_QUARTER; |
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case 3: return RATE_QUANT; |
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case 1: return SILENCE; |
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} |
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return RATE_ERRS; |
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} |
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/** |
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* Determine the bitrate from the frame size and/or the first byte of the frame. |
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* |
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* @param avctx the AV codec context |
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* @param buf_size length of the buffer |
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* @param buf the bufffer |
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* |
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* @return the bitrate on success, |
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* RATE_ERRS if the bitrate cannot be satisfactorily determined |
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*/ |
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static evrc_packet_rate determine_bitrate(AVCodecContext *avctx, |
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int *buf_size, |
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const uint8_t **buf) |
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{ |
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evrc_packet_rate bitrate; |
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if ((bitrate = buf_size2bitrate(*buf_size)) >= 0) { |
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if (bitrate > **buf) { |
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EVRCContext *e = avctx->priv_data; |
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if (!e->warned_buf_mismatch_bitrate) { |
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av_log(avctx, AV_LOG_WARNING, |
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"Claimed bitrate and buffer size mismatch.\n"); |
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e->warned_buf_mismatch_bitrate = 1; |
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} |
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bitrate = **buf; |
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} else if (bitrate < **buf) { |
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av_log(avctx, AV_LOG_ERROR, |
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"Buffer is too small for the claimed bitrate.\n"); |
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return RATE_ERRS; |
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} |
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(*buf)++; |
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*buf_size -= 1; |
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} else if ((bitrate = buf_size2bitrate(*buf_size + 1)) >= 0) { |
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av_log(avctx, AV_LOG_DEBUG, |
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"Bitrate byte is missing, guessing the bitrate from packet size.\n"); |
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} else |
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return RATE_ERRS; |
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return bitrate; |
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} |
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static void warn_insufficient_frame_quality(AVCodecContext *avctx, |
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const char *message) |
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{ |
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av_log(avctx, AV_LOG_WARNING, "Frame #%d, %s\n", |
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avctx->frame_number, message); |
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} |
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/** |
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* Initialize the speech codec according to the specification. |
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* |
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* TIA/IS-127 5.2 |
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*/ |
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static av_cold int evrc_decode_init(AVCodecContext *avctx) |
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{ |
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EVRCContext *e = avctx->priv_data; |
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int i, n, idx = 0; |
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float denom = 2.0 / (2.0 * 8.0 + 1.0); |
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avctx->channels = 1; |
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avctx->channel_layout = AV_CH_LAYOUT_MONO; |
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avctx->sample_fmt = AV_SAMPLE_FMT_FLT; |
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for (i = 0; i < FILTER_ORDER; i++) { |
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e->prev_lspf[i] = (i + 1) * 0.048; |
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e->synthesis[i] = 0.0; |
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} |
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for (i = 0; i < ACB_SIZE; i++) |
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e->pitch[i] = e->pitch_back[i] = 0.0; |
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e->last_valid_bitrate = RATE_QUANT; |
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e->prev_pitch_delay = 40.0; |
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e->fade_scale = 1.0; |
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e->prev_error_flag = 0; |
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e->avg_acb_gain = e->avg_fcb_gain = 0.0; |
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for (i = 0; i < 8; i++) { |
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float tt = ((float)i - 8.0 / 2.0) / 8.0; |
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for (n = -8; n <= 8; n++, idx++) { |
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float arg1 = M_PI * 0.9 * (tt - n); |
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float arg2 = M_PI * (tt - n); |
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e->interpolation_coeffs[idx] = 0.9; |
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if (arg1) |
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e->interpolation_coeffs[idx] *= (0.54 + 0.46 * cos(arg2 * denom)) * |
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sin(arg1) / arg1; |
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} |
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} |
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return 0; |
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} |
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/** |
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* Decode the 10 vector quantized line spectral pair frequencies from the LSP |
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* transmission codes of any bitrate and check for badly received packets. |
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* |
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* @param e the context |
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* |
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* @return 0 on success, -1 if the packet is badly received |
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* |
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* TIA/IS-127 5.2.1, 5.7.1 |
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*/ |
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static int decode_lspf(EVRCContext *e) |
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{ |
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const float * const *codebooks = evrc_lspq_codebooks[e->bitrate]; |
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int i, j, k = 0; |
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for (i = 0; i < evrc_lspq_nb_codebooks[e->bitrate]; i++) { |
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int row_size = evrc_lspq_codebooks_row_sizes[e->bitrate][i]; |
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const float *codebook = codebooks[i]; |
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for (j = 0; j < row_size; j++) |
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e->lspf[k++] = codebook[e->frame.lsp[i] * row_size + j]; |
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} |
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// check for monotonic LSPs |
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for (i = 1; i < FILTER_ORDER; i++) |
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if (e->lspf[i] <= e->lspf[i - 1]) |
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return -1; |
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// check for minimum separation of LSPs at the splits |
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for (i = 0, k = 0; i < evrc_lspq_nb_codebooks[e->bitrate] - 1; i++) { |
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k += evrc_lspq_codebooks_row_sizes[e->bitrate][i]; |
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if (e->lspf[k] - e->lspf[k - 1] <= MIN_LSP_SEP) |
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return -1; |
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} |
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return 0; |
308 |
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} |
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/* |
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* Interpolation of LSP parameters. |
312 |
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* |
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* TIA/IS-127 5.2.3.1, 5.7.3.2 |
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*/ |
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static void interpolate_lsp(float *ilsp, const float *lsp, |
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const float *prev, int index) |
317 |
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{ |
318 |
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static const float lsp_interpolation_factors[] = { 0.1667, 0.5, 0.8333 }; |
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ff_weighted_vector_sumf(ilsp, prev, lsp, |
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1.0 - lsp_interpolation_factors[index], |
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lsp_interpolation_factors[index], FILTER_ORDER); |
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} |
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/* |
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* Reconstruction of the delay contour. |
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* |
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* TIA/IS-127 5.2.2.3.2 |
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*/ |
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static void interpolate_delay(float *dst, float current, float prev, int index) |
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{ |
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static const float d_interpolation_factors[] = { 0, 0.3313, 0.6625, 1, 1 }; |
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dst[0] = (1.0 - d_interpolation_factors[index ]) * prev |
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+ d_interpolation_factors[index ] * current; |
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dst[1] = (1.0 - d_interpolation_factors[index + 1]) * prev |
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+ d_interpolation_factors[index + 1] * current; |
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dst[2] = (1.0 - d_interpolation_factors[index + 2]) * prev |
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+ d_interpolation_factors[index + 2] * current; |
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} |
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|
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/* |
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* Convert the quantized, interpolated line spectral frequencies, |
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* to prediction coefficients. |
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* |
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* TIA/IS-127 5.2.3.2, 4.7.2.2 |
345 |
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*/ |
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static void decode_predictor_coeffs(const float *ilspf, float *ilpc) |
347 |
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{ |
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double lsp[FILTER_ORDER]; |
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float a[FILTER_ORDER / 2 + 1], b[FILTER_ORDER / 2 + 1]; |
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float a1[FILTER_ORDER / 2] = { 0 }; |
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float a2[FILTER_ORDER / 2] = { 0 }; |
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float b1[FILTER_ORDER / 2] = { 0 }; |
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float b2[FILTER_ORDER / 2] = { 0 }; |
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int i, k; |
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|
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ff_acelp_lsf2lspd(lsp, ilspf, FILTER_ORDER); |
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for (k = 0; k <= FILTER_ORDER; k++) { |
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|
|
a[0] = k < 2 ? 0.25 : 0; |
360 |
|
|
b[0] = k < 2 ? k < 1 ? 0.25 : -0.25 : 0; |
361 |
|
|
|
362 |
|
|
for (i = 0; i < FILTER_ORDER / 2; i++) { |
363 |
|
|
a[i + 1] = a[i] - 2 * lsp[i * 2 ] * a1[i] + a2[i]; |
364 |
|
|
b[i + 1] = b[i] - 2 * lsp[i * 2 + 1] * b1[i] + b2[i]; |
365 |
|
|
a2[i] = a1[i]; |
366 |
|
|
a1[i] = a[i]; |
367 |
|
|
b2[i] = b1[i]; |
368 |
|
|
b1[i] = b[i]; |
369 |
|
|
} |
370 |
|
|
|
371 |
|
|
if (k) |
372 |
|
|
ilpc[k - 1] = 2.0 * (a[FILTER_ORDER / 2] + b[FILTER_ORDER / 2]); |
373 |
|
|
} |
374 |
|
|
} |
375 |
|
|
|
376 |
|
|
static void bl_intrp(EVRCContext *e, float *ex, float delay) |
377 |
|
|
{ |
378 |
|
|
float *f; |
379 |
|
|
int offset, i, coef_idx; |
380 |
|
|
int16_t t; |
381 |
|
|
|
382 |
|
|
offset = lrintf(delay); |
383 |
|
|
|
384 |
|
|
t = (offset - delay + 0.5) * 8.0 + 0.5; |
385 |
|
|
if (t == 8) { |
386 |
|
|
t = 0; |
387 |
|
|
offset--; |
388 |
|
|
} |
389 |
|
|
|
390 |
|
|
f = ex - offset - 8; |
391 |
|
|
|
392 |
|
|
coef_idx = t * (2 * 8 + 1); |
393 |
|
|
|
394 |
|
|
ex[0] = 0.0; |
395 |
|
|
for (i = 0; i < 2 * 8 + 1; i++) |
396 |
|
|
ex[0] += e->interpolation_coeffs[coef_idx + i] * f[i]; |
397 |
|
|
} |
398 |
|
|
|
399 |
|
|
/* |
400 |
|
|
* Adaptive codebook excitation. |
401 |
|
|
* |
402 |
|
|
* TIA/IS-127 5.2.2.3.3, 4.12.5.2 |
403 |
|
|
*/ |
404 |
|
|
static void acb_excitation(EVRCContext *e, float *excitation, float gain, |
405 |
|
|
const float delay[3], int length) |
406 |
|
|
{ |
407 |
|
|
float denom, locdelay, dpr, invl; |
408 |
|
|
int i; |
409 |
|
|
|
410 |
|
|
invl = 1.0 / ((float) length); |
411 |
|
|
dpr = length; |
412 |
|
|
|
413 |
|
|
/* first at-most extra samples */ |
414 |
|
|
denom = (delay[1] - delay[0]) * invl; |
415 |
|
|
for (i = 0; i < dpr; i++) { |
416 |
|
|
locdelay = delay[0] + i * denom; |
417 |
|
|
bl_intrp(e, excitation + i, locdelay); |
418 |
|
|
} |
419 |
|
|
|
420 |
|
|
denom = (delay[2] - delay[1]) * invl; |
421 |
|
|
/* interpolation */ |
422 |
|
|
for (i = dpr; i < dpr + 10; i++) { |
423 |
|
|
locdelay = delay[1] + (i - dpr) * denom; |
424 |
|
|
bl_intrp(e, excitation + i, locdelay); |
425 |
|
|
} |
426 |
|
|
|
427 |
|
|
for (i = 0; i < length; i++) |
428 |
|
|
excitation[i] *= gain; |
429 |
|
|
} |
430 |
|
|
|
431 |
|
|
static void decode_8_pulses_35bits(const uint16_t *fixed_index, float *cod) |
432 |
|
|
{ |
433 |
|
|
int i, pos1, pos2, offset; |
434 |
|
|
|
435 |
|
|
offset = (fixed_index[3] >> 9) & 3; |
436 |
|
|
|
437 |
|
|
for (i = 0; i < 3; i++) { |
438 |
|
|
pos1 = ((fixed_index[i] & 0x7f) / 11) * 5 + ((i + offset) % 5); |
439 |
|
|
pos2 = ((fixed_index[i] & 0x7f) % 11) * 5 + ((i + offset) % 5); |
440 |
|
|
|
441 |
|
|
cod[pos1] = (fixed_index[i] & 0x80) ? -1.0 : 1.0; |
442 |
|
|
|
443 |
|
|
if (pos2 < pos1) |
444 |
|
|
cod[pos2] = -cod[pos1]; |
445 |
|
|
else |
446 |
|
|
cod[pos2] += cod[pos1]; |
447 |
|
|
} |
448 |
|
|
|
449 |
|
|
pos1 = ((fixed_index[3] & 0x7f) / 11) * 5 + ((3 + offset) % 5); |
450 |
|
|
pos2 = ((fixed_index[3] & 0x7f) % 11) * 5 + ((4 + offset) % 5); |
451 |
|
|
|
452 |
|
|
cod[pos1] = (fixed_index[3] & 0x100) ? -1.0 : 1.0; |
453 |
|
|
cod[pos2] = (fixed_index[3] & 0x80 ) ? -1.0 : 1.0; |
454 |
|
|
} |
455 |
|
|
|
456 |
|
|
static void decode_3_pulses_10bits(uint16_t fixed_index, float *cod) |
457 |
|
|
{ |
458 |
|
|
float sign; |
459 |
|
|
int pos; |
460 |
|
|
|
461 |
|
|
sign = (fixed_index & 0x200) ? -1.0 : 1.0; |
462 |
|
|
|
463 |
|
|
pos = ((fixed_index & 0x7) * 7) + 4; |
464 |
|
|
cod[pos] += sign; |
465 |
|
|
pos = (((fixed_index >> 3) & 0x7) * 7) + 2; |
466 |
|
|
cod[pos] -= sign; |
467 |
|
|
pos = (((fixed_index >> 6) & 0x7) * 7); |
468 |
|
|
cod[pos] += sign; |
469 |
|
|
} |
470 |
|
|
|
471 |
|
|
/* |
472 |
|
|
* Reconstruction of ACELP fixed codebook excitation for full and half rate. |
473 |
|
|
* |
474 |
|
|
* TIA/IS-127 5.2.3.7 |
475 |
|
|
*/ |
476 |
|
|
static void fcb_excitation(EVRCContext *e, const uint16_t *codebook, |
477 |
|
|
float *excitation, float pitch_gain, |
478 |
|
|
int pitch_lag, int subframe_size) |
479 |
|
|
{ |
480 |
|
|
int i; |
481 |
|
|
|
482 |
|
|
if (e->bitrate == RATE_FULL) |
483 |
|
|
decode_8_pulses_35bits(codebook, excitation); |
484 |
|
|
else |
485 |
|
|
decode_3_pulses_10bits(*codebook, excitation); |
486 |
|
|
|
487 |
|
|
pitch_gain = av_clipf(pitch_gain, 0.2, 0.9); |
488 |
|
|
|
489 |
|
|
for (i = pitch_lag; i < subframe_size; i++) |
490 |
|
|
excitation[i] += pitch_gain * excitation[i - pitch_lag]; |
491 |
|
|
} |
492 |
|
|
|
493 |
|
|
/** |
494 |
|
|
* Synthesis of the decoder output signal. |
495 |
|
|
* |
496 |
|
|
* param[in] in input signal |
497 |
|
|
* param[in] filter_coeffs LPC coefficients |
498 |
|
|
* param[in/out] memory synthesis filter memory |
499 |
|
|
* param buffer_length amount of data to process |
500 |
|
|
* param[out] samples output samples |
501 |
|
|
* |
502 |
|
|
* TIA/IS-127 5.2.3.15, 5.7.3.4 |
503 |
|
|
*/ |
504 |
|
|
static void synthesis_filter(const float *in, const float *filter_coeffs, |
505 |
|
|
float *memory, int buffer_length, float *samples) |
506 |
|
|
{ |
507 |
|
|
int i, j; |
508 |
|
|
|
509 |
|
|
for (i = 0; i < buffer_length; i++) { |
510 |
|
|
samples[i] = in[i]; |
511 |
|
|
for (j = FILTER_ORDER - 1; j > 0; j--) { |
512 |
|
|
samples[i] -= filter_coeffs[j] * memory[j]; |
513 |
|
|
memory[j] = memory[j - 1]; |
514 |
|
|
} |
515 |
|
|
samples[i] -= filter_coeffs[0] * memory[0]; |
516 |
|
|
memory[0] = samples[i]; |
517 |
|
|
} |
518 |
|
|
} |
519 |
|
|
|
520 |
|
|
static void bandwidth_expansion(float *coeff, const float *inbuf, float gamma) |
521 |
|
|
{ |
522 |
|
|
double fac = gamma; |
523 |
|
|
int i; |
524 |
|
|
|
525 |
|
|
for (i = 0; i < FILTER_ORDER; i++) { |
526 |
|
|
coeff[i] = inbuf[i] * fac; |
527 |
|
|
fac *= gamma; |
528 |
|
|
} |
529 |
|
|
} |
530 |
|
|
|
531 |
|
|
static void residual_filter(float *output, const float *input, |
532 |
|
|
const float *coef, float *memory, int length) |
533 |
|
|
{ |
534 |
|
|
float sum; |
535 |
|
|
int i, j; |
536 |
|
|
|
537 |
|
|
for (i = 0; i < length; i++) { |
538 |
|
|
sum = input[i]; |
539 |
|
|
|
540 |
|
|
for (j = FILTER_ORDER - 1; j > 0; j--) { |
541 |
|
|
sum += coef[j] * memory[j]; |
542 |
|
|
memory[j] = memory[j - 1]; |
543 |
|
|
} |
544 |
|
|
sum += coef[0] * memory[0]; |
545 |
|
|
memory[0] = input[i]; |
546 |
|
|
output[i] = sum; |
547 |
|
|
} |
548 |
|
|
} |
549 |
|
|
|
550 |
|
|
/* |
551 |
|
|
* TIA/IS-127 Table 5.9.1-1. |
552 |
|
|
*/ |
553 |
|
|
static const struct PfCoeff { |
554 |
|
|
float tilt; |
555 |
|
|
float ltgain; |
556 |
|
|
float p1; |
557 |
|
|
float p2; |
558 |
|
|
} postfilter_coeffs[5] = { |
559 |
|
|
{ 0.0 , 0.0 , 0.0 , 0.0 }, |
560 |
|
|
{ 0.0 , 0.0 , 0.57, 0.57 }, |
561 |
|
|
{ 0.0 , 0.0 , 0.0 , 0.0 }, |
562 |
|
|
{ 0.35, 0.50, 0.50, 0.75 }, |
563 |
|
|
{ 0.20, 0.50, 0.57, 0.75 }, |
564 |
|
|
}; |
565 |
|
|
|
566 |
|
|
/* |
567 |
|
|
* Adaptive postfilter. |
568 |
|
|
* |
569 |
|
|
* TIA/IS-127 5.9 |
570 |
|
|
*/ |
571 |
|
|
static void postfilter(EVRCContext *e, float *in, const float *coeff, |
572 |
|
|
float *out, int idx, const struct PfCoeff *pfc, |
573 |
|
|
int length) |
574 |
|
|
{ |
575 |
|
|
float wcoef1[FILTER_ORDER], wcoef2[FILTER_ORDER], |
576 |
|
|
scratch[SUBFRAME_SIZE], temp[SUBFRAME_SIZE], |
577 |
|
|
mem[SUBFRAME_SIZE]; |
578 |
|
|
float sum1 = 0.0, sum2 = 0.0, gamma, gain; |
579 |
|
|
float tilt = pfc->tilt; |
580 |
|
|
int i, n, best; |
581 |
|
|
|
582 |
|
|
bandwidth_expansion(wcoef1, coeff, pfc->p1); |
583 |
|
|
bandwidth_expansion(wcoef2, coeff, pfc->p2); |
584 |
|
|
|
585 |
|
|
/* Tilt compensation filter, TIA/IS-127 5.9.1 */ |
586 |
|
|
for (i = 0; i < length - 1; i++) |
587 |
|
|
sum2 += in[i] * in[i + 1]; |
588 |
|
|
if (sum2 < 0.0) |
589 |
|
|
tilt = 0.0; |
590 |
|
|
|
591 |
|
|
for (i = 0; i < length; i++) { |
592 |
|
|
scratch[i] = in[i] - tilt * e->last; |
593 |
|
|
e->last = in[i]; |
594 |
|
|
} |
595 |
|
|
|
596 |
|
|
/* Short term residual filter, TIA/IS-127 5.9.2 */ |
597 |
|
|
residual_filter(&e->postfilter_residual[ACB_SIZE], scratch, wcoef1, e->postfilter_fir, length); |
598 |
|
|
|
599 |
|
|
/* Long term postfilter */ |
600 |
|
|
best = idx; |
601 |
|
|
for (i = FFMIN(MIN_DELAY, idx - 3); i <= FFMAX(MAX_DELAY, idx + 3); i++) { |
602 |
|
|
for (n = ACB_SIZE, sum2 = 0; n < ACB_SIZE + length; n++) |
603 |
|
|
sum2 += e->postfilter_residual[n] * e->postfilter_residual[n - i]; |
604 |
|
|
if (sum2 > sum1) { |
605 |
|
|
sum1 = sum2; |
606 |
|
|
best = i; |
607 |
|
|
} |
608 |
|
|
} |
609 |
|
|
|
610 |
|
|
for (i = ACB_SIZE, sum1 = 0; i < ACB_SIZE + length; i++) |
611 |
|
|
sum1 += e->postfilter_residual[i - best] * e->postfilter_residual[i - best]; |
612 |
|
|
for (i = ACB_SIZE, sum2 = 0; i < ACB_SIZE + length; i++) |
613 |
|
|
sum2 += e->postfilter_residual[i] * e->postfilter_residual[i - best]; |
614 |
|
|
|
615 |
|
|
if (sum2 * sum1 == 0 || e->bitrate == RATE_QUANT) { |
616 |
|
|
memcpy(temp, e->postfilter_residual + ACB_SIZE, length * sizeof(float)); |
617 |
|
|
} else { |
618 |
|
|
gamma = sum2 / sum1; |
619 |
|
|
if (gamma < 0.5) |
620 |
|
|
memcpy(temp, e->postfilter_residual + ACB_SIZE, length * sizeof(float)); |
621 |
|
|
else { |
622 |
|
|
gamma = FFMIN(gamma, 1.0); |
623 |
|
|
|
624 |
|
|
for (i = 0; i < length; i++) { |
625 |
|
|
temp[i] = e->postfilter_residual[ACB_SIZE + i] + gamma * |
626 |
|
|
pfc->ltgain * e->postfilter_residual[ACB_SIZE + i - best]; |
627 |
|
|
} |
628 |
|
|
} |
629 |
|
|
} |
630 |
|
|
|
631 |
|
|
memcpy(scratch, temp, length * sizeof(float)); |
632 |
|
|
memcpy(mem, e->postfilter_iir, FILTER_ORDER * sizeof(float)); |
633 |
|
|
synthesis_filter(scratch, wcoef2, mem, length, scratch); |
634 |
|
|
|
635 |
|
|
/* Gain computation, TIA/IS-127 5.9.4-2 */ |
636 |
|
|
for (i = 0, sum1 = 0, sum2 = 0; i < length; i++) { |
637 |
|
|
sum1 += in[i] * in[i]; |
638 |
|
|
sum2 += scratch[i] * scratch[i]; |
639 |
|
|
} |
640 |
|
|
gain = sum2 ? sqrt(sum1 / sum2) : 1.0; |
641 |
|
|
|
642 |
|
|
for (i = 0; i < length; i++) |
643 |
|
|
temp[i] *= gain; |
644 |
|
|
|
645 |
|
|
/* Short term postfilter */ |
646 |
|
|
synthesis_filter(temp, wcoef2, e->postfilter_iir, length, out); |
647 |
|
|
|
648 |
|
|
memmove(e->postfilter_residual, |
649 |
|
|
e->postfilter_residual + length, ACB_SIZE * sizeof(float)); |
650 |
|
|
} |
651 |
|
|
|
652 |
|
|
static void frame_erasure(EVRCContext *e, float *samples) |
653 |
|
|
{ |
654 |
|
|
float ilspf[FILTER_ORDER], ilpc[FILTER_ORDER], idelay[NB_SUBFRAMES], |
655 |
|
|
tmp[SUBFRAME_SIZE + 6], f; |
656 |
|
|
int i, j; |
657 |
|
|
|
658 |
|
|
for (i = 0; i < FILTER_ORDER; i++) { |
659 |
|
|
if (e->bitrate != RATE_QUANT) |
660 |
|
|
e->lspf[i] = e->prev_lspf[i] * 0.875 + 0.125 * (i + 1) * 0.048; |
661 |
|
|
else |
662 |
|
|
e->lspf[i] = e->prev_lspf[i]; |
663 |
|
|
} |
664 |
|
|
|
665 |
|
|
if (e->prev_error_flag) |
666 |
|
|
e->avg_acb_gain *= 0.75; |
667 |
|
|
if (e->bitrate == RATE_FULL) |
668 |
|
|
memcpy(e->pitch_back, e->pitch, ACB_SIZE * sizeof(float)); |
669 |
|
|
if (e->last_valid_bitrate == RATE_QUANT) |
670 |
|
|
e->bitrate = RATE_QUANT; |
671 |
|
|
else |
672 |
|
|
e->bitrate = RATE_FULL; |
673 |
|
|
|
674 |
|
|
if (e->bitrate == RATE_FULL || e->bitrate == RATE_HALF) { |
675 |
|
|
e->pitch_delay = e->prev_pitch_delay; |
676 |
|
|
} else { |
677 |
|
|
float sum = 0; |
678 |
|
|
|
679 |
|
|
idelay[0] = idelay[1] = idelay[2] = MIN_DELAY; |
680 |
|
|
|
681 |
|
|
for (i = 0; i < NB_SUBFRAMES; i++) |
682 |
|
|
sum += evrc_energy_quant[e->prev_energy_gain][i]; |
683 |
|
|
sum /= (float) NB_SUBFRAMES; |
684 |
|
|
sum = pow(10, sum); |
685 |
|
|
for (i = 0; i < NB_SUBFRAMES; i++) |
686 |
|
|
e->energy_vector[i] = sum; |
687 |
|
|
} |
688 |
|
|
|
689 |
|
|
if (fabs(e->pitch_delay - e->prev_pitch_delay) > 15) |
690 |
|
|
e->prev_pitch_delay = e->pitch_delay; |
691 |
|
|
|
692 |
|
|
for (i = 0; i < NB_SUBFRAMES; i++) { |
693 |
|
|
int subframe_size = subframe_sizes[i]; |
694 |
|
|
int pitch_lag; |
695 |
|
|
|
696 |
|
|
interpolate_lsp(ilspf, e->lspf, e->prev_lspf, i); |
697 |
|
|
|
698 |
|
|
if (e->bitrate != RATE_QUANT) { |
699 |
|
|
if (e->avg_acb_gain < 0.3) { |
700 |
|
|
idelay[0] = estimation_delay[i]; |
701 |
|
|
idelay[1] = estimation_delay[i + 1]; |
702 |
|
|
idelay[2] = estimation_delay[i + 2]; |
703 |
|
|
} else { |
704 |
|
|
interpolate_delay(idelay, e->pitch_delay, e->prev_pitch_delay, i); |
705 |
|
|
} |
706 |
|
|
} |
707 |
|
|
|
708 |
|
|
pitch_lag = lrintf((idelay[1] + idelay[0]) / 2.0); |
709 |
|
|
decode_predictor_coeffs(ilspf, ilpc); |
710 |
|
|
|
711 |
|
|
if (e->bitrate != RATE_QUANT) { |
712 |
|
|
acb_excitation(e, e->pitch + ACB_SIZE, |
713 |
|
|
e->avg_acb_gain, idelay, subframe_size); |
714 |
|
|
for (j = 0; j < subframe_size; j++) |
715 |
|
|
e->pitch[ACB_SIZE + j] *= e->fade_scale; |
716 |
|
|
e->fade_scale = FFMAX(e->fade_scale - 0.05, 0.0); |
717 |
|
|
} else { |
718 |
|
|
for (j = 0; j < subframe_size; j++) |
719 |
|
|
e->pitch[ACB_SIZE + j] = e->energy_vector[i]; |
720 |
|
|
} |
721 |
|
|
|
722 |
|
|
memmove(e->pitch, e->pitch + subframe_size, ACB_SIZE * sizeof(float)); |
723 |
|
|
|
724 |
|
|
if (e->bitrate != RATE_QUANT && e->avg_acb_gain < 0.4) { |
725 |
|
|
f = 0.1 * e->avg_fcb_gain; |
726 |
|
|
for (j = 0; j < subframe_size; j++) |
727 |
|
|
e->pitch[ACB_SIZE + j] += f; |
728 |
|
|
} else if (e->bitrate == RATE_QUANT) { |
729 |
|
|
for (j = 0; j < subframe_size; j++) |
730 |
|
|
e->pitch[ACB_SIZE + j] = e->energy_vector[i]; |
731 |
|
|
} |
732 |
|
|
|
733 |
|
|
synthesis_filter(e->pitch + ACB_SIZE, ilpc, |
734 |
|
|
e->synthesis, subframe_size, tmp); |
735 |
|
|
postfilter(e, tmp, ilpc, samples, pitch_lag, |
736 |
|
|
&postfilter_coeffs[e->bitrate], subframe_size); |
737 |
|
|
|
738 |
|
|
samples += subframe_size; |
739 |
|
|
} |
740 |
|
|
} |
741 |
|
|
|
742 |
|
|
static int evrc_decode_frame(AVCodecContext *avctx, void *data, |
743 |
|
|
int *got_frame_ptr, AVPacket *avpkt) |
744 |
|
|
{ |
745 |
|
|
const uint8_t *buf = avpkt->data; |
746 |
|
|
AVFrame *frame = data; |
747 |
|
|
EVRCContext *e = avctx->priv_data; |
748 |
|
|
int buf_size = avpkt->size; |
749 |
|
|
float ilspf[FILTER_ORDER], ilpc[FILTER_ORDER], idelay[NB_SUBFRAMES]; |
750 |
|
|
float *samples; |
751 |
|
|
int i, j, ret, error_flag = 0; |
752 |
|
|
|
753 |
|
|
frame->nb_samples = 160; |
754 |
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
755 |
|
|
return ret; |
756 |
|
|
samples = (float *)frame->data[0]; |
757 |
|
|
|
758 |
|
|
if ((e->bitrate = determine_bitrate(avctx, &buf_size, &buf)) == RATE_ERRS) { |
759 |
|
|
warn_insufficient_frame_quality(avctx, "bitrate cannot be determined."); |
760 |
|
|
goto erasure; |
761 |
|
|
} |
762 |
|
|
if (e->bitrate <= SILENCE || e->bitrate == RATE_QUARTER) |
763 |
|
|
goto erasure; |
764 |
|
|
if (e->bitrate == RATE_QUANT && e->last_valid_bitrate == RATE_FULL |
765 |
|
|
&& !e->prev_error_flag) |
766 |
|
|
goto erasure; |
767 |
|
|
|
768 |
|
|
if ((ret = init_get_bits8(&e->gb, buf, buf_size)) < 0) |
769 |
|
|
return ret; |
770 |
|
|
memset(&e->frame, 0, sizeof(EVRCAFrame)); |
771 |
|
|
|
772 |
|
|
unpack_frame(e); |
773 |
|
|
|
774 |
|
|
if (e->bitrate != RATE_QUANT) { |
775 |
|
|
uint8_t *p = (uint8_t *) &e->frame; |
776 |
|
|
for (i = 0; i < sizeof(EVRCAFrame); i++) { |
777 |
|
|
if (p[i]) |
778 |
|
|
break; |
779 |
|
|
} |
780 |
|
|
if (i == sizeof(EVRCAFrame)) |
781 |
|
|
goto erasure; |
782 |
|
|
} else if (e->frame.lsp[0] == 0xf && |
783 |
|
|
e->frame.lsp[1] == 0xf && |
784 |
|
|
e->frame.energy_gain == 0xff) { |
785 |
|
|
goto erasure; |
786 |
|
|
} |
787 |
|
|
|
788 |
|
|
if (decode_lspf(e) < 0) |
789 |
|
|
goto erasure; |
790 |
|
|
|
791 |
|
|
if (e->bitrate == RATE_FULL || e->bitrate == RATE_HALF) { |
792 |
|
|
/* Pitch delay parameter checking as per TIA/IS-127 5.1.5.1 */ |
793 |
|
|
if (e->frame.pitch_delay > MAX_DELAY - MIN_DELAY) |
794 |
|
|
goto erasure; |
795 |
|
|
|
796 |
|
|
e->pitch_delay = e->frame.pitch_delay + MIN_DELAY; |
797 |
|
|
|
798 |
|
|
/* Delay diff parameter checking as per TIA/IS-127 5.1.5.2 */ |
799 |
|
|
if (e->frame.delay_diff) { |
800 |
|
|
int p = e->pitch_delay - e->frame.delay_diff + 16; |
801 |
|
|
if (p < MIN_DELAY || p > MAX_DELAY) |
802 |
|
|
goto erasure; |
803 |
|
|
} |
804 |
|
|
|
805 |
|
|
/* Delay contour reconstruction as per TIA/IS-127 5.2.2.2 */ |
806 |
|
|
if (e->frame.delay_diff && |
807 |
|
|
e->bitrate == RATE_FULL && e->prev_error_flag) { |
808 |
|
|
float delay; |
809 |
|
|
|
810 |
|
|
memcpy(e->pitch, e->pitch_back, ACB_SIZE * sizeof(float)); |
811 |
|
|
|
812 |
|
|
delay = e->prev_pitch_delay; |
813 |
|
|
e->prev_pitch_delay = delay - e->frame.delay_diff + 16.0; |
814 |
|
|
|
815 |
|
|
if (fabs(e->pitch_delay - delay) > 15) |
816 |
|
|
delay = e->pitch_delay; |
817 |
|
|
|
818 |
|
|
for (i = 0; i < NB_SUBFRAMES; i++) { |
819 |
|
|
int subframe_size = subframe_sizes[i]; |
820 |
|
|
|
821 |
|
|
interpolate_delay(idelay, delay, e->prev_pitch_delay, i); |
822 |
|
|
acb_excitation(e, e->pitch + ACB_SIZE, e->avg_acb_gain, idelay, subframe_size); |
823 |
|
|
memmove(e->pitch, e->pitch + subframe_size, ACB_SIZE * sizeof(float)); |
824 |
|
|
} |
825 |
|
|
} |
826 |
|
|
|
827 |
|
|
/* Smoothing of the decoded delay as per TIA/IS-127 5.2.2.5 */ |
828 |
|
|
if (fabs(e->pitch_delay - e->prev_pitch_delay) > 15) |
829 |
|
|
e->prev_pitch_delay = e->pitch_delay; |
830 |
|
|
|
831 |
|
|
e->avg_acb_gain = e->avg_fcb_gain = 0.0; |
832 |
|
|
} else { |
833 |
|
|
idelay[0] = idelay[1] = idelay[2] = MIN_DELAY; |
834 |
|
|
|
835 |
|
|
/* Decode frame energy vectors as per TIA/IS-127 5.7.2 */ |
836 |
|
|
for (i = 0; i < NB_SUBFRAMES; i++) |
837 |
|
|
e->energy_vector[i] = pow(10, evrc_energy_quant[e->frame.energy_gain][i]); |
838 |
|
|
e->prev_energy_gain = e->frame.energy_gain; |
839 |
|
|
} |
840 |
|
|
|
841 |
|
|
for (i = 0; i < NB_SUBFRAMES; i++) { |
842 |
|
|
float tmp[SUBFRAME_SIZE + 6] = { 0 }; |
843 |
|
|
int subframe_size = subframe_sizes[i]; |
844 |
|
|
int pitch_lag; |
845 |
|
|
|
846 |
|
|
interpolate_lsp(ilspf, e->lspf, e->prev_lspf, i); |
847 |
|
|
|
848 |
|
|
if (e->bitrate != RATE_QUANT) |
849 |
|
|
interpolate_delay(idelay, e->pitch_delay, e->prev_pitch_delay, i); |
850 |
|
|
|
851 |
|
|
pitch_lag = lrintf((idelay[1] + idelay[0]) / 2.0); |
852 |
|
|
decode_predictor_coeffs(ilspf, ilpc); |
853 |
|
|
|
854 |
|
|
/* Bandwidth expansion as per TIA/IS-127 5.2.3.3 */ |
855 |
|
|
if (e->frame.lpc_flag && e->prev_error_flag) |
856 |
|
|
bandwidth_expansion(ilpc, ilpc, 0.75); |
857 |
|
|
|
858 |
|
|
if (e->bitrate != RATE_QUANT) { |
859 |
|
|
float acb_sum, f; |
860 |
|
|
|
861 |
|
|
f = exp((e->bitrate == RATE_HALF ? 0.5 : 0.25) |
862 |
|
|
* (e->frame.fcb_gain[i] + 1)); |
863 |
|
|
acb_sum = pitch_gain_vq[e->frame.acb_gain[i]]; |
864 |
|
|
e->avg_acb_gain += acb_sum / NB_SUBFRAMES; |
865 |
|
|
e->avg_fcb_gain += f / NB_SUBFRAMES; |
866 |
|
|
|
867 |
|
|
acb_excitation(e, e->pitch + ACB_SIZE, |
868 |
|
|
acb_sum, idelay, subframe_size); |
869 |
|
|
fcb_excitation(e, e->frame.fcb_shape[i], tmp, |
870 |
|
|
acb_sum, pitch_lag, subframe_size); |
871 |
|
|
|
872 |
|
|
/* Total excitation generation as per TIA/IS-127 5.2.3.9 */ |
873 |
|
|
for (j = 0; j < subframe_size; j++) |
874 |
|
|
e->pitch[ACB_SIZE + j] += f * tmp[j]; |
875 |
|
|
e->fade_scale = FFMIN(e->fade_scale + 0.2, 1.0); |
876 |
|
|
} else { |
877 |
|
|
for (j = 0; j < subframe_size; j++) |
878 |
|
|
e->pitch[ACB_SIZE + j] = e->energy_vector[i]; |
879 |
|
|
} |
880 |
|
|
|
881 |
|
|
memmove(e->pitch, e->pitch + subframe_size, ACB_SIZE * sizeof(float)); |
882 |
|
|
|
883 |
|
|
synthesis_filter(e->pitch + ACB_SIZE, ilpc, |
884 |
|
|
e->synthesis, subframe_size, |
885 |
|
|
e->postfilter ? tmp : samples); |
886 |
|
|
if (e->postfilter) |
887 |
|
|
postfilter(e, tmp, ilpc, samples, pitch_lag, |
888 |
|
|
&postfilter_coeffs[e->bitrate], subframe_size); |
889 |
|
|
|
890 |
|
|
samples += subframe_size; |
891 |
|
|
} |
892 |
|
|
|
893 |
|
|
if (error_flag) { |
894 |
|
|
erasure: |
895 |
|
|
error_flag = 1; |
896 |
|
|
av_log(avctx, AV_LOG_WARNING, "frame erasure\n"); |
897 |
|
|
frame_erasure(e, samples); |
898 |
|
|
} |
899 |
|
|
|
900 |
|
|
memcpy(e->prev_lspf, e->lspf, sizeof(e->prev_lspf)); |
901 |
|
|
e->prev_error_flag = error_flag; |
902 |
|
|
e->last_valid_bitrate = e->bitrate; |
903 |
|
|
|
904 |
|
|
if (e->bitrate != RATE_QUANT) |
905 |
|
|
e->prev_pitch_delay = e->pitch_delay; |
906 |
|
|
|
907 |
|
|
samples = (float *)frame->data[0]; |
908 |
|
|
for (i = 0; i < 160; i++) |
909 |
|
|
samples[i] /= 32768; |
910 |
|
|
|
911 |
|
|
*got_frame_ptr = 1; |
912 |
|
|
|
913 |
|
|
return avpkt->size; |
914 |
|
|
} |
915 |
|
|
|
916 |
|
|
#define OFFSET(x) offsetof(EVRCContext, x) |
917 |
|
|
#define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM |
918 |
|
|
|
919 |
|
|
static const AVOption options[] = { |
920 |
|
|
{ "postfilter", "enable postfilter", OFFSET(postfilter), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AD }, |
921 |
|
|
{ NULL } |
922 |
|
|
}; |
923 |
|
|
|
924 |
|
|
static const AVClass evrcdec_class = { |
925 |
|
|
.class_name = "evrc", |
926 |
|
|
.item_name = av_default_item_name, |
927 |
|
|
.option = options, |
928 |
|
|
.version = LIBAVUTIL_VERSION_INT, |
929 |
|
|
}; |
930 |
|
|
|
931 |
|
|
AVCodec ff_evrc_decoder = { |
932 |
|
|
.name = "evrc", |
933 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("EVRC (Enhanced Variable Rate Codec)"), |
934 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
935 |
|
|
.id = AV_CODEC_ID_EVRC, |
936 |
|
|
.init = evrc_decode_init, |
937 |
|
|
.decode = evrc_decode_frame, |
938 |
|
|
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF, |
939 |
|
|
.priv_data_size = sizeof(EVRCContext), |
940 |
|
|
.priv_class = &evrcdec_class, |
941 |
|
|
}; |