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Fixed-codebook vector decoding
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@ -249,6 +249,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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int pitch_delay_int; // pitch delay, integer part
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int pitch_delay_int; // pitch delay, integer part
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int pitch_delay_3x; // pitch delay, multiplied by 3
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int pitch_delay_3x; // pitch delay, multiplied by 3
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int16_t fc[SUBFRAME_SIZE]; // fixed-codebook vector
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if (*data_size < SUBFRAME_SIZE << 2) {
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if (*data_size < SUBFRAME_SIZE << 2) {
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av_log(avctx, AV_LOG_ERROR, "Error processing packet: output buffer too small\n");
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av_log(avctx, AV_LOG_ERROR, "Error processing packet: output buffer too small\n");
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@ -335,6 +336,28 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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/* Round pitch delay to nearest (used everywhere except ff_acelp_interpolate). */
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/* Round pitch delay to nearest (used everywhere except ff_acelp_interpolate). */
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pitch_delay_int = (pitch_delay_3x + 1) / 3;
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pitch_delay_int = (pitch_delay_3x + 1) / 3;
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memset(fc, 0, sizeof(int16_t) * SUBFRAME_SIZE);
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switch (packet_type) {
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case FORMAT_G729_8K:
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ff_acelp_fc_pulse_per_track(fc, ff_fc_4pulses_8bits_tracks_13,
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ff_fc_4pulses_8bits_track_4,
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fc_indexes, pulses_signs, 3, 3);
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break;
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case FORMAT_G729D_6K4:
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ff_acelp_fc_pulse_per_track(fc, ff_fc_2pulses_9bits_track1_gray,
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ff_fc_2pulses_9bits_track2_gray,
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fc_indexes, pulses_signs, 1, 4);
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break;
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}
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/*
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This filter enhances harmonic components of the fixed-codebook vector to
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improve the quality of the reconstructed speech.
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/ fc_v[i], i < pitch_delay
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fc_v[i] = <
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\ fc_v[i] + gain_pitch * fc_v[i-pitch_delay], i >= pitch_delay
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*/
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ff_acelp_weighted_vector_sum(fc + pitch_delay_int,
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ff_acelp_weighted_vector_sum(fc + pitch_delay_int,
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fc + pitch_delay_int,
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fc + pitch_delay_int,
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fc, 1 << 14,
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fc, 1 << 14,
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