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@ -1,5 +1,5 @@ |
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/*
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* G.722 ADPCM audio decoder |
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* G.722 ADPCM audio encoder/decoder |
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* |
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* Copyright (c) CMU 1993 Computer Science, Speech Group |
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* Chengxiang Lu and Alex Hauptmann |
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@ -219,6 +219,7 @@ static av_cold int g722_init(AVCodecContext * avctx) |
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return 0; |
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} |
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#if CONFIG_ADPCM_G722_DECODER |
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static const int16_t low_inv_quant5[32] = { |
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-35, -35, -2919, -2195, -1765, -1458, -1219, -1023, |
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-858, -714, -587, -473, -370, -276, -190, -110, |
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@ -301,4 +302,84 @@ AVCodec adpcm_g722_decoder = { |
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.long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), |
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.max_lowres = 1, |
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}; |
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#endif |
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#if CONFIG_ADPCM_G722_ENCODER |
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static const int16_t low_quant[33] = { |
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35, 72, 110, 150, 190, 233, 276, 323, |
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370, 422, 473, 530, 587, 650, 714, 786, |
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858, 940, 1023, 1121, 1219, 1339, 1458, 1612, |
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1765, 1980, 2195, 2557, 2919 |
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}; |
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static inline void filter_samples(G722Context *c, const int16_t *samples, |
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int *xlow, int *xhigh) |
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{ |
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int xout1, xout2; |
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c->prev_samples[c->prev_samples_pos++] = samples[0]; |
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c->prev_samples[c->prev_samples_pos++] = samples[1]; |
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apply_qmf(c->prev_samples + c->prev_samples_pos - 24, &xout1, &xout2); |
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*xlow = xout1 + xout2 >> 13; |
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*xhigh = xout1 - xout2 >> 13; |
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if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) { |
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memmove(c->prev_samples, |
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c->prev_samples + c->prev_samples_pos - 22, |
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22 * sizeof(c->prev_samples[0])); |
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c->prev_samples_pos = 22; |
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} |
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} |
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static inline int encode_high(const struct G722Band *state, int xhigh) |
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{ |
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int diff = av_clip_int16(xhigh - state->s_predictor); |
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int pred = 141 * state->scale_factor >> 8; |
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/* = diff >= 0 ? (diff < pred) + 2 : diff >= -pred */ |
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return ((diff ^ (diff >> (sizeof(diff)*8-1))) < pred) + 2*(diff >= 0); |
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} |
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static inline int encode_low(const struct G722Band* state, int xlow) |
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{ |
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int diff = av_clip_int16(xlow - state->s_predictor); |
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/* = diff >= 0 ? diff : -(diff + 1) */ |
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int limit = diff ^ (diff >> (sizeof(diff)*8-1)); |
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int i = 0; |
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limit = limit + 1 << 10; |
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if (limit > low_quant[8] * state->scale_factor) |
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i = 9; |
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while (i < 29 && limit > low_quant[i] * state->scale_factor) |
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i++; |
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return (diff < 0 ? (i < 2 ? 63 : 33) : 61) - i; |
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} |
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static int g722_encode_frame(AVCodecContext *avctx, |
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uint8_t *dst, int buf_size, void *data) |
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{ |
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G722Context *c = avctx->priv_data; |
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const int16_t *samples = data; |
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int i; |
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for (i = 0; i < buf_size >> 1; i++) { |
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int xlow, xhigh, ihigh, ilow; |
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filter_samples(c, &samples[2*i], &xlow, &xhigh); |
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ihigh = encode_high(&c->band[1], xhigh); |
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ilow = encode_low(&c->band[0], xlow); |
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update_high_predictor(&c->band[1], c->band[1].scale_factor * |
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high_inv_quant[ihigh] >> 10, ihigh); |
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update_low_predictor(&c->band[0], ilow >> 2); |
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*dst++ = ihigh << 6 | ilow; |
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} |
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return i; |
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} |
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AVCodec adpcm_g722_encoder = { |
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.name = "g722", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = CODEC_ID_ADPCM_G722, |
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.priv_data_size = sizeof(G722Context), |
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.init = g722_init, |
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.encode = g722_encode_frame, |
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.long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), |
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.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, |
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}; |
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#endif |
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