| @@ -1,5 +1,5 @@ |
| 1 | 1 | /* |
| 2 | | − * G.722 ADPCM audio decoder |
| 2 | + * G.722 ADPCM audio encoder/decoder |
| 3 | 3 | * |
| 4 | 4 | * Copyright (c) CMU 1993 Computer Science, Speech Group |
| 5 | 5 | * Chengxiang Lu and Alex Hauptmann |
| @@ -219,6 +219,7 @@ static av_cold int g722_init(AVCodecContext * avctx) · 213 unmodified lines |
| 219 | 219 | return 0; |
| 220 | 220 | } |
| 221 | 221 | |
| 222 | +#if CONFIG_ADPCM_G722_DECODER |
| 222 | 223 | static const int16_t low_inv_quant5[32] = { |
| 223 | 224 | -35, -35, -2919, -2195, -1765, -1458, -1219, -1023, |
| 224 | 225 | -858, -714, -587, -473, -370, -276, -190, -110, |
| @@ -301,4 +302,84 @@ AVCodec adpcm_g722_decoder = { · 76 unmodified lines |
| 301 | 302 | .long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), |
| 302 | 303 | .max_lowres = 1, |
| 303 | 304 | }; |
| 305 | +#endif |
| 306 | + |
| 307 | +#if CONFIG_ADPCM_G722_ENCODER |
| 308 | +static const int16_t low_quant[33] = { |
| 309 | + 35, 72, 110, 150, 190, 233, 276, 323, |
| 310 | + 370, 422, 473, 530, 587, 650, 714, 786, |
| 311 | + 858, 940, 1023, 1121, 1219, 1339, 1458, 1612, |
| 312 | + 1765, 1980, 2195, 2557, 2919 |
| 313 | +}; |
| 314 | + |
| 315 | +static inline void filter_samples(G722Context *c, const int16_t *samples, |
| 316 | + int *xlow, int *xhigh) |
| 317 | +{ |
| 318 | + int xout1, xout2; |
| 319 | + c->prev_samples[c->prev_samples_pos++] = samples[0]; |
| 320 | + c->prev_samples[c->prev_samples_pos++] = samples[1]; |
| 321 | + apply_qmf(c->prev_samples + c->prev_samples_pos - 24, &xout1, &xout2); |
| 322 | + *xlow = xout1 + xout2 >> 13; |
| 323 | + *xhigh = xout1 - xout2 >> 13; |
| 324 | + if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) { |
| 325 | + memmove(c->prev_samples, |
| 326 | + c->prev_samples + c->prev_samples_pos - 22, |
| 327 | + 22 * sizeof(c->prev_samples[0])); |
| 328 | + c->prev_samples_pos = 22; |
| 329 | + } |
| 330 | +} |
| 331 | + |
| 332 | +static inline int encode_high(const struct G722Band *state, int xhigh) |
| 333 | +{ |
| 334 | + int diff = av_clip_int16(xhigh - state->s_predictor); |
| 335 | + int pred = 141 * state->scale_factor >> 8; |
| 336 | + /* = diff >= 0 ? (diff < pred) + 2 : diff >= -pred */ |
| 337 | + return ((diff ^ (diff >> (sizeof(diff)*8-1))) < pred) + 2*(diff >= 0); |
| 338 | +} |
| 339 | + |
| 340 | +static inline int encode_low(const struct G722Band* state, int xlow) |
| 341 | +{ |
| 342 | + int diff = av_clip_int16(xlow - state->s_predictor); |
| 343 | + /* = diff >= 0 ? diff : -(diff + 1) */ |
| 344 | + int limit = diff ^ (diff >> (sizeof(diff)*8-1)); |
| 345 | + int i = 0; |
| 346 | + limit = limit + 1 << 10; |
| 347 | + if (limit > low_quant[8] * state->scale_factor) |
| 348 | + i = 9; |
| 349 | + while (i < 29 && limit > low_quant[i] * state->scale_factor) |
| 350 | + i++; |
| 351 | + return (diff < 0 ? (i < 2 ? 63 : 33) : 61) - i; |
| 352 | +} |
| 353 | + |
| 354 | +static int g722_encode_frame(AVCodecContext *avctx, |
| 355 | + uint8_t *dst, int buf_size, void *data) |
| 356 | +{ |
| 357 | + G722Context *c = avctx->priv_data; |
| 358 | + const int16_t *samples = data; |
| 359 | + int i; |
| 360 | + |
| 361 | + for (i = 0; i < buf_size >> 1; i++) { |
| 362 | + int xlow, xhigh, ihigh, ilow; |
| 363 | + filter_samples(c, &samples[2*i], &xlow, &xhigh); |
| 364 | + ihigh = encode_high(&c->band[1], xhigh); |
| 365 | + ilow = encode_low(&c->band[0], xlow); |
| 366 | + update_high_predictor(&c->band[1], c->band[1].scale_factor * |
| 367 | + high_inv_quant[ihigh] >> 10, ihigh); |
| 368 | + update_low_predictor(&c->band[0], ilow >> 2); |
| 369 | + *dst++ = ihigh << 6 | ilow; |
| 370 | + } |
| 371 | + return i; |
| 372 | +} |
| 373 | + |
| 374 | +AVCodec adpcm_g722_encoder = { |
| 375 | + .name = "g722", |
| 376 | + .type = AVMEDIA_TYPE_AUDIO, |
| 377 | + .id = CODEC_ID_ADPCM_G722, |
| 378 | + .priv_data_size = sizeof(G722Context), |
| 379 | + .init = g722_init, |
| 380 | + .encode = g722_encode_frame, |
| 381 | + .long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), |
| 382 | + .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, |
| 383 | +}; |
| 384 | +#endif |
| 304 | 385 | |