| @@ -1,5 +1,5 @@ |
| 1 | /* | 1 | /* |
| 2 | * G.722 ADPCM audio decoder | 2 | * G.722 ADPCM audio encoder/decoder |
| 3 | * | 3 | * |
| 4 | * Copyright (c) CMU 1993 Computer Science, Speech Group | 4 | * Copyright (c) CMU 1993 Computer Science, Speech Group |
| 5 | * Chengxiang Lu and Alex Hauptmann | 5 | * Chengxiang Lu and Alex Hauptmann |
| @@ -219,6 +219,7 @@ static av_cold int g722_init(AVCodecContext * avctx) · 213 unmodified lines |
| 219 | return 0; | 219 | return 0; |
| 220 | } | 220 | } |
| 221 | | 221 | |
| | 222 | #if CONFIG_ADPCM_G722_DECODER |
| 222 | static const int16_t low_inv_quant5[32] = { | 223 | static const int16_t low_inv_quant5[32] = { |
| 223 | -35, -35, -2919, -2195, -1765, -1458, -1219, -1023, | 224 | -35, -35, -2919, -2195, -1765, -1458, -1219, -1023, |
| 224 | -858, -714, -587, -473, -370, -276, -190, -110, | 225 | -858, -714, -587, -473, -370, -276, -190, -110, |
| @@ -301,4 +302,84 @@ AVCodec adpcm_g722_decoder = { · 76 unmodified lines |
| 301 | .long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), | 302 | .long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), |
| 302 | .max_lowres = 1, | 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 | |