| 1 | /* |
| 2 | * RealAudio Lossless decoder |
| 3 | * |
| 4 | * Copyright (c) 2012 Konstantin Shishkov |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | /** |
| 24 | * @file |
| 25 | * This is a decoder for Real Audio Lossless format. |
| 26 | * Dedicated to the mastermind behind it, Ralph Wiggum. |
| 27 | */ |
| 28 | |
| 29 | #include "libavutil/attributes.h" |
| 30 | #include "libavutil/channel_layout.h" |
| 31 | #include "avcodec.h" |
| 32 | #include "get_bits.h" |
| 33 | #include "golomb.h" |
| 34 | #include "internal.h" |
| 35 | #include "unary.h" |
| 36 | #include "ralfdata.h" |
| 37 | |
| 38 | #define FILTER_NONE 0 |
| 39 | #define FILTER_RAW 642 |
| 40 | |
| 41 | typedef struct VLCSet { |
| 42 | VLC filter_params; |
| 43 | VLC bias; |
| 44 | VLC coding_mode; |
| 45 | VLC filter_coeffs[10][11]; |
| 46 | VLC short_codes[15]; |
| 47 | VLC long_codes[125]; |
| 48 | } VLCSet; |
| 49 | |
| 50 | #define RALF_MAX_PKT_SIZE 8192 |
| 51 | |
| 52 | typedef struct RALFContext { |
| 53 | int version; |
| 54 | int max_frame_size; |
| 55 | VLCSet sets[3]; |
| 56 | int32_t channel_data[2][4096]; |
| 57 | |
| 58 | int filter_params; ///< combined filter parameters for the current channel data |
| 59 | int filter_length; ///< length of the filter for the current channel data |
| 60 | int filter_bits; ///< filter precision for the current channel data |
| 61 | int32_t filter[64]; |
| 62 | |
| 63 | int bias[2]; ///< a constant value added to channel data after filtering |
| 64 | |
| 65 | int num_blocks; ///< number of blocks inside the frame |
| 66 | int sample_offset; |
| 67 | int block_size[1 << 12]; ///< size of the blocks |
| 68 | int block_pts[1 << 12]; ///< block start time (in milliseconds) |
| 69 | |
| 70 | uint8_t pkt[16384]; |
| 71 | int has_pkt; |
| 72 | } RALFContext; |
| 73 | |
| 74 | #define MAX_ELEMS 644 // no RALF table uses more than that |
| 75 | |
| 76 | static av_cold int init_ralf_vlc(VLC *vlc, const uint8_t *data, int elems) |
| 77 | { |
| 78 | uint8_t lens[MAX_ELEMS]; |
| 79 | uint16_t codes[MAX_ELEMS]; |
| 80 | int counts[17], prefixes[18]; |
| 81 | int i, cur_len; |
| 82 | int max_bits = 0; |
| 83 | int nb = 0; |
| 84 | |
| 85 | for (i = 0; i <= 16; i++) |
| 86 | counts[i] = 0; |
| 87 | for (i = 0; i < elems; i++) { |
| 88 | cur_len = (nb ? *data & 0xF : *data >> 4) + 1; |
| 89 | counts[cur_len]++; |
| 90 | max_bits = FFMAX(max_bits, cur_len); |
| 91 | lens[i] = cur_len; |
| 92 | data += nb; |
| 93 | nb ^= 1; |
| 94 | } |
| 95 | prefixes[1] = 0; |
| 96 | for (i = 1; i <= 16; i++) |
| 97 | prefixes[i + 1] = (prefixes[i] + counts[i]) << 1; |
| 98 | |
| 99 | for (i = 0; i < elems; i++) |
| 100 | codes[i] = prefixes[lens[i]]++; |
| 101 | |
| 102 | return ff_init_vlc_sparse(vlc, FFMIN(max_bits, 9), elems, |
| 103 | lens, 1, 1, codes, 2, 2, NULL, 0, 0, 0); |
| 104 | } |
| 105 | |
| 106 | static av_cold int decode_close(AVCodecContext *avctx) |
| 107 | { |
| 108 | RALFContext *ctx = avctx->priv_data; |
| 109 | int i, j, k; |
| 110 | |
| 111 | for (i = 0; i < 3; i++) { |
| 112 | ff_free_vlc(&ctx->sets[i].filter_params); |
| 113 | ff_free_vlc(&ctx->sets[i].bias); |
| 114 | ff_free_vlc(&ctx->sets[i].coding_mode); |
| 115 | for (j = 0; j < 10; j++) |
| 116 | for (k = 0; k < 11; k++) |
| 117 | ff_free_vlc(&ctx->sets[i].filter_coeffs[j][k]); |
| 118 | for (j = 0; j < 15; j++) |
| 119 | ff_free_vlc(&ctx->sets[i].short_codes[j]); |
| 120 | for (j = 0; j < 125; j++) |
| 121 | ff_free_vlc(&ctx->sets[i].long_codes[j]); |
| 122 | } |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | static av_cold int decode_init(AVCodecContext *avctx) |
| 128 | { |
| 129 | RALFContext *ctx = avctx->priv_data; |
| 130 | int i, j, k; |
| 131 | int ret; |
| 132 | |
| 133 | if (avctx->extradata_size < 24 || memcmp(avctx->extradata, "LSD:", 4)) { |
| 134 | av_log(avctx, AV_LOG_ERROR, "Extradata is not groovy, dude\n"); |
| 135 | return AVERROR_INVALIDDATA; |
| 136 | } |
| 137 | |
| 138 | ctx->version = AV_RB16(avctx->extradata + 4); |
| 139 | if (ctx->version != 0x103) { |
| 140 | avpriv_request_sample(avctx, "Unknown version %X", ctx->version); |
| 141 | return AVERROR_PATCHWELCOME; |
| 142 | } |
| 143 | |
| 144 | avctx->channels = AV_RB16(avctx->extradata + 8); |
| 145 | avctx->sample_rate = AV_RB32(avctx->extradata + 12); |
| 146 | if (avctx->channels < 1 || avctx->channels > 2 |
| 147 | || avctx->sample_rate < 8000 || avctx->sample_rate > 96000) { |
| 148 | av_log(avctx, AV_LOG_ERROR, "Invalid coding parameters %d Hz %d ch\n", |
| 149 | avctx->sample_rate, avctx->channels); |
| 150 | return AVERROR_INVALIDDATA; |
| 151 | } |
| 152 | avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
| 153 | avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO |
| 154 | : AV_CH_LAYOUT_MONO; |
| 155 | |
| 156 | ctx->max_frame_size = AV_RB32(avctx->extradata + 16); |
| 157 | if (ctx->max_frame_size > (1 << 20) || !ctx->max_frame_size) { |
| 158 | av_log(avctx, AV_LOG_ERROR, "invalid frame size %d\n", |
| 159 | ctx->max_frame_size); |
| 160 | } |
| 161 | ctx->max_frame_size = FFMAX(ctx->max_frame_size, avctx->sample_rate); |
| 162 | |
| 163 | for (i = 0; i < 3; i++) { |
| 164 | ret = init_ralf_vlc(&ctx->sets[i].filter_params, filter_param_def[i], |
| 165 | FILTERPARAM_ELEMENTS); |
| 166 | if (ret < 0) { |
| 167 | decode_close(avctx); |
| 168 | return ret; |
| 169 | } |
| 170 | ret = init_ralf_vlc(&ctx->sets[i].bias, bias_def[i], BIAS_ELEMENTS); |
| 171 | if (ret < 0) { |
| 172 | decode_close(avctx); |
| 173 | return ret; |
| 174 | } |
| 175 | ret = init_ralf_vlc(&ctx->sets[i].coding_mode, coding_mode_def[i], |
| 176 | CODING_MODE_ELEMENTS); |
| 177 | if (ret < 0) { |
| 178 | decode_close(avctx); |
| 179 | return ret; |
| 180 | } |
| 181 | for (j = 0; j < 10; j++) { |
| 182 | for (k = 0; k < 11; k++) { |
| 183 | ret = init_ralf_vlc(&ctx->sets[i].filter_coeffs[j][k], |
| 184 | filter_coeffs_def[i][j][k], |
| 185 | FILTER_COEFFS_ELEMENTS); |
| 186 | if (ret < 0) { |
| 187 | decode_close(avctx); |
| 188 | return ret; |
| 189 | } |
| 190 | } |
| 191 | } |
| 192 | for (j = 0; j < 15; j++) { |
| 193 | ret = init_ralf_vlc(&ctx->sets[i].short_codes[j], |
| 194 | short_codes_def[i][j], SHORT_CODES_ELEMENTS); |
| 195 | if (ret < 0) { |
| 196 | decode_close(avctx); |
| 197 | return ret; |
| 198 | } |
| 199 | } |
| 200 | for (j = 0; j < 125; j++) { |
| 201 | ret = init_ralf_vlc(&ctx->sets[i].long_codes[j], |
| 202 | long_codes_def[i][j], LONG_CODES_ELEMENTS); |
| 203 | if (ret < 0) { |
| 204 | decode_close(avctx); |
| 205 | return ret; |
| 206 | } |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | static inline int extend_code(GetBitContext *gb, int val, int range, int bits) |
| 214 | { |
| 215 | if (val == 0) { |
| 216 | val = -range - get_ue_golomb(gb); |
| 217 | } else if (val == range * 2) { |
| 218 | val = range + get_ue_golomb(gb); |
| 219 | } else { |
| 220 | val -= range; |
| 221 | } |
| 222 | if (bits) |
| 223 | val = (val << bits) | get_bits(gb, bits); |
| 224 | return val; |
| 225 | } |
| 226 | |
| 227 | static int decode_channel(RALFContext *ctx, GetBitContext *gb, int ch, |
| 228 | int length, int mode, int bits) |
| 229 | { |
| 230 | int i, t; |
| 231 | int code_params; |
| 232 | VLCSet *set = ctx->sets + mode; |
| 233 | VLC *code_vlc; int range, range2, add_bits; |
| 234 | int *dst = ctx->channel_data[ch]; |
| 235 | |
| 236 | ctx->filter_params = get_vlc2(gb, set->filter_params.table, 9, 2); |
| 237 | ctx->filter_bits = (ctx->filter_params - 2) >> 6; |
| 238 | ctx->filter_length = ctx->filter_params - (ctx->filter_bits << 6) - 1; |
| 239 | |
| 240 | if (ctx->filter_params == FILTER_RAW) { |
| 241 | for (i = 0; i < length; i++) |
| 242 | dst[i] = get_bits(gb, bits); |
| 243 | ctx->bias[ch] = 0; |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | ctx->bias[ch] = get_vlc2(gb, set->bias.table, 9, 2); |
| 248 | ctx->bias[ch] = extend_code(gb, ctx->bias[ch], 127, 4); |
| 249 | |
| 250 | if (ctx->filter_params == FILTER_NONE) { |
| 251 | memset(dst, 0, sizeof(*dst) * length); |
| 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | if (ctx->filter_params > 1) { |
| 256 | int cmode = 0, coeff = 0; |
| 257 | VLC *vlc = set->filter_coeffs[ctx->filter_bits] + 5; |
| 258 | |
| 259 | add_bits = ctx->filter_bits; |
| 260 | |
| 261 | for (i = 0; i < ctx->filter_length; i++) { |
| 262 | t = get_vlc2(gb, vlc[cmode].table, vlc[cmode].bits, 2); |
| 263 | t = extend_code(gb, t, 21, add_bits); |
| 264 | if (!cmode) |
| 265 | coeff -= 12 << add_bits; |
| 266 | coeff = t - coeff; |
| 267 | ctx->filter[i] = coeff; |
| 268 | |
| 269 | cmode = coeff >> add_bits; |
| 270 | if (cmode < 0) { |
| 271 | cmode = -1 - av_log2(-cmode); |
| 272 | if (cmode < -5) |
| 273 | cmode = -5; |
| 274 | } else if (cmode > 0) { |
| 275 | cmode = 1 + av_log2(cmode); |
| 276 | if (cmode > 5) |
| 277 | cmode = 5; |
| 278 | } |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | code_params = get_vlc2(gb, set->coding_mode.table, set->coding_mode.bits, 2); |
| 283 | if (code_params >= 15) { |
| 284 | add_bits = av_clip((code_params / 5 - 3) / 2, 0, 10); |
| 285 | if (add_bits > 9 && (code_params % 5) != 2) |
| 286 | add_bits--; |
| 287 | range = 10; |
| 288 | range2 = 21; |
| 289 | code_vlc = set->long_codes + code_params - 15; |
| 290 | } else { |
| 291 | add_bits = 0; |
| 292 | range = 6; |
| 293 | range2 = 13; |
| 294 | code_vlc = set->short_codes + code_params; |
| 295 | } |
| 296 | |
| 297 | for (i = 0; i < length; i += 2) { |
| 298 | int code1, code2; |
| 299 | |
| 300 | t = get_vlc2(gb, code_vlc->table, code_vlc->bits, 2); |
| 301 | code1 = t / range2; |
| 302 | code2 = t % range2; |
| 303 | dst[i] = extend_code(gb, code1, range, 0) << add_bits; |
| 304 | dst[i + 1] = extend_code(gb, code2, range, 0) << add_bits; |
| 305 | if (add_bits) { |
| 306 | dst[i] |= get_bits(gb, add_bits); |
| 307 | dst[i + 1] |= get_bits(gb, add_bits); |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | static void apply_lpc(RALFContext *ctx, int ch, int length, int bits) |
| 315 | { |
| 316 | int i, j, acc; |
| 317 | int *audio = ctx->channel_data[ch]; |
| 318 | int bias = 1 << (ctx->filter_bits - 1); |
| 319 | int max_clip = (1 << bits) - 1, min_clip = -max_clip - 1; |
| 320 | |
| 321 | for (i = 1; i < length; i++) { |
| 322 | int flen = FFMIN(ctx->filter_length, i); |
| 323 | |
| 324 | acc = 0; |
| 325 | for (j = 0; j < flen; j++) |
| 326 | acc += ctx->filter[j] * audio[i - j - 1]; |
| 327 | if (acc < 0) { |
| 328 | acc = (acc + bias - 1) >> ctx->filter_bits; |
| 329 | acc = FFMAX(acc, min_clip); |
| 330 | } else { |
| 331 | acc = (acc + bias) >> ctx->filter_bits; |
| 332 | acc = FFMIN(acc, max_clip); |
| 333 | } |
| 334 | audio[i] += acc; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | static int decode_block(AVCodecContext *avctx, GetBitContext *gb, |
| 339 | int16_t *dst0, int16_t *dst1) |
| 340 | { |
| 341 | RALFContext *ctx = avctx->priv_data; |
| 342 | int len, ch, ret; |
| 343 | int dmode, mode[2], bits[2]; |
| 344 | int *ch0, *ch1; |
| 345 | int i, t, t2; |
| 346 | |
| 347 | len = 12 - get_unary(gb, 0, 6); |
| 348 | |
| 349 | if (len <= 7) len ^= 1; // codes for length = 6 and 7 are swapped |
| 350 | len = 1 << len; |
| 351 | |
| 352 | if (ctx->sample_offset + len > ctx->max_frame_size) { |
| 353 | av_log(avctx, AV_LOG_ERROR, |
| 354 | "Decoder's stomach is crying, it ate too many samples\n"); |
| 355 | return AVERROR_INVALIDDATA; |
| 356 | } |
| 357 | |
| 358 | if (avctx->channels > 1) |
| 359 | dmode = get_bits(gb, 2) + 1; |
| 360 | else |
| 361 | dmode = 0; |
| 362 | |
| 363 | mode[0] = (dmode == 4) ? 1 : 0; |
| 364 | mode[1] = (dmode >= 2) ? 2 : 0; |
| 365 | bits[0] = 16; |
| 366 | bits[1] = (mode[1] == 2) ? 17 : 16; |
| 367 | |
| 368 | for (ch = 0; ch < avctx->channels; ch++) { |
| 369 | if ((ret = decode_channel(ctx, gb, ch, len, mode[ch], bits[ch])) < 0) |
| 370 | return ret; |
| 371 | if (ctx->filter_params > 1 && ctx->filter_params != FILTER_RAW) { |
| 372 | ctx->filter_bits += 3; |
| 373 | apply_lpc(ctx, ch, len, bits[ch]); |
| 374 | } |
| 375 | if (get_bits_left(gb) < 0) |
| 376 | return AVERROR_INVALIDDATA; |
| 377 | } |
| 378 | ch0 = ctx->channel_data[0]; |
| 379 | ch1 = ctx->channel_data[1]; |
| 380 | switch (dmode) { |
| 381 | case 0: |
| 382 | for (i = 0; i < len; i++) |
| 383 | dst0[i] = ch0[i] + ctx->bias[0]; |
| 384 | break; |
| 385 | case 1: |
| 386 | for (i = 0; i < len; i++) { |
| 387 | dst0[i] = ch0[i] + ctx->bias[0]; |
| 388 | dst1[i] = ch1[i] + ctx->bias[1]; |
| 389 | } |
| 390 | break; |
| 391 | case 2: |
| 392 | for (i = 0; i < len; i++) { |
| 393 | ch0[i] += ctx->bias[0]; |
| 394 | dst0[i] = ch0[i]; |
| 395 | dst1[i] = ch0[i] - (ch1[i] + ctx->bias[1]); |
| 396 | } |
| 397 | break; |
| 398 | case 3: |
| 399 | for (i = 0; i < len; i++) { |
| 400 | t = ch0[i] + ctx->bias[0]; |
| 401 | t2 = ch1[i] + ctx->bias[1]; |
| 402 | dst0[i] = t + t2; |
| 403 | dst1[i] = t; |
| 404 | } |
| 405 | break; |
| 406 | case 4: |
| 407 | for (i = 0; i < len; i++) { |
| 408 | t = ch1[i] + ctx->bias[1]; |
| 409 | t2 = ((ch0[i] + ctx->bias[0]) << 1) | (t & 1); |
| 410 | dst0[i] = (t2 + t) / 2; |
| 411 | dst1[i] = (t2 - t) / 2; |
| 412 | } |
| 413 | break; |
| 414 | } |
| 415 | |
| 416 | ctx->sample_offset += len; |
| 417 | |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, |
| 422 | AVPacket *avpkt) |
| 423 | { |
| 424 | RALFContext *ctx = avctx->priv_data; |
| 425 | AVFrame *frame = data; |
| 426 | int16_t *samples0; |
| 427 | int16_t *samples1; |
| 428 | int ret; |
| 429 | GetBitContext gb; |
| 430 | int table_size, table_bytes, i; |
| 431 | const uint8_t *src, *block_pointer; |
| 432 | int src_size; |
| 433 | int bytes_left; |
| 434 | |
| 435 | if (ctx->has_pkt) { |
| 436 | ctx->has_pkt = 0; |
| 437 | table_bytes = (AV_RB16(avpkt->data) + 7) >> 3; |
| 438 | if (table_bytes + 3 > avpkt->size || avpkt->size > RALF_MAX_PKT_SIZE) { |
| 439 | av_log(avctx, AV_LOG_ERROR, "Wrong packet's breath smells of wrong data!\n"); |
| 440 | return AVERROR_INVALIDDATA; |
| 441 | } |
| 442 | if (memcmp(ctx->pkt, avpkt->data, 2 + table_bytes)) { |
| 443 | av_log(avctx, AV_LOG_ERROR, "Wrong packet tails are wrong!\n"); |
| 444 | return AVERROR_INVALIDDATA; |
| 445 | } |
| 446 | |
| 447 | src = ctx->pkt; |
| 448 | src_size = RALF_MAX_PKT_SIZE + avpkt->size; |
| 449 | memcpy(ctx->pkt + RALF_MAX_PKT_SIZE, avpkt->data + 2 + table_bytes, |
| 450 | avpkt->size - 2 - table_bytes); |
| 451 | } else { |
| 452 | if (avpkt->size == RALF_MAX_PKT_SIZE) { |
| 453 | memcpy(ctx->pkt, avpkt->data, avpkt->size); |
| 454 | ctx->has_pkt = 1; |
| 455 | *got_frame_ptr = 0; |
| 456 | |
| 457 | return avpkt->size; |
| 458 | } |
| 459 | src = avpkt->data; |
| 460 | src_size = avpkt->size; |
| 461 | } |
| 462 | |
| 463 | frame->nb_samples = ctx->max_frame_size; |
| 464 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 465 | return ret; |
| 466 | samples0 = (int16_t *)frame->data[0]; |
| 467 | samples1 = (int16_t *)frame->data[1]; |
| 468 | |
| 469 | if (src_size < 5) { |
| 470 | av_log(avctx, AV_LOG_ERROR, "too short packets are too short!\n"); |
| 471 | return AVERROR_INVALIDDATA; |
| 472 | } |
| 473 | table_size = AV_RB16(src); |
| 474 | table_bytes = (table_size + 7) >> 3; |
| 475 | if (src_size < table_bytes + 3) { |
| 476 | av_log(avctx, AV_LOG_ERROR, "short packets are short!\n"); |
| 477 | return AVERROR_INVALIDDATA; |
| 478 | } |
| 479 | init_get_bits(&gb, src + 2, table_size); |
| 480 | ctx->num_blocks = 0; |
| 481 | while (get_bits_left(&gb) > 0) { |
| 482 | ctx->block_size[ctx->num_blocks] = get_bits(&gb, 15); |
| 483 | if (get_bits1(&gb)) { |
| 484 | ctx->block_pts[ctx->num_blocks] = get_bits(&gb, 9); |
| 485 | } else { |
| 486 | ctx->block_pts[ctx->num_blocks] = 0; |
| 487 | } |
| 488 | ctx->num_blocks++; |
| 489 | } |
| 490 | |
| 491 | block_pointer = src + table_bytes + 2; |
| 492 | bytes_left = src_size - table_bytes - 2; |
| 493 | ctx->sample_offset = 0; |
| 494 | for (i = 0; i < ctx->num_blocks; i++) { |
| 495 | if (bytes_left < ctx->block_size[i]) { |
| 496 | av_log(avctx, AV_LOG_ERROR, "I'm pedaling backwards\n"); |
| 497 | break; |
| 498 | } |
| 499 | init_get_bits(&gb, block_pointer, ctx->block_size[i] * 8); |
| 500 | if (decode_block(avctx, &gb, samples0 + ctx->sample_offset, |
| 501 | samples1 + ctx->sample_offset) < 0) { |
| 502 | av_log(avctx, AV_LOG_ERROR, "Sir, I got carsick in your office. Not decoding the rest of packet.\n"); |
| 503 | break; |
| 504 | } |
| 505 | block_pointer += ctx->block_size[i]; |
| 506 | bytes_left -= ctx->block_size[i]; |
| 507 | } |
| 508 | |
| 509 | frame->nb_samples = ctx->sample_offset; |
| 510 | *got_frame_ptr = ctx->sample_offset > 0; |
| 511 | |
| 512 | return avpkt->size; |
| 513 | } |
| 514 | |
| 515 | static void decode_flush(AVCodecContext *avctx) |
| 516 | { |
| 517 | RALFContext *ctx = avctx->priv_data; |
| 518 | |
| 519 | ctx->has_pkt = 0; |
| 520 | } |
| 521 | |
| 522 | |
| 523 | AVCodec ff_ralf_decoder = { |
| 524 | .name = "ralf", |
| 525 | .long_name = NULL_IF_CONFIG_SMALL("RealAudio Lossless"), |
| 526 | .type = AVMEDIA_TYPE_AUDIO, |
| 527 | .id = AV_CODEC_ID_RALF, |
| 528 | .priv_data_size = sizeof(RALFContext), |
| 529 | .init = decode_init, |
| 530 | .close = decode_close, |
| 531 | .decode = decode_frame, |
| 532 | .flush = decode_flush, |
| 533 | .capabilities = CODEC_CAP_DR1, |
| 534 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
| 535 | AV_SAMPLE_FMT_NONE }, |
| 536 | }; |