aic.c 15.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
/*
 * Apple Intermediate Codec decoder
 *
 * Copyright (c) 2013 Konstantin Shishkov
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

23 24
#include <inttypes.h>

25 26 27 28 29
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "get_bits.h"
#include "golomb.h"
30
#include "idctdsp.h"
31
#include "thread.h"
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142
#include "unary.h"

#define AIC_HDR_SIZE    24
#define AIC_BAND_COEFFS (64 + 32 + 192 + 96)

enum AICBands {
    COEFF_LUMA = 0,
    COEFF_CHROMA,
    COEFF_LUMA_EXT,
    COEFF_CHROMA_EXT,
    NUM_BANDS
};

static const int aic_num_band_coeffs[NUM_BANDS] = { 64, 32, 192, 96 };

static const int aic_band_off[NUM_BANDS] = { 0, 64, 96, 288 };

static const uint8_t aic_quant_matrix[64] = {
     8, 16, 19, 22, 22, 26, 26, 27,
    16, 16, 22, 22, 26, 27, 27, 29,
    19, 22, 26, 26, 27, 29, 29, 35,
    22, 24, 27, 27, 29, 32, 34, 38,
    26, 27, 29, 29, 32, 35, 38, 46,
    27, 29, 34, 34, 35, 40, 46, 56,
    29, 34, 34, 37, 40, 48, 56, 69,
    34, 37, 38, 40, 48, 58, 69, 83,
};

static const uint8_t aic_y_scan[64] = {
     0,  4,  1,  2,  5,  8, 12,  9,
     6,  3,  7, 10, 13, 14, 11, 15,
    47, 43, 46, 45, 42, 39, 35, 38,
    41, 44, 40, 37, 34, 33, 36, 32,
    16, 20, 17, 18, 21, 24, 28, 25,
    22, 19, 23, 26, 29, 30, 27, 31,
    63, 59, 62, 61, 58, 55, 51, 54,
    57, 60, 56, 53, 50, 49, 52, 48,
};

static const uint8_t aic_y_ext_scan[192] = {
     64,  72,  65,  66,  73,  80,  88,  81,
     74,  67,  75,  82,  89,  90,  83,  91,
      0,   4,   1,   2,   5,   8,  12,   9,
      6,   3,   7,  10,  13,  14,  11,  15,
     16,  20,  17,  18,  21,  24,  28,  25,
     22,  19,  23,  26,  29,  30,  27,  31,
    155, 147, 154, 153, 146, 139, 131, 138,
    145, 152, 144, 137, 130, 129, 136, 128,
     47,  43,  46,  45,  42,  39,  35,  38,
     41,  44,  40,  37,  34,  33,  36,  32,
     63,  59,  62,  61,  58,  55,  51,  54,
     57,  60,  56,  53,  50,  49,  52,  48,
     96, 104,  97,  98, 105, 112, 120, 113,
    106,  99, 107, 114, 121, 122, 115, 123,
     68,  76,  69,  70,  77,  84,  92,  85,
     78,  71,  79,  86,  93,  94,  87,  95,
    100, 108, 101, 102, 109, 116, 124, 117,
    110, 103, 111, 118, 125, 126, 119, 127,
    187, 179, 186, 185, 178, 171, 163, 170,
    177, 184, 176, 169, 162, 161, 168, 160,
    159, 151, 158, 157, 150, 143, 135, 142,
    149, 156, 148, 141, 134, 133, 140, 132,
    191, 183, 190, 189, 182, 175, 167, 174,
    181, 188, 180, 173, 166, 165, 172, 164,
};

static const uint8_t aic_c_scan[64] = {
     0,  4,  1,  2,  5,  8, 12,  9,
     6,  3,  7, 10, 13, 14, 11, 15,
    31, 27, 30, 29, 26, 23, 19, 22,
    25, 28, 24, 21, 18, 17, 20, 16,
    32, 36, 33, 34, 37, 40, 44, 41,
    38, 35, 39, 42, 45, 46, 43, 47,
    63, 59, 62, 61, 58, 55, 51, 54,
    57, 60, 56, 53, 50, 49, 52, 48,
};

static const uint8_t aic_c_ext_scan[192] = {
     16,  24,  17,  18,  25,  32,  40,  33,
     26,  19,  27,  34,  41,  42,  35,  43,
      0,   4,   1,   2,   5,   8,  12,   9,
      6,   3,   7,  10,  13,  14,  11,  15,
     20,  28,  21,  22,  29,  36,  44,  37,
     30,  23,  31,  38,  45,  46,  39,  47,
     95,  87,  94,  93,  86,  79,  71,  78,
     85,  92,  84,  77,  70,  69,  76,  68,
     63,  59,  62,  61,  58,  55,  51,  54,
     57,  60,  56,  53,  50,  49,  52,  48,
     91,  83,  90,  89,  82,  75,  67,  74,
     81,  88,  80,  73,  66,  65,  72,  64,
    112, 120, 113, 114, 121, 128, 136, 129,
    122, 115, 123, 130, 137, 138, 131, 139,
     96, 100,  97,  98, 101, 104, 108, 105,
    102,  99, 103, 106, 109, 110, 107, 111,
    116, 124, 117, 118, 125, 132, 140, 133,
    126, 119, 127, 134, 141, 142, 135, 143,
    191, 183, 190, 189, 182, 175, 167, 174,
    181, 188, 180, 173, 166, 165, 172, 164,
    159, 155, 158, 157, 154, 151, 147, 150,
    153, 156, 152, 149, 146, 145, 148, 144,
    187, 179, 186, 185, 178, 171, 163, 170,
    177, 184, 176, 169, 162, 161, 168, 160,
};

static const uint8_t *aic_scan[NUM_BANDS] = {
    aic_y_scan, aic_c_scan, aic_y_ext_scan, aic_c_ext_scan
};

typedef struct AICContext {
    AVCodecContext *avctx;
    AVFrame        *frame;
143
    IDCTDSPContext idsp;
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174
    ScanTable      scantable;

    int            num_x_slices;
    int            slice_width;
    int            mb_width, mb_height;
    int            quant;
    int            interlaced;

    int16_t        *slice_data;
    int16_t        *data_ptr[NUM_BANDS];

    DECLARE_ALIGNED(16, int16_t, block)[64];
} AICContext;

static int aic_decode_header(AICContext *ctx, const uint8_t *src, int size)
{
    uint32_t frame_size;
    int width, height;

    if (src[0] != 1) {
        av_log(ctx->avctx, AV_LOG_ERROR, "Invalid version %d\n", src[0]);
        return AVERROR_INVALIDDATA;
    }
    if (src[1] != AIC_HDR_SIZE - 2) {
        av_log(ctx->avctx, AV_LOG_ERROR, "Invalid header size %d\n", src[1]);
        return AVERROR_INVALIDDATA;
    }
    frame_size = AV_RB32(src + 2);
    width      = AV_RB16(src + 6);
    height     = AV_RB16(src + 8);
    if (frame_size > size) {
175
        av_log(ctx->avctx, AV_LOG_ERROR, "Frame size should be %"PRIu32" got %d\n",
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201
               frame_size, size);
        return AVERROR_INVALIDDATA;
    }
    if (width != ctx->avctx->width || height != ctx->avctx->height) {
        av_log(ctx->avctx, AV_LOG_ERROR,
               "Picture dimension changed: old: %d x %d, new: %d x %d\n",
               ctx->avctx->width, ctx->avctx->height, width, height);
        return AVERROR_INVALIDDATA;
    }
    ctx->quant      = src[15];
    ctx->interlaced = ((src[16] >> 4) == 3);

    return 0;
}

#define GET_CODE(val, type, add_bits)                         \
    do {                                                      \
        if (type)                                             \
            val = get_ue_golomb(gb);                          \
        else                                                  \
            val = get_unary(gb, 1, 31);                       \
        if (add_bits)                                         \
            val = (val << add_bits) + get_bits(gb, add_bits); \
    } while (0)

static int aic_decode_coeffs(GetBitContext *gb, int16_t *dst,
202
                             int band, int slice_width, int force_chroma)
203 204 205
{
    int has_skips, coeff_type, coeff_bits, skip_type, skip_bits;
    const int num_coeffs = aic_num_band_coeffs[band];
206
    const uint8_t *scan = aic_scan[band | force_chroma];
207 208 209 210 211 212 213 214 215 216 217 218 219 220
    int mb, idx, val;

    has_skips  = get_bits1(gb);
    coeff_type = get_bits1(gb);
    coeff_bits = get_bits(gb, 3);

    if (has_skips) {
        skip_type = get_bits1(gb);
        skip_bits = get_bits(gb, 3);

        for (mb = 0; mb < slice_width; mb++) {
            idx = -1;
            do {
                GET_CODE(val, skip_type, skip_bits);
221 222
                if (val < 0)
                    return AVERROR_INVALIDDATA;
223 224 225 226 227
                idx += val + 1;
                if (idx >= num_coeffs)
                    break;
                GET_CODE(val, coeff_type, coeff_bits);
                val++;
228
                if (val >= 0x10000 || val < 0)
229 230 231 232 233 234 235 236 237
                    return AVERROR_INVALIDDATA;
                dst[scan[idx]] = val;
            } while (idx < num_coeffs - 1);
            dst += num_coeffs;
        }
    } else {
        for (mb = 0; mb < slice_width; mb++) {
            for (idx = 0; idx < num_coeffs; idx++) {
                GET_CODE(val, coeff_type, coeff_bits);
238
                if (val >= 0x10000 || val < 0)
239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326
                    return AVERROR_INVALIDDATA;
                dst[scan[idx]] = val;
            }
            dst += num_coeffs;
        }
    }
    return 0;
}

static void recombine_block(int16_t *dst, const uint8_t *scan,
                            int16_t **base, int16_t **ext)
{
    int i, j;

    for (i = 0; i < 4; i++) {
        for (j = 0; j < 4; j++)
            dst[scan[i * 8 + j]]     = (*base)[j];
        for (j = 0; j < 4; j++)
            dst[scan[i * 8 + j + 4]] = (*ext)[j];
        *base += 4;
        *ext  += 4;
    }
    for (; i < 8; i++) {
        for (j = 0; j < 8; j++)
            dst[scan[i * 8 + j]] = (*ext)[j];
        *ext  += 8;
    }
}

static void recombine_block_il(int16_t *dst, const uint8_t *scan,
                               int16_t **base, int16_t **ext,
                               int block_no)
{
    int i, j;

    if (block_no < 2) {
        for (i = 0; i < 8; i++) {
            for (j = 0; j < 4; j++)
                dst[scan[i * 8 + j]]     = (*base)[j];
            for (j = 0; j < 4; j++)
                dst[scan[i * 8 + j + 4]] = (*ext)[j];
            *base += 4;
            *ext  += 4;
        }
    } else {
        for (i = 0; i < 64; i++)
            dst[scan[i]] = (*ext)[i];
        *ext += 64;
    }
}

static void unquant_block(int16_t *block, int q)
{
    int i;

    for (i = 0; i < 64; i++) {
        int val  = (uint16_t)block[i];
        int sign = val & 1;

        block[i] = (((val >> 1) ^ -sign) * q * aic_quant_matrix[i] >> 4)
                   + sign;
    }
}

static int aic_decode_slice(AICContext *ctx, int mb_x, int mb_y,
                            const uint8_t *src, int src_size)
{
    GetBitContext gb;
    int ret, i, mb, blk;
    int slice_width = FFMIN(ctx->slice_width, ctx->mb_width - mb_x);
    uint8_t *Y, *C[2];
    uint8_t *dst;
    int16_t *base_y = ctx->data_ptr[COEFF_LUMA];
    int16_t *base_c = ctx->data_ptr[COEFF_CHROMA];
    int16_t *ext_y  = ctx->data_ptr[COEFF_LUMA_EXT];
    int16_t *ext_c  = ctx->data_ptr[COEFF_CHROMA_EXT];
    const int ystride = ctx->frame->linesize[0];

    Y = ctx->frame->data[0] + mb_x * 16 + mb_y * 16 * ystride;
    for (i = 0; i < 2; i++)
        C[i] = ctx->frame->data[i + 1] + mb_x * 8
               + mb_y * 8 * ctx->frame->linesize[i + 1];
    init_get_bits(&gb, src, src_size * 8);

    memset(ctx->slice_data, 0,
           sizeof(*ctx->slice_data) * slice_width * AIC_BAND_COEFFS);
    for (i = 0; i < NUM_BANDS; i++)
        if ((ret = aic_decode_coeffs(&gb, ctx->data_ptr[i],
327 328
                                     i, slice_width,
                                     !ctx->interlaced)) < 0)
329 330 331 332 333 334 335 336 337 338 339
            return ret;

    for (mb = 0; mb < slice_width; mb++) {
        for (blk = 0; blk < 4; blk++) {
            if (!ctx->interlaced)
                recombine_block(ctx->block, ctx->scantable.permutated,
                                &base_y, &ext_y);
            else
                recombine_block_il(ctx->block, ctx->scantable.permutated,
                                   &base_y, &ext_y, blk);
            unquant_block(ctx->block, ctx->quant);
340
            ctx->idsp.idct(ctx->block);
341 342

            if (!ctx->interlaced) {
343
                dst = Y + (blk >> 1) * 8 * ystride + (blk & 1) * 8;
344
                ctx->idsp.put_signed_pixels_clamped(ctx->block, dst, ystride);
345 346
            } else {
                dst = Y + (blk & 1) * 8 + (blk >> 1) * ystride;
347 348
                ctx->idsp.put_signed_pixels_clamped(ctx->block, dst,
                                                    ystride * 2);
349 350 351 352 353 354 355 356
            }
        }
        Y += 16;

        for (blk = 0; blk < 2; blk++) {
            recombine_block(ctx->block, ctx->scantable.permutated,
                            &base_c, &ext_c);
            unquant_block(ctx->block, ctx->quant);
357 358 359
            ctx->idsp.idct(ctx->block);
            ctx->idsp.put_signed_pixels_clamped(ctx->block, C[blk],
                                                ctx->frame->linesize[blk + 1]);
360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376
            C[blk] += 8;
        }
    }

    return 0;
}

static int aic_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                            AVPacket *avpkt)
{
    AICContext *ctx    = avctx->priv_data;
    const uint8_t *buf = avpkt->data;
    int buf_size       = avpkt->size;
    GetByteContext gb;
    uint32_t off;
    int x, y, ret;
    int slice_size;
377
    ThreadFrame frame = { .f = data };
378 379 380 381 382 383 384 385 386 387 388 389

    ctx->frame            = data;
    ctx->frame->pict_type = AV_PICTURE_TYPE_I;
    ctx->frame->key_frame = 1;

    off = FFALIGN(AIC_HDR_SIZE + ctx->num_x_slices * ctx->mb_height * 2, 4);

    if (buf_size < off) {
        av_log(avctx, AV_LOG_ERROR, "Too small frame\n");
        return AVERROR_INVALIDDATA;
    }

390 391 392
    ret = aic_decode_header(ctx, buf, buf_size);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR, "Invalid header\n");
393
        return ret;
394
    }
395

396
    if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
397 398 399 400 401 402 403 404 405
        return ret;

    bytestream2_init(&gb, buf + AIC_HDR_SIZE,
                     ctx->num_x_slices * ctx->mb_height * 2);

    for (y = 0; y < ctx->mb_height; y++) {
        for (x = 0; x < ctx->mb_width; x += ctx->slice_width) {
            slice_size = bytestream2_get_le16(&gb) * 4;
            if (slice_size + off > buf_size || !slice_size) {
406 407
                av_log(avctx, AV_LOG_ERROR,
                       "Incorrect slice size %d at %d.%d\n", slice_size, x, y);
408 409 410
                return AVERROR_INVALIDDATA;
            }

411 412 413 414
            ret = aic_decode_slice(ctx, x, y, buf + off, slice_size);
            if (ret < 0) {
                av_log(avctx, AV_LOG_ERROR,
                       "Error decoding slice at %d.%d\n", x, y);
415
                return ret;
416
            }
417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436

            off += slice_size;
        }
    }

    *got_frame = 1;

    return avpkt->size;
}

static av_cold int aic_decode_init(AVCodecContext *avctx)
{
    AICContext *ctx = avctx->priv_data;
    int i;
    uint8_t scan[64];

    ctx->avctx = avctx;

    avctx->pix_fmt = AV_PIX_FMT_YUV420P;

437
    ff_idctdsp_init(&ctx->idsp, avctx);
438 439 440

    for (i = 0; i < 64; i++)
        scan[i] = i;
441
    ff_init_scantable(ctx->idsp.idct_permutation, &ctx->scantable, scan);
442 443 444 445

    ctx->mb_width  = FFALIGN(avctx->width,  16) >> 4;
    ctx->mb_height = FFALIGN(avctx->height, 16) >> 4;

446 447
    ctx->num_x_slices = (ctx->mb_width + 15) >> 4;
    ctx->slice_width  = 16;
448
    for (i = 1; i < 32; i++) {
449
        if (!(ctx->mb_width % i) && (ctx->mb_width / i <= 32)) {
450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481
            ctx->slice_width  = ctx->mb_width / i;
            ctx->num_x_slices = i;
            break;
        }
    }

    ctx->slice_data = av_malloc(ctx->slice_width * AIC_BAND_COEFFS
                                * sizeof(*ctx->slice_data));
    if (!ctx->slice_data) {
        av_log(avctx, AV_LOG_ERROR, "Error allocating slice buffer\n");

        return AVERROR(ENOMEM);
    }

    for (i = 0; i < NUM_BANDS; i++)
        ctx->data_ptr[i] = ctx->slice_data + ctx->slice_width
                                             * aic_band_off[i];

    return 0;
}

static av_cold int aic_decode_close(AVCodecContext *avctx)
{
    AICContext *ctx = avctx->priv_data;

    av_freep(&ctx->slice_data);

    return 0;
}

AVCodec ff_aic_decoder = {
    .name           = "aic",
482
    .long_name      = NULL_IF_CONFIG_SMALL("Apple Intermediate Codec"),
483 484 485 486 487 488
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_AIC,
    .priv_data_size = sizeof(AICContext),
    .init           = aic_decode_init,
    .close          = aic_decode_close,
    .decode         = aic_decode_frame,
489 490
    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(aic_decode_init),
491
};