mimic.c 15.2 KB
Newer Older
Ramiro Polla's avatar
Ramiro Polla committed
1 2
/*
 * Copyright (C) 2005  Ole Andr Vadla Ravns <oleavr@gmail.com>
3
 * Copyright (C) 2008  Ramiro Polla
Ramiro Polla's avatar
Ramiro Polla committed
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdlib.h>
#include <string.h>
#include <stdint.h>

#include "avcodec.h"
27
#include "internal.h"
28
#include "get_bits.h"
29
#include "bytestream.h"
Ramiro Polla's avatar
Ramiro Polla committed
30
#include "dsputil.h"
31
#include "thread.h"
Ramiro Polla's avatar
Ramiro Polla committed
32 33 34 35 36 37 38 39 40

#define MIMIC_HEADER_SIZE   20

typedef struct {
    AVCodecContext *avctx;

    int             num_vblocks[3];
    int             num_hblocks[3];

41
    void           *swap_buf;
Ramiro Polla's avatar
Ramiro Polla committed
42 43 44 45 46 47 48 49
    int             swap_buf_size;

    int             cur_index;
    int             prev_index;

    AVFrame         buf_ptrs    [16];
    AVPicture       flipped_ptrs[16];

50
    DECLARE_ALIGNED(16, DCTELEM, dct_block)[64];
Ramiro Polla's avatar
Ramiro Polla committed
51 52 53 54

    GetBitContext   gb;
    ScanTable       scantable;
    DSPContext      dsp;
Ramiro Polla's avatar
Ramiro Polla committed
55
    VLC             vlc;
56 57 58 59

    /* Kept in the context so multithreading can have a constant to read from */
    int             next_cur_index;
    int             next_prev_index;
Ramiro Polla's avatar
Ramiro Polla committed
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
} MimicContext;

static const uint32_t huffcodes[] = {
    0x0000000a, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
    0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
    0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x0000000b,
    0x0000001b, 0x00000038, 0x00000078, 0x00000079, 0x0000007a, 0x000000f9,
    0x000000fa, 0x000003fb, 0x000007f8, 0x000007f9, 0x000007fa, 0x000007fb,
    0x00000ff8, 0x00000ff9, 0x00000001, 0x00000039, 0x0000007b, 0x000000fb,
    0x000001f8, 0x000001f9, 0x00000ffa, 0x00000ffb, 0x00001ff8, 0x00001ff9,
    0x00001ffa, 0x00001ffb, 0x00003ff8, 0x00003ff9, 0x00003ffa, 0x00000000,
    0x00000004, 0x0000003a, 0x000001fa, 0x00003ffb, 0x00007ff8, 0x00007ff9,
    0x00007ffa, 0x00007ffb, 0x0000fff8, 0x0000fff9, 0x0000fffa, 0x0000fffb,
    0x0001fff8, 0x0001fff9, 0x0001fffa, 0x00000000, 0x0000000c, 0x000000f8,
    0x000001fb, 0x0001fffb, 0x0003fff8, 0x0003fff9, 0x0003fffa, 0x0003fffb,
    0x0007fff8, 0x0007fff9, 0x0007fffa, 0x0007fffb, 0x000ffff8, 0x000ffff9,
    0x000ffffa, 0x00000000, 0x0000001a, 0x000003f8, 0x000ffffb, 0x001ffff8,
    0x001ffff9, 0x001ffffa, 0x001ffffb, 0x003ffff8, 0x003ffff9, 0x003ffffa,
    0x003ffffb, 0x007ffff8, 0x007ffff9, 0x007ffffa, 0x007ffffb, 0x00000000,
    0x0000003b, 0x000003f9, 0x00fffff8, 0x00fffff9, 0x00fffffa, 0x00fffffb,
    0x01fffff8, 0x01fffff9, 0x01fffffa, 0x01fffffb, 0x03fffff8, 0x03fffff9,
    0x03fffffa, 0x03fffffb, 0x07fffff8, 0x00000000, 0x000003fa, 0x07fffff9,
    0x07fffffa, 0x07fffffb, 0x0ffffff8, 0x0ffffff9, 0x0ffffffa, 0x0ffffffb,
    0x1ffffff8, 0x1ffffff9, 0x1ffffffa, 0x1ffffffb, 0x3ffffff8, 0x3ffffff9,
    0x3ffffffa,
};

static const uint8_t huffbits[] = {
     4,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
     0,  0,  0,  0,  2,  4,  5,  6,  7,  7,  7,  8,
     8, 10, 11, 11, 11, 11, 12, 12,  2,  6,  7,  8,
     9,  9, 12, 12, 13, 13, 13, 13, 14, 14, 14,  0,
     3,  6,  9, 14, 15, 15, 15, 15, 16, 16, 16, 16,
    17, 17, 17,  0,  4,  8,  9, 17, 18, 18, 18, 18,
    19, 19, 19, 19, 20, 20, 20,  0,  5, 10, 20, 21,
    21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23,  0,
     6, 10, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26,
    26, 26, 27,  0, 10, 27, 27, 27, 28, 28, 28, 28,
    29, 29, 29, 29, 30, 30, 30,
};

static const uint8_t col_zag[64] = {
     0,  8,  1,  2,  9, 16, 24, 17,
    10,  3,  4, 11, 18, 25, 32, 40,
    33, 26, 19, 12,  5,  6, 13, 20,
    27, 34, 41, 48, 56, 49, 42, 35,
    28, 21, 14,  7, 15, 22, 29, 36,
    43, 50, 57, 58, 51, 44, 37, 30,
    23, 31, 38, 45, 52, 59, 39, 46,
Ramiro Polla's avatar
Ramiro Polla committed
109
    53, 60, 61, 54, 47, 55, 62, 63,
Ramiro Polla's avatar
Ramiro Polla committed
110 111
};

112
static av_cold int mimic_decode_init(AVCodecContext *avctx)
Ramiro Polla's avatar
Ramiro Polla committed
113 114 115 116 117 118
{
    MimicContext *ctx = avctx->priv_data;

    ctx->prev_index = 0;
    ctx->cur_index = 15;

119
    if(init_vlc(&ctx->vlc, 11, FF_ARRAY_ELEMS(huffbits),
Ramiro Polla's avatar
Ramiro Polla committed
120 121 122 123 124 125 126 127 128 129
                 huffbits, 1, 1, huffcodes, 4, 4, 0)) {
        av_log(avctx, AV_LOG_ERROR, "error initializing vlc table\n");
        return -1;
    }
    dsputil_init(&ctx->dsp, avctx);
    ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, col_zag);

    return 0;
}

130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146
static int mimic_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
{
    MimicContext *dst = avctx->priv_data, *src = avctx_from->priv_data;

    if (avctx == avctx_from) return 0;

    dst->cur_index  = src->next_cur_index;
    dst->prev_index = src->next_prev_index;

    memcpy(dst->buf_ptrs, src->buf_ptrs, sizeof(src->buf_ptrs));
    memcpy(dst->flipped_ptrs, src->flipped_ptrs, sizeof(src->flipped_ptrs));

    memset(&dst->buf_ptrs[dst->cur_index], 0, sizeof(AVFrame));

    return 0;
}

147
static const int8_t vlcdec_lookup[9][64] = {
Ramiro Polla's avatar
Ramiro Polla committed
148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183
    {    0, },
    {   -1,   1, },
    {   -3,   3,   -2,   2, },
    {   -7,   7,   -6,   6,   -5,   5,   -4,   4, },
    {  -15,  15,  -14,  14,  -13,  13,  -12,  12,
       -11,  11,  -10,  10,   -9,   9,   -8,   8, },
    {  -31,  31,  -30,  30,  -29,  29,  -28,  28,
       -27,  27,  -26,  26,  -25,  25,  -24,  24,
       -23,  23,  -22,  22,  -21,  21,  -20,  20,
       -19,  19,  -18,  18,  -17,  17,  -16,  16, },
    {  -63,  63,  -62,  62,  -61,  61,  -60,  60,
       -59,  59,  -58,  58,  -57,  57,  -56,  56,
       -55,  55,  -54,  54,  -53,  53,  -52,  52,
       -51,  51,  -50,  50,  -49,  49,  -48,  48,
       -47,  47,  -46,  46,  -45,  45,  -44,  44,
       -43,  43,  -42,  42,  -41,  41,  -40,  40,
       -39,  39,  -38,  38,  -37,  37,  -36,  36,
       -35,  35,  -34,  34,  -33,  33,  -32,  32, },
    { -127, 127, -126, 126, -125, 125, -124, 124,
      -123, 123, -122, 122, -121, 121, -120, 120,
      -119, 119, -118, 118, -117, 117, -116, 116,
      -115, 115, -114, 114, -113, 113, -112, 112,
      -111, 111, -110, 110, -109, 109, -108, 108,
      -107, 107, -106, 106, -105, 105, -104, 104,
      -103, 103, -102, 102, -101, 101, -100, 100,
       -99,  99,  -98,  98,  -97,  97,  -96,  96, },
    {  -95,  95,  -94,  94,  -93,  93,  -92,  92,
       -91,  91,  -90,  90,  -89,  89,  -88,  88,
       -87,  87,  -86,  86,  -85,  85,  -84,  84,
       -83,  83,  -82,  82,  -81,  81,  -80,  80,
       -79,  79,  -78,  78,  -77,  77,  -76,  76,
       -75,  75,  -74,  74,  -73,  73,  -72,  72,
       -71,  71,  -70,  70,  -69,  69,  -68,  68,
       -67,  67,  -66,  66,  -65,  65,  -64,  64, },
};

184
static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
Ramiro Polla's avatar
Ramiro Polla committed
185
{
186
    DCTELEM *block = ctx->dct_block;
Ramiro Polla's avatar
Ramiro Polla committed
187 188
    unsigned int pos;

Loren Merritt's avatar
Loren Merritt committed
189
    ctx->dsp.clear_block(block);
Ramiro Polla's avatar
Ramiro Polla committed
190 191 192 193 194 195 196 197

    block[0] = get_bits(&ctx->gb, 8) << 3;

    for(pos = 1; pos < num_coeffs; pos++) {
        uint32_t vlc, num_bits;
        int value;
        int coeff;

198
        vlc = get_vlc2(&ctx->gb, ctx->vlc.table, ctx->vlc.bits, 3);
Ramiro Polla's avatar
Ramiro Polla committed
199 200 201 202 203 204 205 206 207 208 209 210 211 212
        if(!vlc) /* end-of-block code */
            return 1;
        if(vlc == -1)
            return 0;

        /* pos_add and num_bits are coded in the vlc code */
        pos +=     vlc&15; // pos_add
        num_bits = vlc>>4; // num_bits

        if(pos >= 64)
            return 0;

        value = get_bits(&ctx->gb, num_bits);

213
        /* FFmpeg's IDCT behaves somewhat different from the original code, so
Ramiro Polla's avatar
Ramiro Polla committed
214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230
         * a factor of 4 was added to the input */

        coeff = vlcdec_lookup[num_bits][value];
        if(pos<3)
            coeff <<= 4;
        else /* TODO Use >> 10 instead of / 1001 */
            coeff = (coeff * qscale) / 1001;

        block[ctx->scantable.permutated[pos]] = coeff;
    }

    return 1;
}

static int decode(MimicContext *ctx, int quality, int num_coeffs,
                  int is_iframe)
{
231
    int y, x, plane, cur_row = 0;
Ramiro Polla's avatar
Ramiro Polla committed
232 233 234 235 236 237 238 239

    for(plane = 0; plane < 3; plane++) {
        const int is_chroma = !!plane;
        const int qscale = av_clip(10000-quality,is_chroma?1000:2000,10000)<<2;
        const int stride = ctx->flipped_ptrs[ctx->cur_index].linesize[plane];
        const uint8_t *src = ctx->flipped_ptrs[ctx->prev_index].data[plane];
        uint8_t       *dst = ctx->flipped_ptrs[ctx->cur_index ].data[plane];

Ramiro Polla's avatar
Ramiro Polla committed
240
        for(y = 0; y < ctx->num_vblocks[plane]; y++) {
Ramiro Polla's avatar
Ramiro Polla committed
241 242 243 244 245 246 247 248 249 250 251 252 253
            for(x = 0; x < ctx->num_hblocks[plane]; x++) {

                /* Check for a change condition in the current block.
                 * - iframes always change.
                 * - Luma plane changes on get_bits1 == 0
                 * - Chroma planes change on get_bits1 == 1 */
                if(is_iframe || get_bits1(&ctx->gb) == is_chroma) {

                    /* Luma planes may use a backreference from the 15 last
                     * frames preceding the previous. (get_bits1 == 1)
                     * Chroma planes don't use backreferences. */
                    if(is_chroma || is_iframe || !get_bits1(&ctx->gb)) {

254
                        if(!vlc_decode_block(ctx, num_coeffs, qscale))
Ramiro Polla's avatar
Ramiro Polla committed
255 256 257 258 259 260 261
                            return 0;
                        ctx->dsp.idct_put(dst, stride, ctx->dct_block);
                    } else {
                        unsigned int backref = get_bits(&ctx->gb, 4);
                        int index = (ctx->cur_index+backref)&15;
                        uint8_t *p = ctx->flipped_ptrs[index].data[0];

262
                        ff_thread_await_progress(&ctx->buf_ptrs[index], cur_row, 0);
Ramiro Polla's avatar
Ramiro Polla committed
263 264 265 266 267 268 269 270 271 272
                        if(p) {
                            p += src -
                                ctx->flipped_ptrs[ctx->prev_index].data[plane];
                            ctx->dsp.put_pixels_tab[1][0](dst, p, stride, 8);
                        } else {
                            av_log(ctx->avctx, AV_LOG_ERROR,
                                     "No such backreference! Buggy sample.\n");
                        }
                    }
                } else {
273
                    ff_thread_await_progress(&ctx->buf_ptrs[ctx->prev_index], cur_row, 0);
Ramiro Polla's avatar
Ramiro Polla committed
274 275 276 277 278 279 280
                    ctx->dsp.put_pixels_tab[1][0](dst, src, stride, 8);
                }
                src += 8;
                dst += 8;
            }
            src += (stride - ctx->num_hblocks[plane])<<3;
            dst += (stride - ctx->num_hblocks[plane])<<3;
281 282

            ff_thread_report_progress(&ctx->buf_ptrs[ctx->cur_index], cur_row++, 0);
Ramiro Polla's avatar
Ramiro Polla committed
283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298
        }
    }

    return 1;
}

/**
 * Flip the buffer upside-down and put it in the YVU order to match the
 * way Mimic encodes frames.
 */
static void prepare_avpic(MimicContext *ctx, AVPicture *dst, AVPicture *src)
{
    int i;
    dst->data[0] = src->data[0]+( ctx->avctx->height    -1)*src->linesize[0];
    dst->data[1] = src->data[2]+((ctx->avctx->height>>1)-1)*src->linesize[2];
    dst->data[2] = src->data[1]+((ctx->avctx->height>>1)-1)*src->linesize[1];
Ramiro Polla's avatar
Ramiro Polla committed
299
    for(i = 0; i < 3; i++)
Ramiro Polla's avatar
Ramiro Polla committed
300 301 302 303
        dst->linesize[i] = -src->linesize[i];
}

static int mimic_decode_frame(AVCodecContext *avctx, void *data,
304
                              int *data_size, AVPacket *avpkt)
Ramiro Polla's avatar
Ramiro Polla committed
305
{
306 307
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
Ramiro Polla's avatar
Ramiro Polla committed
308 309 310 311 312 313 314 315 316 317 318
    MimicContext *ctx = avctx->priv_data;
    int is_pframe;
    int width, height;
    int quality, num_coeffs;
    int swap_buf_size = buf_size - MIMIC_HEADER_SIZE;

    if(buf_size < MIMIC_HEADER_SIZE) {
        av_log(avctx, AV_LOG_ERROR, "insufficient data\n");
        return -1;
    }

319
    buf       += 2; /* some constant (always 256) */
320 321 322
    quality    = bytestream_get_le16(&buf);
    width      = bytestream_get_le16(&buf);
    height     = bytestream_get_le16(&buf);
323
    buf       += 4; /* some constant */
324
    is_pframe  = bytestream_get_le32(&buf);
325 326
    num_coeffs = bytestream_get_byte(&buf);
    buf       += 3; /* some constant */
Ramiro Polla's avatar
Ramiro Polla committed
327 328 329 330 331 332 333 334 335 336 337 338 339 340

    if(!ctx->avctx) {
        int i;

        if(!(width == 160 && height == 120) &&
           !(width == 320 && height == 240)) {
            av_log(avctx, AV_LOG_ERROR, "invalid width/height!\n");
            return -1;
        }

        ctx->avctx     = avctx;
        avctx->width   = width;
        avctx->height  = height;
        avctx->pix_fmt = PIX_FMT_YUV420P;
Ramiro Polla's avatar
Ramiro Polla committed
341
        for(i = 0; i < 3; i++) {
Ramiro Polla's avatar
Ramiro Polla committed
342 343 344 345 346 347 348 349 350 351 352 353 354
            ctx->num_vblocks[i] = -((-height) >> (3 + !!i));
            ctx->num_hblocks[i] =     width   >> (3 + !!i) ;
        }
    } else if(width != ctx->avctx->width || height != ctx->avctx->height) {
        av_log(avctx, AV_LOG_ERROR, "resolution changing is not supported\n");
        return -1;
    }

    if(is_pframe && !ctx->buf_ptrs[ctx->prev_index].data[0]) {
        av_log(avctx, AV_LOG_ERROR, "decoding must start with keyframe\n");
        return -1;
    }

355
    ctx->buf_ptrs[ctx->cur_index].reference = 3;
356
    ctx->buf_ptrs[ctx->cur_index].pict_type = is_pframe ? AV_PICTURE_TYPE_P:AV_PICTURE_TYPE_I;
357
    if(ff_thread_get_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index])) {
Ramiro Polla's avatar
Ramiro Polla committed
358 359 360 361
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
        return -1;
    }

362 363 364
    ctx->next_prev_index = ctx->cur_index;
    ctx->next_cur_index  = (ctx->cur_index - 1) & 15;

Ramiro Polla's avatar
Ramiro Polla committed
365 366 367
    prepare_avpic(ctx, &ctx->flipped_ptrs[ctx->cur_index],
                  (AVPicture*) &ctx->buf_ptrs[ctx->cur_index]);

368 369
    ff_thread_finish_setup(avctx);

370
    av_fast_padded_malloc(&ctx->swap_buf, &ctx->swap_buf_size, swap_buf_size);
Ramiro Polla's avatar
Ramiro Polla committed
371
    if(!ctx->swap_buf)
372
        return AVERROR(ENOMEM);
Ramiro Polla's avatar
Ramiro Polla committed
373

374
    ctx->dsp.bswap_buf(ctx->swap_buf,
375
                        (const uint32_t*) buf,
Ramiro Polla's avatar
Ramiro Polla committed
376 377 378 379
                        swap_buf_size>>2);
    init_get_bits(&ctx->gb, ctx->swap_buf, swap_buf_size << 3);

    if(!decode(ctx, quality, num_coeffs, !is_pframe)) {
380 381 382 383 384 385
        if (avctx->active_thread_type&FF_THREAD_FRAME)
            ff_thread_report_progress(&ctx->buf_ptrs[ctx->cur_index], INT_MAX, 0);
        else {
            ff_thread_release_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index]);
            return -1;
        }
Ramiro Polla's avatar
Ramiro Polla committed
386 387 388 389 390
    }

    *(AVFrame*)data = ctx->buf_ptrs[ctx->cur_index];
    *data_size = sizeof(AVFrame);

391 392
    ctx->prev_index = ctx->next_prev_index;
    ctx->cur_index  = ctx->next_cur_index;
Ramiro Polla's avatar
Ramiro Polla committed
393 394 395

    /* Only release frames that aren't used for backreferences anymore */
    if(ctx->buf_ptrs[ctx->cur_index].data[0])
396
        ff_thread_release_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index]);
Ramiro Polla's avatar
Ramiro Polla committed
397 398 399 400

    return buf_size;
}

401
static av_cold int mimic_decode_end(AVCodecContext *avctx)
Ramiro Polla's avatar
Ramiro Polla committed
402 403 404 405 406
{
    MimicContext *ctx = avctx->priv_data;
    int i;

    av_free(ctx->swap_buf);
407

408 409
    if (avctx->internal->is_copy)
        return 0;
410

Ramiro Polla's avatar
Ramiro Polla committed
411 412
    for(i = 0; i < 16; i++)
        if(ctx->buf_ptrs[i].data[0])
413
            ff_thread_release_buffer(avctx, &ctx->buf_ptrs[i]);
Ramiro Polla's avatar
Ramiro Polla committed
414
    free_vlc(&ctx->vlc);
Ramiro Polla's avatar
Ramiro Polla committed
415 416 417 418

    return 0;
}

419
AVCodec ff_mimic_decoder = {
420 421 422 423 424 425 426 427
    .name           = "mimic",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_MIMIC,
    .priv_data_size = sizeof(MimicContext),
    .init           = mimic_decode_init,
    .close          = mimic_decode_end,
    .decode         = mimic_decode_frame,
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
428
    .long_name = NULL_IF_CONFIG_SMALL("Mimic"),
429
    .update_thread_context = ONLY_IF_THREADS_ENABLED(mimic_decode_update_thread_context)
Ramiro Polla's avatar
Ramiro Polla committed
430
};