libavcodec/fraps.c

   1 /*
   2  * Fraps FPS1 decoder
   3  * Copyright (c) 2005 Roine Gustafsson
   4  * Copyright (c) 2006 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  * Lossless Fraps 'FPS1' decoder
  26  * @author Roine Gustafsson (roine at users sf net)
  27  * @author Konstantin Shishkov
  28  *
  29  * Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
  30  *
  31  * Version 2 files support by Konstantin Shishkov
  32  */
  33
  34 #include "avcodec.h"
  35 #include "get_bits.h"
  36 #include "huffman.h"
  37 #include "bytestream.h"
  38 #include "dsputil.h"
  39
  40 #define FPS_TAG MKTAG('F', 'P', 'S', 'x')
  41
  42 /**
  43  * local variable storage
  44  */
  45 typedef struct FrapsContext{
  46     AVCodecContext *avctx;
  47     AVFrame frame;
  48     uint8_t *tmpbuf;
  49     DSPContext dsp;
  50 } FrapsContext;
  51
  52
  53 /**
  54  * initializes decoder
  55  * @param avctx codec context
  56  * @return 0 on success or negative if fails
  57  */
  58 static av_cold int decode_init(AVCodecContext *avctx)
  59 {
  60     FrapsContext * const s = avctx->priv_data;
  61
  62     avctx->coded_frame = (AVFrame*)&s->frame;
  63     avctx->pix_fmt= PIX_FMT_NONE; /* set in decode_frame */
  64
  65     s->avctx = avctx;
  66     s->tmpbuf = NULL;
  67
  68     dsputil_init(&s->dsp, avctx);
  69
  70     return 0;
  71 }
  72
  73 /**
  74  * Comparator - our nodes should ascend by count
  75  * but with preserved symbol order
  76  */
  77 static int huff_cmp(const void *va, const void *vb){
  78     const Node *a = va, *b = vb;
  79     return (a->count - b->count)*256 + a->sym - b->sym;
  80 }
  81
  82 /**
  83  * decode Fraps v2 packed plane
  84  */
  85 static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
  86                                int h, const uint8_t *src, int size, int Uoff,
  87                                const int step)
  88 {
  89     int i, j;
  90     GetBitContext gb;
  91     VLC vlc;
  92     Node nodes[512];
  93
  94     for(i = 0; i < 256; i++)
  95         nodes[i].count = bytestream_get_le32(&src);
  96     size -= 1024;
  97     if (ff_huff_build_tree(s->avctx, &vlc, 256, nodes, huff_cmp,
  98                            FF_HUFFMAN_FLAG_ZERO_COUNT) < 0)
  99         return -1;
 100     /* we have built Huffman table and are ready to decode plane */
 101
 102     /* convert bits so they may be used by standard bitreader */
 103     s->dsp.bswap_buf((uint32_t *)s->tmpbuf, (const uint32_t *)src, size >> 2);
 104
 105     init_get_bits(&gb, s->tmpbuf, size * 8);
 106     for(j = 0; j < h; j++){
 107         for(i = 0; i < w*step; i += step){
 108             dst[i] = get_vlc2(&gb, vlc.table, 9, 3);
 109             /* lines are stored as deltas between previous lines
 110              * and we need to add 0x80 to the first lines of chroma planes
 111              */
 112             if(j) dst[i] += dst[i - stride];
 113             else if(Uoff) dst[i] += 0x80;
 114         }
 115         dst += stride;
 116     }
 117     free_vlc(&vlc);
 118     return 0;
 119 }
 120
 121 /**
 122  * decode a frame
 123  * @param avctx codec context
 124  * @param data output AVFrame
 125  * @param data_size size of output data or 0 if no picture is returned
 126  * @return number of consumed bytes on success or negative if decode fails
 127  */
 128 static int decode_frame(AVCodecContext *avctx,
 129                         void *data, int *data_size,
 130                         AVPacket *avpkt)
 131 {
 132     const uint8_t *buf = avpkt->data;
 133     int buf_size = avpkt->size;
 134     FrapsContext * const s = avctx->priv_data;
 135     AVFrame *frame = data;
 136     AVFrame * const f = (AVFrame*)&s->frame;
 137     uint32_t header;
 138     unsigned int version,header_size;
 139     unsigned int x, y;
 140     const uint32_t *buf32;
 141     uint32_t *luma1,*luma2,*cb,*cr;
 142     uint32_t offs[4];
 143     int i, j, is_chroma, planes;
 144
 145
 146     header = AV_RL32(buf);
 147     version = header & 0xff;
 148     header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
 149
 150     if (version > 5) {
 151         av_log(avctx, AV_LOG_ERROR,
 152                "This file is encoded with Fraps version %d. " \
 153                "This codec can only decode versions <= 5.\n", version);
 154         return -1;
 155     }
 156
 157     buf+=4;
 158     if (header_size == 8)
 159         buf+=4;
 160
 161     switch(version) {
 162     case 0:
 163     default:
 164         /* Fraps v0 is a reordered YUV420 */
 165         avctx->pix_fmt = PIX_FMT_YUV420P;
 166
 167         if ( (buf_size != avctx->width*avctx->height*3/2+header_size) &&
 168              (buf_size != header_size) ) {
 169             av_log(avctx, AV_LOG_ERROR,
 170                    "Invalid frame length %d (should be %d)\n",
 171                    buf_size, avctx->width*avctx->height*3/2+header_size);
 172             return -1;
 173         }
 174
 175         if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) {
 176             av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
 177                    avctx->width, avctx->height);
 178             return -1;
 179         }
 180
 181         f->reference = 1;
 182         f->buffer_hints = FF_BUFFER_HINTS_VALID |
 183                           FF_BUFFER_HINTS_PRESERVE |
 184                           FF_BUFFER_HINTS_REUSABLE;
 185         if (avctx->reget_buffer(avctx, f)) {
 186             av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 187             return -1;
 188         }
 189         /* bit 31 means same as previous pic */
 190         f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
 191         f->key_frame = f->pict_type == FF_I_TYPE;
 192
 193         if (f->pict_type == FF_I_TYPE) {
 194             buf32=(const uint32_t*)buf;
 195             for(y=0; y<avctx->height/2; y++){
 196                 luma1=(uint32_t*)&f->data[0][ y*2*f->linesize[0] ];
 197                 luma2=(uint32_t*)&f->data[0][ (y*2+1)*f->linesize[0] ];
 198                 cr=(uint32_t*)&f->data[1][ y*f->linesize[1] ];
 199                 cb=(uint32_t*)&f->data[2][ y*f->linesize[2] ];
 200                 for(x=0; x<avctx->width; x+=8){
 201                     *(luma1++) = *(buf32++);
 202                     *(luma1++) = *(buf32++);
 203                     *(luma2++) = *(buf32++);
 204                     *(luma2++) = *(buf32++);
 205                     *(cr++) = *(buf32++);
 206                     *(cb++) = *(buf32++);
 207                 }
 208             }
 209         }
 210         break;
 211
 212     case 1:
 213         /* Fraps v1 is an upside-down BGR24 */
 214         avctx->pix_fmt = PIX_FMT_BGR24;
 215
 216         if ( (buf_size != avctx->width*avctx->height*3+header_size) &&
 217              (buf_size != header_size) ) {
 218             av_log(avctx, AV_LOG_ERROR,
 219                    "Invalid frame length %d (should be %d)\n",
 220                    buf_size, avctx->width*avctx->height*3+header_size);
 221             return -1;
 222         }
 223
 224         f->reference = 1;
 225         f->buffer_hints = FF_BUFFER_HINTS_VALID |
 226                           FF_BUFFER_HINTS_PRESERVE |
 227                           FF_BUFFER_HINTS_REUSABLE;
 228         if (avctx->reget_buffer(avctx, f)) {
 229             av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 230             return -1;
 231         }
 232         /* bit 31 means same as previous pic */
 233         f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
 234         f->key_frame = f->pict_type == FF_I_TYPE;
 235
 236         if (f->pict_type == FF_I_TYPE) {
 237             for(y=0; y<avctx->height; y++)
 238                 memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ],
 239                        &buf[y*avctx->width*3],
 240                        3*avctx->width);
 241         }
 242         break;
 243
 244     case 2:
 245     case 4:
 246         /**
 247          * Fraps v2 is Huffman-coded YUV420 planes
 248          * Fraps v4 is virtually the same
 249          */
 250         avctx->pix_fmt = PIX_FMT_YUV420P;
 251         planes = 3;
 252         f->reference = 1;
 253         f->buffer_hints = FF_BUFFER_HINTS_VALID |
 254                           FF_BUFFER_HINTS_PRESERVE |
 255                           FF_BUFFER_HINTS_REUSABLE;
 256         if (avctx->reget_buffer(avctx, f)) {
 257             av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 258             return -1;
 259         }
 260         /* skip frame */
 261         if(buf_size == 8) {
 262             f->pict_type = FF_P_TYPE;
 263             f->key_frame = 0;
 264             break;
 265         }
 266         f->pict_type = FF_I_TYPE;
 267         f->key_frame = 1;
 268         if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
 269             av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
 270             return -1;
 271         }
 272         for(i = 0; i < planes; i++) {
 273             offs[i] = AV_RL32(buf + 4 + i * 4);
 274             if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
 275                 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
 276                 return -1;
 277             }
 278         }
 279         offs[planes] = buf_size;
 280         for(i = 0; i < planes; i++){
 281             is_chroma = !!i;
 282             s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
 283             if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma,
 284                     avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma, 1) < 0) {
 285                 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
 286                 return -1;
 287             }
 288         }
 289         break;
 290     case 3:
 291     case 5:
 292         /* Virtually the same as version 4, but is for RGB24 */
 293         avctx->pix_fmt = PIX_FMT_BGR24;
 294         planes = 3;
 295         f->reference = 1;
 296         f->buffer_hints = FF_BUFFER_HINTS_VALID |
 297                           FF_BUFFER_HINTS_PRESERVE |
 298                           FF_BUFFER_HINTS_REUSABLE;
 299         if (avctx->reget_buffer(avctx, f)) {
 300             av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 301             return -1;
 302         }
 303         /* skip frame */
 304         if(buf_size == 8) {
 305             f->pict_type = FF_P_TYPE;
 306             f->key_frame = 0;
 307             break;
 308         }
 309         f->pict_type = FF_I_TYPE;
 310         f->key_frame = 1;
 311         if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
 312             av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
 313             return -1;
 314         }
 315         for(i = 0; i < planes; i++) {
 316             offs[i] = AV_RL32(buf + 4 + i * 4);
 317             if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
 318                 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
 319                 return -1;
 320             }
 321         }
 322         offs[planes] = buf_size;
 323         for(i = 0; i < planes; i++){
 324             s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
 325             if(fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)), -f->linesize[0],
 326                     avctx->width, avctx->height, buf + offs[i], offs[i + 1] - offs[i], 0, 3) < 0) {
 327                 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
 328                 return -1;
 329             }
 330         }
 331         // convert pseudo-YUV into real RGB
 332         for(j = 0; j < avctx->height; j++){
 333             for(i = 0; i < avctx->width; i++){
 334                 f->data[0][0 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
 335                 f->data[0][2 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
 336             }
 337         }
 338         break;
 339     }
 340
 341     *frame = *f;
 342     *data_size = sizeof(AVFrame);
 343
 344     return buf_size;
 345 }
 346
 347
 348 /**
 349  * closes decoder
 350  * @param avctx codec context
 351  * @return 0 on success or negative if fails
 352  */
 353 static av_cold int decode_end(AVCodecContext *avctx)
 354 {
 355     FrapsContext *s = (FrapsContext*)avctx->priv_data;
 356
 357     if (s->frame.data[0])
 358         avctx->release_buffer(avctx, &s->frame);
 359
 360     av_freep(&s->tmpbuf);
 361     return 0;
 362 }
 363
 364
 365 AVCodec fraps_decoder = {
 366     "fraps",
 367     AVMEDIA_TYPE_VIDEO,
 368     CODEC_ID_FRAPS,
 369     sizeof(FrapsContext),
 370     decode_init,
 371     NULL,
 372     decode_end,
 373     decode_frame,
 374     CODEC_CAP_DR1,
 375     .long_name = NULL_IF_CONFIG_SMALL("Fraps"),
 376 };