FFmpeg: libavcodec/fraps.c Source File

00001 /*
00002  * Fraps FPS1 decoder
00003  * Copyright (c) 2005 Roine Gustafsson
00004  * Copyright (c) 2006 Konstantin Shishkov
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00034 #include "avcodec.h"
00035 #include "bitstream.h"
00036 #include "huffman.h"
00037 #include "bytestream.h"
00038 #include "dsputil.h"
00039 
00040 #define FPS_TAG MKTAG('F', 'P', 'S', 'x')
00041 
00045 typedef struct FrapsContext{
00046     AVCodecContext *avctx;
00047     AVFrame frame;
00048     uint8_t *tmpbuf;
00049     DSPContext dsp;
00050 } FrapsContext;
00051 
00052 
00058 static av_cold int decode_init(AVCodecContext *avctx)
00059 {
00060     FrapsContext * const s = avctx->priv_data;
00061 
00062     avctx->coded_frame = (AVFrame*)&s->frame;
00063     avctx->pix_fmt= PIX_FMT_NONE; /* set in decode_frame */
00064 
00065     s->avctx = avctx;
00066     s->frame.data[0] = NULL;
00067     s->tmpbuf = NULL;
00068 
00069     dsputil_init(&s->dsp, avctx);
00070 
00071     return 0;
00072 }
00073 
00078 static int huff_cmp(const void *va, const void *vb){
00079     const Node *a = va, *b = vb;
00080     return (a->count - b->count)*256 + a->sym - b->sym;
00081 }
00082 
00086 static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
00087                                int h, const uint8_t *src, int size, int Uoff,
00088                                const int step)
00089 {
00090     int i, j;
00091     GetBitContext gb;
00092     VLC vlc;
00093     Node nodes[512];
00094 
00095     for(i = 0; i < 256; i++)
00096         nodes[i].count = bytestream_get_le32(&src);
00097     size -= 1024;
00098     if (ff_huff_build_tree(s->avctx, &vlc, 256, nodes, huff_cmp,
00099                            FF_HUFFMAN_FLAG_ZERO_COUNT) < 0)
00100         return -1;
00101     /* we have built Huffman table and are ready to decode plane */
00102 
00103     /* convert bits so they may be used by standard bitreader */
00104     s->dsp.bswap_buf((uint32_t *)s->tmpbuf, (const uint32_t *)src, size >> 2);
00105 
00106     init_get_bits(&gb, s->tmpbuf, size * 8);
00107     for(j = 0; j < h; j++){
00108         for(i = 0; i < w*step; i += step){
00109             dst[i] = get_vlc2(&gb, vlc.table, 9, 3);
00110             /* lines are stored as deltas between previous lines
00111              * and we need to add 0x80 to the first lines of chroma planes
00112              */
00113             if(j) dst[i] += dst[i - stride];
00114             else if(Uoff) dst[i] += 0x80;
00115         }
00116         dst += stride;
00117     }
00118     free_vlc(&vlc);
00119     return 0;
00120 }
00121 
00131 static int decode_frame(AVCodecContext *avctx,
00132                         void *data, int *data_size,
00133                         const uint8_t *buf, int buf_size)
00134 {
00135     FrapsContext * const s = avctx->priv_data;
00136     AVFrame *frame = data;
00137     AVFrame * const f = (AVFrame*)&s->frame;
00138     uint32_t header;
00139     unsigned int version,header_size;
00140     unsigned int x, y;
00141     const uint32_t *buf32;
00142     uint32_t *luma1,*luma2,*cb,*cr;
00143     uint32_t offs[4];
00144     int i, j, is_chroma, planes;
00145 
00146 
00147     header = AV_RL32(buf);
00148     version = header & 0xff;
00149     header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
00150 
00151     if (version > 5) {
00152         av_log(avctx, AV_LOG_ERROR,
00153                "This file is encoded with Fraps version %d. " \
00154                "This codec can only decode versions <= 5.\n", version);
00155         return -1;
00156     }
00157 
00158     buf+=4;
00159     if (header_size == 8)
00160         buf+=4;
00161 
00162     switch(version) {
00163     case 0:
00164     default:
00165         /* Fraps v0 is a reordered YUV420 */
00166         avctx->pix_fmt = PIX_FMT_YUV420P;
00167 
00168         if ( (buf_size != avctx->width*avctx->height*3/2+header_size) &&
00169              (buf_size != header_size) ) {
00170             av_log(avctx, AV_LOG_ERROR,
00171                    "Invalid frame length %d (should be %d)\n",
00172                    buf_size, avctx->width*avctx->height*3/2+header_size);
00173             return -1;
00174         }
00175 
00176         if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) {
00177             av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
00178                    avctx->width, avctx->height);
00179             return -1;
00180         }
00181 
00182         f->reference = 1;
00183         f->buffer_hints = FF_BUFFER_HINTS_VALID |
00184                           FF_BUFFER_HINTS_PRESERVE |
00185                           FF_BUFFER_HINTS_REUSABLE;
00186         if (avctx->reget_buffer(avctx, f)) {
00187             av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00188             return -1;
00189         }
00190         /* bit 31 means same as previous pic */
00191         f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
00192         f->key_frame = f->pict_type == FF_I_TYPE;
00193 
00194         if (f->pict_type == FF_I_TYPE) {
00195             buf32=(const uint32_t*)buf;
00196             for(y=0; y<avctx->height/2; y++){
00197                 luma1=(uint32_t*)&f->data[0][ y*2*f->linesize[0] ];
00198                 luma2=(uint32_t*)&f->data[0][ (y*2+1)*f->linesize[0] ];
00199                 cr=(uint32_t*)&f->data[1][ y*f->linesize[1] ];
00200                 cb=(uint32_t*)&f->data[2][ y*f->linesize[2] ];
00201                 for(x=0; x<avctx->width; x+=8){
00202                     *(luma1++) = *(buf32++);
00203                     *(luma1++) = *(buf32++);
00204                     *(luma2++) = *(buf32++);
00205                     *(luma2++) = *(buf32++);
00206                     *(cr++) = *(buf32++);
00207                     *(cb++) = *(buf32++);
00208                 }
00209             }
00210         }
00211         break;
00212 
00213     case 1:
00214         /* Fraps v1 is an upside-down BGR24 */
00215         avctx->pix_fmt = PIX_FMT_BGR24;
00216 
00217         if ( (buf_size != avctx->width*avctx->height*3+header_size) &&
00218              (buf_size != header_size) ) {
00219             av_log(avctx, AV_LOG_ERROR,
00220                    "Invalid frame length %d (should be %d)\n",
00221                    buf_size, avctx->width*avctx->height*3+header_size);
00222             return -1;
00223         }
00224 
00225         f->reference = 1;
00226         f->buffer_hints = FF_BUFFER_HINTS_VALID |
00227                           FF_BUFFER_HINTS_PRESERVE |
00228                           FF_BUFFER_HINTS_REUSABLE;
00229         if (avctx->reget_buffer(avctx, f)) {
00230             av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00231             return -1;
00232         }
00233         /* bit 31 means same as previous pic */
00234         f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
00235         f->key_frame = f->pict_type == FF_I_TYPE;
00236 
00237         if (f->pict_type == FF_I_TYPE) {
00238             for(y=0; y<avctx->height; y++)
00239                 memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ],
00240                        &buf[y*avctx->width*3],
00241                        f->linesize[0]);
00242         }
00243         break;
00244 
00245     case 2:
00246     case 4:
00251         avctx->pix_fmt = PIX_FMT_YUV420P;
00252         planes = 3;
00253         f->reference = 1;
00254         f->buffer_hints = FF_BUFFER_HINTS_VALID |
00255                           FF_BUFFER_HINTS_PRESERVE |
00256                           FF_BUFFER_HINTS_REUSABLE;
00257         if (avctx->reget_buffer(avctx, f)) {
00258             av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00259             return -1;
00260         }
00261         /* skip frame */
00262         if(buf_size == 8) {
00263             f->pict_type = FF_P_TYPE;
00264             f->key_frame = 0;
00265             break;
00266         }
00267         f->pict_type = FF_I_TYPE;
00268         f->key_frame = 1;
00269         if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
00270             av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
00271             return -1;
00272         }
00273         for(i = 0; i < planes; i++) {
00274             offs[i] = AV_RL32(buf + 4 + i * 4);
00275             if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
00276                 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
00277                 return -1;
00278             }
00279         }
00280         offs[planes] = buf_size;
00281         for(i = 0; i < planes; i++){
00282             is_chroma = !!i;
00283             s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
00284             if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma,
00285                     avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma, 1) < 0) {
00286                 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
00287                 return -1;
00288             }
00289         }
00290         break;
00291     case 3:
00292     case 5:
00293         /* Virtually the same as version 4, but is for RGB24 */
00294         avctx->pix_fmt = PIX_FMT_BGR24;
00295         planes = 3;
00296         f->reference = 1;
00297         f->buffer_hints = FF_BUFFER_HINTS_VALID |
00298                           FF_BUFFER_HINTS_PRESERVE |
00299                           FF_BUFFER_HINTS_REUSABLE;
00300         if (avctx->reget_buffer(avctx, f)) {
00301             av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00302             return -1;
00303         }
00304         /* skip frame */
00305         if(buf_size == 8) {
00306             f->pict_type = FF_P_TYPE;
00307             f->key_frame = 0;
00308             break;
00309         }
00310         f->pict_type = FF_I_TYPE;
00311         f->key_frame = 1;
00312         if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
00313             av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
00314             return -1;
00315         }
00316         for(i = 0; i < planes; i++) {
00317             offs[i] = AV_RL32(buf + 4 + i * 4);
00318             if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
00319                 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
00320                 return -1;
00321             }
00322         }
00323         offs[planes] = buf_size;
00324         for(i = 0; i < planes; i++){
00325             s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
00326             if(fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)), -f->linesize[0],
00327                     avctx->width, avctx->height, buf + offs[i], offs[i + 1] - offs[i], 0, 3) < 0) {
00328                 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
00329                 return -1;
00330             }
00331         }
00332         // convert pseudo-YUV into real RGB
00333         for(j = 0; j < avctx->height; j++){
00334             for(i = 0; i < avctx->width; i++){
00335                 f->data[0][0 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
00336                 f->data[0][2 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
00337             }
00338         }
00339         break;
00340     }
00341 
00342     *frame = *f;
00343     *data_size = sizeof(AVFrame);
00344 
00345     return buf_size;
00346 }
00347 
00348 
00354 static av_cold int decode_end(AVCodecContext *avctx)
00355 {
00356     FrapsContext *s = (FrapsContext*)avctx->priv_data;
00357 
00358     if (s->frame.data[0])
00359         avctx->release_buffer(avctx, &s->frame);
00360 
00361     av_freep(&s->tmpbuf);
00362     return 0;
00363 }
00364 
00365 
00366 AVCodec fraps_decoder = {
00367     "fraps",
00368     CODEC_TYPE_VIDEO,
00369     CODEC_ID_FRAPS,
00370     sizeof(FrapsContext),
00371     decode_init,
00372     NULL,
00373     decode_end,
00374     decode_frame,
00375     CODEC_CAP_DR1,
00376     .long_name = NULL_IF_CONFIG_SMALL("Fraps"),
00377 };