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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 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;
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 {
00089 int i, j;
00090 GetBitContext gb;
00091 VLC vlc;
00092 Node nodes[512];
00093
00094 for(i = 0; i < 256; i++)
00095 nodes[i].count = bytestream_get_le32(&src);
00096 size -= 1024;
00097 if (ff_huff_build_tree(s->avctx, &vlc, 256, nodes, huff_cmp, 0) < 0)
00098 return -1;
00099
00100
00101
00102 s->dsp.bswap_buf(s->tmpbuf, src, size >> 2);
00103
00104 init_get_bits(&gb, s->tmpbuf, size * 8);
00105 for(j = 0; j < h; j++){
00106 for(i = 0; i < w; i++){
00107 dst[i] = get_vlc2(&gb, vlc.table, 9, 3);
00108
00109
00110
00111 if(j) dst[i] += dst[i - stride];
00112 else if(Uoff) dst[i] += 0x80;
00113 }
00114 dst += stride;
00115 }
00116 free_vlc(&vlc);
00117 return 0;
00118 }
00119
00129 static int decode_frame(AVCodecContext *avctx,
00130 void *data, int *data_size,
00131 const uint8_t *buf, int buf_size)
00132 {
00133 FrapsContext * const s = avctx->priv_data;
00134 AVFrame *frame = data;
00135 AVFrame * const f = (AVFrame*)&s->frame;
00136 uint32_t header;
00137 unsigned int version,header_size;
00138 unsigned int x, y;
00139 const uint32_t *buf32;
00140 uint32_t *luma1,*luma2,*cb,*cr;
00141 uint32_t offs[4];
00142 int i, is_chroma, planes;
00143
00144
00145 header = AV_RL32(buf);
00146 version = header & 0xff;
00147 header_size = (header & (1<<30))? 8 : 4;
00148
00149 if (version > 2 && version != 4) {
00150 av_log(avctx, AV_LOG_ERROR,
00151 "This file is encoded with Fraps version %d. " \
00152 "This codec can only decode version 0, 1, 2 and 4.\n", version);
00153 return -1;
00154 }
00155
00156 buf+=4;
00157 if (header_size == 8)
00158 buf+=4;
00159
00160 switch(version) {
00161 case 0:
00162 default:
00163
00164 avctx->pix_fmt = PIX_FMT_YUV420P;
00165
00166 if ( (buf_size != avctx->width*avctx->height*3/2+header_size) &&
00167 (buf_size != header_size) ) {
00168 av_log(avctx, AV_LOG_ERROR,
00169 "Invalid frame length %d (should be %d)\n",
00170 buf_size, avctx->width*avctx->height*3/2+header_size);
00171 return -1;
00172 }
00173
00174 if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) {
00175 av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
00176 avctx->width, avctx->height);
00177 return -1;
00178 }
00179
00180 f->reference = 1;
00181 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00182 FF_BUFFER_HINTS_PRESERVE |
00183 FF_BUFFER_HINTS_REUSABLE;
00184 if (avctx->reget_buffer(avctx, f)) {
00185 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00186 return -1;
00187 }
00188
00189 f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
00190 f->key_frame = f->pict_type == FF_I_TYPE;
00191
00192 if (f->pict_type == FF_I_TYPE) {
00193 buf32=(const uint32_t*)buf;
00194 for(y=0; y<avctx->height/2; y++){
00195 luma1=(uint32_t*)&f->data[0][ y*2*f->linesize[0] ];
00196 luma2=(uint32_t*)&f->data[0][ (y*2+1)*f->linesize[0] ];
00197 cr=(uint32_t*)&f->data[1][ y*f->linesize[1] ];
00198 cb=(uint32_t*)&f->data[2][ y*f->linesize[2] ];
00199 for(x=0; x<avctx->width; x+=8){
00200 *(luma1++) = *(buf32++);
00201 *(luma1++) = *(buf32++);
00202 *(luma2++) = *(buf32++);
00203 *(luma2++) = *(buf32++);
00204 *(cr++) = *(buf32++);
00205 *(cb++) = *(buf32++);
00206 }
00207 }
00208 }
00209 break;
00210
00211 case 1:
00212
00213 avctx->pix_fmt = PIX_FMT_BGR24;
00214
00215 if ( (buf_size != avctx->width*avctx->height*3+header_size) &&
00216 (buf_size != header_size) ) {
00217 av_log(avctx, AV_LOG_ERROR,
00218 "Invalid frame length %d (should be %d)\n",
00219 buf_size, avctx->width*avctx->height*3+header_size);
00220 return -1;
00221 }
00222
00223 f->reference = 1;
00224 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00225 FF_BUFFER_HINTS_PRESERVE |
00226 FF_BUFFER_HINTS_REUSABLE;
00227 if (avctx->reget_buffer(avctx, f)) {
00228 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00229 return -1;
00230 }
00231
00232 f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
00233 f->key_frame = f->pict_type == FF_I_TYPE;
00234
00235 if (f->pict_type == FF_I_TYPE) {
00236 for(y=0; y<avctx->height; y++)
00237 memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ],
00238 &buf[y*avctx->width*3],
00239 f->linesize[0]);
00240 }
00241 break;
00242
00243 case 2:
00244 case 4:
00249 avctx->pix_fmt = PIX_FMT_YUV420P;
00250 planes = 3;
00251 f->reference = 1;
00252 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00253 FF_BUFFER_HINTS_PRESERVE |
00254 FF_BUFFER_HINTS_REUSABLE;
00255 if (avctx->reget_buffer(avctx, f)) {
00256 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00257 return -1;
00258 }
00259
00260 if(buf_size == 8) {
00261 f->pict_type = FF_P_TYPE;
00262 f->key_frame = 0;
00263 break;
00264 }
00265 f->pict_type = FF_I_TYPE;
00266 f->key_frame = 1;
00267 if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
00268 av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
00269 return -1;
00270 }
00271 for(i = 0; i < planes; i++) {
00272 offs[i] = AV_RL32(buf + 4 + i * 4);
00273 if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
00274 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
00275 return -1;
00276 }
00277 }
00278 offs[planes] = buf_size;
00279 for(i = 0; i < planes; i++){
00280 is_chroma = !!i;
00281 s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
00282 if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma,
00283 avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma) < 0) {
00284 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
00285 return -1;
00286 }
00287 }
00288 break;
00289 }
00290
00291 *frame = *f;
00292 *data_size = sizeof(AVFrame);
00293
00294 return buf_size;
00295 }
00296
00297
00303 static int decode_end(AVCodecContext *avctx)
00304 {
00305 FrapsContext *s = (FrapsContext*)avctx->priv_data;
00306
00307 if (s->frame.data[0])
00308 avctx->release_buffer(avctx, &s->frame);
00309
00310 av_freep(&s->tmpbuf);
00311 return 0;
00312 }
00313
00314
00315 AVCodec fraps_decoder = {
00316 "fraps",
00317 CODEC_TYPE_VIDEO,
00318 CODEC_ID_FRAPS,
00319 sizeof(FrapsContext),
00320 decode_init,
00321 NULL,
00322 decode_end,
00323 decode_frame,
00324 CODEC_CAP_DR1,
00325 };