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00034 #include "avcodec.h"
00035 #include "get_bits.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;
00064
00065 s->avctx = avctx;
00066 s->tmpbuf = NULL;
00067
00068 dsputil_init(&s->dsp, avctx);
00069
00070 return 0;
00071 }
00072
00077 static int huff_cmp(const void *va, const void *vb){
00078 const Node *a = va, *b = vb;
00079 return (a->count - b->count)*256 + a->sym - b->sym;
00080 }
00081
00085 static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
00086 int h, const uint8_t *src, int size, int Uoff,
00087 const int step)
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,
00098 FF_HUFFMAN_FLAG_ZERO_COUNT) < 0)
00099 return -1;
00100
00101
00102
00103 s->dsp.bswap_buf((uint32_t *)s->tmpbuf, (const uint32_t *)src, size >> 2);
00104
00105 init_get_bits(&gb, s->tmpbuf, size * 8);
00106 for(j = 0; j < h; j++){
00107 for(i = 0; i < w*step; i += step){
00108 dst[i] = get_vlc2(&gb, vlc.table, 9, 3);
00109
00110
00111
00112 if(j) dst[i] += dst[i - stride];
00113 else if(Uoff) dst[i] += 0x80;
00114 }
00115 dst += stride;
00116 }
00117 free_vlc(&vlc);
00118 return 0;
00119 }
00120
00121 static int decode_frame(AVCodecContext *avctx,
00122 void *data, int *data_size,
00123 AVPacket *avpkt)
00124 {
00125 const uint8_t *buf = avpkt->data;
00126 int buf_size = avpkt->size;
00127 FrapsContext * const s = avctx->priv_data;
00128 AVFrame *frame = data;
00129 AVFrame * const f = (AVFrame*)&s->frame;
00130 uint32_t header;
00131 unsigned int version,header_size;
00132 unsigned int x, y;
00133 const uint32_t *buf32;
00134 uint32_t *luma1,*luma2,*cb,*cr;
00135 uint32_t offs[4];
00136 int i, j, is_chroma, planes;
00137
00138
00139 header = AV_RL32(buf);
00140 version = header & 0xff;
00141 header_size = (header & (1<<30))? 8 : 4;
00142
00143 if (version > 5) {
00144 av_log(avctx, AV_LOG_ERROR,
00145 "This file is encoded with Fraps version %d. " \
00146 "This codec can only decode versions <= 5.\n", version);
00147 return -1;
00148 }
00149
00150 buf+=4;
00151 if (header_size == 8)
00152 buf+=4;
00153
00154 switch(version) {
00155 case 0:
00156 default:
00157
00158 avctx->pix_fmt = PIX_FMT_YUVJ420P;
00159
00160 if ( (buf_size != avctx->width*avctx->height*3/2+header_size) &&
00161 (buf_size != header_size) ) {
00162 av_log(avctx, AV_LOG_ERROR,
00163 "Invalid frame length %d (should be %d)\n",
00164 buf_size, avctx->width*avctx->height*3/2+header_size);
00165 return -1;
00166 }
00167
00168 if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) {
00169 av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
00170 avctx->width, avctx->height);
00171 return -1;
00172 }
00173
00174 f->reference = 1;
00175 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00176 FF_BUFFER_HINTS_PRESERVE |
00177 FF_BUFFER_HINTS_REUSABLE;
00178 if (avctx->reget_buffer(avctx, f)) {
00179 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00180 return -1;
00181 }
00182
00183 f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
00184 f->key_frame = f->pict_type == FF_I_TYPE;
00185
00186 if (f->pict_type == FF_I_TYPE) {
00187 buf32=(const uint32_t*)buf;
00188 for(y=0; y<avctx->height/2; y++){
00189 luma1=(uint32_t*)&f->data[0][ y*2*f->linesize[0] ];
00190 luma2=(uint32_t*)&f->data[0][ (y*2+1)*f->linesize[0] ];
00191 cr=(uint32_t*)&f->data[1][ y*f->linesize[1] ];
00192 cb=(uint32_t*)&f->data[2][ y*f->linesize[2] ];
00193 for(x=0; x<avctx->width; x+=8){
00194 *(luma1++) = *(buf32++);
00195 *(luma1++) = *(buf32++);
00196 *(luma2++) = *(buf32++);
00197 *(luma2++) = *(buf32++);
00198 *(cr++) = *(buf32++);
00199 *(cb++) = *(buf32++);
00200 }
00201 }
00202 }
00203 break;
00204
00205 case 1:
00206
00207 avctx->pix_fmt = PIX_FMT_BGR24;
00208
00209 if ( (buf_size != avctx->width*avctx->height*3+header_size) &&
00210 (buf_size != header_size) ) {
00211 av_log(avctx, AV_LOG_ERROR,
00212 "Invalid frame length %d (should be %d)\n",
00213 buf_size, avctx->width*avctx->height*3+header_size);
00214 return -1;
00215 }
00216
00217 f->reference = 1;
00218 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00219 FF_BUFFER_HINTS_PRESERVE |
00220 FF_BUFFER_HINTS_REUSABLE;
00221 if (avctx->reget_buffer(avctx, f)) {
00222 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00223 return -1;
00224 }
00225
00226 f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
00227 f->key_frame = f->pict_type == FF_I_TYPE;
00228
00229 if (f->pict_type == FF_I_TYPE) {
00230 for(y=0; y<avctx->height; y++)
00231 memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ],
00232 &buf[y*avctx->width*3],
00233 3*avctx->width);
00234 }
00235 break;
00236
00237 case 2:
00238 case 4:
00243 avctx->pix_fmt = PIX_FMT_YUVJ420P;
00244 planes = 3;
00245 f->reference = 1;
00246 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00247 FF_BUFFER_HINTS_PRESERVE |
00248 FF_BUFFER_HINTS_REUSABLE;
00249 if (avctx->reget_buffer(avctx, f)) {
00250 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00251 return -1;
00252 }
00253
00254 if(buf_size == 8) {
00255 f->pict_type = FF_P_TYPE;
00256 f->key_frame = 0;
00257 break;
00258 }
00259 f->pict_type = FF_I_TYPE;
00260 f->key_frame = 1;
00261 if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
00262 av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
00263 return -1;
00264 }
00265 for(i = 0; i < planes; i++) {
00266 offs[i] = AV_RL32(buf + 4 + i * 4);
00267 if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
00268 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
00269 return -1;
00270 }
00271 }
00272 offs[planes] = buf_size;
00273 for(i = 0; i < planes; i++){
00274 is_chroma = !!i;
00275 s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
00276 if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma,
00277 avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma, 1) < 0) {
00278 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
00279 return -1;
00280 }
00281 }
00282 break;
00283 case 3:
00284 case 5:
00285
00286 avctx->pix_fmt = PIX_FMT_BGR24;
00287 planes = 3;
00288 f->reference = 1;
00289 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00290 FF_BUFFER_HINTS_PRESERVE |
00291 FF_BUFFER_HINTS_REUSABLE;
00292 if (avctx->reget_buffer(avctx, f)) {
00293 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00294 return -1;
00295 }
00296
00297 if(buf_size == 8) {
00298 f->pict_type = FF_P_TYPE;
00299 f->key_frame = 0;
00300 break;
00301 }
00302 f->pict_type = FF_I_TYPE;
00303 f->key_frame = 1;
00304 if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
00305 av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
00306 return -1;
00307 }
00308 for(i = 0; i < planes; i++) {
00309 offs[i] = AV_RL32(buf + 4 + i * 4);
00310 if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
00311 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
00312 return -1;
00313 }
00314 }
00315 offs[planes] = buf_size;
00316 for(i = 0; i < planes; i++){
00317 s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
00318 if(fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)), -f->linesize[0],
00319 avctx->width, avctx->height, buf + offs[i], offs[i + 1] - offs[i], 0, 3) < 0) {
00320 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
00321 return -1;
00322 }
00323 }
00324
00325 for(j = 0; j < avctx->height; j++){
00326 for(i = 0; i < avctx->width; i++){
00327 f->data[0][0 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
00328 f->data[0][2 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
00329 }
00330 }
00331 break;
00332 }
00333
00334 *frame = *f;
00335 *data_size = sizeof(AVFrame);
00336
00337 return buf_size;
00338 }
00339
00340
00346 static av_cold int decode_end(AVCodecContext *avctx)
00347 {
00348 FrapsContext *s = (FrapsContext*)avctx->priv_data;
00349
00350 if (s->frame.data[0])
00351 avctx->release_buffer(avctx, &s->frame);
00352
00353 av_freep(&s->tmpbuf);
00354 return 0;
00355 }
00356
00357
00358 AVCodec ff_fraps_decoder = {
00359 "fraps",
00360 AVMEDIA_TYPE_VIDEO,
00361 CODEC_ID_FRAPS,
00362 sizeof(FrapsContext),
00363 decode_init,
00364 NULL,
00365 decode_end,
00366 decode_frame,
00367 CODEC_CAP_DR1,
00368 .long_name = NULL_IF_CONFIG_SMALL("Fraps"),
00369 };