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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 if (get_bits_left(&gb) < 0) {
00115 ff_free_vlc(&vlc);
00116 return AVERROR_INVALIDDATA;
00117 }
00118 }
00119 dst += stride;
00120 }
00121 ff_free_vlc(&vlc);
00122 return 0;
00123 }
00124
00125 static int decode_frame(AVCodecContext *avctx,
00126 void *data, int *data_size,
00127 AVPacket *avpkt)
00128 {
00129 const uint8_t *buf = avpkt->data;
00130 int buf_size = avpkt->size;
00131 FrapsContext * const s = avctx->priv_data;
00132 AVFrame *frame = data;
00133 AVFrame * const f = (AVFrame*)&s->frame;
00134 uint32_t header;
00135 unsigned int version,header_size;
00136 unsigned int x, y;
00137 const uint32_t *buf32;
00138 uint32_t *luma1,*luma2,*cb,*cr;
00139 uint32_t offs[4];
00140 int i, j, is_chroma, planes;
00141 enum PixelFormat pix_fmt;
00142 int prev_pic_bit, expected_size;
00143
00144 if (buf_size < 4) {
00145 av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
00146 return AVERROR_INVALIDDATA;
00147 }
00148
00149 header = AV_RL32(buf);
00150 version = header & 0xff;
00151 header_size = (header & (1<<30))? 8 : 4;
00152 prev_pic_bit = header & (1U << 31);
00153
00154 if (version > 5) {
00155 av_log(avctx, AV_LOG_ERROR,
00156 "This file is encoded with Fraps version %d. " \
00157 "This codec can only decode versions <= 5.\n", version);
00158 return -1;
00159 }
00160
00161 buf+=4;
00162 if (header_size == 8)
00163 buf+=4;
00164
00165 pix_fmt = version & 1 ? PIX_FMT_BGR24 : PIX_FMT_YUVJ420P;
00166 if (avctx->pix_fmt != pix_fmt && f->data[0]) {
00167 avctx->release_buffer(avctx, f);
00168 }
00169 avctx->pix_fmt = pix_fmt;
00170
00171 expected_size = header_size;
00172
00173 switch (version) {
00174 case 0:
00175 default:
00176
00177 if (!prev_pic_bit)
00178 expected_size += avctx->width * avctx->height * 3 / 2;
00179 if (buf_size != expected_size) {
00180 av_log(avctx, AV_LOG_ERROR,
00181 "Invalid frame length %d (should be %d)\n",
00182 buf_size, expected_size);
00183 return AVERROR_INVALIDDATA;
00184 }
00185
00186 if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) {
00187 av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
00188 avctx->width, avctx->height);
00189 return -1;
00190 }
00191
00192 f->reference = 1;
00193 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00194 FF_BUFFER_HINTS_PRESERVE |
00195 FF_BUFFER_HINTS_REUSABLE;
00196 if (avctx->reget_buffer(avctx, f)) {
00197 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00198 return -1;
00199 }
00200 f->pict_type = prev_pic_bit ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
00201 f->key_frame = f->pict_type == AV_PICTURE_TYPE_I;
00202
00203 if (f->pict_type == AV_PICTURE_TYPE_I) {
00204 buf32=(const uint32_t*)buf;
00205 for(y=0; y<avctx->height/2; y++){
00206 luma1=(uint32_t*)&f->data[0][ y*2*f->linesize[0] ];
00207 luma2=(uint32_t*)&f->data[0][ (y*2+1)*f->linesize[0] ];
00208 cr=(uint32_t*)&f->data[1][ y*f->linesize[1] ];
00209 cb=(uint32_t*)&f->data[2][ y*f->linesize[2] ];
00210 for(x=0; x<avctx->width; x+=8){
00211 *(luma1++) = *(buf32++);
00212 *(luma1++) = *(buf32++);
00213 *(luma2++) = *(buf32++);
00214 *(luma2++) = *(buf32++);
00215 *(cr++) = *(buf32++);
00216 *(cb++) = *(buf32++);
00217 }
00218 }
00219 }
00220 break;
00221
00222 case 1:
00223
00224 if (!prev_pic_bit)
00225 expected_size += avctx->width * avctx->height * 3;
00226 if (buf_size != expected_size) {
00227 av_log(avctx, AV_LOG_ERROR,
00228 "Invalid frame length %d (should be %d)\n",
00229 buf_size, expected_size);
00230 return AVERROR_INVALIDDATA;
00231 }
00232
00233 f->reference = 1;
00234 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00235 FF_BUFFER_HINTS_PRESERVE |
00236 FF_BUFFER_HINTS_REUSABLE;
00237 if (avctx->reget_buffer(avctx, f)) {
00238 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00239 return -1;
00240 }
00241 f->pict_type = prev_pic_bit ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
00242 f->key_frame = f->pict_type == AV_PICTURE_TYPE_I;
00243
00244 if (f->pict_type == AV_PICTURE_TYPE_I) {
00245 for(y=0; y<avctx->height; y++)
00246 memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ],
00247 &buf[y*avctx->width*3],
00248 3*avctx->width);
00249 }
00250 break;
00251
00252 case 2:
00253 case 4:
00258 planes = 3;
00259 f->reference = 1;
00260 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00261 FF_BUFFER_HINTS_PRESERVE |
00262 FF_BUFFER_HINTS_REUSABLE;
00263 if (avctx->reget_buffer(avctx, f)) {
00264 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00265 return -1;
00266 }
00267
00268 if(buf_size == 8) {
00269 f->pict_type = AV_PICTURE_TYPE_P;
00270 f->key_frame = 0;
00271 break;
00272 }
00273 f->pict_type = AV_PICTURE_TYPE_I;
00274 f->key_frame = 1;
00275 if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
00276 av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
00277 return -1;
00278 }
00279 for(i = 0; i < planes; i++) {
00280 offs[i] = AV_RL32(buf + 4 + i * 4);
00281 if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
00282 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
00283 return -1;
00284 }
00285 }
00286 offs[planes] = buf_size;
00287 for(i = 0; i < planes; i++){
00288 is_chroma = !!i;
00289 s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
00290 if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma,
00291 avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma, 1) < 0) {
00292 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
00293 return -1;
00294 }
00295 }
00296 break;
00297 case 3:
00298 case 5:
00299
00300 planes = 3;
00301 f->reference = 1;
00302 f->buffer_hints = FF_BUFFER_HINTS_VALID |
00303 FF_BUFFER_HINTS_PRESERVE |
00304 FF_BUFFER_HINTS_REUSABLE;
00305 if (avctx->reget_buffer(avctx, f)) {
00306 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
00307 return -1;
00308 }
00309
00310 if(buf_size == 8) {
00311 f->pict_type = AV_PICTURE_TYPE_P;
00312 f->key_frame = 0;
00313 break;
00314 }
00315 f->pict_type = AV_PICTURE_TYPE_I;
00316 f->key_frame = 1;
00317 if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
00318 av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
00319 return -1;
00320 }
00321 for(i = 0; i < planes; i++) {
00322 offs[i] = AV_RL32(buf + 4 + i * 4);
00323 if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
00324 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
00325 return -1;
00326 }
00327 }
00328 offs[planes] = buf_size;
00329 for(i = 0; i < planes; i++){
00330 s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
00331 if(fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)), -f->linesize[0],
00332 avctx->width, avctx->height, buf + offs[i], offs[i + 1] - offs[i], 0, 3) < 0) {
00333 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
00334 return -1;
00335 }
00336 }
00337
00338 for(j = 0; j < avctx->height; j++){
00339 for(i = 0; i < avctx->width; i++){
00340 f->data[0][0 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
00341 f->data[0][2 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
00342 }
00343 }
00344 break;
00345 }
00346
00347 *frame = *f;
00348 *data_size = sizeof(AVFrame);
00349
00350 return buf_size;
00351 }
00352
00353
00359 static av_cold int decode_end(AVCodecContext *avctx)
00360 {
00361 FrapsContext *s = (FrapsContext*)avctx->priv_data;
00362
00363 if (s->frame.data[0])
00364 avctx->release_buffer(avctx, &s->frame);
00365
00366 av_freep(&s->tmpbuf);
00367 return 0;
00368 }
00369
00370
00371 AVCodec ff_fraps_decoder = {
00372 .name = "fraps",
00373 .type = AVMEDIA_TYPE_VIDEO,
00374 .id = CODEC_ID_FRAPS,
00375 .priv_data_size = sizeof(FrapsContext),
00376 .init = decode_init,
00377 .close = decode_end,
00378 .decode = decode_frame,
00379 .capabilities = CODEC_CAP_DR1,
00380 .long_name = NULL_IF_CONFIG_SMALL("Fraps"),
00381 };