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* Copyright (c) 2005 Roine Gustafsson
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* Copyright (c) 2006 Konstantin Shishkov
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* Lossless Fraps 'FPS1' decoder
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* @author Roine Gustafsson <roine at users sf net>
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* @author Konstantin Shishkov
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* Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
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* Version 2 files support by Konstantin Shishkov
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#include "bitstream.h"
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#define FPS_TAG MKTAG('F', 'P', 'S', 'x')
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/* symbol for Huffman tree node */
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* FIXME one day this should belong to one general framework
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* local variable storage
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typedef struct FrapsContext{
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AVCodecContext *avctx;
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* @param avctx codec context
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* @return 0 on success or negative if fails
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static int decode_init(AVCodecContext *avctx)
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FrapsContext * const s = avctx->priv_data;
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avctx->coded_frame = (AVFrame*)&s->frame;
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avctx->has_b_frames = 0;
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avctx->pix_fmt= PIX_FMT_NONE; /* set in decode_frame */
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s->frame.data[0] = NULL;
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dsputil_init(&s->dsp, avctx);
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* Comparator - our nodes should ascend by count
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* but with preserved symbol order
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static int huff_cmp(const Node *a, const Node *b){
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return (a->count - b->count)*256 + a->sym - b->sym;
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static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat, Node *nodes, int node, uint32_t pfx, int pl, int *pos)
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if(s != HNODE || !nodes[node].count){
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get_tree_codes(bits, lens, xlat, nodes, nodes[node].n0, pfx, pl, pos);
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get_tree_codes(bits, lens, xlat, nodes, nodes[node].n0+1, pfx, pl, pos);
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static int build_huff_tree(VLC *vlc, Node *nodes, uint8_t *xlat)
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get_tree_codes(bits, lens, xlat, nodes, 510, 0, 0, &pos);
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return init_vlc(vlc, 9, pos, lens, 2, 2, bits, 4, 4, 0);
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* decode Fraps v2 packed plane
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static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
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int h, uint8_t *src, int size, int Uoff)
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for(i = 0; i < 256; i++){
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s->nodes[i].count = AV_RL32(src);
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if(s->nodes[i].count < 0) {
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av_log(s->avctx, AV_LOG_ERROR, "Symbol count < 0\n");
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sum += s->nodes[i].count;
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av_log(s->avctx, AV_LOG_ERROR, "Too high symbol frequencies. Tree construction is not possible\n");
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qsort(s->nodes, 256, sizeof(Node), huff_cmp);
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for(i = 0; i < 511; i += 2){
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s->nodes[cur_node].sym = HNODE;
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s->nodes[cur_node].count = s->nodes[i].count + s->nodes[i+1].count;
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s->nodes[cur_node].n0 = i;
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for(j = cur_node; j > 0; j--){
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if(s->nodes[j].count >= s->nodes[j - 1].count) break;
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FFSWAP(Node, s->nodes[j], s->nodes[j - 1]);
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if(build_huff_tree(&vlc, s->nodes, recode) < 0){
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av_log(s->avctx, AV_LOG_ERROR, "Error building tree\n");
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/* we have built Huffman table and are ready to decode plane */
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/* convert bits so they may be used by standard bitreader */
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s->dsp.bswap_buf(s->tmpbuf, src, size >> 2);
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init_get_bits(&gb, s->tmpbuf, size * 8);
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for(j = 0; j < h; j++){
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for(i = 0; i < w; i++){
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dst[i] = recode[get_vlc2(&gb, vlc.table, 9, 3)];
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/* lines are stored as deltas between previous lines
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* and we need to add 0x80 to the first lines of chroma planes
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if(j) dst[i] += dst[i - stride];
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else if(Uoff) dst[i] += 0x80;
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* @param avctx codec context
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* @param data output AVFrame
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* @param data_size size of output data or 0 if no picture is returned
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* @param buf input data frame
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* @param buf_size size of input data frame
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* @return number of consumed bytes on success or negative if decode fails
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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uint8_t *buf, int buf_size)
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FrapsContext * const s = avctx->priv_data;
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AVFrame *frame = data;
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AVFrame * const f = (AVFrame*)&s->frame;
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unsigned int version,header_size;
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uint32_t *luma1,*luma2,*cb,*cr;
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int i, is_chroma, planes;
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header = AV_RL32(buf);
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version = header & 0xff;
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header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
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if (version > 2 && version != 4) {
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av_log(avctx, AV_LOG_ERROR,
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"This file is encoded with Fraps version %d. " \
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"This codec can only decode version 0, 1, 2 and 4.\n", version);
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if (header_size == 8)
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/* Fraps v0 is a reordered YUV420 */
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avctx->pix_fmt = PIX_FMT_YUV420P;
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if ( (buf_size != avctx->width*avctx->height*3/2+header_size) &&
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(buf_size != header_size) ) {
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av_log(avctx, AV_LOG_ERROR,
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"Invalid frame length %d (should be %d)\n",
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buf_size, avctx->width*avctx->height*3/2+header_size);
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if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) {
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av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
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avctx->width, avctx->height);
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f->buffer_hints = FF_BUFFER_HINTS_VALID |
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FF_BUFFER_HINTS_PRESERVE |
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FF_BUFFER_HINTS_REUSABLE;
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if (avctx->reget_buffer(avctx, f)) {
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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/* bit 31 means same as previous pic */
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f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
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f->key_frame = f->pict_type == FF_I_TYPE;
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if (f->pict_type == FF_I_TYPE) {
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buf32=(uint32_t*)buf;
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for(y=0; y<avctx->height/2; y++){
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luma1=(uint32_t*)&f->data[0][ y*2*f->linesize[0] ];
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luma2=(uint32_t*)&f->data[0][ (y*2+1)*f->linesize[0] ];
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cr=(uint32_t*)&f->data[1][ y*f->linesize[1] ];
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cb=(uint32_t*)&f->data[2][ y*f->linesize[2] ];
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for(x=0; x<avctx->width; x+=8){
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*(luma1++) = *(buf32++);
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*(luma1++) = *(buf32++);
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*(luma2++) = *(buf32++);
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*(luma2++) = *(buf32++);
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*(cr++) = *(buf32++);
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*(cb++) = *(buf32++);
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/* Fraps v1 is an upside-down BGR24 */
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avctx->pix_fmt = PIX_FMT_BGR24;
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if ( (buf_size != avctx->width*avctx->height*3+header_size) &&
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(buf_size != header_size) ) {
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av_log(avctx, AV_LOG_ERROR,
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"Invalid frame length %d (should be %d)\n",
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buf_size, avctx->width*avctx->height*3+header_size);
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f->buffer_hints = FF_BUFFER_HINTS_VALID |
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FF_BUFFER_HINTS_PRESERVE |
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FF_BUFFER_HINTS_REUSABLE;
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if (avctx->reget_buffer(avctx, f)) {
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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/* bit 31 means same as previous pic */
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f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
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f->key_frame = f->pict_type == FF_I_TYPE;
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if (f->pict_type == FF_I_TYPE) {
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for(y=0; y<avctx->height; y++)
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memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ],
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&buf[y*avctx->width*3],
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* Fraps v2 is Huffman-coded YUV420 planes
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* Fraps v4 is virtually the same
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avctx->pix_fmt = PIX_FMT_YUV420P;
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f->buffer_hints = FF_BUFFER_HINTS_VALID |
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FF_BUFFER_HINTS_PRESERVE |
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FF_BUFFER_HINTS_REUSABLE;
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if (avctx->reget_buffer(avctx, f)) {
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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f->pict_type = FF_P_TYPE;
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f->pict_type = FF_I_TYPE;
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if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
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av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
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for(i = 0; i < planes; i++) {
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offs[i] = AV_RL32(buf + 4 + i * 4);
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if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
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av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
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offs[planes] = buf_size;
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for(i = 0; i < planes; i++){
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s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
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if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma,
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avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma) < 0) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
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*data_size = sizeof(AVFrame);
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* @param avctx codec context
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* @return 0 on success or negative if fails
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static int decode_end(AVCodecContext *avctx)
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FrapsContext *s = (FrapsContext*)avctx->priv_data;
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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av_freep(&s->tmpbuf);
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AVCodec fraps_decoder = {
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sizeof(FrapsContext),