3 * Copyright (c) 2005 Roine Gustafsson
4 * Copyright (c) 2006 Konstantin Shishkov
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * @file libavcodec/fraps.c
25 * Lossless Fraps 'FPS1' decoder
26 * @author Roine Gustafsson <roine at users sf net>
27 * @author Konstantin Shishkov
29 * Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
31 * Version 2 files support by Konstantin Shishkov
37 #include "bytestream.h"
40 #define FPS_TAG MKTAG('F', 'P', 'S', 'x')
43 * local variable storage
45 typedef struct FrapsContext{
46 AVCodecContext *avctx;
55 * @param avctx codec context
56 * @return 0 on success or negative if fails
58 static av_cold int decode_init(AVCodecContext *avctx)
60 FrapsContext * const s = avctx->priv_data;
62 avctx->coded_frame = (AVFrame*)&s->frame;
63 avctx->pix_fmt= PIX_FMT_NONE; /* set in decode_frame */
66 s->frame.data[0] = NULL;
69 dsputil_init(&s->dsp, avctx);
75 * Comparator - our nodes should ascend by count
76 * but with preserved symbol order
78 static int huff_cmp(const void *va, const void *vb){
79 const Node *a = va, *b = vb;
80 return (a->count - b->count)*256 + a->sym - b->sym;
84 * decode Fraps v2 packed plane
86 static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
87 int h, const uint8_t *src, int size, int Uoff,
95 for(i = 0; i < 256; i++)
96 nodes[i].count = bytestream_get_le32(&src);
98 if (ff_huff_build_tree(s->avctx, &vlc, 256, nodes, huff_cmp,
99 FF_HUFFMAN_FLAG_ZERO_COUNT) < 0)
101 /* we have built Huffman table and are ready to decode plane */
103 /* convert bits so they may be used by standard bitreader */
104 s->dsp.bswap_buf((uint32_t *)s->tmpbuf, (const uint32_t *)src, size >> 2);
106 init_get_bits(&gb, s->tmpbuf, size * 8);
107 for(j = 0; j < h; j++){
108 for(i = 0; i < w*step; i += step){
109 dst[i] = get_vlc2(&gb, vlc.table, 9, 3);
110 /* lines are stored as deltas between previous lines
111 * and we need to add 0x80 to the first lines of chroma planes
113 if(j) dst[i] += dst[i - stride];
114 else if(Uoff) dst[i] += 0x80;
124 * @param avctx codec context
125 * @param data output AVFrame
126 * @param data_size size of output data or 0 if no picture is returned
127 * @param buf input data frame
128 * @param buf_size size of input data frame
129 * @return number of consumed bytes on success or negative if decode fails
131 static int decode_frame(AVCodecContext *avctx,
132 void *data, int *data_size,
135 const uint8_t *buf = avpkt->data;
136 int buf_size = avpkt->size;
137 FrapsContext * const s = avctx->priv_data;
138 AVFrame *frame = data;
139 AVFrame * const f = (AVFrame*)&s->frame;
141 unsigned int version,header_size;
143 const uint32_t *buf32;
144 uint32_t *luma1,*luma2,*cb,*cr;
146 int i, j, is_chroma, planes;
149 header = AV_RL32(buf);
150 version = header & 0xff;
151 header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
154 av_log(avctx, AV_LOG_ERROR,
155 "This file is encoded with Fraps version %d. " \
156 "This codec can only decode versions <= 5.\n", version);
161 if (header_size == 8)
167 /* Fraps v0 is a reordered YUV420 */
168 avctx->pix_fmt = PIX_FMT_YUV420P;
170 if ( (buf_size != avctx->width*avctx->height*3/2+header_size) &&
171 (buf_size != header_size) ) {
172 av_log(avctx, AV_LOG_ERROR,
173 "Invalid frame length %d (should be %d)\n",
174 buf_size, avctx->width*avctx->height*3/2+header_size);
178 if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) {
179 av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
180 avctx->width, avctx->height);
185 f->buffer_hints = FF_BUFFER_HINTS_VALID |
186 FF_BUFFER_HINTS_PRESERVE |
187 FF_BUFFER_HINTS_REUSABLE;
188 if (avctx->reget_buffer(avctx, f)) {
189 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
192 /* bit 31 means same as previous pic */
193 f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
194 f->key_frame = f->pict_type == FF_I_TYPE;
196 if (f->pict_type == FF_I_TYPE) {
197 buf32=(const uint32_t*)buf;
198 for(y=0; y<avctx->height/2; y++){
199 luma1=(uint32_t*)&f->data[0][ y*2*f->linesize[0] ];
200 luma2=(uint32_t*)&f->data[0][ (y*2+1)*f->linesize[0] ];
201 cr=(uint32_t*)&f->data[1][ y*f->linesize[1] ];
202 cb=(uint32_t*)&f->data[2][ y*f->linesize[2] ];
203 for(x=0; x<avctx->width; x+=8){
204 *(luma1++) = *(buf32++);
205 *(luma1++) = *(buf32++);
206 *(luma2++) = *(buf32++);
207 *(luma2++) = *(buf32++);
208 *(cr++) = *(buf32++);
209 *(cb++) = *(buf32++);
216 /* Fraps v1 is an upside-down BGR24 */
217 avctx->pix_fmt = PIX_FMT_BGR24;
219 if ( (buf_size != avctx->width*avctx->height*3+header_size) &&
220 (buf_size != header_size) ) {
221 av_log(avctx, AV_LOG_ERROR,
222 "Invalid frame length %d (should be %d)\n",
223 buf_size, avctx->width*avctx->height*3+header_size);
228 f->buffer_hints = FF_BUFFER_HINTS_VALID |
229 FF_BUFFER_HINTS_PRESERVE |
230 FF_BUFFER_HINTS_REUSABLE;
231 if (avctx->reget_buffer(avctx, f)) {
232 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
235 /* bit 31 means same as previous pic */
236 f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
237 f->key_frame = f->pict_type == FF_I_TYPE;
239 if (f->pict_type == FF_I_TYPE) {
240 for(y=0; y<avctx->height; y++)
241 memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ],
242 &buf[y*avctx->width*3],
250 * Fraps v2 is Huffman-coded YUV420 planes
251 * Fraps v4 is virtually the same
253 avctx->pix_fmt = PIX_FMT_YUV420P;
256 f->buffer_hints = FF_BUFFER_HINTS_VALID |
257 FF_BUFFER_HINTS_PRESERVE |
258 FF_BUFFER_HINTS_REUSABLE;
259 if (avctx->reget_buffer(avctx, f)) {
260 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
265 f->pict_type = FF_P_TYPE;
269 f->pict_type = FF_I_TYPE;
271 if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
272 av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
275 for(i = 0; i < planes; i++) {
276 offs[i] = AV_RL32(buf + 4 + i * 4);
277 if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
278 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
282 offs[planes] = buf_size;
283 for(i = 0; i < planes; i++){
285 s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
286 if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma,
287 avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma, 1) < 0) {
288 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
295 /* Virtually the same as version 4, but is for RGB24 */
296 avctx->pix_fmt = PIX_FMT_BGR24;
299 f->buffer_hints = FF_BUFFER_HINTS_VALID |
300 FF_BUFFER_HINTS_PRESERVE |
301 FF_BUFFER_HINTS_REUSABLE;
302 if (avctx->reget_buffer(avctx, f)) {
303 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
308 f->pict_type = FF_P_TYPE;
312 f->pict_type = FF_I_TYPE;
314 if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
315 av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
318 for(i = 0; i < planes; i++) {
319 offs[i] = AV_RL32(buf + 4 + i * 4);
320 if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
321 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
325 offs[planes] = buf_size;
326 for(i = 0; i < planes; i++){
327 s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
328 if(fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)), -f->linesize[0],
329 avctx->width, avctx->height, buf + offs[i], offs[i + 1] - offs[i], 0, 3) < 0) {
330 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
334 // convert pseudo-YUV into real RGB
335 for(j = 0; j < avctx->height; j++){
336 for(i = 0; i < avctx->width; i++){
337 f->data[0][0 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
338 f->data[0][2 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
345 *data_size = sizeof(AVFrame);
353 * @param avctx codec context
354 * @return 0 on success or negative if fails
356 static av_cold int decode_end(AVCodecContext *avctx)
358 FrapsContext *s = (FrapsContext*)avctx->priv_data;
360 if (s->frame.data[0])
361 avctx->release_buffer(avctx, &s->frame);
363 av_freep(&s->tmpbuf);
368 AVCodec fraps_decoder = {
372 sizeof(FrapsContext),
378 .long_name = NULL_IF_CONFIG_SMALL("Fraps"),