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
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"
42 #define FPS_TAG MKTAG('F', 'P', 'S', 'x')
45 * local variable storage
47 typedef struct FrapsContext {
48 AVCodecContext *avctx;
57 * @param avctx codec context
58 * @return 0 on success or negative if fails
60 static av_cold int decode_init(AVCodecContext *avctx)
62 FrapsContext * const s = avctx->priv_data;
67 ff_dsputil_init(&s->dsp, avctx);
73 * Comparator - our nodes should ascend by count
74 * but with preserved symbol order
76 static int huff_cmp(const void *va, const void *vb)
78 const Node *a = va, *b = vb;
79 return (a->count - b->count)*256 + a->sym - b->sym;
83 * decode Fraps v2 packed plane
85 static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
86 int h, const uint8_t *src, int size, int Uoff,
94 for (i = 0; i < 256; i++)
95 nodes[i].count = bytestream_get_le32(&src);
97 if ((ret = ff_huff_build_tree(s->avctx, &vlc, 256, FF_HUFFMAN_BITS,
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, FF_HUFFMAN_BITS, 3);
110 /* lines are stored as deltas between previous lines
111 * and we need to add 0x80 to the first lines of chroma planes
114 dst[i] += dst[i - stride];
117 if (get_bits_left(&gb) < 0) {
119 return AVERROR_INVALIDDATA;
128 static int decode_frame(AVCodecContext *avctx,
129 void *data, int *got_frame,
132 FrapsContext * const s = avctx->priv_data;
133 const uint8_t *buf = avpkt->data;
134 int buf_size = avpkt->size;
135 ThreadFrame frame = { .f = data };
136 AVFrame * const f = data;
138 unsigned int version,header_size;
140 const uint32_t *buf32;
141 uint32_t *luma1,*luma2,*cb,*cr;
143 int i, j, ret, is_chroma;
144 const int planes = 3;
148 av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
149 return AVERROR_INVALIDDATA;
152 header = AV_RL32(buf);
153 version = header & 0xff;
154 header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
157 av_log(avctx, AV_LOG_ERROR,
158 "This file is encoded with Fraps version %d. " \
159 "This codec can only decode versions <= 5.\n", version);
160 return AVERROR_PATCHWELCOME;
166 unsigned needed_size = avctx->width * avctx->height * 3;
167 if (version == 0) needed_size /= 2;
168 needed_size += header_size;
169 /* bit 31 means same as previous pic */
170 if (header & (1U<<31)) {
174 if (buf_size != needed_size) {
175 av_log(avctx, AV_LOG_ERROR,
176 "Invalid frame length %d (should be %d)\n",
177 buf_size, needed_size);
178 return AVERROR_INVALIDDATA;
186 if (AV_RL32(buf) != FPS_TAG || buf_size < planes*1024 + 24) {
187 av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
188 return AVERROR_INVALIDDATA;
190 for (i = 0; i < planes; i++) {
191 offs[i] = AV_RL32(buf + 4 + i * 4);
192 if (offs[i] >= buf_size - header_size || (i && offs[i] <= offs[i - 1] + 1024)) {
193 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
194 return AVERROR_INVALIDDATA;
197 offs[planes] = buf_size - header_size;
198 for (i = 0; i < planes; i++) {
199 av_fast_padded_malloc(&s->tmpbuf, &s->tmpbuf_size, offs[i + 1] - offs[i] - 1024);
201 return AVERROR(ENOMEM);
205 f->pict_type = AV_PICTURE_TYPE_I;
208 avctx->pix_fmt = version & 1 ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
209 avctx->color_range = version & 1 ? AVCOL_RANGE_UNSPECIFIED : AVCOL_RANGE_JPEG;
210 avctx->colorspace = version & 1 ? AVCOL_SPC_UNSPECIFIED : AVCOL_SPC_BT709;
212 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
218 /* Fraps v0 is a reordered YUV420 */
219 if (((avctx->width % 8) != 0) || ((avctx->height % 2) != 0)) {
220 av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
221 avctx->width, avctx->height);
222 return AVERROR_INVALIDDATA;
225 buf32 = (const uint32_t*)buf;
226 for (y = 0; y < avctx->height / 2; y++) {
227 luma1 = (uint32_t*)&f->data[0][ y * 2 * f->linesize[0] ];
228 luma2 = (uint32_t*)&f->data[0][ (y * 2 + 1) * f->linesize[0] ];
229 cr = (uint32_t*)&f->data[1][ y * f->linesize[1] ];
230 cb = (uint32_t*)&f->data[2][ y * f->linesize[2] ];
231 for (x = 0; x < avctx->width; x += 8) {
243 /* Fraps v1 is an upside-down BGR24 */
244 for (y = 0; y<avctx->height; y++)
245 memcpy(&f->data[0][(avctx->height - y - 1) * f->linesize[0]],
246 &buf[y * avctx->width * 3],
253 * Fraps v2 is Huffman-coded YUV420 planes
254 * Fraps v4 is virtually the same
256 for (i = 0; i < planes; i++) {
258 if ((ret = fraps2_decode_plane(s, f->data[i], f->linesize[i],
259 avctx->width >> is_chroma,
260 avctx->height >> is_chroma,
261 buf + offs[i], offs[i + 1] - offs[i],
262 is_chroma, 1)) < 0) {
263 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
270 /* Virtually the same as version 4, but is for RGB24 */
271 for (i = 0; i < planes; i++) {
272 if ((ret = fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)),
273 -f->linesize[0], avctx->width, avctx->height,
274 buf + offs[i], offs[i + 1] - offs[i], 0, 3)) < 0) {
275 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
280 // convert pseudo-YUV into real RGB
281 for (j = 0; j < avctx->height; j++) {
282 uint8_t *line_end = out + 3*avctx->width;
283 while (out < line_end) {
288 out += f->linesize[0] - 3*avctx->width;
301 * @param avctx codec context
302 * @return 0 on success or negative if fails
304 static av_cold int decode_end(AVCodecContext *avctx)
306 FrapsContext *s = (FrapsContext*)avctx->priv_data;
308 av_freep(&s->tmpbuf);
313 AVCodec ff_fraps_decoder = {
315 .type = AVMEDIA_TYPE_VIDEO,
316 .id = AV_CODEC_ID_FRAPS,
317 .priv_data_size = sizeof(FrapsContext),
320 .decode = decode_frame,
321 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
322 .long_name = NULL_IF_CONFIG_SMALL("Fraps"),