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')
46 * local variable storage
48 typedef struct FrapsContext {
49 AVCodecContext *avctx;
58 * @param avctx codec context
59 * @return 0 on success or negative if fails
61 static av_cold int decode_init(AVCodecContext *avctx)
63 FrapsContext * const s = avctx->priv_data;
68 ff_bswapdsp_init(&s->bdsp);
74 * Comparator - our nodes should ascend by count
75 * but with preserved symbol order
77 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 ((ret = ff_huff_build_tree(s->avctx, &vlc, 256, VLC_BITS,
100 FF_HUFFMAN_FLAG_ZERO_COUNT)) < 0)
102 /* we have built Huffman table and are ready to decode plane */
104 /* convert bits so they may be used by standard bitreader */
105 s->bdsp.bswap_buf((uint32_t *) s->tmpbuf,
106 (const uint32_t *) src, size >> 2);
108 init_get_bits(&gb, s->tmpbuf, size * 8);
109 for (j = 0; j < h; j++) {
110 for (i = 0; i < w*step; i += step) {
111 dst[i] = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
112 /* lines are stored as deltas between previous lines
113 * and we need to add 0x80 to the first lines of chroma planes
116 dst[i] += dst[i - stride];
119 if (get_bits_left(&gb) < 0) {
121 return AVERROR_INVALIDDATA;
130 static int decode_frame(AVCodecContext *avctx,
131 void *data, int *got_frame,
134 FrapsContext * const s = avctx->priv_data;
135 const uint8_t *buf = avpkt->data;
136 int buf_size = avpkt->size;
137 ThreadFrame frame = { .f = data };
138 AVFrame * const f = data;
140 unsigned int version,header_size;
142 const uint32_t *buf32;
143 uint32_t *luma1,*luma2,*cb,*cr;
145 int i, j, ret, is_chroma;
146 const int planes = 3;
150 av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
151 return AVERROR_INVALIDDATA;
154 header = AV_RL32(buf);
155 version = header & 0xff;
156 header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
159 av_log(avctx, AV_LOG_ERROR,
160 "This file is encoded with Fraps version %d. " \
161 "This codec can only decode versions <= 5.\n", version);
162 return AVERROR_PATCHWELCOME;
168 unsigned needed_size = avctx->width * avctx->height * 3;
169 if (version == 0) needed_size /= 2;
170 needed_size += header_size;
171 /* bit 31 means same as previous pic */
172 if (header & (1U<<31)) {
176 if (buf_size != needed_size) {
177 av_log(avctx, AV_LOG_ERROR,
178 "Invalid frame length %d (should be %d)\n",
179 buf_size, needed_size);
180 return AVERROR_INVALIDDATA;
188 if (AV_RL32(buf) != FPS_TAG || buf_size < planes*1024 + 24) {
189 av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
190 return AVERROR_INVALIDDATA;
192 for (i = 0; i < planes; i++) {
193 offs[i] = AV_RL32(buf + 4 + i * 4);
194 if (offs[i] >= buf_size - header_size || (i && offs[i] <= offs[i - 1] + 1024)) {
195 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
196 return AVERROR_INVALIDDATA;
199 offs[planes] = buf_size - header_size;
200 for (i = 0; i < planes; i++) {
201 av_fast_padded_malloc(&s->tmpbuf, &s->tmpbuf_size, offs[i + 1] - offs[i] - 1024);
203 return AVERROR(ENOMEM);
207 f->pict_type = AV_PICTURE_TYPE_I;
210 avctx->pix_fmt = version & 1 ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
211 avctx->color_range = version & 1 ? AVCOL_RANGE_UNSPECIFIED
213 avctx->colorspace = version & 1 ? AVCOL_SPC_UNSPECIFIED : AVCOL_SPC_BT709;
215 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
221 /* Fraps v0 is a reordered YUV420 */
222 if (((avctx->width % 8) != 0) || ((avctx->height % 2) != 0)) {
223 av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
224 avctx->width, avctx->height);
225 return AVERROR_INVALIDDATA;
228 buf32 = (const uint32_t*)buf;
229 for (y = 0; y < avctx->height / 2; y++) {
230 luma1 = (uint32_t*)&f->data[0][ y * 2 * f->linesize[0] ];
231 luma2 = (uint32_t*)&f->data[0][ (y * 2 + 1) * f->linesize[0] ];
232 cr = (uint32_t*)&f->data[1][ y * f->linesize[1] ];
233 cb = (uint32_t*)&f->data[2][ y * f->linesize[2] ];
234 for (x = 0; x < avctx->width; x += 8) {
246 /* Fraps v1 is an upside-down BGR24 */
247 for (y = 0; y<avctx->height; y++)
248 memcpy(&f->data[0][(avctx->height - y - 1) * f->linesize[0]],
249 &buf[y * avctx->width * 3],
256 * Fraps v2 is Huffman-coded YUV420 planes
257 * Fraps v4 is virtually the same
259 for (i = 0; i < planes; i++) {
261 if ((ret = fraps2_decode_plane(s, f->data[i], f->linesize[i],
262 avctx->width >> is_chroma,
263 avctx->height >> is_chroma,
264 buf + offs[i], offs[i + 1] - offs[i],
265 is_chroma, 1)) < 0) {
266 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
273 /* Virtually the same as version 4, but is for RGB24 */
274 for (i = 0; i < planes; i++) {
275 if ((ret = fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)),
276 -f->linesize[0], avctx->width, avctx->height,
277 buf + offs[i], offs[i + 1] - offs[i], 0, 3)) < 0) {
278 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
283 // convert pseudo-YUV into real RGB
284 for (j = 0; j < avctx->height; j++) {
285 uint8_t *line_end = out + 3*avctx->width;
286 while (out < line_end) {
291 out += f->linesize[0] - 3*avctx->width;
304 * @param avctx codec context
305 * @return 0 on success or negative if fails
307 static av_cold int decode_end(AVCodecContext *avctx)
309 FrapsContext *s = (FrapsContext*)avctx->priv_data;
311 av_freep(&s->tmpbuf);
316 AVCodec ff_fraps_decoder = {
318 .long_name = NULL_IF_CONFIG_SMALL("Fraps"),
319 .type = AVMEDIA_TYPE_VIDEO,
320 .id = AV_CODEC_ID_FRAPS,
321 .priv_data_size = sizeof(FrapsContext),
324 .decode = decode_frame,
325 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,