GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/fraps.c Lines: 126 155 81.3 %
Date: 2019-11-22 03:34:36 Branches: 72 98 73.5 %

Line Branch Exec Source
1
/*
2
 * Fraps FPS1 decoder
3
 * Copyright (c) 2005 Roine Gustafsson
4
 * Copyright (c) 2006 Konstantin Shishkov
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 *
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 * This file is part of FFmpeg.
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 *
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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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 *
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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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 *
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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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 */
22
23
/**
24
 * @file
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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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 *
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 * Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
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 *
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 * Version 2 files support by Konstantin Shishkov
32
 */
33
34
#include "avcodec.h"
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#include "get_bits.h"
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#include "huffman.h"
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#include "bytestream.h"
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#include "bswapdsp.h"
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#include "internal.h"
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#include "thread.h"
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42
#define FPS_TAG MKTAG('F', 'P', 'S', 'x')
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#define VLC_BITS 11
44
45
/**
46
 * local variable storage
47
 */
48
typedef struct FrapsContext {
49
    AVCodecContext *avctx;
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    BswapDSPContext bdsp;
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    uint8_t *tmpbuf;
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    int tmpbuf_size;
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} FrapsContext;
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55
56
/**
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 * initializes decoder
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 * @param avctx codec context
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 * @return 0 on success or negative if fails
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 */
61
14
static av_cold int decode_init(AVCodecContext *avctx)
62
{
63
14
    FrapsContext * const s = avctx->priv_data;
64
65
14
    s->avctx  = avctx;
66
14
    s->tmpbuf = NULL;
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68
14
    ff_bswapdsp_init(&s->bdsp);
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70
14
    return 0;
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}
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/**
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 * Comparator - our nodes should ascend by count
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 * but with preserved symbol order
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 */
77
924225
static int huff_cmp(const void *va, const void *vb)
78
{
79
924225
    const Node *a = va, *b = vb;
80
924225
    return (a->count - b->count)*256 + a->sym - b->sym;
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}
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/**
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 * decode Fraps v2 packed plane
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 */
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417
static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
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                               int h, const uint8_t *src, int size, int Uoff,
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                               const int step)
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{
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    int i, j, ret;
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    GetBitContext gb;
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    VLC vlc;
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    Node nodes[512];
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95
107169
    for (i = 0; i < 256; i++)
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106752
        nodes[i].count = bytestream_get_le32(&src);
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417
    size -= 1024;
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417
    if ((ret = ff_huff_build_tree(s->avctx, &vlc, 256, VLC_BITS,
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                                  nodes, huff_cmp,
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                                  FF_HUFFMAN_FLAG_ZERO_COUNT)) < 0)
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        return ret;
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    /* we have built Huffman table and are ready to decode plane */
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104
    /* convert bits so they may be used by standard bitreader */
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417
    s->bdsp.bswap_buf((uint32_t *) s->tmpbuf,
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                      (const uint32_t *) src, size >> 2);
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108
417
    if ((ret = init_get_bits8(&gb, s->tmpbuf, size)) < 0)
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        return ret;
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111
82607
    for (j = 0; j < h; j++) {
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29602124
        for (i = 0; i < w*step; i += step) {
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29519934
            dst[i] = get_vlc2(&gb, vlc.table, VLC_BITS, 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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             */
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29519934
            if (j)
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29387582
                dst[i] += dst[i - stride];
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132352
            else if (Uoff)
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8192
                dst[i] += 0x80;
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29519934
            if (get_bits_left(&gb) < 0) {
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2
                ff_free_vlc(&vlc);
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2
                return AVERROR_INVALIDDATA;
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            }
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        }
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82190
        dst += stride;
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    }
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415
    ff_free_vlc(&vlc);
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415
    return 0;
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}
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132
176
static int decode_frame(AVCodecContext *avctx,
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                        void *data, int *got_frame,
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                        AVPacket *avpkt)
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{
136
176
    FrapsContext * const s = avctx->priv_data;
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176
    const uint8_t *buf     = avpkt->data;
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176
    int buf_size           = avpkt->size;
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176
    ThreadFrame frame = { .f = data };
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176
    AVFrame * const f = data;
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    uint32_t header;
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    unsigned int version,header_size;
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    unsigned int x, y;
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    const uint32_t *buf32;
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    uint32_t *luma1,*luma2,*cb,*cr;
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    uint32_t offs[4];
147
    int i, j, ret, is_chroma;
148
176
    const int planes = 3;
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    int is_pal;
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    uint8_t *out;
151
152
176
    if (buf_size < 4) {
153
        av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
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        return AVERROR_INVALIDDATA;
155
    }
156
157
176
    header      = AV_RL32(buf);
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176
    version     = header & 0xff;
159

176
    is_pal      = buf[1] == 2 && version == 1;
160
176
    header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
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162
176
    if (version > 5) {
163
        avpriv_report_missing_feature(avctx, "Fraps version %u", version);
164
        return AVERROR_PATCHWELCOME;
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    }
166
167
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    buf += header_size;
168
169
176
    if (is_pal) {
170
        unsigned needed_size = avctx->width * avctx->height + 1024;
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        needed_size += header_size;
172
        if (buf_size != needed_size) {
173
            av_log(avctx, AV_LOG_ERROR,
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                   "Invalid frame length %d (should be %d)\n",
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                   buf_size, needed_size);
176
            return AVERROR_INVALIDDATA;
177
        }
178
176
    } else if (version < 2) {
179
24
        unsigned needed_size = avctx->width * avctx->height * 3;
180
24
        if (version == 0) needed_size /= 2;
181
24
        needed_size += header_size;
182
        /* bit 31 means same as previous pic */
183
24
        if (header & (1U<<31)) {
184
            *got_frame = 0;
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            return buf_size;
186
        }
187
24
        if (buf_size != needed_size) {
188
1
            av_log(avctx, AV_LOG_ERROR,
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                   "Invalid frame length %d (should be %d)\n",
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                   buf_size, needed_size);
191
1
            return AVERROR_INVALIDDATA;
192
        }
193
    } else {
194
        /* skip frame */
195
152
        if (buf_size == 8) {
196
10
            *got_frame = 0;
197
10
            return buf_size;
198
        }
199

142
        if (AV_RL32(buf) != FPS_TAG || buf_size < planes*1024 + 24) {
200
            av_log(avctx, AV_LOG_ERROR, "error in data stream\n");
201
            return AVERROR_INVALIDDATA;
202
        }
203
563
        for (i = 0; i < planes; i++) {
204
424
            offs[i] = AV_RL32(buf + 4 + i * 4);
205

424
            if (offs[i] >= buf_size - header_size || (i && offs[i] <= offs[i - 1] + 1024)) {
206
3
                av_log(avctx, AV_LOG_ERROR, "plane %i offset is out of bounds\n", i);
207
3
                return AVERROR_INVALIDDATA;
208
            }
209
        }
210
139
        offs[planes] = buf_size - header_size;
211
556
        for (i = 0; i < planes; i++) {
212
417
            av_fast_padded_malloc(&s->tmpbuf, &s->tmpbuf_size, offs[i + 1] - offs[i] - 1024);
213
417
            if (!s->tmpbuf)
214
                return AVERROR(ENOMEM);
215
        }
216
    }
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218
162
    f->pict_type = AV_PICTURE_TYPE_I;
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162
    f->key_frame = 1;
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221

162
    avctx->pix_fmt = version & 1 ? is_pal ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
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    avctx->color_range = version & 1 ? AVCOL_RANGE_UNSPECIFIED
223
162
                                     : AVCOL_RANGE_JPEG;
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    avctx->colorspace = version & 1 ? AVCOL_SPC_UNSPECIFIED : AVCOL_SPC_BT709;
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226
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    if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
227
        return ret;
228
229

162
    switch (version) {
230
21
    case 0:
231
    default:
232
        /* Fraps v0 is a reordered YUV420 */
233

21
        if (((avctx->width % 8) != 0) || ((avctx->height % 2) != 0)) {
234
            av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
235
                   avctx->width, avctx->height);
236
            return AVERROR_INVALIDDATA;
237
        }
238
239
21
        buf32 = (const uint32_t*)buf;
240
2289
        for (y = 0; y < avctx->height / 2; y++) {
241
2268
            luma1 = (uint32_t*)&f->data[0][  y * 2      * f->linesize[0] ];
242
2268
            luma2 = (uint32_t*)&f->data[0][ (y * 2 + 1) * f->linesize[0] ];
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2268
            cr    = (uint32_t*)&f->data[1][  y          * f->linesize[1] ];
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2268
            cb    = (uint32_t*)&f->data[2][  y          * f->linesize[2] ];
245
90720
            for (x = 0; x < avctx->width; x += 8) {
246
88452
                *luma1++ = *buf32++;
247
88452
                *luma1++ = *buf32++;
248
88452
                *luma2++ = *buf32++;
249
88452
                *luma2++ = *buf32++;
250
88452
                *cr++    = *buf32++;
251
88452
                *cb++    = *buf32++;
252
            }
253
        }
254
21
        break;
255
256
2
    case 1:
257
2
        if (is_pal) {
258
            uint32_t *pal = (uint32_t *)f->data[1];
259
260
            for (y = 0; y < 256; y++) {
261
                pal[y] = AV_RL32(buf) | 0xFF000000;
262
                buf += 4;
263
            }
264
265
            for (y = 0; y <avctx->height; y++)
266
                memcpy(&f->data[0][y * f->linesize[0]],
267
                       &buf[y * avctx->width],
268
                       avctx->width);
269
        } else {
270
        /* Fraps v1 is an upside-down BGR24 */
271
482
            for (y = 0; y<avctx->height; y++)
272
480
                memcpy(&f->data[0][(avctx->height - y - 1) * f->linesize[0]],
273
480
                       &buf[y * avctx->width * 3],
274
480
                       3 * avctx->width);
275
        }
276
2
        break;
277
278
11
    case 2:
279
    case 4:
280
        /**
281
         * Fraps v2 is Huffman-coded YUV420 planes
282
         * Fraps v4 is virtually the same
283
         */
284
44
        for (i = 0; i < planes; i++) {
285
33
            is_chroma = !!i;
286
33
            if ((ret = fraps2_decode_plane(s, f->data[i], f->linesize[i],
287
33
                                           avctx->width  >> is_chroma,
288
33
                                           avctx->height >> is_chroma,
289
33
                                           buf + offs[i], offs[i + 1] - offs[i],
290
                                           is_chroma, 1)) < 0) {
291
                av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
292
                return ret;
293
            }
294
        }
295
11
        break;
296
128
    case 3:
297
    case 5:
298
        /* Virtually the same as version 4, but is for RGB24 */
299
510
        for (i = 0; i < planes; i++) {
300
384
            if ((ret = fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)),
301
384
                                           -f->linesize[0], avctx->width, avctx->height,
302
384
                                           buf + offs[i], offs[i + 1] - offs[i], 0, 3)) < 0) {
303
2
                av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
304
2
                return ret;
305
            }
306
        }
307
126
        out = f->data[0];
308
        // convert pseudo-YUV into real RGB
309
23022
        for (j = 0; j < avctx->height; j++) {
310
22896
            uint8_t *line_end = out + 3*avctx->width;
311
7305072
            while (out < line_end) {
312
7282176
                out[0]  += out[1];
313
7282176
                out[2]  += out[1];
314
7282176
                out += 3;
315
            }
316
22896
            out += f->linesize[0] - 3*avctx->width;
317
        }
318
126
        break;
319
    }
320
321
160
    *got_frame = 1;
322
323
160
    return buf_size;
324
}
325
326
327
/**
328
 * closes decoder
329
 * @param avctx codec context
330
 * @return 0 on success or negative if fails
331
 */
332
14
static av_cold int decode_end(AVCodecContext *avctx)
333
{
334
14
    FrapsContext *s = (FrapsContext*)avctx->priv_data;
335
336
14
    av_freep(&s->tmpbuf);
337
14
    return 0;
338
}
339
340
341
AVCodec ff_fraps_decoder = {
342
    .name           = "fraps",
343
    .long_name      = NULL_IF_CONFIG_SMALL("Fraps"),
344
    .type           = AVMEDIA_TYPE_VIDEO,
345
    .id             = AV_CODEC_ID_FRAPS,
346
    .priv_data_size = sizeof(FrapsContext),
347
    .init           = decode_init,
348
    .close          = decode_end,
349
    .decode         = decode_frame,
350
    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
351
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
352
};