LCOV - code coverage report
Current view: top level - libavcodec - fraps.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 126 155 81.3 %
Date: 2017-12-16 13:57:32 Functions: 5 5 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Fraps FPS1 decoder
       3             :  * Copyright (c) 2005 Roine Gustafsson
       4             :  * Copyright (c) 2006 Konstantin Shishkov
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       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.
      12             :  *
      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.
      17             :  *
      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
      21             :  */
      22             : 
      23             : /**
      24             :  * @file
      25             :  * Lossless Fraps 'FPS1' decoder
      26             :  * @author Roine Gustafsson (roine at users sf net)
      27             :  * @author Konstantin Shishkov
      28             :  *
      29             :  * Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
      30             :  *
      31             :  * Version 2 files support by Konstantin Shishkov
      32             :  */
      33             : 
      34             : #include "avcodec.h"
      35             : #include "get_bits.h"
      36             : #include "huffman.h"
      37             : #include "bytestream.h"
      38             : #include "bswapdsp.h"
      39             : #include "internal.h"
      40             : #include "thread.h"
      41             : 
      42             : #define FPS_TAG MKTAG('F', 'P', 'S', 'x')
      43             : #define VLC_BITS 11
      44             : 
      45             : /**
      46             :  * local variable storage
      47             :  */
      48             : typedef struct FrapsContext {
      49             :     AVCodecContext *avctx;
      50             :     BswapDSPContext bdsp;
      51             :     uint8_t *tmpbuf;
      52             :     int tmpbuf_size;
      53             : } FrapsContext;
      54             : 
      55             : 
      56             : /**
      57             :  * initializes decoder
      58             :  * @param avctx codec context
      59             :  * @return 0 on success or negative if fails
      60             :  */
      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;
      67             : 
      68          14 :     ff_bswapdsp_init(&s->bdsp);
      69             : 
      70          14 :     return 0;
      71             : }
      72             : 
      73             : /**
      74             :  * Comparator - our nodes should ascend by count
      75             :  * but with preserved symbol order
      76             :  */
      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;
      81             : }
      82             : 
      83             : /**
      84             :  * decode Fraps v2 packed plane
      85             :  */
      86         417 : 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,
      88             :                                const int step)
      89             : {
      90             :     int i, j, ret;
      91             :     GetBitContext gb;
      92             :     VLC vlc;
      93             :     Node nodes[512];
      94             : 
      95      107169 :     for (i = 0; i < 256; i++)
      96      106752 :         nodes[i].count = bytestream_get_le32(&src);
      97         417 :     size -= 1024;
      98         417 :     if ((ret = ff_huff_build_tree(s->avctx, &vlc, 256, VLC_BITS,
      99             :                                   nodes, huff_cmp,
     100             :                                   FF_HUFFMAN_FLAG_ZERO_COUNT)) < 0)
     101           0 :         return ret;
     102             :     /* we have built Huffman table and are ready to decode plane */
     103             : 
     104             :     /* convert bits so they may be used by standard bitreader */
     105         417 :     s->bdsp.bswap_buf((uint32_t *) s->tmpbuf,
     106             :                       (const uint32_t *) src, size >> 2);
     107             : 
     108         417 :     if ((ret = init_get_bits8(&gb, s->tmpbuf, size)) < 0)
     109           0 :         return ret;
     110             : 
     111       82607 :     for (j = 0; j < h; j++) {
     112    29602124 :         for (i = 0; i < w*step; i += step) {
     113    29519934 :             dst[i] = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
     114             :             /* lines are stored as deltas between previous lines
     115             :              * and we need to add 0x80 to the first lines of chroma planes
     116             :              */
     117    29519934 :             if (j)
     118    29387582 :                 dst[i] += dst[i - stride];
     119      132352 :             else if (Uoff)
     120        8192 :                 dst[i] += 0x80;
     121    29519934 :             if (get_bits_left(&gb) < 0) {
     122           2 :                 ff_free_vlc(&vlc);
     123           2 :                 return AVERROR_INVALIDDATA;
     124             :             }
     125             :         }
     126       82190 :         dst += stride;
     127             :     }
     128         415 :     ff_free_vlc(&vlc);
     129         415 :     return 0;
     130             : }
     131             : 
     132         176 : static int decode_frame(AVCodecContext *avctx,
     133             :                         void *data, int *got_frame,
     134             :                         AVPacket *avpkt)
     135             : {
     136         176 :     FrapsContext * const s = avctx->priv_data;
     137         176 :     const uint8_t *buf     = avpkt->data;
     138         176 :     int buf_size           = avpkt->size;
     139         176 :     ThreadFrame frame = { .f = data };
     140         176 :     AVFrame * const f = data;
     141             :     uint32_t header;
     142             :     unsigned int version,header_size;
     143             :     unsigned int x, y;
     144             :     const uint32_t *buf32;
     145             :     uint32_t *luma1,*luma2,*cb,*cr;
     146             :     uint32_t offs[4];
     147             :     int i, j, ret, is_chroma;
     148         176 :     const int planes = 3;
     149             :     int is_pal;
     150             :     uint8_t *out;
     151             : 
     152         176 :     if (buf_size < 4) {
     153           0 :         av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
     154           0 :         return AVERROR_INVALIDDATA;
     155             :     }
     156             : 
     157         176 :     header      = AV_RL32(buf);
     158         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 */
     161             : 
     162         176 :     if (version > 5) {
     163           0 :         avpriv_report_missing_feature(avctx, "Fraps version %u", version);
     164           0 :         return AVERROR_PATCHWELCOME;
     165             :     }
     166             : 
     167         176 :     buf += header_size;
     168             : 
     169         176 :     if (is_pal) {
     170           0 :         unsigned needed_size = avctx->width * avctx->height + 1024;
     171           0 :         needed_size += header_size;
     172           0 :         if (buf_size != needed_size) {
     173           0 :             av_log(avctx, AV_LOG_ERROR,
     174             :                    "Invalid frame length %d (should be %d)\n",
     175             :                    buf_size, needed_size);
     176           0 :             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           0 :             *got_frame = 0;
     185           0 :             return buf_size;
     186             :         }
     187          24 :         if (buf_size != needed_size) {
     188           1 :             av_log(avctx, AV_LOG_ERROR,
     189             :                    "Invalid frame length %d (should be %d)\n",
     190             :                    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           0 :             av_log(avctx, AV_LOG_ERROR, "error in data stream\n");
     201           0 :             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           0 :                 return AVERROR(ENOMEM);
     215             :         }
     216             :     }
     217             : 
     218         162 :     f->pict_type = AV_PICTURE_TYPE_I;
     219         162 :     f->key_frame = 1;
     220             : 
     221         162 :     avctx->pix_fmt = version & 1 ? is_pal ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
     222         324 :     avctx->color_range = version & 1 ? AVCOL_RANGE_UNSPECIFIED
     223         162 :                                      : AVCOL_RANGE_JPEG;
     224         162 :     avctx->colorspace = version & 1 ? AVCOL_SPC_UNSPECIFIED : AVCOL_SPC_BT709;
     225             : 
     226         162 :     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
     227           0 :         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           0 :             av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
     235             :                    avctx->width, avctx->height);
     236           0 :             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] ];
     243        2268 :             cr    = (uint32_t*)&f->data[1][  y          * f->linesize[1] ];
     244        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           0 :             uint32_t *pal = (uint32_t *)f->data[1];
     259             : 
     260           0 :             for (y = 0; y < 256; y++) {
     261           0 :                 pal[y] = AV_RL32(buf) | 0xFF000000;
     262           0 :                 buf += 4;
     263             :             }
     264             : 
     265           0 :             for (y = 0; y <avctx->height; y++)
     266           0 :                 memcpy(&f->data[0][y * f->linesize[0]],
     267           0 :                        &buf[y * avctx->width],
     268           0 :                        avctx->width);
     269             :         } else {
     270             :         /* Fraps v1 is an upside-down BGR24 */
     271         482 :             for (y = 0; y<avctx->height; y++)
     272         960 :                 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         132 :             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          66 :                                            buf + offs[i], offs[i + 1] - offs[i],
     290             :                                            is_chroma, 1)) < 0) {
     291           0 :                 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
     292           0 :                 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        1152 :             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         768 :                                            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     7327968 :             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             : };

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