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ffmpeg / libavcodec / fraps.c @ 1855abe5

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/*
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 * Fraps FPS1 decoder
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 * Copyright (c) 2005 Roine Gustafsson
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 * 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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 */
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/**
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 * @file fraps.c
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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
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 */
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#include "avcodec.h"
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#include "bitstream.h"
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#include "huffman.h"
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#include "bytestream.h"
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#include "dsputil.h"
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#define FPS_TAG MKTAG('F', 'P', 'S', 'x')
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/**
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 * local variable storage
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 */
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typedef struct FrapsContext{
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    AVCodecContext *avctx;
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    AVFrame frame;
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    uint8_t *tmpbuf;
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    DSPContext dsp;
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} FrapsContext;
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/**
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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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 */
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static int decode_init(AVCodecContext *avctx)
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{
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    FrapsContext * const s = avctx->priv_data;
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    avctx->coded_frame = (AVFrame*)&s->frame;
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    avctx->pix_fmt= PIX_FMT_NONE; /* set in decode_frame */
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    s->avctx = avctx;
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    s->frame.data[0] = NULL;
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    s->tmpbuf = NULL;
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    dsputil_init(&s->dsp, avctx);
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    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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 */
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static int huff_cmp(const void *va, const void *vb){
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    const Node *a = va, *b = vb;
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    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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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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{
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    int i, j;
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    GetBitContext gb;
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    VLC vlc;
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    Node nodes[512];
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    for(i = 0; i < 256; i++)
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        nodes[i].count = bytestream_get_le32(&src);
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    size -= 1024;
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    if (ff_huff_build_tree(s->avctx, &vlc, 256, nodes, huff_cmp, 0) < 0)
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        return -1;
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    /* we have built Huffman table and are ready to decode plane */
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    /* convert bits so they may be used by standard bitreader */
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    s->dsp.bswap_buf(s->tmpbuf, src, size >> 2);
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    init_get_bits(&gb, s->tmpbuf, size * 8);
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    for(j = 0; j < h; j++){
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        for(i = 0; i < w; i++){
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            dst[i] = get_vlc2(&gb, vlc.table, 9, 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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            if(j) dst[i] += dst[i - stride];
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            else if(Uoff) dst[i] += 0x80;
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        }
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        dst += stride;
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    }
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    free_vlc(&vlc);
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    return 0;
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}
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/**
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 * decode a frame
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 * @param avctx codec context
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 * @param data output AVFrame
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 * @param data_size size of output data or 0 if no picture is returned
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 * @param buf input data frame
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 * @param buf_size size of input data frame
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 * @return number of consumed bytes on success or negative if decode fails
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 */
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static int decode_frame(AVCodecContext *avctx,
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                        void *data, int *data_size,
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                        const uint8_t *buf, int buf_size)
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{
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    FrapsContext * const s = avctx->priv_data;
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    AVFrame *frame = data;
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    AVFrame * const f = (AVFrame*)&s->frame;
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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];
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    int i, is_chroma, planes;
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    header = AV_RL32(buf);
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    version = header & 0xff;
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    header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
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    if (version > 2 && version != 4) {
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        av_log(avctx, AV_LOG_ERROR,
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               "This file is encoded with Fraps version %d. " \
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               "This codec can only decode version 0, 1, 2 and 4.\n", version);
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        return -1;
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    }
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    buf+=4;
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    if (header_size == 8)
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        buf+=4;
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    switch(version) {
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    case 0:
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    default:
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        /* Fraps v0 is a reordered YUV420 */
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        avctx->pix_fmt = PIX_FMT_YUV420P;
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        if ( (buf_size != avctx->width*avctx->height*3/2+header_size) &&
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             (buf_size != header_size) ) {
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            av_log(avctx, AV_LOG_ERROR,
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                   "Invalid frame length %d (should be %d)\n",
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                   buf_size, avctx->width*avctx->height*3/2+header_size);
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            return -1;
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        }
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        if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) {
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            av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
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                   avctx->width, avctx->height);
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            return -1;
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        }
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        f->reference = 1;
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        f->buffer_hints = FF_BUFFER_HINTS_VALID |
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                          FF_BUFFER_HINTS_PRESERVE |
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                          FF_BUFFER_HINTS_REUSABLE;
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        if (avctx->reget_buffer(avctx, f)) {
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            av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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            return -1;
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        }
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        /* bit 31 means same as previous pic */
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        f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
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        f->key_frame = f->pict_type == FF_I_TYPE;
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        if (f->pict_type == FF_I_TYPE) {
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            buf32=(const uint32_t*)buf;
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            for(y=0; y<avctx->height/2; y++){
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                luma1=(uint32_t*)&f->data[0][ y*2*f->linesize[0] ];
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                luma2=(uint32_t*)&f->data[0][ (y*2+1)*f->linesize[0] ];
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                cr=(uint32_t*)&f->data[1][ y*f->linesize[1] ];
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                cb=(uint32_t*)&f->data[2][ y*f->linesize[2] ];
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                for(x=0; x<avctx->width; x+=8){
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                    *(luma1++) = *(buf32++);
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                    *(luma1++) = *(buf32++);
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                    *(luma2++) = *(buf32++);
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                    *(luma2++) = *(buf32++);
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                    *(cr++) = *(buf32++);
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                    *(cb++) = *(buf32++);
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                }
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            }
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        }
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        break;
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    case 1:
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        /* Fraps v1 is an upside-down BGR24 */
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        avctx->pix_fmt = PIX_FMT_BGR24;
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        if ( (buf_size != avctx->width*avctx->height*3+header_size) &&
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             (buf_size != header_size) ) {
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            av_log(avctx, AV_LOG_ERROR,
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                   "Invalid frame length %d (should be %d)\n",
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                   buf_size, avctx->width*avctx->height*3+header_size);
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            return -1;
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        }
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        f->reference = 1;
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        f->buffer_hints = FF_BUFFER_HINTS_VALID |
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                          FF_BUFFER_HINTS_PRESERVE |
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                          FF_BUFFER_HINTS_REUSABLE;
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        if (avctx->reget_buffer(avctx, f)) {
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            av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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            return -1;
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        }
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        /* bit 31 means same as previous pic */
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        f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
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        f->key_frame = f->pict_type == FF_I_TYPE;
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        if (f->pict_type == FF_I_TYPE) {
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            for(y=0; y<avctx->height; y++)
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                memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ],
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                       &buf[y*avctx->width*3],
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                       f->linesize[0]);
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        }
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        break;
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    case 2:
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    case 4:
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        /**
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         * Fraps v2 is Huffman-coded YUV420 planes
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         * Fraps v4 is virtually the same
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         */
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        avctx->pix_fmt = PIX_FMT_YUV420P;
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        planes = 3;
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        f->reference = 1;
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        f->buffer_hints = FF_BUFFER_HINTS_VALID |
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                          FF_BUFFER_HINTS_PRESERVE |
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                          FF_BUFFER_HINTS_REUSABLE;
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        if (avctx->reget_buffer(avctx, f)) {
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            av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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            return -1;
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        }
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        /* skip frame */
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        if(buf_size == 8) {
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            f->pict_type = FF_P_TYPE;
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            f->key_frame = 0;
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            break;
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        }
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        f->pict_type = FF_I_TYPE;
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        f->key_frame = 1;
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        if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
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            av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
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            return -1;
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        }
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        for(i = 0; i < planes; i++) {
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            offs[i] = AV_RL32(buf + 4 + i * 4);
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            if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
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                av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
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                return -1;
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            }
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        }
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        offs[planes] = buf_size;
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        for(i = 0; i < planes; i++){
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            is_chroma = !!i;
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            s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
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            if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma,
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                    avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma) < 0) {
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                av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
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                return -1;
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            }
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        }
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        break;
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    }
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    *frame = *f;
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    *data_size = sizeof(AVFrame);
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    return buf_size;
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}
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/**
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 * closes 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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 */
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static int decode_end(AVCodecContext *avctx)
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{
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    FrapsContext *s = (FrapsContext*)avctx->priv_data;
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    if (s->frame.data[0])
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        avctx->release_buffer(avctx, &s->frame);
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    av_freep(&s->tmpbuf);
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    return 0;
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}
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AVCodec fraps_decoder = {
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    "fraps",
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    CODEC_TYPE_VIDEO,
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    CODEC_ID_FRAPS,
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    sizeof(FrapsContext),
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    decode_init,
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    NULL,
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    decode_end,
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    decode_frame,
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    CODEC_CAP_DR1,
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};