X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Ffraps.c;h=73465de9af8cb9d4c267599eb127df2587ed0802;hb=93fa8b2bf5eb4302b2b188e7cbc44bf4909fd510;hp=1daebc6ea3dcc0211096421e12fb7b2170a05a81;hpb=b78e7197a81e193827cf2408fe25bc1f14843a72;p=ffmpeg diff --git a/libavcodec/fraps.c b/libavcodec/fraps.c index 1daebc6ea3d..73465de9af8 100644 --- a/libavcodec/fraps.c +++ b/libavcodec/fraps.c @@ -1,6 +1,7 @@ /* * Fraps FPS1 decoder * Copyright (c) 2005 Roine Gustafsson + * Copyright (c) 2006 Konstantin Shishkov * * This file is part of FFmpeg. * @@ -17,22 +18,24 @@ * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - * */ /** * @file fraps.c * Lossless Fraps 'FPS1' decoder * @author Roine Gustafsson + * @author Konstantin Shishkov * - * Only decodes version 0 and 1 files. * Codec algorithm for version 0 is taken from Transcode * - * Version 2 files, which are the most commonly found Fraps files, cannot be - * decoded yet. + * Version 2 files support by Konstantin Shishkov */ #include "avcodec.h" +#include "bitstream.h" +#include "huffman.h" +#include "bytestream.h" +#include "dsputil.h" #define FPS_TAG MKTAG('F', 'P', 'S', 'x') @@ -42,6 +45,8 @@ typedef struct FrapsContext{ AVCodecContext *avctx; AVFrame frame; + uint8_t *tmpbuf; + DSPContext dsp; } FrapsContext; @@ -55,15 +60,62 @@ static int decode_init(AVCodecContext *avctx) FrapsContext * const s = avctx->priv_data; avctx->coded_frame = (AVFrame*)&s->frame; - avctx->has_b_frames = 0; avctx->pix_fmt= PIX_FMT_NONE; /* set in decode_frame */ s->avctx = avctx; s->frame.data[0] = NULL; + s->tmpbuf = NULL; + + dsputil_init(&s->dsp, avctx); return 0; } +/** + * Comparator - our nodes should ascend by count + * but with preserved symbol order + */ +static int huff_cmp(const void *va, const void *vb){ + const Node *a = va, *b = vb; + return (a->count - b->count)*256 + a->sym - b->sym; +} + +/** + * decode Fraps v2 packed plane + */ +static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w, + int h, uint8_t *src, int size, int Uoff) +{ + int i, j; + GetBitContext gb; + VLC vlc; + Node nodes[512]; + + for(i = 0; i < 256; i++) + nodes[i].count = bytestream_get_le32(&src); + size -= 1024; + if (ff_huff_build_tree(s->avctx, &vlc, 256, nodes, huff_cmp, 0) < 0) + return -1; + /* we have built Huffman table and are ready to decode plane */ + + /* convert bits so they may be used by standard bitreader */ + s->dsp.bswap_buf(s->tmpbuf, src, size >> 2); + + init_get_bits(&gb, s->tmpbuf, size * 8); + for(j = 0; j < h; j++){ + for(i = 0; i < w; i++){ + dst[i] = get_vlc2(&gb, vlc.table, 9, 3); + /* lines are stored as deltas between previous lines + * and we need to add 0x80 to the first lines of chroma planes + */ + if(j) dst[i] += dst[i - stride]; + else if(Uoff) dst[i] += 0x80; + } + dst += stride; + } + free_vlc(&vlc); + return 0; +} /** * decode a frame @@ -86,16 +138,18 @@ static int decode_frame(AVCodecContext *avctx, unsigned int x, y; uint32_t *buf32; uint32_t *luma1,*luma2,*cb,*cr; + uint32_t offs[4]; + int i, is_chroma, planes; - header = LE_32(buf); + header = AV_RL32(buf); version = header & 0xff; header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */ - if (version > 1) { + if (version > 2 && version != 4) { av_log(avctx, AV_LOG_ERROR, "This file is encoded with Fraps version %d. " \ - "This codec can only decode version 0 and 1.\n", version); + "This codec can only decode version 0, 1, 2 and 4.\n", version); return -1; } @@ -187,30 +241,50 @@ static int decode_frame(AVCodecContext *avctx, break; case 2: + case 4: /** - * Fraps v2 sub-header description. All numbers are little-endian: - * (this is all guesswork) - * - * 0: DWORD 'FPSx' - * 4: DWORD 0x00000010 unknown, perhaps flags - * 8: DWORD off_2 offset to plane 2 - * 12: DWORD off_3 offset to plane 3 - * 16: 256xDWORD freqtbl_1 frequency table for plane 1 - * 1040: plane_1 - * ... - * off_2: 256xDWORD freqtbl_2 frequency table for plane 2 - * plane_2 - * ... - * off_3: 256xDWORD freqtbl_3 frequency table for plane 3 - * plane_3 + * Fraps v2 is Huffman-coded YUV420 planes + * Fraps v4 is virtually the same */ - if ((BE_32(buf) != FPS_TAG)||(buf_size < (3*1024 + 8))) { + avctx->pix_fmt = PIX_FMT_YUV420P; + planes = 3; + f->reference = 1; + f->buffer_hints = FF_BUFFER_HINTS_VALID | + FF_BUFFER_HINTS_PRESERVE | + FF_BUFFER_HINTS_REUSABLE; + if (avctx->reget_buffer(avctx, f)) { + av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); + return -1; + } + /* skip frame */ + if(buf_size == 8) { + f->pict_type = FF_P_TYPE; + f->key_frame = 0; + break; + } + f->pict_type = FF_I_TYPE; + f->key_frame = 1; + if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) { av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n"); return -1; } - - /* NOT FINISHED */ - + for(i = 0; i < planes; i++) { + offs[i] = AV_RL32(buf + 4 + i * 4); + if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) { + av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i); + return -1; + } + } + offs[planes] = buf_size; + for(i = 0; i < planes; i++){ + is_chroma = !!i; + s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE); + if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma, + avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma) < 0) { + av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i); + return -1; + } + } break; } @@ -233,6 +307,7 @@ static int decode_end(AVCodecContext *avctx) if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); + av_freep(&s->tmpbuf); return 0; }