/* * Fraps FPS1 decoder * Copyright (c) 2005 Roine Gustafsson * Copyright (c) 2006 Konstantin Shishkov * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * 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 <roine at users sf net> * @author Konstantin Shishkov * * Codec algorithm for version 0 is taken from Transcode <www.transcoding.org> * * 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') /** * local variable storage */ typedef struct FrapsContext{ AVCodecContext *avctx; AVFrame frame; uint8_t *tmpbuf; DSPContext dsp; } FrapsContext; /** * initializes decoder * @param avctx codec context * @return 0 on success or negative if fails */ static int decode_init(AVCodecContext *avctx) { FrapsContext * const s = avctx->priv_data; avctx->coded_frame = (AVFrame*)&s->frame; 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 * @param avctx codec context * @param data output AVFrame * @param data_size size of output data or 0 if no picture is returned * @param buf input data frame * @param buf_size size of input data frame * @return number of consumed bytes on success or negative if decode fails */ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { FrapsContext * const s = avctx->priv_data; AVFrame *frame = data; AVFrame * const f = (AVFrame*)&s->frame; uint32_t header; unsigned int version,header_size; unsigned int x, y; uint32_t *buf32; uint32_t *luma1,*luma2,*cb,*cr; uint32_t offs[4]; int i, is_chroma, planes; header = AV_RL32(buf); version = header & 0xff; header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */ 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, 1, 2 and 4.\n", version); return -1; } buf+=4; if (header_size == 8) buf+=4; switch(version) { case 0: default: /* Fraps v0 is a reordered YUV420 */ avctx->pix_fmt = PIX_FMT_YUV420P; if ( (buf_size != avctx->width*avctx->height*3/2+header_size) && (buf_size != header_size) ) { av_log(avctx, AV_LOG_ERROR, "Invalid frame length %d (should be %d)\n", buf_size, avctx->width*avctx->height*3/2+header_size); return -1; } if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) { av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n", avctx->width, avctx->height); return -1; } 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; } /* bit 31 means same as previous pic */ f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE; f->key_frame = f->pict_type == FF_I_TYPE; if (f->pict_type == FF_I_TYPE) { buf32=(uint32_t*)buf; for(y=0; y<avctx->height/2; y++){ luma1=(uint32_t*)&f->data[0][ y*2*f->linesize[0] ]; luma2=(uint32_t*)&f->data[0][ (y*2+1)*f->linesize[0] ]; cr=(uint32_t*)&f->data[1][ y*f->linesize[1] ]; cb=(uint32_t*)&f->data[2][ y*f->linesize[2] ]; for(x=0; x<avctx->width; x+=8){ *(luma1++) = *(buf32++); *(luma1++) = *(buf32++); *(luma2++) = *(buf32++); *(luma2++) = *(buf32++); *(cr++) = *(buf32++); *(cb++) = *(buf32++); } } } break; case 1: /* Fraps v1 is an upside-down BGR24 */ avctx->pix_fmt = PIX_FMT_BGR24; if ( (buf_size != avctx->width*avctx->height*3+header_size) && (buf_size != header_size) ) { av_log(avctx, AV_LOG_ERROR, "Invalid frame length %d (should be %d)\n", buf_size, avctx->width*avctx->height*3+header_size); return -1; } 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; } /* bit 31 means same as previous pic */ f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE; f->key_frame = f->pict_type == FF_I_TYPE; if (f->pict_type == FF_I_TYPE) { for(y=0; y<avctx->height; y++) memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ], &buf[y*avctx->width*3], f->linesize[0]); } break; case 2: case 4: /** * Fraps v2 is Huffman-coded YUV420 planes * Fraps v4 is virtually the same */ 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; } 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; } *frame = *f; *data_size = sizeof(AVFrame); return buf_size; } /** * closes decoder * @param avctx codec context * @return 0 on success or negative if fails */ static int decode_end(AVCodecContext *avctx) { FrapsContext *s = (FrapsContext*)avctx->priv_data; if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); av_freep(&s->tmpbuf); return 0; } AVCodec fraps_decoder = { "fraps", CODEC_TYPE_VIDEO, CODEC_ID_FRAPS, sizeof(FrapsContext), decode_init, NULL, decode_end, decode_frame, CODEC_CAP_DR1, };