/* * Fraps FPS1 decoder * Copyright (c) 2005 Roine Gustafsson * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; 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 * * 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. */ #include "avcodec.h" #define FPS_TAG MKTAG('F', 'P', 'S', 'x') /** * local variable storage */ typedef struct FrapsContext{ AVCodecContext *avctx; AVFrame frame; } 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->has_b_frames = 0; avctx->pix_fmt= PIX_FMT_NONE; /* set in decode_frame */ s->avctx = avctx; s->frame.data[0] = NULL; 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; header = LE_32(buf); version = header & 0xff; header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */ if (version > 1) { 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); 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; yheight/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; xwidth; 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; yheight; y++) memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ], &buf[y*avctx->width*3], f->linesize[0]); } break; case 2: /** * 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 */ if ((BE_32(buf) != FPS_TAG)||(buf_size < (3*1024 + 8))) { av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n"); return -1; } /* NOT FINISHED */ 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); return 0; } AVCodec fraps_decoder = { "fraps", CODEC_TYPE_VIDEO, CODEC_ID_FRAPS, sizeof(FrapsContext), decode_init, NULL, decode_end, decode_frame, CODEC_CAP_DR1, };