mirror of
https://github.com/FFmpeg/FFmpeg.git
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b78e7197a8
and fix GPL/LGPL version mismatches. Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk
251 lines
7.4 KiB
C
251 lines
7.4 KiB
C
/*
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* Fraps FPS1 decoder
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* Copyright (c) 2005 Roine Gustafsson
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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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/**
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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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*
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* Only decodes version 0 and 1 files.
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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, which are the most commonly found Fraps files, cannot be
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* decoded yet.
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*/
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#include "avcodec.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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} 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->has_b_frames = 0;
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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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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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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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uint32_t *buf32;
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uint32_t *luma1,*luma2,*cb,*cr;
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header = LE_32(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 > 1) {
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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 and 1.\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=(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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/**
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* Fraps v2 sub-header description. All numbers are little-endian:
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* (this is all guesswork)
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*
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* 0: DWORD 'FPSx'
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* 4: DWORD 0x00000010 unknown, perhaps flags
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* 8: DWORD off_2 offset to plane 2
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* 12: DWORD off_3 offset to plane 3
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* 16: 256xDWORD freqtbl_1 frequency table for plane 1
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* 1040: plane_1
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* ...
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* off_2: 256xDWORD freqtbl_2 frequency table for plane 2
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* plane_2
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* ...
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* off_3: 256xDWORD freqtbl_3 frequency table for plane 3
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* plane_3
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*/
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if ((BE_32(buf) != FPS_TAG)||(buf_size < (3*1024 + 8))) {
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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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/* NOT FINISHED */
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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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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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};
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