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ffmpeg/libavcodec/fraps.c

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/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/**
* @file fraps.c
* Lossless Fraps 'FPS1' decoder
* @author Roine Gustafsson <roine at users sf net>
*
* Only decodes version 0 and 1 files.
* Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
*
* 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; 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:
/**
* 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,
};
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