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Fraps FPS1 video decoder (v1 & v2), courtesy of Roine Gustafsson <roine
at users sf net> Originally committed as revision 4264 to svn://svn.ffmpeg.org/ffmpeg/trunk
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,248 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| #include "avcodec.h" | ||
|
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| #define FPS_TAG MKTAG('F', 'P', 'S', '1') | ||
|
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| /** | ||
| * local variable storage | ||
| */ | ||
| typedef struct FrapsContext{ | ||
| AVCodecContext *avctx; | ||
| AVFrame frame; | ||
| } FrapsContext; | ||
|
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|
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| /** | ||
| * 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; | ||
|
|
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| avctx->coded_frame = (AVFrame*)&s->frame; | ||
| avctx->has_b_frames = 0; | ||
| avctx->pix_fmt= PIX_FMT_NONE; /* set in decode_frame */ | ||
|
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| s->avctx = avctx; | ||
| s->frame.data[0] = NULL; | ||
|
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| return 0; | ||
| } | ||
|
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|
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| /** | ||
| * 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; | ||
|
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|
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| header = LE_32(buf); | ||
| version = header & 0xff; | ||
| header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */ | ||
|
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| 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; | ||
| } | ||
|
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| buf+=4; | ||
| if (header_size == 8) | ||
| buf+=4; | ||
|
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| switch(version) { | ||
| case 0: | ||
| default: | ||
| /* Fraps v0 is a reordered YUV420 */ | ||
| avctx->pix_fmt = PIX_FMT_YUV420P; | ||
|
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||
| 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; | ||
| } | ||
|
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| 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; | ||
| } | ||
|
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| 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; | ||
|
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| 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; | ||
|
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| case 1: | ||
| /* Fraps v1 is an upside-down BGR24 */ | ||
| avctx->pix_fmt = PIX_FMT_BGR24; | ||
|
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| 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; | ||
| } | ||
|
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| 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; | ||
|
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| 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; | ||
|
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||
| 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; | ||
| } | ||
|
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| /* NOT FINISHED */ | ||
|
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| break; | ||
| } | ||
|
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| *frame = *f; | ||
| *data_size = sizeof(AVFrame); | ||
|
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| return buf_size; | ||
| } | ||
|
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|
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| /** | ||
| * 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; | ||
|
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| if (s->frame.data[0]) | ||
| avctx->release_buffer(avctx, &s->frame); | ||
|
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| return 0; | ||
| } | ||
|
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| 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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