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

1 files changed, 248 insertions, 0 deletions

diff --git a/libavcodec/fraps.c b/libavcodec/fraps.c
new file mode 100644
index 0000000000..a8fbbf106f
--- /dev/null
+++ b/libavcodec/fraps.c
@@ -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.
+ */
+ 
+#include "avcodec.h"
+
+#define FPS_TAG MKTAG('F', 'P', 'S', '1')
+
+/**
+ * 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,
+};