rawvideo patch by (Fred Rothganger <rothgang at uiuc dot edu>)

Originally committed as revision 1687 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/raw.c

@@ -0,0 +1,204 @@
+/*
+ * Raw Video Codec
+ * Copyright (c) 2001 Fabrice Bellard.
+ *
+ * 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 raw.c
+ * Raw Video Codec
+ */
+ 
+#include "avcodec.h"
+
+
+typedef struct PixleFormatTag {
+    int pix_fmt;
+    unsigned int fourcc;
+} PixelFormatTag;
+
+const PixelFormatTag pixelFormatTags[] = {
+    { PIX_FMT_YUV422, MKTAG('Y', '4', '2', '2') },
+    { -1, 0 },
+};
+
+static int findPixelFormat(unsigned int fourcc)
+{
+    const PixelFormatTag * tags = pixelFormatTags;
+    while (tags->pix_fmt >= 0) {
+        if (tags->fourcc == fourcc)
+            return tags->pix_fmt;
+        tags++;
+    }
+    return PIX_FMT_YUV420P;
+}
+
+
+typedef struct RawVideoContext {
+    unsigned char * buffer;  /* block of memory for holding one frame */
+    unsigned char * p;       /* current position in buffer */
+    int             length;  /* number of bytes in buffer */
+} RawVideoContext;
+
+
+static int raw_init(AVCodecContext *avctx)
+{
+    RawVideoContext *context = avctx->priv_data;
+
+    if (avctx->codec_tag) {
+	    avctx->pix_fmt = findPixelFormat(avctx->codec_tag);
+    }
+
+	context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
+	context->buffer = av_malloc(context->length);
+	context->p      = context->buffer;
+
+    if (! context->buffer) {
+        return -1;
+    }
+
+    return 0;
+}
+
+static int raw_decode(AVCodecContext *avctx,
+			    void *data, int *data_size,
+			    uint8_t *buf, int buf_size)
+{
+    RawVideoContext *context = avctx->priv_data;
+
+    AVPicture * picture = (AVPicture *) data;
+
+    /* Early out without copy if packet size == frame size */
+    if (buf_size == context->length  &&  context->p == context->buffer) {
+        avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
+        *data_size = sizeof(AVPicture);
+        return buf_size;
+    }
+
+    int bytesNeeded = context->length - (context->p - context->buffer);
+    if (buf_size < bytesNeeded) {
+        memcpy(context->p, buf, buf_size);
+        context->p += buf_size;
+        *data_size = 0;
+        return buf_size;
+    }
+
+    memcpy(context->p, buf, bytesNeeded);
+    context->p = context->buffer;
+    avpicture_fill(picture, context->buffer, avctx->pix_fmt, avctx->width, avctx->height);
+    *data_size = sizeof(AVPicture);
+    return bytesNeeded;
+}
+
+static int raw_close(AVCodecContext *avctx)
+{
+    RawVideoContext *context = avctx->priv_data;
+
+    av_freep(& context->buffer);
+
+    return 0;
+}
+
+static int raw_encode(AVCodecContext *avctx,
+			    unsigned char *frame, int buf_size, void *data)
+{
+	AVPicture * picture = data;
+
+    unsigned char *src;
+	unsigned char *dest = frame;
+    int i, j;
+
+	int w = avctx->width;
+	int h = avctx->height;
+	int size = avpicture_get_size(avctx->pix_fmt, w, h);
+
+    if (size > buf_size) {
+        return -1;
+    }
+
+    switch(avctx->pix_fmt) {
+    case PIX_FMT_YUV420P:
+        for(i=0;i<3;i++) {
+            if (i == 1) {
+                w >>= 1;
+                h >>= 1;
+            }
+            src = picture->data[i];
+            for(j=0;j<h;j++) {
+                memcpy(dest, src, w);
+                dest += w;
+                src += picture->linesize[i];
+            }
+        }
+        break;
+    case PIX_FMT_YUV422P:
+        for(i=0;i<3;i++) {
+            if (i == 1) {
+                w >>= 1;
+            }
+            src = picture->data[i];
+            for(j=0;j<h;j++) {
+                memcpy(dest, src, w);
+                dest += w;
+                src += picture->linesize[i];
+            }
+        }
+        break;
+    case PIX_FMT_YUV444P:
+        for(i=0;i<3;i++) {
+            src = picture->data[i];
+            for(j=0;j<h;j++) {
+                memcpy(dest, src, w);
+                dest += w;
+                src += picture->linesize[i];
+            }
+        }
+        break;
+    case PIX_FMT_YUV422:
+        src = picture->data[0];
+        for(j=0;j<h;j++) {
+            memcpy(dest, src, w * 2);
+            dest += w * 2;
+            src += picture->linesize[0];
+        }
+        break;
+    case PIX_FMT_RGB24:
+    case PIX_FMT_BGR24:
+        src = picture->data[0];
+        for(j=0;j<h;j++) {
+            memcpy(dest, src, w * 3);
+            dest += w * 3;
+            src += picture->linesize[0];
+        }
+        break;
+    default:
+        return -1;
+    }
+
+    return size;
+}
+
+
+AVCodec rawvideo_codec = {
+    "rawvideo",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_RAWVIDEO,
+    sizeof(RawVideoContext),
+    raw_init,
+    raw_encode,
+    raw_close,
+    raw_decode,
+};