* introducing new public interface in imgconvert.c

       + avcodec_get_pix_fmt
         converts textual representation of pixel format into
	 the actual id. Complements avcodec_get_pix_fmt_name.
       + avpicture_layout
         serializes given picture into a flat array.
	 Complements avpicture_fill.

   * adding a new option -pix_fmt to the ffmpeg, in order to control
     pixel format for the codecs that do support it, like rawvideo,
     for example.

   * reducing complexity of the rawvideo codec by splitting it in two
     and making it more reliable via hooking up to the avpicture_layout.
     Plus adding new FourCC as described here: http://www.fourcc.org

   * A tiny fix for avienc.c that makes avih and video strf consistent
     regarding codec FourCC.

Originally committed as revision 1842 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 68 insertions, 103 deletions

diff --git a/libavcodec/raw.c b/libavcodec/raw.c
index 86591aae46..8c38b8e8c1 100644
--- a/libavcodec/raw.c
+++ b/libavcodec/raw.c
@@ -24,6 +24,12 @@
  
 #include "avcodec.h"
 
+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 */
+    AVFrame pic;             ///< AVCodecContext.coded_frame
+} RawVideoContext;
 
 typedef struct PixleFormatTag {
     int pix_fmt;
@@ -31,8 +37,19 @@ typedef struct PixleFormatTag {
 } PixelFormatTag;
 
 const PixelFormatTag pixelFormatTags[] = {
-    { PIX_FMT_YUV422, MKTAG('Y', '4', '2', '2') },
-    { PIX_FMT_YUV420P, MKTAG('I', '4', '2', '0') },
+    { PIX_FMT_YUV420P, MKTAG('I', '4', '2', '0') }, /* Planar formats */
+    { PIX_FMT_YUV420P, MKTAG('I', 'Y', 'U', 'V') },
+    { PIX_FMT_YUV410P, MKTAG('Y', 'U', 'V', '9') },
+    { PIX_FMT_YUV411P, MKTAG('Y', '4', '1', 'B') },
+    { PIX_FMT_YUV422P, MKTAG('Y', '4', '2', 'B') },
+    { PIX_FMT_GRAY8,   MKTAG('Y', '8', '0', '0') },
+    { PIX_FMT_GRAY8,   MKTAG(' ', ' ', 'Y', '8') },
+
+
+    { PIX_FMT_YUV422,  MKTAG('Y', '4', '2', '2') }, /* Packed formats */
+    { PIX_FMT_YUV422,  MKTAG('U', 'Y', 'V', 'Y') },
+    { PIX_FMT_GRAY8,   MKTAG('G', 'R', 'E', 'Y') },
+
     { -1, 0 },
 };
 
@@ -47,35 +64,37 @@ static int findPixelFormat(unsigned int fourcc)
     return PIX_FMT_YUV420P;
 }
 
+static unsigned int findFourCC(int fmt)
+{
+    const PixelFormatTag * tags = pixelFormatTags;
+    while (tags->pix_fmt >= 0) {
+        if (tags->pix_fmt == fmt)
+	    return tags->fourcc;
+	tags++; 
+    }
+    return 0;
+}
 
-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 */
-    AVFrame pic;             ///< AVCodecContext.coded_frame
-} RawVideoContext;
-
+/* RAW Decoder Implementation */
 
-static int raw_init(AVCodecContext *avctx)
+static int raw_init_decoder(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;
-
-    context->pic.pict_type= FF_I_TYPE;
-    context->pic.key_frame= 1;
+    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;
+    context->pic.pict_type = FF_I_TYPE;
+    context->pic.key_frame = 1;
+    
     avctx->coded_frame= &context->pic;
     
-    if (! context->buffer) {
+    if (!context->buffer)
         return -1;
-    }
-
+   
     return 0;
 }
 
@@ -110,102 +129,48 @@ static int raw_decode(AVCodecContext *avctx,
     return bytesNeeded;
 }
 
-static int raw_close(AVCodecContext *avctx)
+static int raw_close_decoder(AVCodecContext *avctx)
 {
     RawVideoContext *context = avctx->priv_data;
+    
+    av_freep(&context->buffer);
+    return 0;
+}
 
-    av_freep(& context->buffer);
+/* RAW Encoder Implementation */
 
+static int raw_init_encoder(AVCodecContext *avctx)
+{
+    avctx->coded_frame = (AVPicture*)avctx->priv_data;
+    avctx->coded_frame->pict_type = FF_I_TYPE;
+    avctx->coded_frame->key_frame = 1;
+    avctx->codec_tag = findFourCC(avctx->pix_fmt);
     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;
+    return avpicture_layout((AVPicture *)data, avctx->pix_fmt, avctx->width,
+                                               avctx->height, frame, buf_size);
 }
 
+AVCodec rawvideo_encoder = {
+    "rawvideo",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_RAWVIDEO,
+    sizeof(AVFrame),
+    raw_init_encoder,
+    raw_encode,
+};
 
-AVCodec rawvideo_codec = {
+AVCodec rawvideo_decoder = {
     "rawvideo",
     CODEC_TYPE_VIDEO,
     CODEC_ID_RAWVIDEO,
     sizeof(RawVideoContext),
-    raw_init,
-    raw_encode,
-    raw_close,
+    raw_init_decoder,
+    NULL,
+    raw_close_decoder,
     raw_decode,
 };