[FFmpeg-devel] [PATCH] support raw avi for raw PAL8 or Gray8 pixel data

[rui.jiang]

add palette data in avi header when the input data is raw PAL8 or Gray8 pixel data and the output data is 8bit raw avi video;

Here is a sample:
the codec params like:
        st->codecpar->bits_per_raw_sample=8;
        st->codecpar->bits_per_coded_sample=8;
        st->codecpar->format = AV_PIX_FMT_GRAY8;//AV_PIX_FMT_PAL8;
the input data like:
        int width = 320;
        int height = 480;
        int BUFSIZE = width * height;
        uint8_t* buffer = new unsigned char[BUFSIZE];

---
 libavformat/riffenc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/libavformat/riffenc.c b/libavformat/riffenc.c
index 43c8bf957a..bc654b3cd3 100644
--- a/libavformat/riffenc.c
+++ b/libavformat/riffenc.c
@@ -228,7 +228,8 @@ void ff_put_bmp_header(AVIOContext *pb, AVCodecParameters *par,
     pal_avi = !for_asf &&
               (pix_fmt == AV_PIX_FMT_PAL8 ||
                pix_fmt == AV_PIX_FMT_MONOWHITE ||
-               pix_fmt == AV_PIX_FMT_MONOBLACK);
+               pix_fmt == AV_PIX_FMT_MONOBLACK ||
+               pix_fmt == AV_PIX_FMT_GRAY8);
 
     /* Size (not including the size of the color table or color masks) */
     avio_wl32(pb, 40 + (ignore_extradata || pal_avi ? 0 : extradata_size));
@@ -263,6 +264,13 @@ void ff_put_bmp_header(AVIOContext *pb, AVCodecParameters *par,
                     avio_wl32(pb, 0xffffff);
                 else if (i == 1 && pix_fmt == AV_PIX_FMT_MONOBLACK)
                     avio_wl32(pb, 0xffffff);
+                else if (pix_fmt == AV_PIX_FMT_PAL8 || pix_fmt == AV_PIX_FMT_GRAY8) {
+                    /* Initialize palette */
+                    avio_w8(pb,i);
+                    avio_w8(pb,i);
+                    avio_w8(pb,i);
+                    avio_w8(pb,0);
+                }
                 else
                     avio_wl32(pb, 0);
             }
-- 
2.30.1 (Apple Git-130)