[FFmpeg-devel] [PATCH] DeluxePaint Animation playback system

[Stephen Backway]

On Wed, 2009-08-26 at 20:45 +1000, Peter Ross wrote:
> Samples: http://www.google.com.au/search?q=filetype%3Aanm+lpf+anim
>          (or any of the .ANM files bundled with Duke Nukem 3D...)
> 
> Details: http://wiki.multimedia.cx/index.php?title=DeluxePaint_Animation
> 
> Cheers,
> 
> -- Peter

To save Diego some typing...

diff --git a/libavcodec/anm.c b/libavcodec/anm.c
new file mode 100644
index 0000000..72cc625
--- /dev/null
+++ b/libavcodec/anm.c
@@ -0,0 +1,151 @@

[...]

+static av_cold int decode_init(AVCodecContext *avctx){
+    AnmContext *s = avctx->priv_data;
+    uint8_t *buf;
+    int i;
+
+    avctx->pix_fmt = PIX_FMT_PAL8;
+
+    if (avctx->extradata_size != 16*8 + 4*256)
+        return -1;
+
+    /* manually allocate frame of width * height */
+    s->frame.reference = 1;
+    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
+    s->frame.linesize[0] = avctx->width;
+    s->frame.data[0] = av_malloc(avctx->width*avctx->height);
+    if (!s->frame.data[0])
+        return AVERROR_NOMEM;
+    s->frame.data[1] = av_malloc(AVPALETTE_SIZE);

align above. (and other places in this file [the demuxer appears to have
better alignment]).

+    if (!s->frame.data[1]) {
+        av_freep(&s->frame.data[0]);
+        return AVERROR_NOMEM;
+    }
+
+    buf = avctx->extradata + 16*8;
+    for(i = 0; i < 256; i++) {
+        ((int*)s->frame.data[1])[i] = AV_RL32(buf);
+        buf += 4;
+    }

perhaps use bytestream_get_le32(&buf) instead of AV_RL32(buf) and buf +=
4.

[...]
+
+static int decode_frame(AVCodecContext *avctx,
+                            void *data, int *data_size,
+                            AVPacket *avpkt)

alignment

[...]

diff --git a/libavformat/anm.c b/libavformat/anm.c
new file mode 100644
index 0000000..d0a2632
--- /dev/null
+++ b/libavformat/anm.c
[...]
+static int read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)

alignment.

Regards,
Stephen.