avcodec/iff: add support for ANIMs with keyframes and concatenated ANIMs

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 6 insertions, 9 deletions

diff --git a/libavcodec/iff.c b/libavcodec/iff.c
index 85fae1589e..9d7dce5596 100644
--- a/libavcodec/iff.c
+++ b/libavcodec/iff.c
@@ -63,7 +63,6 @@ typedef struct IffContext {
     uint8_t *video[2];
     unsigned video_size;
     uint32_t *pal[2];
-    int first;
 } IffContext;
 
 #define LUT8_PART(plane, v)                             \
@@ -422,7 +421,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
         s->pal[1] = av_calloc(256, sizeof(*s->pal[1]));
         if (!s->video[0] || !s->video[1] || !s->pal[0] || !s->pal[1])
             return AVERROR(ENOMEM);
-        s->first = 1;
     }
 
     if ((err = extract_header(avctx, NULL)) < 0)
@@ -1322,17 +1320,11 @@ static int decode_frame(AVCodecContext *avctx,
     }
     s->init = 1;
 
-    if (s->compression <= 0xff && avctx->codec_tag == MKTAG('A', 'N', 'I', 'M')) {
+    if (s->compression <= 0xff && (avctx->codec_tag == MKTAG('A', 'N', 'I', 'M'))) {
         if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
             memcpy(s->pal[0], s->frame->data[1], 256 * 4);
     }
 
-    if (s->compression > 0xff && s->first) {
-        memcpy(s->video[1], s->video[0], s->video_size);
-        memcpy(s->pal[1], s->pal[0], 256 * 4);
-        s->first = 0;
-    }
-
     switch (s->compression) {
     case 0x0:
         if (avctx->codec_tag == MKTAG('A', 'C', 'B', 'M')) {
@@ -1549,6 +1541,11 @@ static int decode_frame(AVCodecContext *avctx,
         return unsupported(avctx);
     }
 
+    if (s->compression <= 0xff && (avctx->codec_tag == MKTAG('A', 'N', 'I', 'M'))) {
+        memcpy(s->pal[1], s->pal[0], 256 * 4);
+        memcpy(s->video[1], s->video[0], s->video_size);
+    }
+
     if (s->compression > 0xff) {
         if (avctx->pix_fmt == AV_PIX_FMT_PAL8 || avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
             buf = s->video[0];