[FFmpeg-cvslog] avcodec/mm: decode raw chunk type and skip unknown audio chunk type

[Peter Ross]

ffmpeg | branch: master | Peter Ross <pross at xvid.org> | Sat Jun  8 18:38:46 2024 +1000| [f298507323a688bf89e9d3b44d7529edf80de909] | committer: Peter Ross

avcodec/mm: decode raw chunk type and skip unknown audio chunk type

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f298507323a688bf89e9d3b44d7529edf80de909
---

 libavcodec/mmvideo.c | 11 +++++++++++
 libavformat/mm.c     |  9 +++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/libavcodec/mmvideo.c b/libavcodec/mmvideo.c
index d339967702..7313507deb 100644
--- a/libavcodec/mmvideo.c
+++ b/libavcodec/mmvideo.c
@@ -39,6 +39,7 @@
 
 #define MM_PREAMBLE_SIZE    6
 
+#define MM_TYPE_RAW         0x2
 #define MM_TYPE_INTER       0x5
 #define MM_TYPE_INTRA       0x8
 #define MM_TYPE_INTRA_HH    0xc
@@ -76,6 +77,15 @@ static av_cold int mm_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
+static int mm_decode_raw(MmContext * s)
+{
+    if (bytestream2_get_bytes_left(&s->gb) < s->avctx->width * s->avctx->height)
+        return AVERROR_INVALIDDATA;
+    for (int y = 0; y < s->avctx->height; y++)
+        bytestream2_get_buffer(&s->gb, s->frame->data[0] + y*s->frame->linesize[0], s->avctx->width);
+    return 0;
+}
+
 static void mm_decode_pal(MmContext *s)
 {
     int start = bytestream2_get_le16(&s->gb);
@@ -202,6 +212,7 @@ static int mm_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
         return res;
 
     switch(type) {
+    case MM_TYPE_RAW       : res = mm_decode_raw(s); break;
     case MM_TYPE_PALETTE   : mm_decode_pal(s); return avpkt->size;
     case MM_TYPE_INTRA     : res = mm_decode_intra(s, 0, 0); break;
     case MM_TYPE_INTRA_HH  : res = mm_decode_intra(s, 1, 0); break;
diff --git a/libavformat/mm.c b/libavformat/mm.c
index a99feae6e9..74e2716926 100644
--- a/libavformat/mm.c
+++ b/libavformat/mm.c
@@ -40,17 +40,20 @@
 #define MM_PREAMBLE_SIZE    6
 
 #define MM_TYPE_HEADER      0x0
+#define MM_TYPE_RAW         0x2
 #define MM_TYPE_INTER       0x5
 #define MM_TYPE_INTRA       0x8
 #define MM_TYPE_INTRA_HH    0xc
 #define MM_TYPE_INTER_HH    0xd
 #define MM_TYPE_INTRA_HHV   0xe
 #define MM_TYPE_INTER_HHV   0xf
+#define MM_TYPE_AUDIO2      0x14
 #define MM_TYPE_AUDIO       0x15
 #define MM_TYPE_PALETTE     0x31
 
 #define MM_HEADER_LEN_V     0x16    /* video only */
 #define MM_HEADER_LEN_AV    0x18    /* video + audio */
+#define MM_HEADER_LEN_AV2   0x1a
 
 #define MM_PALETTE_COUNT    128
 #define MM_PALETTE_SIZE     (MM_PALETTE_COUNT*3)
@@ -68,7 +71,7 @@ static int probe(const AVProbeData *p)
     if (AV_RL16(&p->buf[0]) != MM_TYPE_HEADER)
         return 0;
     len = AV_RL32(&p->buf[2]);
-    if (len != MM_HEADER_LEN_V && len != MM_HEADER_LEN_AV)
+    if (len != MM_HEADER_LEN_V && len != MM_HEADER_LEN_AV && len != MM_HEADER_LEN_AV2)
         return 0;
     fps = AV_RL16(&p->buf[8]);
     w = AV_RL16(&p->buf[12]);
@@ -118,7 +121,7 @@ static int read_header(AVFormatContext *s)
     avpriv_set_pts_info(st, 64, 1, frame_rate);
 
     /* audio stream */
-    if (length == MM_HEADER_LEN_AV) {
+    if (length >= MM_HEADER_LEN_AV) {
         st = avformat_new_stream(s, NULL);
         if (!st)
             return AVERROR(ENOMEM);
@@ -154,6 +157,7 @@ static int read_packet(AVFormatContext *s,
         length = AV_RL16(&preamble[2]);
 
         switch(type) {
+        case MM_TYPE_RAW :
         case MM_TYPE_PALETTE :
         case MM_TYPE_INTER :
         case MM_TYPE_INTRA :
@@ -186,6 +190,7 @@ static int read_packet(AVFormatContext *s,
 
         default :
             av_log(s, AV_LOG_INFO, "unknown chunk type 0x%x\n", type);
+        case MM_TYPE_AUDIO2 :
             avio_skip(pb, length);
         }
     }