[FFmpeg-cvslog] rv34: use AVERROR return values in ff_rv34_decode_frame()

[Janne Grunau]

ffmpeg | branch: release/0.8 | Janne Grunau <janne-libav at jannau.net> | Mon Feb 13 21:14:19 2012 +0100| [99008ba3667a28af5efe0934aa20aa37df8dbd86] | committer: Reinhard Tartler

rv34: use AVERROR return values in ff_rv34_decode_frame()

Also adds an error message.
(cherry picked from commit 29330721b0e8514f9f8b4d54be75a662a2b79e44)

Signed-off-by: Anton Khirnov <anton at khirnov.net>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=99008ba3667a28af5efe0934aa20aa37df8dbd86
---

 libavcodec/rv34.c |   13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/libavcodec/rv34.c b/libavcodec/rv34.c
index cc1cae2..a20a989 100644
--- a/libavcodec/rv34.c
+++ b/libavcodec/rv34.c
@@ -1444,15 +1444,20 @@ int ff_rv34_decode_frame(AVCodecContext *avctx,
     if(get_slice_offset(avctx, slices_hdr, 0) < 0 ||
        get_slice_offset(avctx, slices_hdr, 0) > buf_size){
         av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
     init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), (buf_size-get_slice_offset(avctx, slices_hdr, 0))*8);
     if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){
         av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
-    if((!s->last_picture_ptr || !s->last_picture_ptr->data[0]) && si.type == AV_PICTURE_TYPE_B)
-        return -1;
+    if ((!s->last_picture_ptr || !s->last_picture_ptr->data[0]) &&
+        si.type == AV_PICTURE_TYPE_B) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid decoder state: B-frame without "
+               "reference data.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
     if(   (avctx->skip_frame >= AVDISCARD_NONREF && si.type==AV_PICTURE_TYPE_B)
        || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=AV_PICTURE_TYPE_I)
        ||  avctx->skip_frame >= AVDISCARD_ALL)