h263dec: Propagate AV_LOG_ERRORs from slice decoding through frame decoding...

h263dec: Propagate AV_LOG_ERRORs from slice decoding through frame decoding with sufficient error recognition
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

doc/ffmpeg.texi

@@ -470,6 +470,8 @@ FF_ER_COMPLIANT
 FF_ER_AGGRESSIVE
 @item 4
 FF_ER_VERY_AGGRESSIVE
+@item 5
+FF_ER_EXPLODE
 @end table
 
 @item -ec @var{bit_mask}

libavcodec/avcodec.h

@@ -1446,6 +1446,7 @@ typedef struct AVCodecContext {
 #define FF_ER_COMPLIANT       2
 #define FF_ER_AGGRESSIVE      3
 #define FF_ER_VERY_AGGRESSIVE 4
+#define FF_ER_EXPLODE         5
 
     /**
      * Called at the beginning of each frame to get a buffer for it.

libavcodec/h263dec.c

@@ -638,7 +638,7 @@ retry:
     s->mb_x=0;
     s->mb_y=0;
 
-    decode_slice(s);
+    ret = decode_slice(s);
     while(s->mb_y<s->mb_height){
         if(s->msmpeg4_version){
             if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_count(&s->gb) > s->gb.size_in_bits)
@@ -654,7 +654,7 @@ retry:
         if(s->msmpeg4_version<4 && s->h263_pred)
             ff_mpeg4_clean_buffers(s);
 
-        decode_slice(s);
+        if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
     }
 
     if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
@@ -722,7 +722,7 @@ assert(s->current_picture.pict_type == s->pict_type);
 av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
 #endif
 
-    return get_consumed_bytes(s, buf_size);
+    return (ret && avctx->error_recognition >= FF_ER_EXPLODE)?ret:get_consumed_bytes(s, buf_size);
 }
 
 AVCodec ff_h263_decoder = {

libavcodec/options.c

@@ -184,6 +184,7 @@ static const AVOption options[]={
 {"compliant", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_ER_COMPLIANT }, INT_MIN, INT_MAX, V|D, "er"},
 {"aggressive", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_ER_AGGRESSIVE }, INT_MIN, INT_MAX, V|D, "er"},
 {"very_aggressive", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_ER_VERY_AGGRESSIVE }, INT_MIN, INT_MAX, V|D, "er"},
+{"explode", "abort decoding on error recognition", 0, FF_OPT_TYPE_CONST, {.dbl = FF_ER_EXPLODE }, INT_MIN, INT_MAX, V|D, "er"},
 {"has_b_frames", NULL, OFFSET(has_b_frames), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, INT_MIN, INT_MAX},
 {"block_align", NULL, OFFSET(block_align), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, INT_MIN, INT_MAX},
 {"parse_only", NULL, OFFSET(parse_only), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, INT_MIN, INT_MAX},