Merge remote-tracking branch 'cehoyos/master'

* cehoyos/master:
  Avoid a possible overflow when reading Nikon avi files.
  Add h263dsp dependency to mpeg1video and mpeg2video encoders.
  Fix compilation with --disable-hwaccel=mpeg1_xvmc,mpeg2_xvmc
Merged-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -1962,9 +1962,9 @@ mpc8_decoder_select="dsputil mpegaudiodsp"
 mpeg_xvmc_decoder_deps="X11_extensions_XvMClib_h"
 mpeg_xvmc_decoder_select="mpeg2video_decoder"
 mpeg1video_decoder_select="error_resilience mpegvideo"
-mpeg1video_encoder_select="aandcttables mpegvideoenc"
+mpeg1video_encoder_select="aandcttables mpegvideoenc h263dsp"
 mpeg2video_decoder_select="error_resilience mpegvideo"
-mpeg2video_encoder_select="aandcttables mpegvideoenc"
+mpeg2video_encoder_select="aandcttables mpegvideoenc h263dsp"
 mpeg4_decoder_select="h263_decoder mpeg4video_parser"
 mpeg4_encoder_select="h263_encoder"
 msmpeg4v1_decoder_select="h263_decoder"

libavcodec/mpeg12dec.c

@@ -770,7 +770,7 @@ static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
             memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
         s->mb_intra = 1;
         // if 1, we memcpy blocks in xvmcvideo
-        if (CONFIG_XVMC && s->pack_pblocks) {
+        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks) {
             ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
         }
 
@@ -986,7 +986,7 @@ static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
             }
 
             //if 1, we memcpy blocks in xvmcvideo
-            if (CONFIG_XVMC && s->pack_pblocks) {
+            if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks) {
                 ff_xvmc_pack_pblocks(s, cbp);
             }
 
@@ -1700,7 +1700,7 @@ static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
 
     for (;;) {
         // If 1, we memcpy blocks in xvmcvideo.
-        if (CONFIG_XVMC && s->pack_pblocks)
+        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
             ff_xvmc_init_block(s); // set s->block
 
         if (mpeg_decode_mb(s, s->block) < 0)

libavformat/avidec.c

@@ -350,8 +350,7 @@ static void avi_read_nikon(AVFormatContext *s, uint64_t end)
                 uint16_t size    = avio_rl16(s->pb);
                 const char *name = NULL;
                 char buffer[64]  = { 0 };
-                if (avio_tell(s->pb) + size > tag_end)
-                    size = tag_end - avio_tell(s->pb);
+                size = FFMIN(size, tag_end - avio_tell(s->pb));
                 size -= avio_read(s->pb, buffer,
                                   FFMIN(size, sizeof(buffer) - 1));
                 switch (tag) {