* ffmpeg update to 51.28.0

  * Workaround ffmpeg buggy codecs that don't release their DR1 frames.
  * Fix several segfaults and freezing problem with H264 streams that use a lot
    of reference frames (eg. 15)
  * Initial support to enable/disable ffmpeg codecs. Codecs may be disabled in
    groups by --disable-ffmpeg-uncommon-codecs/--disable-ffmpeg-popular-codecs
    Think of "uncommon" codecs what people would never want to play with their
    PDAs (they will save memory by removing them).
    Note: currently both uncommon/popular codecs are _build_ but disabled.
    that is, build system still need some improvements to really save memory.
warning: non-autoconf guru playing with the build system, likely breakage.

CVS patchset: 8499
CVS date: 2007/01/13 21:19:52

1 files changed, 28 insertions, 8 deletions

diff --git a/src/libffmpeg/libavcodec/cinepak.c b/src/libffmpeg/libavcodec/cinepak.c
index e137377e5..fd95b739e 100644
--- a/src/libffmpeg/libavcodec/cinepak.c
+++ b/src/libffmpeg/libavcodec/cinepak.c
@@ -26,6 +26,8 @@
  * by Ewald Snel <ewald@rambo.its.tudelft.nl>
  * For more information on the Cinepak algorithm, visit:
  *   http://www.csse.monash.edu.au/~timf/
+ * For more information on the quirky data inside Sega FILM/CPK files, visit:
+ *   http://wiki.multimedia.cx/index.php?title=Sega_FILM
  */
 
 #include <stdio.h>
@@ -67,6 +69,8 @@ typedef struct CinepakContext {
     int palette_video;
     cvid_strip_t strips[MAX_STRIPS];
 
+    int sega_film_skip_bytes;
+
 } CinepakContext;
 
 static void cinepak_decode_codebook (cvid_codebook_t *codebook,
@@ -319,8 +323,6 @@ static int cinepak_decode (CinepakContext *s)
     int           i, result, strip_size, frame_flags, num_strips;
     int           y0 = 0;
     int           encoded_buf_size;
-    /* if true, Cinepak data is from a Sega FILM/CPK file */
-    int           sega_film_data = 0;
 
     if (s->size < 10)
         return -1;
@@ -328,12 +330,29 @@ static int cinepak_decode (CinepakContext *s)
     frame_flags = s->data[0];
     num_strips  = BE_16 (&s->data[8]);
     encoded_buf_size = ((s->data[1] << 16) | BE_16 (&s->data[2]));
-    if (encoded_buf_size != s->size)
-        sega_film_data = 1;
-    if (sega_film_data)
-        s->data    += 12;
-    else
-        s->data    += 10;
+
+    /* if this is the first frame, check for deviant Sega FILM data */
+    if (s->sega_film_skip_bytes == -1) {
+        if (encoded_buf_size != s->size) {
+            /* If the encoded frame size differs from the frame size as indicated
+             * by the container file, this data likely comes from a Sega FILM/CPK file.
+             * If the frame header is followed by the bytes FE 00 00 06 00 00 then
+             * this is probably one of the two known files that have 6 extra bytes
+             * after the frame header. Else, assume 2 extra bytes. */
+            if ((s->data[10] == 0xFE) &&
+                (s->data[11] == 0x00) &&
+                (s->data[12] == 0x00) &&
+                (s->data[13] == 0x06) &&
+                (s->data[14] == 0x00) &&
+                (s->data[15] == 0x00))
+                s->sega_film_skip_bytes = 6;
+            else
+                s->sega_film_skip_bytes = 2;
+        } else
+            s->sega_film_skip_bytes = 0;
+    }
+
+    s->data += 10 + s->sega_film_skip_bytes;
 
     if (num_strips > MAX_STRIPS)
         num_strips = MAX_STRIPS;
@@ -377,6 +396,7 @@ static int cinepak_decode_init(AVCodecContext *avctx)
     s->avctx = avctx;
     s->width = (avctx->width + 3) & ~3;
     s->height = (avctx->height + 3) & ~3;
+    s->sega_film_skip_bytes = -1;  /* uninitialized state */
 
     // check for paletted data
     if ((avctx->palctrl == NULL) || (avctx->bits_per_sample == 40)) {