avcodec/shorten: Fix multiple integer overflows

[ffmpeg] / libavcodec / utils.c

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index dfbfe98d639d3f6f7138b248e45a2ef943583132..59d41ccbb64db10eafb3f3752bf9e34867975716 100644 (file)
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -26,7 +26,6 @@
  */
 
 #include "config.h"
-#include "libavutil/atomic.h"
 #include "libavutil/attributes.h"
 #include "libavutil/avassert.h"
 #include "libavutil/avstring.h"
@@ -47,7 +46,6 @@
 #include "decode.h"
 #include "hwaccel.h"
 #include "libavutil/opt.h"
-#include "me_cmp.h"
 #include "mpegvideo.h"
 #include "thread.h"
 #include "frame_thread_encoder.h"
@@ -93,30 +91,6 @@ void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
         memset(*p, 0, min_size + AV_INPUT_BUFFER_PADDING_SIZE);
 }
 
-/* encoder management */
-static AVCodec *first_avcodec = NULL;
-static AVCodec **last_avcodec = &first_avcodec;
-
-AVCodec *av_codec_next(const AVCodec *c)
-{
-    if (c)
-        return c->next;
-    else
-        return first_avcodec;
-}
-
-static av_cold void avcodec_init(void)
-{
-    static int initialized = 0;
-
-    if (initialized != 0)
-        return;
-    initialized = 1;
-
-    if (CONFIG_ME_CMP)
-        ff_me_cmp_init_static();
-}
-
 int av_codec_is_encoder(const AVCodec *codec)
 {
     return codec && (codec->encode_sub || codec->encode2 ||codec->send_frame);
@@ -127,21 +101,6 @@ int av_codec_is_decoder(const AVCodec *codec)
     return codec && (codec->decode || codec->receive_frame);
 }
 
-av_cold void avcodec_register(AVCodec *codec)
-{
-    AVCodec **p;
-    avcodec_init();
-    p = last_avcodec;
-    codec->next = NULL;
-
-    while(*p || avpriv_atomic_ptr_cas((void * volatile *)p, NULL, codec))
-        p = &(*p)->next;
-    last_avcodec = &codec->next;
-
-    if (codec->init_static_data)
-        codec->init_static_data(codec);
-}
-
 int ff_set_dimensions(AVCodecContext *s, int width, int height)
 {
     int ret = av_image_check_size2(width, height, s->max_pixels, AV_PIX_FMT_NONE, 0, s);
@@ -353,7 +312,10 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
 
     *width  = FFALIGN(*width, w_align);
     *height = FFALIGN(*height, h_align);
-    if (s->codec_id == AV_CODEC_ID_H264 || s->lowres) {
+    if (s->codec_id == AV_CODEC_ID_H264 || s->lowres ||
+        s->codec_id == AV_CODEC_ID_VP5  || s->codec_id == AV_CODEC_ID_VP6 ||
+        s->codec_id == AV_CODEC_ID_VP6F || s->codec_id == AV_CODEC_ID_VP6A
+    ) {
         // some of the optimized chroma MC reads one line too much
         // which is also done in mpeg decoders with lowres > 0
         *height += 2;
@@ -602,7 +564,7 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
 
     ff_lock_avcodec(avctx, codec);
 
-    avctx->internal = av_mallocz(sizeof(AVCodecInternal));
+    avctx->internal = av_mallocz(sizeof(*avctx->internal));
     if (!avctx->internal) {
         ret = AVERROR(ENOMEM);
         goto end;
@@ -1093,7 +1055,7 @@ void avsubtitle_free(AVSubtitle *sub)
 
     av_freep(&sub->rects);
 
-    memset(sub, 0, sizeof(AVSubtitle));
+    memset(sub, 0, sizeof(*sub));
 }
 
 av_cold int avcodec_close(AVCodecContext *avctx)
@@ -1162,71 +1124,6 @@ FF_ENABLE_DEPRECATION_WARNINGS
     return 0;
 }
 
-static enum AVCodecID remap_deprecated_codec_id(enum AVCodecID id)
-{
-    switch(id){
-        //This is for future deprecatec codec ids, its empty since
-        //last major bump but will fill up again over time, please don't remove it
-        default                                         : return id;
-    }
-}
-
-static AVCodec *find_encdec(enum AVCodecID id, int encoder)
-{
-    AVCodec *p, *experimental = NULL;
-    p = first_avcodec;
-    id= remap_deprecated_codec_id(id);
-    while (p) {
-        if ((encoder ? av_codec_is_encoder(p) : av_codec_is_decoder(p)) &&
-            p->id == id) {
-            if (p->capabilities & AV_CODEC_CAP_EXPERIMENTAL && !experimental) {
-                experimental = p;
-            } else
-                return p;
-        }
-        p = p->next;
-    }
-    return experimental;
-}
-
-AVCodec *avcodec_find_encoder(enum AVCodecID id)
-{
-    return find_encdec(id, 1);
-}
-
-AVCodec *avcodec_find_encoder_by_name(const char *name)
-{
-    AVCodec *p;
-    if (!name)
-        return NULL;
-    p = first_avcodec;
-    while (p) {
-        if (av_codec_is_encoder(p) && strcmp(name, p->name) == 0)
-            return p;
-        p = p->next;
-    }
-    return NULL;
-}
-
-AVCodec *avcodec_find_decoder(enum AVCodecID id)
-{
-    return find_encdec(id, 0);
-}
-
-AVCodec *avcodec_find_decoder_by_name(const char *name)
-{
-    AVCodec *p;
-    if (!name)
-        return NULL;
-    p = first_avcodec;
-    while (p) {
-        if (av_codec_is_decoder(p) && strcmp(name, p->name) == 0)
-            return p;
-        p = p->next;
-    }
-    return NULL;
-}
-
 const char *avcodec_get_name(enum AVCodecID id)
 {
     const AVCodecDescriptor *cd;