Build: fix stack linker warning with ffmpeg on macOS

The ff_cfhd_init_vlcs() function was using a lot of stack space, which
made linker on macOS unhappy. Using heap allocation allows to silence
the warning without causing other side-effects.

Kept the patch enabled for all platforms to avoid difference in behavior
and performance on different platforms, which could make certain types
of investigation very tricky.

Differential Revision: https://developer.blender.org/D8248

1 files changed, 59 insertions, 0 deletions

diff --git a/build_files/build_environment/patches/ffmpeg.diff b/build_files/build_environment/patches/ffmpeg.diff
index 960728ae980..e195ca272de 100644
--- a/build_files/build_environment/patches/ffmpeg.diff
+++ b/build_files/build_environment/patches/ffmpeg.diff
@@ -9,3 +9,62 @@
  enabled libopenmpt        && require_pkg_config libopenmpt "libopenmpt >= 0.2.6557" libopenmpt/libopenmpt.h openmpt_module_create -lstdc++ && append libopenmpt_extralibs "-lstdc++"
  enabled libopus           && {
      enabled libopus_decoder && {
+--- a/libavcodec/cfhddata.c
++++ b/libavcodec/cfhddata.c
+@@ -276,10 +276,10 @@
+ av_cold int ff_cfhd_init_vlcs(CFHDContext *s)
+ {
+     int i, j, ret = 0;
+-    uint32_t new_cfhd_vlc_bits[NB_VLC_TABLE_18 * 2];
+-    uint8_t  new_cfhd_vlc_len[NB_VLC_TABLE_18 * 2];
+-    uint16_t new_cfhd_vlc_run[NB_VLC_TABLE_18 * 2];
+-    int16_t  new_cfhd_vlc_level[NB_VLC_TABLE_18 * 2];
++    uint32_t *new_cfhd_vlc_bits = av_calloc(sizeof(uint32_t), NB_VLC_TABLE_18 * 2);
++    uint8_t  *new_cfhd_vlc_len = av_calloc(sizeof(uint8_t), NB_VLC_TABLE_18 * 2);
++    uint16_t *new_cfhd_vlc_run = av_calloc(sizeof(uint16_t), NB_VLC_TABLE_18 * 2);
++    int16_t  *new_cfhd_vlc_level = av_calloc(sizeof(int16_t), NB_VLC_TABLE_18 * 2);
+ 
+     /** Similar to dv.c, generate signed VLC tables **/
+ 
+@@ -305,8 +305,13 @@
+ 
+     ret = init_vlc(&s->vlc_9, VLC_BITS, j, new_cfhd_vlc_len,
+                    1, 1, new_cfhd_vlc_bits, 4, 4, 0);
+-    if (ret < 0)
++    if (ret < 0) {
++        av_free(new_cfhd_vlc_bits);
++        av_free(new_cfhd_vlc_len);
++        av_free(new_cfhd_vlc_run);
++        av_free(new_cfhd_vlc_level);
+         return ret;
++    }
+     for (i = 0; i < s->vlc_9.table_size; i++) {
+         int code = s->vlc_9.table[i][0];
+         int len  = s->vlc_9.table[i][1];
+@@ -346,8 +351,14 @@
+ 
+     ret = init_vlc(&s->vlc_18, VLC_BITS, j, new_cfhd_vlc_len,
+                    1, 1, new_cfhd_vlc_bits, 4, 4, 0);
+-    if (ret < 0)
++    if (ret < 0) {
++        av_free(new_cfhd_vlc_bits);
++        av_free(new_cfhd_vlc_len);
++        av_free(new_cfhd_vlc_run);
++        av_free(new_cfhd_vlc_level);
+         return ret;
++    }
++
+     av_assert0(s->vlc_18.table_size == 4572);
+ 
+     for (i = 0; i < s->vlc_18.table_size; i++) {
+@@ -367,5 +378,10 @@
+         s->table_18_rl_vlc[i].run   = run;
+     }
+ 
++    av_free(new_cfhd_vlc_bits);
++    av_free(new_cfhd_vlc_len);
++    av_free(new_cfhd_vlc_run);
++    av_free(new_cfhd_vlc_level);
++
+     return ret;
+ }