[FFmpeg-devel] [PATCH 1/1] [ffmpeg-deve] avcodec/mpegaudiodec optimizing code size

[chenyu202107@gmail.com]

From: chenyu <chenyu202107@gmail.com>

Optimizing 160k code size by converting static array to dynamic malloc memory.

Signed-off-by: chenyu <chenyu202107@gmail.com>
---
 libavcodec/mpegaudiodata.h                |  4 ++--
 libavcodec/mpegaudiodec_common_tablegen.h | 10 ++++++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/libavcodec/mpegaudiodata.h b/libavcodec/mpegaudiodata.h
index 720c4bee64..6dfb74cd01 100644
--- a/libavcodec/mpegaudiodata.h
+++ b/libavcodec/mpegaudiodata.h
@@ -50,8 +50,8 @@ extern const unsigned char * const ff_mpa_alloc_tables[5];
 extern const int8_t   ff_table_4_3_exp  [TABLE_4_3_SIZE];
 extern const uint32_t ff_table_4_3_value[TABLE_4_3_SIZE];
 #else
-extern int8_t   ff_table_4_3_exp  [TABLE_4_3_SIZE];
-extern uint32_t ff_table_4_3_value[TABLE_4_3_SIZE];
+extern int8_t   *ff_table_4_3_exp;
+extern uint32_t *ff_table_4_3_value;
 #endif
 
 /* VLCs for decoding layer 3 huffman tables */
diff --git a/libavcodec/mpegaudiodec_common_tablegen.h b/libavcodec/mpegaudiodec_common_tablegen.h
index bf402c9d84..66e93df27f 100644
--- a/libavcodec/mpegaudiodec_common_tablegen.h
+++ b/libavcodec/mpegaudiodec_common_tablegen.h
@@ -34,9 +34,10 @@
 #else
 #include <math.h>
 #include "libavutil/attributes.h"
+#include "libavutil/mem.h"
 
-int8_t   ff_table_4_3_exp  [TABLE_4_3_SIZE];
-uint32_t ff_table_4_3_value[TABLE_4_3_SIZE];
+int8_t   *ff_table_4_3_exp;
+uint32_t *ff_table_4_3_value;
 
 #define FRAC_BITS 23
 #define IMDCT_SCALAR 1.759
@@ -51,6 +52,11 @@ static av_cold void mpegaudiodec_common_tableinit(void)
     };
     double pow43_val = 0;
 
+#if !CONFIG_HARDCODED_TABLES
+    ff_table_4_3_exp = (int8_t *)av_calloc(TABLE_4_3_SIZE, sizeof(int8_t));
+    ff_table_4_3_value = (uint32_t *)av_calloc(TABLE_4_3_SIZE, sizeof(uint32_t));
+#endif
+
     for (int i = 1; i < TABLE_4_3_SIZE; i++) {
         double f, fm;
         int e, m;
-- 
2.34.1

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