avcodec/ac3enc: Move EAC-3 specific initialization to eac3enc.c

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/ac3enc.c

@@ -2555,8 +2555,6 @@ av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
 
     s->avctx = avctx;
 
-    s->eac3 = avctx->codec_id == AV_CODEC_ID_EAC3;
-
     ret = validate_options(s);
     if (ret)
         return ret;
@@ -2579,11 +2577,7 @@ av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
         s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
     }
 
-    if (CONFIG_EAC3_ENCODER && s->eac3) {
-        static AVOnce init_static_once_eac3 = AV_ONCE_INIT;
-        ff_thread_once(&init_static_once_eac3, ff_eac3_exponent_init);
-        s->output_frame_header = ff_eac3_output_frame_header;
-    } else
+    if (!s->output_frame_header)
         s->output_frame_header = ac3_output_frame_header;
 
     set_bandwidth(s);

libavcodec/eac3enc.c

@@ -27,6 +27,7 @@
 #define AC3ENC_FLOAT 1
 
 #include "libavutil/attributes.h"
+#include "libavutil/thread.h"
 #include "ac3enc.h"
 #include "codec_internal.h"
 #include "eac3enc.h"
@@ -47,7 +48,10 @@ static const AVClass eac3enc_class = {
 static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4];
 
 
-av_cold void ff_eac3_exponent_init(void)
+/**
+ * Initialize E-AC-3 exponent tables.
+ */
+static av_cold void eac3_exponent_init(void)
 {
     int i;
 
@@ -122,8 +126,10 @@ void ff_eac3_set_cpl_states(AC3EncodeContext *s)
     }
 }
 
-
-void ff_eac3_output_frame_header(AC3EncodeContext *s)
+/**
+ * Write the E-AC-3 frame header to the output bitstream.
+ */
+static void eac3_output_frame_header(AC3EncodeContext *s)
 {
     int blk, ch;
     AC3EncOptions *opt = &s->options;
@@ -243,6 +249,18 @@ void ff_eac3_output_frame_header(AC3EncodeContext *s)
         put_bits(&s->pb, 1, 0);
 }
 
+static av_cold int eac3_encode_init(AVCodecContext *avctx)
+{
+    static AVOnce init_static_once = AV_ONCE_INIT;
+    AC3EncodeContext *s = avctx->priv_data;
+
+    s->eac3 = 1;
+    s->output_frame_header = eac3_output_frame_header;
+
+    ff_thread_once(&init_static_once, eac3_exponent_init);
+
+    return ff_ac3_float_encode_init(avctx);
+}
 
 const FFCodec ff_eac3_encoder = {
     .p.name          = "eac3",
@@ -251,7 +269,7 @@ const FFCodec ff_eac3_encoder = {
     .p.id            = AV_CODEC_ID_EAC3,
     .p.capabilities  = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
     .priv_data_size  = sizeof(AC3EncodeContext),
-    .init            = ff_ac3_float_encode_init,
+    .init            = eac3_encode_init,
     FF_CODEC_ENCODE_CB(ff_ac3_encode_frame),
     .close           = ff_ac3_encode_close,
     .p.sample_fmts   = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,

libavcodec/eac3enc.h

@@ -29,11 +29,6 @@
 
 #include "ac3enc.h"
 
-/**
- * Initialize E-AC-3 exponent tables.
- */
-void ff_eac3_exponent_init(void);
-
 /**
  * Determine frame exponent strategy use and indices.
  */
@@ -46,9 +41,4 @@ void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s);
  */
 void ff_eac3_set_cpl_states(AC3EncodeContext *s);
 
-/**
- * Write the E-AC-3 frame header to the output bitstream.
- */
-void ff_eac3_output_frame_header(AC3EncodeContext *s);
-
 #endif /* AVCODEC_EAC3ENC_H */