{configure,avformat/movenc}: enable AC-3 parser for movenc

This simplifies the code to no longer have #ifs in a manner which
does not require handling avpriv_ac3_parse_header returning ENOSYS.

As an existing example, the MPEG-TS muxer already requires the AC-3
parser, and in order to fix existing issues with the current AC-3
movenc code, switching to use the AC-3 parser is required, so this
is an enabling change for that.

Signed-off-by: Jan Ekström <jan.ekstrom@24i.com>

configure

@@ -3444,7 +3444,7 @@ mlp_demuxer_select="mlp_parser"
 mmf_muxer_select="riffenc"
 mov_demuxer_select="iso_media riffdec"
 mov_demuxer_suggest="zlib"
-mov_muxer_select="iso_media riffenc rtpenc_chain vp9_superframe_bsf aac_adtstoasc_bsf"
+mov_muxer_select="iso_media riffenc rtpenc_chain vp9_superframe_bsf aac_adtstoasc_bsf ac3_parser"
 mp3_demuxer_select="mpegaudio_parser"
 mp3_muxer_select="mpegaudioheader"
 mp4_muxer_select="mov_muxer"

libavformat/movenc.c

@@ -408,7 +408,6 @@ struct eac3_info {
     } substream[1]; /* TODO: support 8 independent substreams */
 };
 
-#if CONFIG_AC3_PARSER
 static int handle_eac3(MOVMuxContext *mov, AVPacket *pkt, MOVTrack *track)
 {
     AC3HeaderInfo *hdr = NULL;
@@ -549,7 +548,6 @@ end:
 
     return ret;
 }
-#endif
 
 static int mov_write_eac3_tag(AVFormatContext *s, AVIOContext *pb, MOVTrack *track)
 {
@@ -6093,7 +6091,6 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
             }
         }
 
-#if CONFIG_AC3_PARSER
     } else if (par->codec_id == AV_CODEC_ID_EAC3) {
         size = handle_eac3(mov, pkt, trk);
         if (size < 0)
@@ -6101,7 +6098,6 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
         else if (!size)
             goto end;
         avio_write(pb, pkt->data, size);
-#endif
     } else if (par->codec_id == AV_CODEC_ID_EIA_608) {
         size = 8;