Add support for AAC audio codec

Add option --audio-codec=aac.

app/src/cli.c

@@ -118,7 +118,7 @@ static const struct sc_option options[] = {
         .longopt_id = OPT_AUDIO_CODEC,
         .longopt = "audio-codec",
         .argdesc = "name",
-        .text = "Select an audio codec (opus).\n"
+        .text = "Select an audio codec (opus or aac).\n"
                 "Default is opus.",
     },
     {
@@ -1459,6 +1459,10 @@ parse_audio_codec(const char *optarg, enum sc_codec *codec) {
         *codec = SC_CODEC_OPUS;
         return true;
     }
+    if (!strcmp(optarg, "aac")) {
+        *codec = SC_CODEC_AAC;
+        return true;
+    }
     LOGE("Unsupported audio codec: %s (expected opus)", optarg);
     return false;
 }

app/src/demuxer.c

@@ -24,6 +24,7 @@ sc_demuxer_to_avcodec_id(uint32_t codec_id) {
 #define SC_CODEC_ID_H265 UINT32_C(0x68323635) // "h265" in ASCII
 #define SC_CODEC_ID_AV1 UINT32_C(0x00617631) // "av1" in ASCII
 #define SC_CODEC_ID_OPUS UINT32_C(0x6f707573) // "opus" in ASCII
+#define SC_CODEC_ID_AAC UINT32_C(0x00616163) // "aac in ASCII"
     switch (codec_id) {
         case SC_CODEC_ID_H264:
             return AV_CODEC_ID_H264;
@@ -33,6 +34,8 @@ sc_demuxer_to_avcodec_id(uint32_t codec_id) {
             return AV_CODEC_ID_AV1;
         case SC_CODEC_ID_OPUS:
             return AV_CODEC_ID_OPUS;
+        case SC_CODEC_ID_AAC:
+            return AV_CODEC_ID_AAC;
         default:
             LOGE("Unknown codec id 0x%08" PRIx32, codec_id);
             return AV_CODEC_ID_NONE;

app/src/options.h

@@ -28,6 +28,7 @@ enum sc_codec {
     SC_CODEC_H265,
     SC_CODEC_AV1,
     SC_CODEC_OPUS,
+    SC_CODEC_AAC,
 };
 
 enum sc_lock_video_orientation {

app/src/server.c

@@ -167,6 +167,8 @@ sc_server_get_codec_name(enum sc_codec codec) {
             return "av1";
         case SC_CODEC_OPUS:
             return "opus";
+        case SC_CODEC_AAC:
+            return "aac";
         default:
             return NULL;
     }