Add option to select audio codec

Introduce the selection mechanism. Alternative codecs will be added
later.

app/scrcpy.1

@@ -25,6 +25,12 @@ Encode the audio at the given bit\-rate, expressed in bits/s. Unit suffixes are
 
 Default is 196K (196000).
 
+.TP
+.BI "\-\-audio\-codec " name
+Select an audio codec (opus).
+
+Default is opus.
+
 .TP
 .BI "\-b, \-\-bit\-rate " value
 Encode the video at the given bit\-rate, expressed in bits/s. Unit suffixes are supported: '\fBK\fR' (x1000) and '\fBM\fR' (x1000000).

app/src/cli.c

@@ -60,6 +60,7 @@
 #define OPT_CODEC                  1040
 #define OPT_NO_AUDIO               1041
 #define OPT_AUDIO_BIT_RATE         1042
+#define OPT_AUDIO_CODEC            1043
 
 struct sc_option {
     char shortopt;
@@ -108,6 +109,13 @@ static const struct sc_option options[] = {
                 "Unit suffixes are supported: 'K' (x1000) and 'M' (x1000000).\n"
                 "Default is 196K (196000).",
     },
+    {
+        .longopt_id = OPT_AUDIO_CODEC,
+        .longopt = "audio-codec",
+        .argdesc = "name",
+        .text = "Select an audio codec (opus).\n"
+                "Default is opus.",
+    },
     {
         .shortopt = 'b',
         .longopt = "bit-rate",
@@ -1418,6 +1426,16 @@ parse_codec(const char *optarg, enum sc_codec *codec) {
     return false;
 }
 
+static bool
+parse_audio_codec(const char *optarg, enum sc_codec *codec) {
+    if (!strcmp(optarg, "opus")) {
+        *codec = SC_CODEC_OPUS;
+        return true;
+    }
+    LOGE("Unsupported audio codec: %s (expected opus)", optarg);
+    return false;
+}
+
 static bool
 parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
                        const char *optstring, const struct option *longopts) {
@@ -1664,6 +1682,11 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
                     return false;
                 }
                 break;
+            case OPT_AUDIO_CODEC:
+                if (!parse_audio_codec(optarg, &opts->audio_codec)) {
+                    return false;
+                }
+                break;
             case OPT_OTG:
 #ifdef HAVE_USB
                 opts->otg = true;

app/src/options.c

@@ -14,6 +14,7 @@ const struct scrcpy_options scrcpy_options_default = {
 #endif
     .log_level = SC_LOG_LEVEL_INFO,
     .codec = SC_CODEC_H264,
+    .audio_codec = SC_CODEC_OPUS,
     .record_format = SC_RECORD_FORMAT_AUTO,
     .keyboard_input_mode = SC_KEYBOARD_INPUT_MODE_INJECT,
     .port_range = {

app/src/options.h

@@ -27,6 +27,7 @@ enum sc_codec {
     SC_CODEC_H264,
     SC_CODEC_H265,
     SC_CODEC_AV1,
+    SC_CODEC_OPUS,
 };
 
 enum sc_lock_video_orientation {
@@ -100,6 +101,7 @@ struct scrcpy_options {
 #endif
     enum sc_log_level log_level;
     enum sc_codec codec;
+    enum sc_codec audio_codec;
     enum sc_record_format record_format;
     enum sc_keyboard_input_mode keyboard_input_mode;
     enum sc_mouse_input_mode mouse_input_mode;

app/src/scrcpy.c

@@ -351,6 +351,7 @@ scrcpy(struct scrcpy_options *options) {
         .select_tcpip = options->select_tcpip,
         .log_level = options->log_level,
         .codec = options->codec,
+        .audio_codec = options->audio_codec,
         .crop = options->crop,
         .port_range = options->port_range,
         .tunnel_host = options->tunnel_host,

app/src/server.c

@@ -165,6 +165,8 @@ sc_server_get_codec_name(enum sc_codec codec) {
             return "h265";
         case SC_CODEC_AV1:
             return "av1";
+        case SC_CODEC_OPUS:
+            return "opus";
         default:
             return NULL;
     }
@@ -227,6 +229,10 @@ execute_server(struct sc_server *server,
     if (params->codec != SC_CODEC_H264) {
         ADD_PARAM("codec=%s", sc_server_get_codec_name(params->codec));
     }
+    if (params->audio_codec != SC_CODEC_OPUS) {
+        ADD_PARAM("audio_codec=%s",
+            sc_server_get_codec_name(params->audio_codec));
+    }
     if (params->max_size) {
         ADD_PARAM("max_size=%" PRIu16, params->max_size);
     }

app/src/server.h

@@ -26,6 +26,7 @@ struct sc_server_params {
     const char *req_serial;
     enum sc_log_level log_level;
     enum sc_codec codec;
+    enum sc_codec audio_codec;
     const char *crop;
     const char *codec_options;
     const char *encoder_name;