Add --audio-codec=raw option

Add support for raw (PCM S16 LE) audio codec (a raw decoder is included
in FFmpeg).

PR #3757 <https://github.com/Genymobile/scrcpy/pull/3757>

app/data/bash-completion/scrcpy

@@ -78,7 +78,7 @@ _scrcpy() {
             return
             ;;
         --audio-codec)
-            COMPREPLY=($(compgen -W 'opus aac' -- "$cur"))
+            COMPREPLY=($(compgen -W 'opus aac raw' -- "$cur"))
             return
             ;;
         --lock-video-orientation)

app/data/zsh-completion/_scrcpy

@@ -10,7 +10,7 @@ local arguments
 arguments=(
     '--always-on-top[Make scrcpy window always on top \(above other windows\)]'
     '--audio-bit-rate=[Encode the audio at the given bit-rate]'
-    '--audio-codec=[Select the audio codec]:codec:(opus aac)'
+    '--audio-codec=[Select the audio codec]:codec:(opus aac raw)'
     '--audio-codec-options=[Set a list of comma-separated key\:type=value options for the device audio encoder]'
     '--audio-encoder=[Use a specific MediaCodec audio encoder]'
     {-b,--video-bit-rate=}'[Encode the video at the given bit-rate]'

app/scrcpy.1

@@ -35,7 +35,7 @@ Default is 50.
 
 .TP
 .BI "\-\-audio\-codec " name
-Select an audio codec (opus or aac).
+Select an audio codec (opus, aac or raw).
 
 Default is opus.
 

app/src/cli.c

@@ -134,7 +134,7 @@ static const struct sc_option options[] = {
         .longopt_id = OPT_AUDIO_CODEC,
         .longopt = "audio-codec",
         .argdesc = "name",
-        .text = "Select an audio codec (opus or aac).\n"
+        .text = "Select an audio codec (opus, aac or raw).\n"
                 "Default is opus.",
     },
     {
@@ -1522,7 +1522,11 @@ parse_audio_codec(const char *optarg, enum sc_codec *codec) {
         *codec = SC_CODEC_AAC;
         return true;
     }
-    LOGE("Unsupported audio codec: %s (expected opus or aac)", optarg);
+    if (!strcmp(optarg, "raw")) {
+        *codec = SC_CODEC_RAW;
+        return true;
+    }
+    LOGE("Unsupported audio codec: %s (expected opus, aac or raw)", optarg);
     return false;
 }
 
@@ -1923,6 +1927,11 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
         }
     }
 
+    if (opts->record_filename && opts->audio_codec == SC_CODEC_RAW) {
+        LOGW("Recording does not support RAW audio codec");
+        return false;
+    }
+
     if (!opts->control) {
         if (opts->turn_screen_off) {
             LOGE("Could not request to turn screen off if control is disabled");

app/src/demuxer.c

@@ -25,6 +25,7 @@ sc_demuxer_to_avcodec_id(uint32_t codec_id) {
 #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"
+#define SC_CODEC_ID_RAW UINT32_C(0x00726177) // "raw" in ASCII
     switch (codec_id) {
         case SC_CODEC_ID_H264:
             return AV_CODEC_ID_H264;
@@ -36,6 +37,8 @@ sc_demuxer_to_avcodec_id(uint32_t codec_id) {
             return AV_CODEC_ID_OPUS;
         case SC_CODEC_ID_AAC:
             return AV_CODEC_ID_AAC;
+        case SC_CODEC_ID_RAW:
+            return AV_CODEC_ID_PCM_S16LE;
         default:
             LOGE("Unknown codec id 0x%08" PRIx32, codec_id);
             return AV_CODEC_ID_NONE;

app/src/options.h

@@ -29,6 +29,7 @@ enum sc_codec {
     SC_CODEC_AV1,
     SC_CODEC_OPUS,
     SC_CODEC_AAC,
+    SC_CODEC_RAW,
 };
 
 enum sc_lock_video_orientation {

app/src/server.c

@@ -173,6 +173,8 @@ sc_server_get_codec_name(enum sc_codec codec) {
             return "opus";
         case SC_CODEC_AAC:
             return "aac";
+        case SC_CODEC_RAW:
+            return "raw";
         default:
             return NULL;
     }