Privatize recorder threading

The fact that the recorder uses a separate thread is an internal detail,
so the functions _start(), _stop() and _join() should not be exposed.

Instead, start the thread on _open() and _stop()+_join() on close().

This paves the way to expose the recorder as a packet sink trait.

app/src/recorder.c

@@ -259,42 +259,32 @@ recorder_open(struct recorder *recorder, const AVCodec *input_codec) {
         return false;
     }
 
-    LOGI("Recording started to %s file: %s", format_name, recorder->filename);
-
-    return true;
-}
-
-void
-recorder_close(struct recorder *recorder) {
-    avio_close(recorder->ctx->pb);
-    avformat_free_context(recorder->ctx);
-}
-
-bool
-recorder_start(struct recorder *recorder) {
     LOGD("Starting recorder thread");
-
     bool ok = sc_thread_create(&recorder->thread, run_recorder, "recorder",
                                recorder);
     if (!ok) {
         LOGC("Could not start recorder thread");
+        avio_close(recorder->ctx->pb);
+        avformat_free_context(recorder->ctx);
         return false;
     }
 
+    LOGI("Recording started to %s file: %s", format_name, recorder->filename);
+
     return true;
 }
 
 void
-recorder_stop(struct recorder *recorder) {
+recorder_close(struct recorder *recorder) {
     sc_mutex_lock(&recorder->mutex);
     recorder->stopped = true;
     sc_cond_signal(&recorder->queue_cond);
     sc_mutex_unlock(&recorder->mutex);
-}
 
-void
-recorder_join(struct recorder *recorder) {
     sc_thread_join(&recorder->thread, NULL);
+
+    avio_close(recorder->ctx->pb);
+    avformat_free_context(recorder->ctx);
 }
 
 bool

app/src/recorder.h

@@ -28,7 +28,7 @@ struct recorder {
     sc_thread thread;
     sc_mutex mutex;
     sc_cond queue_cond;
-    bool stopped; // set on recorder_stop() by the stream reader
+    bool stopped; // set on recorder_close()
     bool failed; // set on packet write failure
     struct recorder_queue queue;
 
@@ -52,15 +52,6 @@ recorder_open(struct recorder *recorder, const AVCodec *input_codec);
 void
 recorder_close(struct recorder *recorder);
 
-bool
-recorder_start(struct recorder *recorder);
-
-void
-recorder_stop(struct recorder *recorder);
-
-void
-recorder_join(struct recorder *recorder);
-
 bool
 recorder_push(struct recorder *recorder, const AVPacket *packet);
 

app/src/stream.c

@@ -203,17 +203,12 @@ run_stream(void *data) {
             LOGE("Could not open recorder");
             goto finally_close_decoder;
         }
-
-        if (!recorder_start(stream->recorder)) {
-            LOGE("Could not start recorder");
-            goto finally_close_recorder;
-        }
     }
 
     stream->parser = av_parser_init(AV_CODEC_ID_H264);
     if (!stream->parser) {
         LOGE("Could not initialize parser");
-        goto finally_stop_and_join_recorder;
+        goto finally_close_recorder;
     }
 
     // We must only pass complete frames to av_parser_parse2()!
@@ -243,12 +238,6 @@ run_stream(void *data) {
     }
 
     av_parser_close(stream->parser);
-finally_stop_and_join_recorder:
-    if (stream->recorder) {
-        recorder_stop(stream->recorder);
-        LOGI("Finishing recording...");
-        recorder_join(stream->recorder);
-    }
 finally_close_recorder:
     if (stream->recorder) {
         recorder_close(stream->recorder);