dma: Add is_active method for input channels.

Since DBDMA contains an input and output channel, rename the existing is_active method to is_out_active.

devices/common/dbdma.cpp

@@ -429,7 +429,16 @@ int DMAChannel::push_data(const char* src_ptr, int len) {
     return 0;
 }
 
-bool DMAChannel::is_active() {
+bool DMAChannel::is_out_active() {
+    if (this->ch_stat & CH_STAT_DEAD || !(this->ch_stat & CH_STAT_ACTIVE)) {
+        return false;
+    }
+    else {
+        return true;
+    }
+}
+
+bool DMAChannel::is_in_active() {
     if (this->ch_stat & CH_STAT_DEAD || !(this->ch_stat & CH_STAT_ACTIVE)) {
         return false;
     }

devices/common/dbdma.h

@@ -92,7 +92,8 @@ public:
     uint32_t reg_read(uint32_t offset, int size);
     void reg_write(uint32_t offset, uint32_t value, int size);
 
-    bool            is_active();
+    bool            is_out_active();
+    bool            is_in_active();
     DmaPullResult   pull_data(uint32_t req_len, uint32_t *avail_len, uint8_t **p_data);
     int             push_data(const char* src_ptr, int len);
 

devices/common/dmacore.h

@@ -35,7 +35,7 @@ class DmaOutChannel {
 public:
     DmaOutChannel(std::string name) { this->name = name; };
 
-    virtual bool            is_active() { return true; };
+    virtual bool            is_out_active() { return true; };
     virtual DmaPullResult   pull_data(uint32_t req_len, uint32_t *avail_len,
                                       uint8_t **p_data) = 0;
 
@@ -49,7 +49,9 @@ class DmaInChannel {
 public:
     DmaInChannel(std::string name) { this->name = name; };
 
-    virtual int push_data(const char* src_ptr, int len) = 0;
+    virtual bool            is_in_active() { return true; };
+    virtual int             push_data(const char* src_ptr, int len) = 0;
+
     std::string get_name(void) { return this->name; };
 
 private:

devices/sound/soundserver_cubeb.cpp

@@ -108,7 +108,7 @@ long sound_out_callback(cubeb_stream *stream, void *user_data,
     long frames, out_frames;
     DmaOutChannel *dma_ch = static_cast<DmaOutChannel*>(user_data); /* C API baby! */
 
-    if (!dma_ch->is_active()) {
+    if (!dma_ch->is_out_active()) {
         return 0;
     }