decoder/flac: moved decoder initialization to _flac_common.c

Invoke decoder_initialized() in the libFLAC metadata callback.  This
merges code from the FLAC and the OggFLAC decoder plugin into the
common library.

src/decoder/_flac_common.c

@@ -38,7 +38,8 @@ flac_data_init(struct flac_data *data, struct decoder * decoder,
 	pcm_buffer_init(&data->buffer);
 
 	data->unsupported = false;
-	data->have_stream_info = false;
+	data->initialized = false;
+	data->total_frames = 0;
 	data->first_frame = 0;
 	data->next_frame = 0;
 
@@ -78,27 +79,11 @@ flac_sample_format(const FLAC__StreamMetadata_StreamInfo *si)
 	}
 }
 
-bool
-flac_data_get_audio_format(struct flac_data *data,
-			   struct audio_format *audio_format)
-{
-	if (data->unsupported)
-		return false;
-
-	if (!data->have_stream_info) {
-		g_warning("no STREAMINFO packet found");
-		return false;
-	}
-
-	*audio_format = data->audio_format;
-	return true;
-}
-
 static void
 flac_got_stream_info(struct flac_data *data,
 		     const FLAC__StreamMetadata_StreamInfo *stream_info)
 {
-	if (data->have_stream_info || data->unsupported)
+	if (data->initialized || data->unsupported)
 		return;
 
 	GError *error = NULL;
@@ -114,8 +99,15 @@ flac_got_stream_info(struct flac_data *data,
 
 	data->frame_size = audio_format_frame_size(&data->audio_format);
 
+	if (data->total_frames == 0)
 		data->total_frames = stream_info->total_samples;
-	data->have_stream_info = true;
+
+	decoder_initialized(data->decoder, &data->audio_format,
+			    data->input_stream->seekable,
+			    (float)data->total_frames /
+			    (float)data->audio_format.sample_rate);
+
+	data->initialized = true;
 }
 
 void flac_metadata_common_cb(const FLAC__StreamMetadata * block,

src/decoder/_flac_common.h

@@ -44,9 +44,9 @@ struct flac_data {
 	unsigned frame_size;
 
 	/**
-	 * Is the #stream_info member valid?
+	 * Has decoder_initialized() been called yet?
 	 */
-	bool have_stream_info;
+	bool initialized;
 
 	/**
 	 * Does the FLAC file contain an unsupported audio format?
@@ -55,12 +55,14 @@ struct flac_data {
 
 	/**
 	 * The validated audio format of the FLAC file.  This
-	 * attribute is defined if "have_stream_info" is true.
+	 * attribute is defined if "initialized" is true.
 	 */
 	struct audio_format audio_format;
 
 	/**
-	 * The total number of frames in this song.
+	 * The total number of frames in this song.  The decoder
+	 * plugin may initialize this attribute to override the value
+	 * provided by libFLAC (e.g. for sub songs from a CUE sheet).
 	 */
 	FLAC__uint64 total_frames;
 
@@ -89,17 +91,6 @@ flac_data_init(struct flac_data *data, struct decoder * decoder,
 void
 flac_data_deinit(struct flac_data *data);
 
-/**
- * Obtains the audio format from the stream_info attribute, and copies
- * it to the specified #audio_format object.  This also updates the
- * frame_size attribute.
- *
- * @return true on success, false the audio format is not supported
- */
-bool
-flac_data_get_audio_format(struct flac_data *data,
-			   struct audio_format *audio_format);
-
 void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
 			     struct flac_data *data);
 

src/decoder/flac_decoder_plugin.c

@@ -238,26 +238,16 @@ flac_decoder_new(void)
 
 static bool
 flac_decoder_initialize(struct flac_data *data, FLAC__StreamDecoder *sd,
-			bool seekable, FLAC__uint64 duration)
+			FLAC__uint64 duration)
 {
-	struct audio_format audio_format;
+	data->total_frames = duration;
 
 	if (!FLAC__stream_decoder_process_until_end_of_metadata(sd)) {
 		g_warning("problem reading metadata");
 		return false;
 	}
 
-	if (!flac_data_get_audio_format(data, &audio_format))
-		return false;
-
-	if (duration == 0)
-		duration = data->total_frames;
-
-	decoder_initialized(data->decoder, &audio_format,
-			    seekable,
-			    (float)duration /
-			    (float)data->audio_format.sample_rate);
-	return true;
+	return data->initialized;
 }
 
 static void
@@ -365,8 +355,7 @@ flac_decode_internal(struct decoder * decoder,
 		}
 	}
 
-	if (!flac_decoder_initialize(&data, flac_dec,
-				     input_stream->seekable, 0)) {
+	if (!flac_decoder_initialize(&data, flac_dec, 0)) {
 		flac_data_deinit(&data);
 		FLAC__stream_decoder_delete(flac_dec);
 		return;

src/decoder/oggflac_decoder_plugin.c

@@ -297,7 +297,7 @@ oggflac_decode(struct decoder * mpd_decoder, struct input_stream *input_stream)
 		goto fail;
 	}
 
-	if (!flac_data_get_audio_format(&data, &audio_format))
+	if (!data.initialized)
 		goto fail;
 
 	decoder_initialized(mpd_decoder, &audio_format,