decoder/flac: moved code to flac_data_get_audio_format()

Remove the audio_format attribute, add "frame_size" instead.  The
audio_format initialization and check is moved both to
flac_data_get_audio_format().

src/decoder/_flac_common.c

@@ -58,19 +58,41 @@ flac_data_deinit(struct flac_data *data)
 		tag_free(data->tag);
 }
 
+bool
+flac_data_get_audio_format(struct flac_data *data,
+			   struct audio_format *audio_format)
+{
+	if (!data->have_stream_info) {
+		g_warning("no STREAMINFO packet found");
+		return false;
+	}
+
+	audio_format_init(audio_format, data->stream_info.sample_rate,
+			  data->stream_info.bits_per_sample,
+			  data->stream_info.channels);
+
+	if (!audio_format_valid(audio_format)) {
+		g_warning("Invalid audio format: %u:%u:%u\n",
+			  audio_format->sample_rate,
+			  audio_format->bits,
+			  audio_format->channels);
+		return false;
+	}
+
+	data->frame_size = audio_format_frame_size(audio_format);
+
+	return true;
+}
+
 void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
 			     struct flac_data *data)
 {
-	const FLAC__StreamMetadata_StreamInfo *si = &(block->data.stream_info);
-
 	switch (block->type) {
 	case FLAC__METADATA_TYPE_STREAMINFO:
 		data->stream_info = block->data.stream_info;
 		data->have_stream_info = true;
-
-		audio_format_init(&data->audio_format, si->sample_rate,
-				  si->bits_per_sample, si->channels);
 		break;
+
 	case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 		if (data->replay_gain_info)
 			replay_gain_info_free(data->replay_gain_info);
@@ -113,8 +135,7 @@ flac_common_write(struct flac_data *data, const FLAC__Frame * frame,
 		  FLAC__uint64 nbytes)
 {
 	enum decoder_command cmd;
-	size_t buffer_size = frame->header.blocksize *
+	size_t buffer_size = frame->header.blocksize * data->frame_size;
-		audio_format_frame_size(&data->audio_format);
 	void *buffer;
 	float position;
 	unsigned bit_rate;

src/decoder/_flac_common.h

@@ -38,6 +38,11 @@
 struct flac_data {
 	struct pcm_buffer buffer;
 
+	/**
+	 * The size of one frame in the output buffer.
+	 */
+	unsigned frame_size;
+
 	/**
 	 * Is the #stream_info member valid?
 	 */
@@ -62,7 +67,6 @@ struct flac_data {
 	 */
 	FLAC__uint64 next_frame;
 
-	struct audio_format audio_format;
 	FLAC__uint64 position;
 	struct decoder *decoder;
 	struct input_stream *input_stream;
@@ -78,6 +82,17 @@ 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_plugin.c

@@ -391,28 +391,20 @@ static bool
 flac_decoder_initialize(struct flac_data *data, FLAC__StreamDecoder *sd,
 			bool seekable, FLAC__uint64 duration)
 {
+	struct audio_format audio_format;
+
 	if (!FLAC__stream_decoder_process_until_end_of_metadata(sd)) {
 		g_warning("problem reading metadata");
 		return false;
 	}
 
-	if (!data->have_stream_info) {
+	if (!flac_data_get_audio_format(data, &audio_format))
-		g_warning("no STREAMINFO packet found");
 		return false;
-	}
-
-	if (!audio_format_valid(&data->audio_format)) {
-		g_warning("Invalid audio format: %u:%u:%u\n",
-			  data->audio_format.sample_rate,
-			  data->audio_format.bits,
-			  data->audio_format.channels);
-		return false;
-	}
 
 	if (duration == 0)
 		duration = data->stream_info.total_samples;
 
-	decoder_initialized(data->decoder, &data->audio_format,
+	decoder_initialized(data->decoder, &audio_format,
 			    seekable,
 			    (float)duration /
 			    (float)data->stream_info.sample_rate);

src/decoder/oggflac_plugin.c

@@ -288,6 +288,7 @@ oggflac_decode(struct decoder * mpd_decoder, struct input_stream *input_stream)
 {
 	OggFLAC__SeekableStreamDecoder *decoder = NULL;
 	struct flac_data data;
+	struct audio_format audio_format;
 
 	if (ogg_stream_type_detect(input_stream) != FLAC)
 		return;
@@ -302,20 +303,10 @@ oggflac_decode(struct decoder * mpd_decoder, struct input_stream *input_stream)
 		goto fail;
 	}
 
-	if (!data.have_stream_info) {
+	if (!flac_data_get_audio_format(&data, &audio_format))
-		g_warning("no STREAMINFO packet found");
 		goto fail;
-	}
 
-	if (!audio_format_valid(&data.audio_format)) {
+	decoder_initialized(mpd_decoder, &audio_format,
-		g_warning("Invalid audio format: %u:%u:%u\n",
-			  data.audio_format.sample_rate,
-			  data.audio_format.bits,
-			  data.audio_format.channels);
-		goto fail;
-	}
-
-	decoder_initialized(mpd_decoder, &data.audio_format,
 			    input_stream->seekable,
 			    (float)data.stream_info.total_samples /
 			    (float)data.stream_info.sample_rate);