decoder/flac: store the whole stream info object, not duration

We don't want to work with floating point values if possible.  Get the
integer number of frames from the FLAC__StreamMetadata_StreamInfo
object, and convert it into a float duration on demand.  This patch
adds a check if the STREAMINFO packet has been received yet.

src/decoder/_flac_common.c

@@ -35,6 +35,7 @@ flac_data_init(struct flac_data *data, struct decoder * decoder,
 {
 	pcm_buffer_init(&data->buffer);
 
+	data->have_stream_info = false;
 	data->next_frame = 0;
 
 	data->time = 0;
@@ -65,9 +66,11 @@ void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
 
 	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);
-		data->total_time = ((float)si->total_samples) / (si->sample_rate);
 		break;
 	case FLAC__METADATA_TYPE_VORBIS_COMMENT:
 		if (data->replay_gain_info)

src/decoder/_flac_common.h

@@ -38,6 +38,19 @@
 struct flac_data {
 	struct pcm_buffer buffer;
 
+	/**
+	 * Is the #stream_info member valid?
+	 */
+	bool have_stream_info;
+
+	/**
+	 * A copy of the stream info object passed to the metadata
+	 * callback.  Once we drop support for libFLAC 1.1.2, we can
+	 * remove this attribute, and use
+	 * FLAC__stream_decoder_get_total_samples() etc.
+	 */
+	FLAC__StreamMetadata_StreamInfo stream_info;
+
 	/**
 	 * The number of the next frame which is going to be decoded.
 	 */
@@ -46,7 +59,6 @@ struct flac_data {
 	float time;
 	unsigned int bit_rate;
 	struct audio_format audio_format;
-	float total_time;
 	FLAC__uint64 position;
 	struct decoder *decoder;
 	struct input_stream *input_stream;

src/decoder/flac_plugin.c

@@ -400,6 +400,11 @@ flac_decoder_initialize(struct flac_data *data, FLAC__StreamDecoder *sd,
 		return false;
 	}
 
+	if (!data->have_stream_info) {
+		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,
@@ -408,12 +413,13 @@ flac_decoder_initialize(struct flac_data *data, FLAC__StreamDecoder *sd,
 		return false;
 	}
 
-	if (duration != 0)
+	if (duration == 0)
-		data->total_time = (float)duration /
+		duration = data->stream_info.total_samples;
-			(float)data->audio_format.sample_rate;
 
 	decoder_initialized(data->decoder, &data->audio_format,
-			    seekable, data->total_time);
+			    seekable,
+			    (float)duration /
+			    (float)data->audio_format.sample_rate);
 	return true;
 }
 

src/decoder/oggflac_plugin.c

@@ -237,6 +237,12 @@ full_decoder_init_and_read_metadata(struct flac_data *data,
 		goto fail;
 	}
 
+	if (!data->have_stream_info) {
+		OggFLAC__seekable_stream_decoder_delete(decoder);
+		g_warning("no STREAMINFO packet found");
+		return NULL;
+	}
+
 	return decoder;
 
 fail:
@@ -316,7 +322,9 @@ oggflac_decode(struct decoder * mpd_decoder, struct input_stream *input_stream)
 	}
 
 	decoder_initialized(mpd_decoder, &data.audio_format,
-			    input_stream->seekable, data.total_time);
+			    input_stream->seekable,
+			    (float)data.stream_info.total_samples /
+			    (float)data.audio_format.sample_rate);
 
 	while (true) {
 		OggFLAC__seekable_stream_decoder_process_single(decoder);