Add two error statuses to the stream decoder for broken files (#744)

include/FLAC/stream_decoder.h

@@ -455,9 +455,21 @@ typedef enum {
 	FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM,
 	/**< The decoder encountered reserved fields in use in the stream. */
 
-	FLAC__STREAM_DECODER_ERROR_STATUS_BAD_METADATA
+	FLAC__STREAM_DECODER_ERROR_STATUS_BAD_METADATA,
 	/**< The decoder encountered a corrupted metadata block. */
 
+	FLAC__STREAM_DECODER_ERROR_STATUS_OUT_OF_BOUNDS,
+	/**< The decoder encountered a otherwise valid frame in which
+	 *   the decoded samples exceeded the range offered by the stated
+	 *   bit depth. */
+
+	FLAC__STREAM_DECODER_ERROR_STATUS_MISSING_FRAME
+	/**< Two adjacent frames had frame numbers increasing by more than
+	 *   1 or sample numbers increasing by more than the blocksize,
+	 *   indicating that one or more frame/frames was missing between
+	 *   them. The decoder will sent out one or more ´fake' constant
+	 *   subframes to fill up the gap.  */
+
 } FLAC__StreamDecoderErrorStatus;
 
 /** Maps a FLAC__StreamDecoderErrorStatus to a C string.

src/libFLAC/stream_decoder.c

@@ -236,7 +236,9 @@ FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
 	"FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
 	"FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH",
 	"FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM",
-	"FLAC__STREAM_DECODER_ERROR_STATUS_BAD_METADATA"
+	"FLAC__STREAM_DECODER_ERROR_STATUS_BAD_METADATA",
+	"FLAC__STREAM_DECODER_ERROR_STATUS_OUT_OF_BOUNDS",
+	"FLAC__STREAM_DECODER_ERROR_STATUS_MISSING_FRAME"
 };
 
 /***********************************************************************
@@ -2282,7 +2284,7 @@ FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FL
 					if((decoder->private_->output[channel][i] < (INT32_MIN >> shift_bits)) ||
 					   (decoder->private_->output[channel][i] > (INT32_MAX >> shift_bits))) {
 						/* Bad frame, emit error */
-						send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
+						send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_OUT_OF_BOUNDS);
 						decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 						break;
 					}
@@ -2309,7 +2311,7 @@ FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FL
 			 * frames are missing, and the frames before and after it
 			 * are complete */
 			if(!decoder->private_->error_has_been_sent)
-				send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
+				send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_MISSING_FRAME);
 			/* Do some extra validation to assure last frame an current frame
 			 * header are both valid before adding silence inbetween
 			 * Technically both frames could be valid with differing sample_rates,