From 9df24ac202149214a170e105604a35e04e65be15 Mon Sep 17 00:00:00 2001
From: Martijn van Beurden <mvanb1@gmail.com>
Date: Fri, 1 Apr 2022 21:25:51 +0200
Subject: Add 32-bit decoding capability

Decoding for 32-bit files is added, including the ability to decode
a 33-bit side subframe. However, residuals are assumed to be limited
to a 32-bit signed int, the encoder must make sure of this
---
 include/FLAC/format.h | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

(limited to 'include/FLAC/format.h')

diff --git a/include/FLAC/format.h b/include/FLAC/format.h
index cf5c25aa..28eda599 100644
--- a/include/FLAC/format.h
+++ b/include/FLAC/format.h
@@ -282,14 +282,24 @@ extern FLAC_API const char * const FLAC__SubframeTypeString[];
 /** CONSTANT subframe.  (c.f. <A HREF="../format.html#subframe_constant">format specification</A>)
  */
 typedef struct {
-	FLAC__int32 value; /**< The constant signal value. */
+	FLAC__int64 value; /**< The constant signal value. */
 } FLAC__Subframe_Constant;
 
+/** An enumeration of the possible verbatim subframe data types. */
+typedef enum {
+	FLAC__VERBATIM_SUBFRAME_DATA_TYPE_INT32, /**< verbatim subframe has 32-bit int */
+	FLAC__VERBATIM_SUBFRAME_DATA_TYPE_INT64 /**< verbatim subframe has 64-bit int */
+} FLAC__VerbatimSubframeDataType;
+
 
 /** VERBATIM subframe.  (c.f. <A HREF="../format.html#subframe_verbatim">format specification</A>)
  */
 typedef struct {
-	const FLAC__int32 *data; /**< A pointer to verbatim signal. */
+	union {
+		const FLAC__int32 *int32; /**< A FLAC__int32 pointer to verbatim signal. */
+		const FLAC__int64 *int64; /**< A FLAC__int64 pointer to verbatim signal. */
+	} data;
+	FLAC__VerbatimSubframeDataType data_type;
 } FLAC__Subframe_Verbatim;
 
 
@@ -302,7 +312,7 @@ typedef struct {
 	uint32_t order;
 	/**< The polynomial order. */
 
-	FLAC__int32 warmup[FLAC__MAX_FIXED_ORDER];
+	FLAC__int64 warmup[FLAC__MAX_FIXED_ORDER];
 	/**< Warmup samples to prime the predictor, length == order. */
 
 	const FLAC__int32 *residual;
@@ -328,7 +338,7 @@ typedef struct {
 	FLAC__int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
 	/**< FIR filter coefficients. */
 
-	FLAC__int32 warmup[FLAC__MAX_LPC_ORDER];
+	FLAC__int64 warmup[FLAC__MAX_LPC_ORDER];
 	/**< Warmup samples to prime the predictor, length == order. */
 
 	const FLAC__int32 *residual;
-- 
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