From b91d46614df189e7905538e7f5c4ed9c7ed0d274 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Tue, 11 May 2010 19:52:42 +0000
Subject: float based mp1/mp2/mp3 decoders.

Originally committed as revision 23095 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/mpegaudio.h | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

(limited to 'libavcodec/mpegaudio.h')

diff --git a/libavcodec/mpegaudio.h b/libavcodec/mpegaudio.h
index 26ec2bebc1..53d82da4e3 100644
--- a/libavcodec/mpegaudio.h
+++ b/libavcodec/mpegaudio.h
@@ -26,6 +26,10 @@
 #ifndef AVCODEC_MPEGAUDIO_H
 #define AVCODEC_MPEGAUDIO_H
 
+#ifndef CONFIG_FLOAT
+#   define CONFIG_FLOAT 0
+#endif
+
 #include "avcodec.h"
 #include "get_bits.h"
 #include "dsputil.h"
@@ -65,7 +69,10 @@
 
 #define FIX(a)   ((int)((a) * FRAC_ONE))
 
-#if CONFIG_MPEGAUDIO_HP && CONFIG_AUDIO_NONSHORT
+#if CONFIG_FLOAT
+typedef float OUT_INT;
+#define OUT_FMT SAMPLE_FMT_FLT
+#elif CONFIG_MPEGAUDIO_HP && CONFIG_AUDIO_NONSHORT
 typedef int32_t OUT_INT;
 #define OUT_MAX INT32_MAX
 #define OUT_MIN INT32_MIN
@@ -79,9 +86,14 @@ typedef int16_t OUT_INT;
 #define OUT_FMT SAMPLE_FMT_S16
 #endif
 
-#if FRAC_BITS <= 15
+#if CONFIG_FLOAT
+#   define INTFLOAT float
+typedef float MPA_INT;
+#elif FRAC_BITS <= 15
+#   define INTFLOAT int
 typedef int16_t MPA_INT;
 #else
+#   define INTFLOAT int
 typedef int32_t MPA_INT;
 #endif
 
@@ -105,7 +117,7 @@ typedef struct GranuleDef {
     int preflag;
     int short_start, long_end; /* long/short band indexes */
     uint8_t scale_factors[40];
-    int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
+    INTFLOAT sb_hybrid[SBLIMIT * 18]; /* 576 samples */
 } GranuleDef;
 
 #define MPA_DECODE_HEADER \
@@ -134,13 +146,12 @@ typedef struct MPADecodeContext {
     GetBitContext in_gb;
     DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512 * 2];
     int synth_buf_offset[MPA_MAX_CHANNELS];
-    DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
-    int32_t mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
+    DECLARE_ALIGNED(16, INTFLOAT, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
+    INTFLOAT mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
     GranuleDef granules[2][2]; /* Used in Layer 3 */
 #ifdef DEBUG
     int frame_count;
 #endif
-    void (*compute_antialias)(struct MPADecodeContext *s, struct GranuleDef *g);
     int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3
     int dither_state;
     int error_recognition;
@@ -161,7 +172,13 @@ void ff_mpa_synth_init(MPA_INT *window);
 void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
                          MPA_INT *window, int *dither_state,
                          OUT_INT *samples, int incr,
-                         int32_t sb_samples[SBLIMIT]);
+                         INTFLOAT sb_samples[SBLIMIT]);
+
+void ff_mpa_synth_init_float(MPA_INT *window);
+void ff_mpa_synth_filter_float(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
+                         MPA_INT *window, int *dither_state,
+                         OUT_INT *samples, int incr,
+                         INTFLOAT sb_samples[SBLIMIT]);
 
 /* fast header check for resync */
 static inline int ff_mpa_check_header(uint32_t header){
-- 
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