basic type mechanism working

1 files changed, 65 insertions, 4 deletions

diff --git a/ffmpeg/libavcodec/atrac.h b/ffmpeg/libavcodec/atrac.h
index 8607b01..05208bb 100644
--- a/ffmpeg/libavcodec/atrac.h
+++ b/ffmpeg/libavcodec/atrac.h
@@ -1,6 +1,7 @@
 /*
- * Atrac common data
- * Copyright (c) 2009 Maxim Poliakovski
+ * common functions for the ATRAC family of decoders
+ *
+ * Copyright (c) 2009-2013 Maxim Poliakovski
  * Copyright (c) 2009 Benjamin Larsson
  *
  * This file is part of FFmpeg.
@@ -22,15 +23,75 @@
 
 /**
  * @file
- * Atrac common header
+ * ATRAC common header
  */
 
 #ifndef AVCODEC_ATRAC_H
 #define AVCODEC_ATRAC_H
 
+/**
+ *  Gain control parameters for one subband.
+ */
+typedef struct AtracGainInfo {
+    int   num_points;   ///< number of gain control points
+    int   lev_code[7];  ///< level at corresponding control point
+    int   loc_code[7];  ///< location of gain control points
+} AtracGainInfo;
+
+/**
+ *  Gain compensation context structure.
+ */
+typedef struct AtracGCContext {
+    float   gain_tab1[16];  ///< gain compensation level table
+    float   gain_tab2[31];  ///< gain compensation interpolation table
+    int     id2exp_offset;  ///< offset for converting level index into level exponent
+    int     loc_scale;      ///< scale of location code = 2^loc_scale samples
+    int     loc_size;       ///< size of location code in samples
+} AtracGCContext;
+
 extern float ff_atrac_sf_table[64];
 
+/**
+ * Generate common tables.
+ */
 void ff_atrac_generate_tables(void);
-void ff_atrac_iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp);
+
+/**
+ *  Initialize gain compensation context.
+ *
+ * @param gctx            pointer to gain compensation context to initialize
+ * @param id2exp_offset   offset for converting level index into level exponent
+ * @param loc_scale       location size factor
+ */
+void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset,
+                                     int loc_scale);
+
+/**
+ * Apply gain compensation and perform the MDCT overlapping part.
+ *
+ * @param gctx         pointer to gain compensation context
+ * @param in           input buffer
+ * @param prev         previous buffer to perform overlap against
+ * @param gc_now       gain control information for current frame
+ * @param gc_next      gain control information for next frame
+ * @param num_samples  number of samples to process
+ * @param out          output data goes here
+ */
+void ff_atrac_gain_compensation(AtracGCContext *gctx, float *in, float *prev,
+                                AtracGainInfo *gc_now, AtracGainInfo *gc_next,
+                                int num_samples, float *out);
+
+/**
+ * Quadrature mirror synthesis filter.
+ *
+ * @param inlo      lower part of spectrum
+ * @param inhi      higher part of spectrum
+ * @param nIn       size of spectrum buffer
+ * @param pOut      out buffer
+ * @param delayBuf  delayBuf buffer
+ * @param temp      temp buffer
+ */
+void ff_atrac_iqmf(float *inlo, float *inhi, unsigned int nIn, float *pOut,
+                   float *delayBuf, float *temp);
 
 #endif /* AVCODEC_ATRAC_H */