X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fac3.h;h=9c822261071d745b6f5a07532f9858309d626901;hb=b07781b6e4f6267f20aec4e7f1d390ddb223af46;hp=e933f86884586aae7222557f42210f4bd29e0f9c;hpb=0c79b1402a48a99f32435a0f5ad2364c58c6fcf3;p=ffmpeg

diff --git a/libavcodec/ac3.h b/libavcodec/ac3.h
index e933f868845..9c822261071 100644
--- a/libavcodec/ac3.h
+++ b/libavcodec/ac3.h
@@ -1,6 +1,6 @@
 /*
- * Common code between AC3 encoder and decoder
- * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
+ * Common code between the AC-3 encoder and decoder
+ * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
  *
  * This file is part of FFmpeg.
  *
@@ -20,19 +20,19 @@
  */
 
 /**
- * @file ac3.h
- * Common code between AC3 encoder and decoder.
+ * @file libavcodec/ac3.h
+ * Common code between the AC-3 encoder and decoder.
  */
 
-#ifndef FFMPEG_AC3_H
-#define FFMPEG_AC3_H
+#ifndef AVCODEC_AC3_H
+#define AVCODEC_AC3_H
 
 #include "ac3tab.h"
 
 #define AC3_MAX_CODED_FRAME_SIZE 3840 /* in bytes */
 #define AC3_MAX_CHANNELS 6 /* including LFE channel */
 
-#define NB_BLOCKS 6 /* number of PCM blocks inside an AC3 frame */
+#define NB_BLOCKS 6 /* number of PCM blocks inside an AC-3 frame */
 #define AC3_FRAME_SIZE (NB_BLOCKS * 256)
 
 /* exponent encoding strategy */
@@ -85,6 +85,11 @@ typedef struct {
     uint8_t channel_mode;
     uint8_t lfe_on;
     uint8_t frame_type;
+    int substreamid;                        ///< substream identification
+    int center_mix_level;                   ///< Center mix level index
+    int surround_mix_level;                 ///< Surround mix level index
+    uint16_t channel_map;
+    int num_blocks;                         ///< number of audio blocks
     /** @} */
 
     /** @defgroup derived Derived values
@@ -95,9 +100,7 @@ typedef struct {
     uint32_t bit_rate;
     uint8_t channels;
     uint16_t frame_size;
-    int center_mix_level;                   ///< Center mix level index
-    int surround_mix_level;                 ///< Surround mix level index
-    uint16_t channel_map;
+    int64_t channel_layout;
     /** @} */
 } AC3HeaderInfo;
 
@@ -129,7 +132,7 @@ void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd,
 
 /**
  * Calculates the masking curve.
- * First, the excitation is calculated using parameters in \p s and the signal
+ * First, the excitation is calculated using parameters in s and the signal
  * power in each critical band.  The excitation is compared with a predefined
  * hearing threshold table to produce the masking curve.  If delta bit
  * allocation information is provided, it is used for adjusting the masking
@@ -147,17 +150,18 @@ void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd,
  * @param[in]  dba_lengths  length of each segment
  * @param[in]  dba_values   delta bit allocation for each segment
  * @param[out] mask         calculated masking curve
+ * @return returns 0 for success, non-zero for error
  */
-void ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
-                                int start, int end, int fast_gain, int is_lfe,
-                                int dba_mode, int dba_nsegs, uint8_t *dba_offsets,
-                                uint8_t *dba_lengths, uint8_t *dba_values,
-                                int16_t *mask);
+int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
+                               int start, int end, int fast_gain, int is_lfe,
+                               int dba_mode, int dba_nsegs, uint8_t *dba_offsets,
+                               uint8_t *dba_lengths, uint8_t *dba_values,
+                               int16_t *mask);
 
 /**
  * Calculates bit allocation pointers.
  * The SNR is the difference between the masking curve and the signal.  AC-3
- * uses this value for each frequency bin to allocate bits.  The \p snroffset
+ * uses this value for each frequency bin to allocate bits.  The snroffset
  * parameter is a global adjustment to the SNR for all bins.
  *
  * @param[in]  mask       masking curve
@@ -166,10 +170,12 @@ void ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
  * @param[in]  end        ending bin location
  * @param[in]  snr_offset SNR adjustment
  * @param[in]  floor      noise floor
+ * @param[in]  bap_tab    look-up table for bit allocation pointers
  * @param[out] bap        bit allocation pointers
  */
 void ff_ac3_bit_alloc_calc_bap(int16_t *mask, int16_t *psd, int start, int end,
-                               int snr_offset, int floor, uint8_t *bap);
+                               int snr_offset, int floor,
+                               const uint8_t *bap_tab, uint8_t *bap);
 
 void ac3_parametric_bit_allocation(AC3BitAllocParameters *s, uint8_t *bap,
                                    int8_t *exp, int start, int end,
@@ -178,4 +184,4 @@ void ac3_parametric_bit_allocation(AC3BitAllocParameters *s, uint8_t *bap,
                                    uint8_t *dba_offsets, uint8_t *dba_lengths,
                                    uint8_t *dba_values);
 
-#endif /* FFMPEG_AC3_H */
+#endif /* AVCODEC_AC3_H */