mxf: Support AAC

[ffmpeg] / libavcodec / ac3.h

diff --git a/libavcodec/ac3.h b/libavcodec/ac3.h
index 607baa5ad69ae4adcdc46a33d4f0c5be13f73901..f2cb6c39df5455151429ae2558a18d972b06ada7 100644 (file)
--- a/libavcodec/ac3.h
+++ b/libavcodec/ac3.h
@@ -28,7 +28,8 @@
 #define AVCODEC_AC3_H
 
 #define AC3_MAX_CODED_FRAME_SIZE 3840 /* in bytes */
-#define AC3_MAX_CHANNELS 6 /* including LFE channel */
+#define AC3_MAX_CHANNELS 7            /**< maximum number of channels, including coupling channel */
+#define CPL_CH 0                      /**< coupling channel index */
 
 #define AC3_MAX_COEFS   256
 #define AC3_BLOCK_SIZE  256
@@ -48,6 +49,17 @@
 #define EXP_D25   2
 #define EXP_D45   3
 
+/* pre-defined gain values */
+#define LEVEL_PLUS_3DB          1.4142135623730950
+#define LEVEL_PLUS_1POINT5DB    1.1892071150027209
+#define LEVEL_MINUS_1POINT5DB   0.8408964152537145
+#define LEVEL_MINUS_3DB         0.7071067811865476
+#define LEVEL_MINUS_4POINT5DB   0.5946035575013605
+#define LEVEL_MINUS_6DB         0.5000000000000000
+#define LEVEL_MINUS_9DB         0.3535533905932738
+#define LEVEL_ZERO              0.0000000000000000
+#define LEVEL_ONE               1.0000000000000000
+
 /** Delta bit allocation strategy */
 typedef enum {
     DBA_REUSE = 0,
@@ -68,6 +80,38 @@ typedef enum {
     AC3_CHMODE_3F2R
 } AC3ChannelMode;
 
+/** Dolby Surround mode */
+typedef enum AC3DolbySurroundMode {
+    AC3_DSURMOD_NOTINDICATED = 0,
+    AC3_DSURMOD_OFF,
+    AC3_DSURMOD_ON,
+    AC3_DSURMOD_RESERVED
+} AC3DolbySurroundMode;
+
+/** Dolby Surround EX mode */
+typedef enum AC3DolbySurroundEXMode {
+    AC3_DSUREXMOD_NOTINDICATED = 0,
+    AC3_DSUREXMOD_OFF,
+    AC3_DSUREXMOD_ON,
+    AC3_DSUREXMOD_PLIIZ
+} AC3DolbySurroundEXMode;
+
+/** Dolby Headphone mode */
+typedef enum AC3DolbyHeadphoneMode {
+    AC3_DHEADPHONMOD_NOTINDICATED = 0,
+    AC3_DHEADPHONMOD_OFF,
+    AC3_DHEADPHONMOD_ON,
+    AC3_DHEADPHONMOD_RESERVED
+} AC3DolbyHeadphoneMode;
+
+/** Preferred Stereo Downmix mode */
+typedef enum AC3PreferredStereoDownmixMode {
+    AC3_DMIXMOD_NOTINDICATED = 0,
+    AC3_DMIXMOD_LTRT,
+    AC3_DMIXMOD_LORO,
+    AC3_DMIXMOD_DPLII // reserved value in A/52, but used by encoders to indicate DPL2
+} AC3PreferredStereoDownmixMode;
+
 typedef struct AC3BitAllocParameters {
     int sr_code;
     int sr_shift;
@@ -79,14 +123,15 @@ typedef struct AC3BitAllocParameters {
  * @struct AC3HeaderInfo
  * Coded AC-3 header values up to the lfeon element, plus derived values.
  */
-typedef struct {
-    /** @defgroup coded Coded elements
+typedef struct AC3HeaderInfo {
+    /** @name Coded elements
      * @{
      */
     uint16_t sync_word;
     uint16_t crc1;
     uint8_t sr_code;
     uint8_t bitstream_id;
+    uint8_t bitstream_mode;
     uint8_t channel_mode;
     uint8_t lfe_on;
     uint8_t frame_type;
@@ -95,9 +140,10 @@ typedef struct {
     int surround_mix_level;                 ///< Surround mix level index
     uint16_t channel_map;
     int num_blocks;                         ///< number of audio blocks
+    int dolby_surround_mode;
     /** @} */
 
-    /** @defgroup derived Derived values
+    /** @name Derived values
      * @{
      */
     uint8_t sr_shift;
@@ -105,7 +151,7 @@ typedef struct {
     uint32_t bit_rate;
     uint8_t channels;
     uint16_t frame_size;
-    int64_t channel_layout;
+    uint64_t channel_layout;
     /** @} */
 } AC3HeaderInfo;
 
@@ -163,23 +209,4 @@ int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
                                uint8_t *dba_lengths, uint8_t *dba_values,
                                int16_t *mask);
 
-/**
- * Calculate 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 snroffset
- * parameter is a global adjustment to the SNR for all bins.
- *
- * @param[in]  mask       masking curve
- * @param[in]  psd        signal power for each frequency bin
- * @param[in]  start      starting bin location
- * @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,
-                               const uint8_t *bap_tab, uint8_t *bap);
-
 #endif /* AVCODEC_AC3_H */