/*
- * 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.
*
*/
/**
- * @file ac3.h
- * Common code between AC3 encoder and decoder.
+ * @file
+ * Common code between the AC-3 encoder and decoder.
*/
-#ifndef FFMPEG_AC3_H
-#define FFMPEG_AC3_H
-
-#include "ac3tab.h"
+#ifndef AVCODEC_AC3_H
+#define AVCODEC_AC3_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 AC3_FRAME_SIZE (NB_BLOCKS * 256)
+#define AC3_MAX_COEFS 256
+#define AC3_BLOCK_SIZE 256
+#define AC3_MAX_BLOCKS 6
+#define AC3_FRAME_SIZE (AC3_MAX_BLOCKS * 256)
+#define AC3_WINDOW_SIZE (AC3_BLOCK_SIZE * 2)
+#define AC3_CRITICAL_BANDS 50
+#define AC3_MAX_CPL_BANDS 18
+
+#include "libavutil/opt.h"
+#include "avcodec.h"
+#include "ac3tab.h"
/* exponent encoding strategy */
#define EXP_REUSE 0
#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,
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;
+ 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
uint32_t bit_rate;
uint8_t channels;
uint16_t frame_size;
+ int64_t channel_layout;
/** @} */
} AC3HeaderInfo;
EAC3_FRAME_TYPE_RESERVED
} EAC3FrameType;
-void ac3_common_init(void);
+/**
+ * Encoding Options used by AVOption.
+ */
+typedef struct AC3EncOptions {
+ /* AC-3 metadata options*/
+ int dialogue_level;
+ int bitstream_mode;
+ float center_mix_level;
+ float surround_mix_level;
+ int dolby_surround_mode;
+ int audio_production_info;
+ int mixing_level;
+ int room_type;
+ int copyright;
+ int original;
+ int extended_bsi_1;
+ int preferred_stereo_downmix;
+ float ltrt_center_mix_level;
+ float ltrt_surround_mix_level;
+ float loro_center_mix_level;
+ float loro_surround_mix_level;
+ int extended_bsi_2;
+ int dolby_surround_ex_mode;
+ int dolby_headphone_mode;
+ int ad_converter_type;
+
+ /* other encoding options */
+ int allow_per_frame_metadata;
+} AC3EncOptions;
+
+
+void ff_ac3_common_init(void);
+
+extern const int64_t ff_ac3_channel_layouts[];
+extern const AVOption ff_ac3_options[];
+
+extern AVCodec ff_ac3_float_encoder;
+extern AVCodec ff_ac3_fixed_encoder;
/**
- * Calculates the log power-spectral density of the input signal.
+ * Calculate the log power-spectral density of the input signal.
* This gives a rough estimate of signal power in the frequency domain by using
* the spectral envelope (exponents). The psd is also separately grouped
* into critical bands for use in the calculating the masking curve.
int16_t *band_psd);
/**
- * Calculates the masking curve.
- * First, the excitation is calculated using parameters in \p s and the signal
+ * Calculate the masking curve.
+ * 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
* @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);
-
-/**
- * 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
- * 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[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);
-
-void ac3_parametric_bit_allocation(AC3BitAllocParameters *s, uint8_t *bap,
- int8_t *exp, int start, int end,
- int snr_offset, int fast_gain, int is_lfe,
- int dba_mode, int dba_nsegs,
- uint8_t *dba_offsets, uint8_t *dba_lengths,
- uint8_t *dba_values);
+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);
-#endif /* FFMPEG_AC3_H */
+#endif /* AVCODEC_AC3_H */