ac3enc: doxygen update.

Add some parameters to existing function documentation.
Remove some unneeded documentation.
Convert some static function documentation to non-doxygen style.

libavcodec/ac3enc.c

@@ -176,6 +176,8 @@ static const int8_t ac3_coupling_start_tab[6][3][19] = {
 /**
  * Adjust the frame size to make the average bit rate match the target bit rate.
  * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3.
+ *
+ * @param s  AC-3 encoder private context
  */
 void ff_ac3_adjust_frame_size(AC3EncodeContext *s)
 {
@@ -190,6 +192,11 @@ void ff_ac3_adjust_frame_size(AC3EncodeContext *s)
 }
 
 
+/**
+ * Set the initial coupling strategy parameters prior to coupling analysis.
+ *
+ * @param s  AC-3 encoder private context
+ */
 void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
 {
     int blk, ch;
@@ -258,6 +265,8 @@ void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
 
 /**
  * Apply stereo rematrixing to coefficients based on rematrixing flags.
+ *
+ * @param s  AC-3 encoder private context
  */
 void ff_ac3_apply_rematrixing(AC3EncodeContext *s)
 {
@@ -290,7 +299,7 @@ void ff_ac3_apply_rematrixing(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Initialize exponent tables.
  */
 static av_cold void exponent_init(AC3EncodeContext *s)
@@ -312,7 +321,7 @@ static av_cold void exponent_init(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Extract exponents from the MDCT coefficients.
  */
 static void extract_exponents(AC3EncodeContext *s)
@@ -341,7 +350,7 @@ static const uint8_t exp_strategy_reuse_tab[4][6] = {
     { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 }
 };
 
-/**
+/*
  * Calculate exponent strategies for all channels.
  * Array arrangement is reversed to simplify the per-channel calculation.
  */
@@ -405,6 +414,11 @@ static void compute_exp_strategy(AC3EncodeContext *s)
 
 /**
  * Update the exponents so that they are the ones the decoder will decode.
+ *
+ * @param[in,out] exp   array of exponents for 1 block in 1 channel
+ * @param nb_exps       number of exponents in active bandwidth
+ * @param exp_strategy  exponent strategy for the block
+ * @param cpl           indicates if the block is in the coupling channel
  */
 static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
                                     int cpl)
@@ -473,7 +487,7 @@ static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
 }
 
 
-/**
+/*
  * Encode exponents from original extracted form to what the decoder will see.
  * This copies and groups exponents based on exponent strategy and reduces
  * deltas between adjacent exponent groups so that they can be differentially
@@ -526,7 +540,7 @@ static void encode_exponents(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Count exponent bits based on bandwidth, coupling, and exponent strategies.
  */
 static int count_exponent_bits(AC3EncodeContext *s)
@@ -558,6 +572,8 @@ static int count_exponent_bits(AC3EncodeContext *s)
  * Group exponents.
  * 3 delta-encoded exponents are in each 7-bit group. The number of groups
  * varies depending on exponent strategy and bandwidth.
+ *
+ * @param s  AC-3 encoder private context
  */
 void ff_ac3_group_exponents(AC3EncodeContext *s)
 {
@@ -614,6 +630,8 @@ void ff_ac3_group_exponents(AC3EncodeContext *s)
  * Calculate final exponents from the supplied MDCT coefficients and exponent shift.
  * Extract exponents from MDCT coefficients, calculate exponent strategies,
  * and encode final exponents.
+ *
+ * @param s  AC-3 encoder private context
  */
 void ff_ac3_process_exponents(AC3EncodeContext *s)
 {
@@ -627,7 +645,7 @@ void ff_ac3_process_exponents(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Count frame bits that are based solely on fixed parameters.
  * This only has to be run once when the encoder is initialized.
  */
@@ -733,7 +751,7 @@ static void count_frame_bits_fixed(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Initialize bit allocation.
  * Set default parameter codes and calculate parameter values.
  */
@@ -768,7 +786,7 @@ static void bit_alloc_init(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Count the bits used to encode the frame, minus exponents and mantissas.
  * Bits based on fixed parameters have already been counted, so now we just
  * have to add the bits based on parameters that change during encoding.
@@ -915,7 +933,7 @@ static void count_frame_bits(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Calculate masking curve based on the final exponents.
  * Also calculate the power spectral densities to use in future calculations.
  */
@@ -945,7 +963,7 @@ static void bit_alloc_masking(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Ensure that bap for each block and channel point to the current bap_buffer.
  * They may have been switched during the bit allocation search.
  */
@@ -971,6 +989,8 @@ static void reset_block_bap(AC3EncodeContext *s)
  * Initialize mantissa counts.
  * These are set so that they are padded to the next whole group size when bits
  * are counted in compute_mantissa_size.
+ *
+ * @param[in,out] mant_cnt  running counts for each bap value for each block
  */
 static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
 {
@@ -987,6 +1007,12 @@ static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
 /**
  * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth
  * range.
+ *
+ * @param s                 AC-3 encoder private context
+ * @param ch                channel index
+ * @param[in,out] mant_cnt  running counts for each bap value for each block
+ * @param start             starting coefficient bin
+ * @param end               ending coefficient bin
  */
 static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
                                           uint16_t mant_cnt[AC3_MAX_BLOCKS][16],
@@ -1005,7 +1031,7 @@ static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
 }
 
 
-/**
+/*
  * Count the number of mantissa bits in the frame based on the bap values.
  */
 static int count_mantissa_bits(AC3EncodeContext *s)
@@ -1028,6 +1054,9 @@ static int count_mantissa_bits(AC3EncodeContext *s)
  * Run the bit allocation with a given SNR offset.
  * This calculates the bit allocation pointers that will be used to determine
  * the quantization of each mantissa.
+ *
+ * @param s           AC-3 encoder private context
+ * @param snr_offset  SNR offset, 0 to 1023
  * @return the number of bits needed for mantissas if the given SNR offset is
  *         is used.
  */
@@ -1058,7 +1087,7 @@ static int bit_alloc(AC3EncodeContext *s, int snr_offset)
 }
 
 
-/**
+/*
  * Constant bitrate bit allocation search.
  * Find the largest SNR offset that will allow data to fit in the frame.
  */
@@ -1107,7 +1136,7 @@ static int cbr_bit_allocation(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Perform bit allocation search.
  * Finds the SNR offset value that maximizes quality and fits in the specified
  * frame size.  Output is the SNR offset and a set of bit allocation pointers
@@ -1127,6 +1156,11 @@ int ff_ac3_compute_bit_allocation(AC3EncodeContext *s)
 
 /**
  * Symmetric quantization on 'levels' levels.
+ *
+ * @param c       unquantized coefficient
+ * @param e       exponent
+ * @param levels  number of quantization levels
+ * @return        quantized coefficient
  */
 static inline int sym_quant(int c, int e, int levels)
 {
@@ -1138,6 +1172,11 @@ static inline int sym_quant(int c, int e, int levels)
 
 /**
  * Asymmetric quantization on 2^qbits levels.
+ *
+ * @param c      unquantized coefficient
+ * @param e      exponent
+ * @param qbits  number of quantization bits
+ * @return       quantized coefficient
  */
 static inline int asym_quant(int c, int e, int qbits)
 {
@@ -1154,6 +1193,14 @@ static inline int asym_quant(int c, int e, int qbits)
 
 /**
  * Quantize a set of mantissas for a single channel in a single block.
+ *
+ * @param s           Mantissa count context
+ * @param fixed_coef  unquantized fixed-point coefficients
+ * @param exp         exponents
+ * @param bap         bit allocation pointer indices
+ * @param[out] qmant  quantized coefficients
+ * @param start_freq  starting coefficient bin
+ * @param end_freq    ending coefficient bin
  */
 static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
                                       uint8_t *exp, uint8_t *bap,
@@ -1249,6 +1296,8 @@ static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
 
 /**
  * Quantize mantissas using coefficients, exponents, and bit allocation pointers.
+ *
+ * @param s  AC-3 encoder private context
  */
 void ff_ac3_quantize_mantissas(AC3EncodeContext *s)
 {
@@ -1276,7 +1325,7 @@ void ff_ac3_quantize_mantissas(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Write the AC-3 frame header to the output bitstream.
  */
 static void ac3_output_frame_header(AC3EncodeContext *s)
@@ -1332,7 +1381,7 @@ static void ac3_output_frame_header(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Write one audio block to the output bitstream.
  */
 static void output_audio_block(AC3EncodeContext *s, int blk)
@@ -1560,7 +1609,7 @@ static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly)
 }
 
 
-/**
+/*
  * Fill the end of the frame with 0's and compute the two CRCs.
  */
 static void output_frame_end(AC3EncodeContext *s)
@@ -1608,6 +1657,9 @@ static void output_frame_end(AC3EncodeContext *s)
 
 /**
  * Write the frame to the output bitstream.
+ *
+ * @param s      AC-3 encoder private context
+ * @param frame  output data buffer
  */
 void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame)
 {
@@ -1778,6 +1830,8 @@ static void validate_mix_level(void *log_ctx, const char *opt_name,
 /**
  * Validate metadata options as set by AVOption system.
  * These values can optionally be changed per-frame.
+ *
+ * @param s  AC-3 encoder private context
  */
 int ff_ac3_validate_metadata(AC3EncodeContext *s)
 {
@@ -1960,6 +2014,8 @@ int ff_ac3_validate_metadata(AC3EncodeContext *s)
 
 /**
  * Finalize encoding and free any memory allocated by the encoder.
+ *
+ * @param avctx  Codec context
  */
 av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
 {
@@ -2003,7 +2059,7 @@ av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
 }
 
 
-/**
+/*
  * Set channel information during initialization.
  */
 static av_cold int set_channel_info(AC3EncodeContext *s, int channels,
@@ -2173,7 +2229,7 @@ static av_cold int validate_options(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Set bandwidth for all channels.
  * The user can optionally supply a cutoff frequency. Otherwise an appropriate
  * default value will be used.
@@ -2351,9 +2407,6 @@ alloc_fail:
 }
 
 
-/**
- * Initialize the encoder.
- */
 av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
 {
     AC3EncodeContext *s = avctx->priv_data;

libavcodec/ac3enc_fixed.c

@@ -41,6 +41,8 @@ static const AVClass ac3enc_class = { "Fixed-Point AC-3 Encoder", av_default_ite
 
 /**
  * Finalize MDCT and free allocated memory.
+ *
+ * @param s  AC-3 encoder private context
  */
 av_cold void AC3_NAME(mdct_end)(AC3EncodeContext *s)
 {
@@ -50,7 +52,9 @@ av_cold void AC3_NAME(mdct_end)(AC3EncodeContext *s)
 
 /**
  * Initialize MDCT tables.
- * @param nbits log2(MDCT size)
+ *
+ * @param s  AC-3 encoder private context
+ * @return   0 on success, negative error code on failure
  */
 av_cold int AC3_NAME(mdct_init)(AC3EncodeContext *s)
 {
@@ -60,7 +64,7 @@ av_cold int AC3_NAME(mdct_init)(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Apply KBD window to input samples prior to MDCT.
  */
 static void apply_window(DSPContext *dsp, int16_t *output, const int16_t *input,
@@ -70,11 +74,9 @@ static void apply_window(DSPContext *dsp, int16_t *output, const int16_t *input,
 }
 
 
-/**
+/*
  * Normalize the input samples to use the maximum available precision.
  * This assumes signed 16-bit input samples.
- *
- * @return exponent shift
  */
 static int normalize_samples(AC3EncodeContext *s)
 {
@@ -87,7 +89,7 @@ static int normalize_samples(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Scale MDCT coefficients to 25-bit signed fixed-point.
  */
 static void scale_coefficients(AC3EncodeContext *s)
@@ -104,7 +106,7 @@ static void scale_coefficients(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Clip MDCT coefficients to allowable range.
  */
 static void clip_coefficients(DSPContext *dsp, int32_t *coef, unsigned int len)
@@ -113,7 +115,7 @@ static void clip_coefficients(DSPContext *dsp, int32_t *coef, unsigned int len)
 }
 
 
-/**
+/*
  * Calculate a single coupling coordinate.
  */
 static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)

libavcodec/ac3enc_float.c

@@ -44,6 +44,8 @@ static const AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
 
 /**
  * Finalize MDCT and free allocated memory.
+ *
+ * @param s  AC-3 encoder private context
  */
 av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
 {
@@ -54,7 +56,9 @@ av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
 
 /**
  * Initialize MDCT tables.
- * @param nbits log2(MDCT size)
+ *
+ * @param s  AC-3 encoder private context
+ * @return   0 on success, negative error code on failure
  */
 av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
 {
@@ -78,7 +82,7 @@ av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Apply KBD window to input samples prior to MDCT.
  */
 static void apply_window(DSPContext *dsp, float *output, const float *input,
@@ -88,7 +92,7 @@ static void apply_window(DSPContext *dsp, float *output, const float *input,
 }
 
 
-/**
+/*
  * Normalize the input samples.
  * Not needed for the floating-point encoder.
  */
@@ -98,7 +102,7 @@ static int normalize_samples(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Scale MDCT coefficients from float to 24-bit fixed-point.
  */
 static void scale_coefficients(AC3EncodeContext *s)
@@ -111,7 +115,7 @@ static void scale_coefficients(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Clip MDCT coefficients to allowable range.
  */
 static void clip_coefficients(DSPContext *dsp, float *coef, unsigned int len)
@@ -120,7 +124,7 @@ static void clip_coefficients(DSPContext *dsp, float *coef, unsigned int len)
 }
 
 
-/**
+/*
  * Calculate a single coupling coordinate.
  */
 static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)

libavcodec/ac3enc_template.c

@@ -64,7 +64,7 @@ alloc_fail:
 }
 
 
-/**
+/*
  * Deinterleave input samples.
  * Channels are reordered from Libav's default order to AC-3 order.
  */
@@ -93,7 +93,7 @@ static void deinterleave_input_samples(AC3EncodeContext *s,
 }
 
 
-/**
+/*
  * Apply the MDCT to input samples to generate frequency coefficients.
  * This applies the KBD window and normalizes the input to reduce precision
  * loss due to fixed-point calculations.
@@ -120,7 +120,7 @@ static void apply_mdct(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Calculate coupling channel and coupling coordinates.
  */
 static void apply_channel_coupling(AC3EncodeContext *s)
@@ -328,7 +328,7 @@ static void apply_channel_coupling(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Determine rematrixing flags for each block and band.
  */
 static void compute_rematrixing_strategy(AC3EncodeContext *s)
@@ -391,9 +391,6 @@ static void compute_rematrixing_strategy(AC3EncodeContext *s)
 }
 
 
-/**
- * Encode a single AC-3 frame.
- */
 int AC3_NAME(encode_frame)(AVCodecContext *avctx, unsigned char *frame,
                            int buf_size, void *data)
 {