doxygen: misc consistency, spelling and wording fixes

libavcodec/aacpsy.c

@@ -216,7 +216,7 @@ static const float psy_fir_coeffs[] = {
 };
 
 /**
- * calculates the attack threshold for ABR from the above table for the LAME psy model
+ * Calculate the ABR attack threshold from the above LAME psymodel table.
  */
 static float lame_calc_attack_threshold(int bitrate)
 {

libavcodec/amrwbdec.c

@@ -111,7 +111,7 @@ static av_cold int amrwb_decode_init(AVCodecContext *avctx)
 
 /**
  * Decode the frame header in the "MIME/storage" format. This format
- * is simpler and does not carry the auxiliary information of the frame
+ * is simpler and does not carry the auxiliary frame information.
  *
  * @param[in] ctx                  The Context
  * @param[in] buf                  Pointer to the input buffer
@@ -133,7 +133,7 @@ static int decode_mime_header(AMRWBContext *ctx, const uint8_t *buf)
 }
 
 /**
- * Decodes quantized ISF vectors using 36-bit indexes (6K60 mode only)
+ * Decode quantized ISF vectors using 36-bit indexes (6K60 mode only).
  *
  * @param[in]  ind                 Array of 5 indexes
  * @param[out] isf_q               Buffer for isf_q[LP_ORDER]
@@ -160,7 +160,7 @@ static void decode_isf_indices_36b(uint16_t *ind, float *isf_q)
 }
 
 /**
- * Decodes quantized ISF vectors using 46-bit indexes (except 6K60 mode)
+ * Decode quantized ISF vectors using 46-bit indexes (except 6K60 mode).
  *
  * @param[in]  ind                 Array of 7 indexes
  * @param[out] isf_q               Buffer for isf_q[LP_ORDER]
@@ -193,8 +193,8 @@ static void decode_isf_indices_46b(uint16_t *ind, float *isf_q)
 }
 
 /**
- * Apply mean and past ISF values using the prediction factor
- * Updates past ISF vector
+ * Apply mean and past ISF values using the prediction factor.
+ * Updates past ISF vector.
  *
  * @param[in,out] isf_q            Current quantized ISF
  * @param[in,out] isf_past         Past quantized ISF
@@ -215,7 +215,7 @@ static void isf_add_mean_and_past(float *isf_q, float *isf_past)
 
 /**
  * Interpolate the fourth ISP vector from current and past frames
- * to obtain a ISP vector for each subframe
+ * to obtain an ISP vector for each subframe.
  *
  * @param[in,out] isp_q            ISPs for each subframe
  * @param[in]     isp4_past        Past ISP for subframe 4
@@ -232,9 +232,9 @@ static void interpolate_isp(double isp_q[4][LP_ORDER], const double *isp4_past)
 }
 
 /**
- * Decode an adaptive codebook index into pitch lag (except 6k60, 8k85 modes)
- * Calculate integer lag and fractional lag always using 1/4 resolution
- * In 1st and 3rd subframes the index is relative to last subframe integer lag
+ * Decode an adaptive codebook index into pitch lag (except 6k60, 8k85 modes).
+ * Calculate integer lag and fractional lag always using 1/4 resolution.
+ * In 1st and 3rd subframes the index is relative to last subframe integer lag.
  *
  * @param[out]    lag_int          Decoded integer pitch lag
  * @param[out]    lag_frac         Decoded fractional pitch lag
@@ -271,9 +271,9 @@ static void decode_pitch_lag_high(int *lag_int, int *lag_frac, int pitch_index,
 }
 
 /**
- * Decode a adaptive codebook index into pitch lag for 8k85 and 6k60 modes
- * Description is analogous to decode_pitch_lag_high, but in 6k60 relative
- * index is used for all subframes except the first
+ * Decode an adaptive codebook index into pitch lag for 8k85 and 6k60 modes.
+ * The description is analogous to decode_pitch_lag_high, but in 6k60 the
+ * relative index is used for all subframes except the first.
  */
 static void decode_pitch_lag_low(int *lag_int, int *lag_frac, int pitch_index,
                                  uint8_t *base_lag_int, int subframe, enum Mode mode)
@@ -298,7 +298,7 @@ static void decode_pitch_lag_low(int *lag_int, int *lag_frac, int pitch_index,
 
 /**
  * Find the pitch vector by interpolating the past excitation at the
- * pitch delay, which is obtained in this function
+ * pitch delay, which is obtained in this function.
  *
  * @param[in,out] ctx              The context
  * @param[in]     amr_subframe     Current subframe data
@@ -351,10 +351,10 @@ static void decode_pitch_vector(AMRWBContext *ctx,
 /**
  * The next six functions decode_[i]p_track decode exactly i pulses
  * positions and amplitudes (-1 or 1) in a subframe track using
- * an encoded pulse indexing (TS 26.190 section 5.8.2)
+ * an encoded pulse indexing (TS 26.190 section 5.8.2).
  *
  * The results are given in out[], in which a negative number means
- * amplitude -1 and vice versa (i.e., ampl(x) = x / abs(x) )
+ * amplitude -1 and vice versa (i.e., ampl(x) = x / abs(x) ).
  *
  * @param[out] out                 Output buffer (writes i elements)
  * @param[in]  code                Pulse index (no. of bits varies, see below)
@@ -470,7 +470,7 @@ static void decode_6p_track(int *out, int code, int m, int off) ///code: 6m-2 bi
 
 /**
  * Decode the algebraic codebook index to pulse positions and signs,
- * then construct the algebraic codebook vector
+ * then construct the algebraic codebook vector.
  *
  * @param[out] fixed_vector        Buffer for the fixed codebook excitation
  * @param[in]  pulse_hi            MSBs part of the pulse index array (higher modes only)
@@ -541,7 +541,7 @@ static void decode_fixed_vector(float *fixed_vector, const uint16_t *pulse_hi,
 }
 
 /**
- * Decode pitch gain and fixed gain correction factor
+ * Decode pitch gain and fixed gain correction factor.
  *
  * @param[in]  vq_gain             Vector-quantized index for gains
  * @param[in]  mode                Mode of the current frame
@@ -559,7 +559,7 @@ static void decode_gains(const uint8_t vq_gain, const enum Mode mode,
 }
 
 /**
- * Apply pitch sharpening filters to the fixed codebook vector
+ * Apply pitch sharpening filters to the fixed codebook vector.
  *
  * @param[in]     ctx              The context
  * @param[in,out] fixed_vector     Fixed codebook excitation
@@ -580,7 +580,7 @@ static void pitch_sharpening(AMRWBContext *ctx, float *fixed_vector)
 }
 
 /**
- * Calculate the voicing factor (-1.0 = unvoiced to 1.0 = voiced)
+ * Calculate the voicing factor (-1.0 = unvoiced to 1.0 = voiced).
  *
  * @param[in] p_vector, f_vector   Pitch and fixed excitation vectors
  * @param[in] p_gain, f_gain       Pitch and fixed gains
@@ -599,8 +599,8 @@ static float voice_factor(float *p_vector, float p_gain,
 }
 
 /**
- * Reduce fixed vector sparseness by smoothing with one of three IR filters
- * Also known as "adaptive phase dispersion"
+ * Reduce fixed vector sparseness by smoothing with one of three IR filters,
+ * also known as "adaptive phase dispersion".
  *
  * @param[in]     ctx              The context
  * @param[in,out] fixed_vector     Unfiltered fixed vector
@@ -670,7 +670,7 @@ static float *anti_sparseness(AMRWBContext *ctx,
 
 /**
  * Calculate a stability factor {teta} based on distance between
- * current and past isf. A value of 1 shows maximum signal stability
+ * current and past isf. A value of 1 shows maximum signal stability.
  */
 static float stability_factor(const float *isf, const float *isf_past)
 {
@@ -687,7 +687,7 @@ static float stability_factor(const float *isf, const float *isf_past)
 
 /**
  * Apply a non-linear fixed gain smoothing in order to reduce
- * fluctuation in the energy of excitation
+ * fluctuation in the energy of excitation.
  *
  * @param[in]     fixed_gain       Unsmoothed fixed gain
  * @param[in,out] prev_tr_gain     Previous threshold gain (updated)
@@ -718,7 +718,7 @@ static float noise_enhancer(float fixed_gain, float *prev_tr_gain,
 }
 
 /**
- * Filter the fixed_vector to emphasize the higher frequencies
+ * Filter the fixed_vector to emphasize the higher frequencies.
  *
  * @param[in,out] fixed_vector     Fixed codebook vector
  * @param[in]     voice_fac        Frame voicing factor
@@ -742,7 +742,7 @@ static void pitch_enhancer(float *fixed_vector, float voice_fac)
 }
 
 /**
- * Conduct 16th order linear predictive coding synthesis from excitation
+ * Conduct 16th order linear predictive coding synthesis from excitation.
  *
  * @param[in]     ctx              Pointer to the AMRWBContext
  * @param[in]     lpc              Pointer to the LPC coefficients
@@ -802,7 +802,7 @@ static void de_emphasis(float *out, float *in, float m, float mem[1])
 
 /**
  * Upsample a signal by 5/4 ratio (from 12.8kHz to 16kHz) using
- * a FIR interpolation filter. Uses past data from before *in address
+ * a FIR interpolation filter. Uses past data from before *in address.
  *
  * @param[out] out                 Buffer for interpolated signal
  * @param[in]  in                  Current signal data (length 0.8*o_size)
@@ -832,7 +832,7 @@ static void upsample_5_4(float *out, const float *in, int o_size)
 
 /**
  * Calculate the high-band gain based on encoded index (23k85 mode) or
- * on the low-band speech signal and the Voice Activity Detection flag
+ * on the low-band speech signal and the Voice Activity Detection flag.
  *
  * @param[in] ctx                  The context
  * @param[in] synth                LB speech synthesis at 12.8k
@@ -857,7 +857,7 @@ static float find_hb_gain(AMRWBContext *ctx, const float *synth,
 
 /**
  * Generate the high-band excitation with the same energy from the lower
- * one and scaled by the given gain
+ * one and scaled by the given gain.
  *
  * @param[in]  ctx                 The context
  * @param[out] hb_exc              Buffer for the excitation
@@ -880,7 +880,7 @@ static void scaled_hb_excitation(AMRWBContext *ctx, float *hb_exc,
 }
 
 /**
- * Calculate the auto-correlation for the ISF difference vector
+ * Calculate the auto-correlation for the ISF difference vector.
  */
 static float auto_correlation(float *diff_isf, float mean, int lag)
 {
@@ -896,7 +896,7 @@ static float auto_correlation(float *diff_isf, float mean, int lag)
 
 /**
  * Extrapolate a ISF vector to the 16kHz range (20th order LP)
- * used at mode 6k60 LP filter for the high frequency band
+ * used at mode 6k60 LP filter for the high frequency band.
  *
  * @param[out] out                 Buffer for extrapolated isf
  * @param[in]  isf                 Input isf vector
@@ -981,7 +981,7 @@ static void lpc_weighting(float *out, const float *lpc, float gamma, int size)
 
 /**
  * Conduct 20th order linear predictive coding synthesis for the high
- * frequency band excitation at 16kHz
+ * frequency band excitation at 16kHz.
  *
  * @param[in]     ctx              The context
  * @param[in]     subframe         Current subframe index (0 to 3)
@@ -1019,8 +1019,8 @@ static void hb_synthesis(AMRWBContext *ctx, int subframe, float *samples,
 }
 
 /**
- * Apply to high-band samples a 15th order filter
- * The filter characteristic depends on the given coefficients
+ * Apply a 15th order filter to high-band samples.
+ * The filter characteristic depends on the given coefficients.
  *
  * @param[out]    out              Buffer for filtered output
  * @param[in]     fir_coef         Filter coefficients
@@ -1048,7 +1048,7 @@ static void hb_fir_filter(float *out, const float fir_coef[HB_FIR_SIZE + 1],
 }
 
 /**
- * Update context state before the next subframe
+ * Update context state before the next subframe.
  */
 static void update_sub_state(AMRWBContext *ctx)
 {

libavcodec/avcodec.h

@@ -2591,7 +2591,7 @@ typedef struct AVCodecContext {
 
 #if FF_API_X264_GLOBAL_OPTS
     /**
-     * Influences how often B-frames are used.
+     * Influence how often B-frames are used.
      * - encoding: Set by user.
      * - decoding: unused
      */
@@ -2672,7 +2672,7 @@ typedef struct AVCodecContext {
     int mv0_threshold;
 
     /**
-     * Adjusts sensitivity of b_frame_strategy 1.
+     * Adjust sensitivity of b_frame_strategy 1.
      * - encoding: Set by user.
      * - decoding: unused
      */
@@ -2956,7 +2956,7 @@ typedef struct AVCodecContext {
 
 #if FF_API_FLAC_GLOBAL_OPTS
     /**
-     * Determines which LPC analysis algorithm to use.
+     * Determine which LPC analysis algorithm to use.
      * - encoding: Set by user
      * - decoding: unused
      */
@@ -4121,7 +4121,7 @@ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
                             AVPacket *avpkt);
 
 /**
- * Frees all allocated data in the given subtitle struct.
+ * Free all allocated data in the given subtitle struct.
  *
  * @param sub AVSubtitle to free.
  */
@@ -4486,7 +4486,7 @@ int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
 
 /**
- * Logs a generic warning message about a missing feature. This function is
+ * Log a generic warning message about a missing feature. This function is
  * intended to be used internally by Libav (libavcodec, libavformat, etc.)
  * only, and would normally not be used by applications.
  * @param[in] avc a pointer to an arbitrary struct of which the first field is

libavcodec/cavs_parser.c

@@ -30,7 +30,7 @@
 
 
 /**
- * finds the end of the current frame in the bitstream.
+ * Find the end of the current frame in the bitstream.
  * @return the position of the first byte of the next frame, or -1
  */
 static int cavs_find_frame_end(ParseContext *pc, const uint8_t *buf,

libavcodec/celp_math.h

@@ -64,7 +64,7 @@ static inline int bidir_sal(int value, int offset)
 }
 
 /**
- * returns the dot product.
+ * Return the dot product.
  * @param a input data array
  * @param b input data array
  * @param length number of elements

libavcodec/dca_parser.c

@@ -39,7 +39,7 @@ typedef struct DCAParseContext {
  || state == DCA_MARKER_RAW_LE || state == DCA_MARKER_RAW_BE)
 
 /**
- * finds the end of the current frame in the bitstream.
+ * Find the end of the current frame in the bitstream.
  * @return the position of the first byte of the next frame, or -1
  */
 static int dca_find_frame_end(DCAParseContext * pc1, const uint8_t * buf,

libavcodec/dsputil.c

@@ -1779,7 +1779,7 @@ static void add_8x8basis_c(int16_t rem[64], int16_t basis[64], int scale){
 }
 
 /**
- * permutes an 8x8 block.
+ * Permute an 8x8 block.
  * @param block the block which will be permuted according to the given permutation vector
  * @param permutation the permutation vector
  * @param last the last non zero coefficient in scantable order, used to speed the permutation up

libavcodec/error_resilience.c

@@ -80,7 +80,7 @@ static void set_mv_strides(MpegEncContext *s, int *mv_step, int *stride){
 }
 
 /**
- * replaces the current MB with a flat dc only version.
+ * Replace the current MB with a flat dc-only version.
  */
 static void put_dc(MpegEncContext *s, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, int mb_x, int mb_y)
 {
@@ -711,7 +711,7 @@ void ff_er_frame_start(MpegEncContext *s){
 }
 
 /**
- * adds a slice.
+ * Add a slice.
  * @param endx x component of the last macroblock, can be -1 for the last of the previous line
  * @param status the status at the end (MV_END, AC_ERROR, ...), it is assumed that no earlier end or
  *               error of the same type occurred

libavcodec/get_bits.h

@@ -85,13 +85,13 @@ gb
     getbitcontext
 
 OPEN_READER(name, gb)
-    loads gb into local variables
+    load gb into local variables
 
 CLOSE_READER(name, gb)
-    stores local vars in gb
+    store local vars in gb
 
 UPDATE_CACHE(name, gb)
-    refills the internal cache from the bitstream
+    refill the internal cache from the bitstream
     after this call at least MIN_CACHE_BITS will be available,
 
 GET_CACHE(name, gb)
@@ -282,7 +282,7 @@ static inline unsigned int get_bits(GetBitContext *s, int n){
 }
 
 /**
- * Shows 1-25 bits.
+ * Show 1-25 bits.
  */
 static inline unsigned int show_bits(GetBitContext *s, int n){
     register int tmp;
@@ -329,7 +329,7 @@ static inline void skip_bits1(GetBitContext *s){
 }
 
 /**
- * reads 0-32 bits.
+ * Read 0-32 bits.
  */
 static inline unsigned int get_bits_long(GetBitContext *s, int n){
     if (n <= MIN_CACHE_BITS) return get_bits(s, n);
@@ -345,14 +345,14 @@ static inline unsigned int get_bits_long(GetBitContext *s, int n){
 }
 
 /**
- * reads 0-32 bits as a signed integer.
+ * Read 0-32 bits as a signed integer.
  */
 static inline int get_sbits_long(GetBitContext *s, int n) {
     return sign_extend(get_bits_long(s, n), n);
 }
 
 /**
- * shows 0-32 bits.
+ * Show 0-32 bits.
  */
 static inline unsigned int show_bits_long(GetBitContext *s, int n){
     if (n <= MIN_CACHE_BITS) return show_bits(s, n);
@@ -372,7 +372,7 @@ static inline int check_marker(GetBitContext *s, const char *msg)
 }
 
 /**
- * init GetBitContext.
+ * Inititalize GetBitContext.
  * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger than the actual read bits
  * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
  * @param bit_size the size of the buffer in bits
@@ -434,7 +434,6 @@ void free_vlc(VLC *vlc);
 
 
 /**
- *
  * If the vlc code is invalid and max_depth=1, then no bits will be removed.
  * If the vlc code is invalid and max_depth>1, then the number of bits removed
  * is undefined.
@@ -496,7 +495,7 @@ void free_vlc(VLC *vlc);
 
 
 /**
- * parses a vlc code, faster than get_vlc()
+ * Parse a vlc code, faster than get_vlc().
  * @param bits is the number of bits which will be read at once, must be
  *             identical to nb_bits in init_vlc()
  * @param max_depth is the number of times bits bits must be read to completely

libavcodec/h261dec.c

@@ -97,7 +97,7 @@ static av_cold int h261_decode_init(AVCodecContext *avctx){
 }
 
 /**
- * decodes the group of blocks header or slice header.
+ * Decode the group of blocks header or slice header.
  * @return <0 if an error occurred
  */
 static int h261_decode_gob_header(H261Context *h){
@@ -150,7 +150,7 @@ static int h261_decode_gob_header(H261Context *h){
 }
 
 /**
- * decodes the group of blocks / video packet header.
+ * Decode the group of blocks / video packet header.
  * @return <0 if no resync found
  */
 static int ff_h261_resync(H261Context *h){
@@ -191,7 +191,7 @@ static int ff_h261_resync(H261Context *h){
 }
 
 /**
- * decodes skipped macroblocks
+ * Decode skipped macroblocks.
  * @return 0
  */
 static int h261_decode_mb_skipped(H261Context *h, int mba1, int mba2 )
@@ -355,7 +355,7 @@ intra:
 }
 
 /**
- * decodes a macroblock
+ * Decode a macroblock.
  * @return <0 if an error occurred
  */
 static int h261_decode_block(H261Context * h, DCTELEM * block,
@@ -437,7 +437,7 @@ static int h261_decode_block(H261Context * h, DCTELEM * block,
 }
 
 /**
- * decodes the H261 picture header.
+ * Decode the H.261 picture header.
  * @return <0 if no startcode found
  */
 static int h261_decode_picture_header(H261Context *h){

libavcodec/h261enc.c

@@ -251,7 +251,7 @@ void ff_h261_encode_init(MpegEncContext *s){
 
 
 /**
- * encodes a 8x8 block.
+ * Encode an 8x8 block.
  * @param block the 8x8 block
  * @param n block index (0-3 are luma, 4-5 are chroma)
  */

libavcodec/h263dec.c

@@ -127,7 +127,7 @@ av_cold int ff_h263_decode_end(AVCodecContext *avctx)
 }
 
 /**
- * returns the number of bytes consumed for building the current frame
+ * Return the number of bytes consumed for building the current frame.
  */
 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
     int pos= (get_bits_count(&s->gb)+7)>>3;

libavcodec/h264.c

@@ -62,7 +62,8 @@ static const enum PixelFormat hwaccel_pixfmt_list_h264_jpeg_420[] = {
 };
 
 /**
- * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
+ * Check if the top & left blocks are available if needed and
+ * change the dc mode so it only uses the available blocks.
  */
 int ff_h264_check_intra4x4_pred_mode(H264Context *h){
     MpegEncContext * const s = &h->s;
@@ -101,7 +102,8 @@ int ff_h264_check_intra4x4_pred_mode(H264Context *h){
 } //FIXME cleanup like ff_h264_check_intra_pred_mode
 
 /**
- * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
+ * Check if the top & left blocks are available if needed and
+ * change the dc mode so it only uses the available blocks.
  */
 int ff_h264_check_intra_pred_mode(H264Context *h, int mode){
     MpegEncContext * const s = &h->s;
@@ -2592,7 +2594,7 @@ static void clone_slice(H264Context *dst, H264Context *src)
 }
 
 /**
- * computes profile from profile_idc and constraint_set?_flags
+ * Compute profile from profile_idc and constraint_set?_flags.
  *
  * @param sps SPS
  *
@@ -2619,7 +2621,7 @@ int ff_h264_get_profile(SPS *sps)
 }
 
 /**
- * decodes a slice header.
+ * Decode a slice header.
  * This will also call MPV_common_init() and frame_start() as needed.
  *
  * @param h h264context
@@ -3982,7 +3984,7 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size){
 }
 
 /**
- * returns the number of bytes consumed for building the current frame
+ * Return the number of bytes consumed for building the current frame.
  */
 static int get_consumed_bytes(MpegEncContext *s, int pos, int buf_size){
         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)

libavcodec/h264.h

@@ -762,14 +762,14 @@ static av_always_inline uint16_t pack8to16(int a, int b){
 }
 
 /**
- * gets the chroma qp.
+ * Get the chroma qp.
  */
 static av_always_inline int get_chroma_qp(H264Context *h, int t, int qscale){
     return h->pps.chroma_qp_table[t][qscale];
 }
 
 /**
- * gets the predicted intra4x4 prediction mode.
+ * Get the predicted intra4x4 prediction mode.
  */
 static av_always_inline int pred_intra_mode(H264Context *h, int n){
     const int index8= scan8[n];

libavcodec/h264_cabac.c

@@ -1862,7 +1862,7 @@ static av_always_inline void decode_cabac_luma_residual( H264Context *h, const u
 }
 
 /**
- * decodes a macroblock
+ * Decode a macroblock.
  * @return 0 if OK, AC_ERROR / DC_ERROR / MV_ERROR if an error is noticed
  */
 int ff_h264_decode_mb_cabac(H264Context *h) {

libavcodec/h264_cavlc.c

@@ -281,7 +281,7 @@ static int8_t cavlc_level_tab[7][1<<LEVEL_TAB_BITS][2];
 #define RUN7_VLC_BITS                  6
 
 /**
- * gets the predicted number of non-zero coefficients.
+ * Get the predicted number of non-zero coefficients.
  * @param n block index
  */
 static inline int pred_non_zero_count(H264Context *h, int n){
@@ -436,7 +436,7 @@ static inline int get_level_prefix(GetBitContext *gb){
 }
 
 /**
- * decodes a residual block.
+ * Decode a residual block.
  * @param n block index
  * @param scantable scantable
  * @param max_coeff number of coefficients in the block

libavcodec/h264_mvpred.h

@@ -86,7 +86,7 @@ static av_always_inline int fetch_diagonal_mv(H264Context *h, const int16_t **C,
 }
 
 /**
- * gets the predicted MV.
+ * Get the predicted MV.
  * @param n the block index
  * @param part_width the width of the partition (4, 8,16) -> (1, 2, 4)
  * @param mx the x component of the predicted motion vector
@@ -142,7 +142,7 @@ static av_always_inline void pred_motion(H264Context * const h, int n, int part_
 }
 
 /**
- * gets the directionally predicted 16x8 MV.
+ * Get the directionally predicted 16x8 MV.
  * @param n the block index
  * @param mx the x component of the predicted motion vector
  * @param my the y component of the predicted motion vector
@@ -177,7 +177,7 @@ static av_always_inline void pred_16x8_motion(H264Context * const h, int n, int
 }
 
 /**
- * gets the directionally predicted 8x16 MV.
+ * Get the directionally predicted 8x16 MV.
  * @param n the block index
  * @param mx the x component of the predicted motion vector
  * @param my the y component of the predicted motion vector

libavcodec/ituh263dec.c

@@ -148,7 +148,7 @@ int ff_h263_decode_mba(MpegEncContext *s)
 }
 
 /**
- * decodes the group of blocks header or slice header.
+ * Decode the group of blocks header or slice header.
  * @return <0 if an error occurred
  */
 static int h263_decode_gob_header(MpegEncContext *s)
@@ -203,7 +203,7 @@ static int h263_decode_gob_header(MpegEncContext *s)
 }
 
 /**
- * finds the next resync_marker
+ * Find the next resync_marker.
  * @param p pointer to buffer to scan
  * @param end pointer to the end of the buffer
  * @return pointer to the next resync_marker, or end if none was found
@@ -224,7 +224,7 @@ const uint8_t *ff_h263_find_resync_marker(const uint8_t *restrict p, const uint8
 }
 
 /**
- * decodes the group of blocks / video packet header.
+ * Decode the group of blocks / video packet header.
  * @return bit position of the resync_marker, or <0 if none was found
  */
 int ff_h263_resync(MpegEncContext *s){
@@ -306,7 +306,7 @@ int h263_decode_motion(MpegEncContext * s, int pred, int f_code)
 }
 
 
-/* Decodes RVLC of H.263+ UMV */
+/* Decode RVLC of H.263+ UMV */
 static int h263p_decode_umotion(MpegEncContext * s, int pred)
 {
    int code = 0, sign;

libavcodec/ituh263enc.c

@@ -302,7 +302,7 @@ void ff_clean_h263_qscales(MpegEncContext *s){
 static const int dquant_code[5]= {1,0,9,2,3};
 
 /**
- * encodes a 8x8 block.
+ * Encode an 8x8 block.
  * @param block the 8x8 block
  * @param n block index (0-3 are luma, 4-5 are chroma)
  */

libavcodec/latm_parser.c

@@ -36,7 +36,7 @@ typedef struct LATMParseContext{
 } LATMParseContext;
 
 /**
- * finds the end of the current frame in the bitstream.
+ * Find the end of the current frame in the bitstream.
  * @return the position of the first byte of the next frame, or -1
  */
 static int latm_find_frame_end(AVCodecParserContext *s1, const uint8_t *buf,

libavcodec/mjpeg_parser.c

@@ -30,7 +30,7 @@
 
 
 /**
- * finds the end of the current frame in the bitstream.
+ * Find the end of the current frame in the bitstream.
  * @return the position of the first byte of the next frame, or -1
  */
 static int find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size){

libavcodec/mpeg12.c

@@ -1619,9 +1619,10 @@ static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
 #define DECODE_SLICE_OK     0
 
 /**
- * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
- * @return DECODE_SLICE_ERROR if the slice is damaged<br>
- *         DECODE_SLICE_OK if this slice is ok<br>
+ * Decode a slice.
+ * MpegEncContext.mb_y must be set to the MB row from the startcode.
+ * @return DECODE_SLICE_ERROR if the slice is damaged,
+ *         DECODE_SLICE_OK if this slice is OK
  */
 static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
                              const uint8_t **buf, int buf_size)

libavcodec/mpeg4video.h

@@ -119,7 +119,7 @@ extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2*MAX_RUN + MAX_LEVEL + 3];
 
 
 /**
- * predicts the dc.
+ * Predict the dc.
  * encoding quantized level -> quantized diff
  * decoding quantized diff -> quantized level
  * @param n block index (0-3 are luma, 4-5 are chroma)

libavcodec/mpeg4video_parser.h

@@ -26,7 +26,7 @@
 #include "parser.h"
 
 /**
- * finds the end of the current frame in the bitstream.
+ * Find the end of the current frame in the bitstream.
  * @return the position of the first byte of the next frame, or -1
  */
 int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);

libavcodec/mpeg4videodec.c

@@ -46,7 +46,7 @@ static const int mb_type_b_map[4]= {
 };
 
 /**
- * predicts the ac.
+ * Predict the ac.
  * @param n block index (0-3 are luma, 4-5 are chroma)
  * @param dir the ac prediction direction
  */
@@ -343,7 +343,7 @@ static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb
 }
 
 /**
- * decodes the next video packet.
+ * Decode the next video packet.
  * @return <0 if something went wrong
  */
 int mpeg4_decode_video_packet_header(MpegEncContext *s)
@@ -439,7 +439,7 @@ int mpeg4_decode_video_packet_header(MpegEncContext *s)
 }
 
 /**
- * gets the average motion vector for a GMC MB.
+ * Get the average motion vector for a GMC MB.
  * @param n either 0 for the x component or 1 for y
  * @return the average MV for a GMC MB
  */
@@ -485,7 +485,7 @@ static inline int get_amv(MpegEncContext *s, int n){
 }
 
 /**
- * decodes the dc value.
+ * Decode the dc value.
  * @param n block index (0-3 are luma, 4-5 are chroma)
  * @param dir_ptr the prediction direction will be stored here
  * @return the quantized dc
@@ -532,7 +532,7 @@ static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
 }
 
 /**
- * decodes first partition.
+ * Decode first partition.
  * @return number of MBs decoded or <0 if an error occurred
  */
 static int mpeg4_decode_partition_a(MpegEncContext *s){
@@ -784,7 +784,7 @@ static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
 }
 
 /**
- * decodes the first & second partition
+ * Decode the first and second partition.
  * @return <0 if error (and sets error type in the error_status_table)
  */
 int ff_mpeg4_decode_partitions(MpegEncContext *s)
@@ -837,7 +837,7 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
 }
 
 /**
- * decodes a block.
+ * Decode a block.
  * @return <0 if an error occurred
  */
 static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
@@ -1824,7 +1824,7 @@ no_cplx_est:
 }
 
 /**
- * decodes the user data stuff in the header.
+ * Decode the user data stuff in the header.
  * Also initializes divx/xvid/lavc_version/build.
  */
 static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
@@ -2094,7 +2094,7 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
 }
 
 /**
- * decode mpeg4 headers
+ * Decode mpeg4 headers.
  * @return <0 if no VOP found (or a damaged one)
  *         FRAME_SKIPPED if a not coded VOP is found
  *         0 if a VOP is found

libavcodec/mpeg4videoenc.c

@@ -238,7 +238,7 @@ void ff_clean_mpeg4_qscales(MpegEncContext *s){
 
 
 /**
- * encodes the dc value.
+ * Encode the dc value.
  * @param n block index (0-3 are luma, 4-5 are chroma)
  */
 static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
@@ -291,7 +291,7 @@ static inline int mpeg4_get_dc_length(int level, int n){
 }
 
 /**
- * encodes a 8x8 block
+ * Encode an 8x8 block.
  * @param n block index (0-3 are luma, 4-5 are chroma)
  */
 static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,

libavcodec/mpegvideo.c

@@ -289,7 +289,7 @@ static int alloc_frame_buffer(MpegEncContext *s, Picture *pic)
 }
 
 /**
- * allocates a Picture
+ * Allocate a Picture.
  * The pixels are allocated/set by calling get_buffer() if shared = 0
  */
 int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared)
@@ -388,7 +388,7 @@ fail: // for  the FF_ALLOCZ_OR_GOTO macro
 }
 
 /**
- * deallocates a picture
+ * Deallocate a picture.
  */
 static void free_picture(MpegEncContext *s, Picture *pic)
 {
@@ -624,9 +624,9 @@ int ff_mpeg_update_thread_context(AVCodecContext *dst,
 }
 
 /**
- * sets the given MpegEncContext to common defaults
+ * Set the given MpegEncContext to common defaults
  * (same for encoding and decoding).
- * the changed fields will not depend upon the
+ * The changed fields will not depend upon the
  * prior state of the MpegEncContext.
  */
 void MPV_common_defaults(MpegEncContext *s)
@@ -652,7 +652,7 @@ void MPV_common_defaults(MpegEncContext *s)
 }
 
 /**
- * sets the given MpegEncContext to defaults for decoding.
+ * Set the given MpegEncContext to defaults for decoding.
  * the changed fields will not depend upon
  * the prior state of the MpegEncContext.
  */
@@ -1400,7 +1400,7 @@ void MPV_frame_end(MpegEncContext *s)
 }
 
 /**
- * draws an line from (ex, ey) -> (sx, sy).
+ * Draw a line from (ex, ey) -> (sx, sy).
  * @param w width of the image
  * @param h height of the image
  * @param stride stride/linesize of the image
@@ -1449,7 +1449,7 @@ static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h
 }
 
 /**
- * draws an arrow from (ex, ey) -> (sx, sy).
+ * Draw an arrow from (ex, ey) -> (sx, sy).
  * @param w width of the image
  * @param h height of the image
  * @param stride stride/linesize of the image
@@ -1482,7 +1482,7 @@ static void draw_arrow(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int
 }
 
 /**
- * prints debuging info for the given picture.
+ * Print debuging info for the given picture.
  */
 void ff_print_debug_info(MpegEncContext *s, AVFrame *pict){
 
@@ -2127,7 +2127,7 @@ static inline void add_dequant_dct(MpegEncContext *s,
 }
 
 /**
- * cleans dc, ac, coded_block for the current non intra MB
+ * Clean dc, ac, coded_block for the current non-intra MB.
  */
 void ff_clean_intra_table_entries(MpegEncContext *s)
 {
@@ -2432,7 +2432,6 @@ void MPV_decode_mb(MpegEncContext *s, DCTELEM block[12][64]){
 }
 
 /**
- *
  * @param h is the normal height, this will be reduced automatically if needed for the last row
  */
 void ff_draw_horiz_band(MpegEncContext *s, int y, int h){

libavcodec/mpegvideo.h

@@ -728,8 +728,8 @@ void ff_init_block_index(MpegEncContext *s);
 void ff_copy_picture(Picture *dst, Picture *src);
 
 /**
- * allocates a Picture
- * The pixels are allocated/set by calling get_buffer() if shared=0
+ * Allocate a Picture.
+ * The pixels are allocated/set by calling get_buffer() if shared = 0.
  */
 int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared);
 

libavcodec/mpegvideo_common.h

@@ -42,14 +42,14 @@
 int dct_quantize_c(MpegEncContext *s, DCTELEM *block, int n, int qscale, int *overflow);
 
 /**
- * allocates a Picture
- * The pixels are allocated/set by calling get_buffer() if shared=0
+ * Allocate a Picture.
+ * The pixels are allocated/set by calling get_buffer() if shared = 0.
  */
 int alloc_picture(MpegEncContext *s, Picture *pic, int shared);
 
 /**
- * sets the given MpegEncContext to common defaults (same for encoding and decoding).
- * the changed fields will not depend upon the prior state of the MpegEncContext.
+ * Set the given MpegEncContext to common defaults (same for encoding and decoding).
+ * The changed fields will not depend upon the prior state of the MpegEncContext.
  */
 void MPV_common_defaults(MpegEncContext *s);
 

libavcodec/mpegvideo_enc.c

@@ -227,7 +227,7 @@ static void update_duplicate_context_after_me(MpegEncContext *dst, MpegEncContex
 }
 
 /**
- * sets the given MpegEncContext to defaults for encoding.
+ * Set the given MpegEncContext to defaults for encoding.
  * the changed fields will not depend upon the prior state of the MpegEncContext.
  */
 static void MPV_encode_defaults(MpegEncContext *s){

libavcodec/parser.c

@@ -216,7 +216,7 @@ void av_parser_close(AVCodecParserContext *s)
 /*****************************************************/
 
 /**
- * combines the (truncated) bitstream to a complete frame
+ * Combine the (truncated) bitstream to a complete frame.
  * @return -1 if no complete frame could be created, AVERROR(ENOMEM) if there was a memory allocation error
  */
 int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size)

libavcodec/pthread.c

@@ -322,7 +322,7 @@ static attribute_align_arg void *frame_worker_thread(void *arg)
 }
 
 /**
- * Updates the next thread's AVCodecContext with values from the reference thread's context.
+ * Update the next thread's AVCodecContext with values from the reference thread's context.
  *
  * @param dst The destination context.
  * @param src The source context.

libavcodec/ratecontrol.c

@@ -300,7 +300,7 @@ int ff_vbv_update(MpegEncContext *s, int frame_size){
 }
 
 /**
- * modifies the bitrate curve from pass1 for one frame
+ * Modify the bitrate curve from pass1 for one frame.
  */
 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
     RateControlContext *rcc= &s->rc_context;
@@ -404,7 +404,7 @@ static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, doubl
 }
 
 /**
- * gets the qmin & qmax for pict_type
+ * Get the qmin & qmax for pict_type.
  */
 static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
     int qmin= s->avctx->lmin;

libavcodec/resample2.c

@@ -90,7 +90,7 @@ static double bessel(double x){
 }
 
 /**
- * builds a polyphase filterbank.
+ * Build a polyphase filterbank.
  * @param factor resampling factor
  * @param scale wanted sum of coefficients for each filter
  * @param type 0->cubic, 1->blackman nuttall windowed sinc, 2..16->kaiser windowed sinc beta=2..16

libavcodec/thread.h

@@ -31,15 +31,15 @@
 #include "avcodec.h"
 
 /**
- * Waits for decoding threads to finish and resets internal
- * state. Called by avcodec_flush_buffers().
+ * Wait for decoding threads to finish and reset internal state.
+ * Called by avcodec_flush_buffers().
  *
  * @param avctx The context.
  */
 void ff_thread_flush(AVCodecContext *avctx);
 
 /**
- * Submits a new frame to a decoding thread.
+ * Submit a new frame to a decoding thread.
  * Returns the next available frame in picture. *got_picture_ptr
  * will be 0 if none is available.
  * The return value on success is the size of the consumed packet for
@@ -62,8 +62,7 @@ int ff_thread_decode_frame(AVCodecContext *avctx, AVFrame *picture,
 void ff_thread_finish_setup(AVCodecContext *avctx);
 
 /**
- * Notifies later decoding threads when part of their reference picture
- * is ready.
+ * Notify later decoding threads when part of their reference picture is ready.
  * Call this when some part of the picture is finished decoding.
  * Later calls with lower values of progress have no effect.
  *
@@ -75,7 +74,7 @@ void ff_thread_finish_setup(AVCodecContext *avctx);
 void ff_thread_report_progress(AVFrame *f, int progress, int field);
 
 /**
- * Waits for earlier decoding threads to finish reference pictures
+ * Wait for earlier decoding threads to finish reference pictures.
  * Call this before accessing some part of a picture, with a given
  * value for progress, and it will return after the responsible decoding
  * thread calls ff_thread_report_progress() with the same or

libavcodec/vc1_parser.c

@@ -96,7 +96,7 @@ static void vc1_extract_headers(AVCodecParserContext *s, AVCodecContext *avctx,
 }
 
 /**
- * finds the end of the current frame in the bitstream.
+ * Find the end of the current frame in the bitstream.
  * @return the position of the first byte of the next frame, or -1
  */
 static int vc1_find_frame_end(ParseContext *pc, const uint8_t *buf,

libavfilter/avfilter.h

@@ -708,7 +708,7 @@ int avfilter_request_frame(AVFilterLink *link);
 int avfilter_poll_frame(AVFilterLink *link);
 
 /**
- * Notifie the next filter of the start of a frame.
+ * Notify the next filter of the start of a frame.
  *
  * @param link   the output link the frame will be sent over
  * @param picref A reference to the frame about to be sent. The data for this

libavformat/avformat.h

@@ -516,7 +516,7 @@ typedef struct AVInputFormat {
                                           int stream_index, int64_t timestamp, int flags);
 #endif
     /**
-     * Gets the next timestamp in stream[stream_index].time_base units.
+     * Get the next timestamp in stream[stream_index].time_base units.
      * @return the timestamp or AV_NOPTS_VALUE if an error occurred
      */
     int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,

libavformat/rtpdec_qdm2.c

@@ -52,8 +52,8 @@ struct PayloadContext {
 };
 
 /**
- * Parses configuration (basically the codec-specific extradata) from
- * a RTP config subpacket (starts with 0xff).
+ * Parse configuration (basically the codec-specific extradata) from
+ * an RTP config subpacket (starts with 0xff).
  *
  * Layout of the config subpacket (in bytes):
  * 1: 0xFF          <- config ID
@@ -128,7 +128,7 @@ static int qdm2_parse_config(PayloadContext *qdm, AVStream *st,
 }
 
 /**
- * Parses a single subpacket. We store this subpacket in an intermediate
+ * Parse a single subpacket. We store this subpacket in an intermediate
  * buffer (position depends on the ID (byte[0]). When called, at least
  * 4 bytes are available for reading (see qdm2_parse_packet()).
  *
@@ -179,7 +179,7 @@ static int qdm2_parse_subpacket(PayloadContext *qdm, AVStream *st,
 }
 
 /**
- * Adds a superblock header around a set of subpackets.
+ * Add a superblock header around a set of subpackets.
  *
  * @return <0 on error, else 0.
  */

libavformat/rtsp.h

@@ -186,7 +186,7 @@ enum RTSPClientState {
 };
 
 /**
- * Identifies particular servers that require special handling, such as
+ * Identify particular servers that require special handling, such as
  * standards-incompliant "Transport:" lines in the SETUP request.
  */
 enum RTSPServerType {
@@ -366,7 +366,7 @@ typedef struct RTSPState {
                                           source address and port. */
 
 /**
- * Describes a single stream, as identified by a single m= line block in the
+ * Describe a single stream, as identified by a single m= line block in the
  * SDP content. In the case of RDT, one RTSPStream can represent multiple
  * AVStreams. In this case, each AVStream in this set has similar content
  * (but different codec/bitrate).

libavformat/vorbiscomment.h

@@ -39,7 +39,7 @@ int ff_vorbiscomment_length(AVDictionary *m, const char *vendor_string,
                             unsigned *count);
 
 /**
- * Writes a VorbisComment into a buffer. The buffer, p, must have enough
+ * Write a VorbisComment into a buffer. The buffer, p, must have enough
  * data to hold the whole VorbisComment. The minimum size required can be
  * obtained by passing the same AVDictionary and vendor_string to
  * ff_vorbiscomment_length()

libavutil/avstring.h

@@ -137,7 +137,7 @@ char *av_d2str(double d);
 char *av_get_token(const char **buf, const char *term);
 
 /**
- * Locale independent conversion of ASCII characters to upper case.
+ * Locale-independent conversion of ASCII characters to uppercase.
  */
 static inline int av_toupper(int c)
 {
@@ -147,7 +147,7 @@ static inline int av_toupper(int c)
 }
 
 /**
- * Locale independent conversion of ASCII characters to lower case.
+ * Locale-independent conversion of ASCII characters to lowercase.
  */
 static inline int av_tolower(int c)
 {
@@ -157,13 +157,13 @@ static inline int av_tolower(int c)
 }
 
 /*
- * Locale independent case-insensitive compare.
+ * Locale-independent case-insensitive compare.
  * @note This means only ASCII-range characters are case-insensitive
  */
 int av_strcasecmp(const char *a, const char *b);
 
 /**
- * Locale independent case-insensitive compare.
+ * Locale-independent case-insensitive compare.
  * @note This means only ASCII-range characters are case-insensitive
  */
 int av_strncasecmp(const char *a, const char *b, size_t n);

libavutil/internal.h

@@ -221,7 +221,7 @@ struct AVDictionary {
 #endif
 
 /**
- * Returns NULL if a threading library has not been enabled.
+ * Return NULL if a threading library has not been enabled.
  * Used to disable threading functions in AVCodec definitions
  * when not needed.
  */

libavutil/parseutils.h

@@ -75,7 +75,7 @@ int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen,
                    void *log_ctx);
 
 /**
- * Parses timestr and returns in *time a corresponding number of
+ * Parse timestr and return in *time a corresponding number of
  * microseconds.
  *
  * @param timeval puts here the number of microseconds corresponding

libpostproc/postprocess.h

@@ -77,9 +77,10 @@ void  pp_postprocess(const uint8_t * src[3], const int srcStride[3],
 
 
 /**
- * returns a pp_mode or NULL if an error occurred
- * name is the string after "-pp" on the command line
- * quality is a number from 0 to PP_QUALITY_MAX
+ * Return a pp_mode or NULL if an error occurred.
+ *
+ * @param name    the string after "-pp" on the command line
+ * @param quality a number from 0 to PP_QUALITY_MAX
  */
 pp_mode *pp_get_mode_by_name_and_quality(const char *name, int quality);
 void pp_free_mode(pp_mode *mode);

libpostproc/postprocess_template.c

@@ -1912,7 +1912,7 @@ MEDIAN((%%REGd, %1), (%%REGd, %1, 2), (%0, %1, 8))
 
 #if HAVE_MMX
 /**
- * transposes and shift the given 8x8 Block into dst1 and dst2
+ * Transpose and shift the given 8x8 Block into dst1 and dst2.
  */
 static inline void RENAME(transpose1)(uint8_t *dst1, uint8_t *dst2, uint8_t *src, int srcStride)
 {
@@ -1997,7 +1997,7 @@ static inline void RENAME(transpose1)(uint8_t *dst1, uint8_t *dst2, uint8_t *src
 }
 
 /**
- * transposes the given 8x8 block
+ * Transpose the given 8x8 block.
  */
 static inline void RENAME(transpose2)(uint8_t *dst, int dstStride, uint8_t *src)
 {

libswscale/swscale.h

@@ -57,17 +57,17 @@
 #endif
 
 /**
- * Returns the LIBSWSCALE_VERSION_INT constant.
+ * Return the LIBSWSCALE_VERSION_INT constant.
  */
 unsigned swscale_version(void);
 
 /**
- * Returns the libswscale build-time configuration.
+ * Return the libswscale build-time configuration.
  */
 const char *swscale_configuration(void);
 
 /**
- * Returns the libswscale license.
+ * Return the libswscale license.
  */
 const char *swscale_license(void);
 
@@ -124,7 +124,7 @@ const char *swscale_license(void);
 #define SWS_CS_DEFAULT        5
 
 /**
- * Returns a pointer to yuv<->rgb coefficients for the given colorspace
+ * Return a pointer to yuv<->rgb coefficients for the given colorspace
  * suitable for sws_setColorspaceDetails().
  *
  * @param colorspace One of the SWS_CS_* macros. If invalid,
@@ -151,26 +151,26 @@ typedef struct {
 struct SwsContext;
 
 /**
- * Returns a positive value if pix_fmt is a supported input format, 0
+ * Return a positive value if pix_fmt is a supported input format, 0
  * otherwise.
  */
 int sws_isSupportedInput(enum PixelFormat pix_fmt);
 
 /**
- * Returns a positive value if pix_fmt is a supported output format, 0
+ * Return a positive value if pix_fmt is a supported output format, 0
  * otherwise.
  */
 int sws_isSupportedOutput(enum PixelFormat pix_fmt);
 
 /**
- * Allocates an empty SwsContext. This must be filled and passed to
+ * Allocate an empty SwsContext. This must be filled and passed to
  * sws_init_context(). For filling see AVOptions, options.c and
  * sws_setColorspaceDetails().
  */
 struct SwsContext *sws_alloc_context(void);
 
 /**
- * Initializes the swscaler context sws_context.
+ * Initialize the swscaler context sws_context.
  *
  * @return zero or positive value on success, a negative value on
  * error
@@ -178,14 +178,14 @@ struct SwsContext *sws_alloc_context(void);
 int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);
 
 /**
- * Frees the swscaler context swsContext.
+ * Free the swscaler context swsContext.
  * If swsContext is NULL, then does nothing.
  */
 void sws_freeContext(struct SwsContext *swsContext);
 
 #if FF_API_SWS_GETCONTEXT
 /**
- * Allocates and returns a SwsContext. You need it to perform
+ * Allocate and return an SwsContext. You need it to perform
  * scaling/conversion operations using sws_scale().
  *
  * @param srcW the width of the source image
@@ -207,7 +207,7 @@ struct SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat
 #endif
 
 /**
- * Scales the image slice in srcSlice and puts the resulting scaled
+ * Scale the image slice in srcSlice and put the resulting scaled
  * slice in the image in dst. A slice is a sequence of consecutive
  * rows in an image.
  *
@@ -252,35 +252,35 @@ int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
                              int *brightness, int *contrast, int *saturation);
 
 /**
- * Allocates and returns an uninitialized vector with length coefficients.
+ * Allocate and return an uninitialized vector with length coefficients.
  */
 SwsVector *sws_allocVec(int length);
 
 /**
- * Returns a normalized Gaussian curve used to filter stuff
- * quality=3 is high quality, lower is lower quality.
+ * Return a normalized Gaussian curve used to filter stuff
+ * quality = 3 is high quality, lower is lower quality.
  */
 SwsVector *sws_getGaussianVec(double variance, double quality);
 
 /**
- * Allocates and returns a vector with length coefficients, all
+ * Allocate and return a vector with length coefficients, all
  * with the same value c.
  */
 SwsVector *sws_getConstVec(double c, int length);
 
 /**
- * Allocates and returns a vector with just one coefficient, with
+ * Allocate and return a vector with just one coefficient, with
  * value 1.0.
  */
 SwsVector *sws_getIdentityVec(void);
 
 /**
- * Scales all the coefficients of a by the scalar value.
+ * Scale all the coefficients of a by the scalar value.
  */
 void sws_scaleVec(SwsVector *a, double scalar);
 
 /**
- * Scales all the coefficients of a so that their sum equals height.
+ * Scale all the coefficients of a so that their sum equals height.
  */
 void sws_normalizeVec(SwsVector *a, double height);
 void sws_convVec(SwsVector *a, SwsVector *b);
@@ -289,13 +289,13 @@ void sws_subVec(SwsVector *a, SwsVector *b);
 void sws_shiftVec(SwsVector *a, int shift);
 
 /**
- * Allocates and returns a clone of the vector a, that is a vector
+ * Allocate and return a clone of the vector a, that is a vector
  * with the same coefficients as a.
  */
 SwsVector *sws_cloneVec(SwsVector *a);
 
 /**
- * Prints with av_log() a textual representation of the vector a
+ * Print with av_log() a textual representation of the vector a
  * if log_level <= av_log_level.
  */
 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
@@ -309,8 +309,7 @@ SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
 void sws_freeFilter(SwsFilter *filter);
 
 /**
- * Checks if context can be reused, otherwise reallocates a new
- * one.
+ * Check if context can be reused, otherwise reallocate a new one.
  *
  * If context is NULL, just calls sws_getContext() to get a new
  * context. Otherwise, checks if the parameters are the ones already
@@ -328,7 +327,7 @@ struct SwsContext *sws_getCachedContext(struct SwsContext *context,
                                         SwsFilter *dstFilter, const double *param);
 
 /**
- * Converts an 8bit paletted frame into a frame with a color depth of 32-bits.
+ * Convert an 8-bit paletted frame into a frame with a color depth of 32 bits.
  *
  * The output frame will have the same packed format as the palette.
  *
@@ -340,7 +339,7 @@ struct SwsContext *sws_getCachedContext(struct SwsContext *context,
 void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
 
 /**
- * Converts an 8bit paletted frame into a frame with a color depth of 24 bits.
+ * Convert an 8-bit paletted frame into a frame with a color depth of 24 bits.
  *
  * With the palette format "ABCD", the destination frame ends up with the format "ABC".
  *

libswscale/swscale_internal.h

@@ -625,7 +625,7 @@ extern const uint64_t ff_dither8[2];
 extern const AVClass sws_context_class;
 
 /**
- * Sets c->swScale to an unscaled converter if one exists for the specific
+ * Set c->swScale to an unscaled converter if one exists for the specific
  * source and destination formats, bit depths, flags, etc.
  */
 void ff_get_unscaled_swscale(SwsContext *c);
@@ -633,7 +633,7 @@ void ff_get_unscaled_swscale(SwsContext *c);
 void ff_swscale_get_unscaled_altivec(SwsContext *c);
 
 /**
- * Returns function pointer to fastest main scaler path function depending
+ * Return function pointer to fastest main scaler path function depending
  * on architecture and available optimizations.
  */
 SwsFunc ff_getSwsFunc(SwsContext *c);

tests/audiogen.c

@@ -1,6 +1,6 @@
 /*
- * Generates a synthetic stereo sound
- * NOTE: No floats are used to guarantee a bit exact output.
+ * Generate a synthetic stereo sound.
+ * NOTE: No floats are used to guarantee bitexact output.
  *
  * Copyright (c) 2002 Fabrice Bellard
  *

tests/rotozoom.c

@@ -1,5 +1,5 @@
 /*
- * Generates a synthetic YUV video sequence suitable for codec testing.
+ * Generate a synthetic YUV video sequence suitable for codec testing.
  *
  * copyright (c) Sebastien Bechet <s.bechet@av7.net>
  *

tests/videogen.c

@@ -1,6 +1,6 @@
 /*
- * Generates a synthetic YUV video sequence suitable for codec testing.
- * NOTE: No floats are used to guarantee a bit exact output.
+ * Generate a synthetic YUV video sequence suitable for codec testing.
+ * NOTE: No floats are used to guarantee bitexact output.
  *
  * Copyright (c) 2002 Fabrice Bellard
  *