From 4f57fa8c030eecd7bee94834151f4c7db697f70e Mon Sep 17 00:00:00 2001 From: Diego Biurrun Date: Sat, 27 Sep 2008 19:51:53 +0000 Subject: [PATCH] spelling/wording/grammar Originally committed as revision 15440 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/avformat.h | 312 +++++++++++++++++++++++++------------------------ 1 file changed, 158 insertions(+), 154 deletions(-) diff --git a/libavformat/avformat.h b/libavformat/avformat.h index 89b3b2f..2116f47 100644 --- a/libavformat/avformat.h +++ b/libavformat/avformat.h @@ -50,18 +50,18 @@ unsigned avformat_version(void); typedef struct AVPacket { /** - * Presentation time stamp in time_base units. + * Presentation timestamp in time_base units. * This is the time at which the decompressed packet will be presented * to the user. * Can be AV_NOPTS_VALUE if it is not stored in the file. - * pts MUST be larger or equal to dts as presentation can not happen before + * pts MUST be larger or equal to dts as presentation cannot happen before * decompression, unless one wants to view hex dumps. Some formats misuse * the terms dts and pts/cts to mean something different, these timestamps * must be converted to true pts/dts before they are stored in AVPacket. */ int64_t pts; /** - * Decompression time stamp in time_base units. + * Decompression timestamp in time_base units. * This is the time at which the packet is decompressed. * Can be AV_NOPTS_VALUE if it is not stored in the file. */ @@ -80,17 +80,17 @@ typedef struct AVPacket { int64_t pos; ///< byte position in stream, -1 if unknown /** - * This is the time difference in stream timebase units from the pts of this + * Time difference in stream time base units from the pts of this * packet to the point at which the output from the decoder has converged - * independent from the availability - * of previous frames (that is the frames are virtually identical no matter - * if decoding started from the very first frame or from this keyframe). - * is AV_NOPTS_VALUE if unknown. + * independent from the availability of previous frames. That is, the + * frames are virtually identical no matter if decoding started from + * the very first frame or from this keyframe. + * Is AV_NOPTS_VALUE if unknown. * This field is not the display duration of the current packet. * * The purpose of this field is to allow seeking in streams that have no * keyframes in the conventional sense. It corresponds to the - * recovery point SEI in H.264 and match_time_delta in nut. It also is + * recovery point SEI in H.264 and match_time_delta in NUT. It is also * essential for some types of subtitle streams to ensure that all * subtitles are correctly displayed after seeking. */ @@ -106,38 +106,40 @@ void av_destruct_packet_nofree(AVPacket *pkt); void av_destruct_packet(AVPacket *pkt); /** - * Initialize optional fields of a packet to default values. + * Initialize optional fields of a packet with default values. * * @param pkt packet */ void av_init_packet(AVPacket *pkt); /** - * Allocate the payload of a packet and initialize its fields to default values. + * Allocate the payload of a packet and initialize its fields with + * default values. * * @param pkt packet * @param size wanted payload size - * @return 0 if OK. AVERROR_xxx otherwise. + * @return 0 if OK, AVERROR_xxx otherwise */ int av_new_packet(AVPacket *pkt, int size); /** - * Allocate and read the payload of a packet and initialize its fields to default values. + * Allocate and read the payload of a packet and initialize its fields with + * default values. * * @param pkt packet - * @param size wanted payload size - * @return >0 (read size) if OK. AVERROR_xxx otherwise. + * @param size desired payload size + * @return >0 (read size) if OK, AVERROR_xxx otherwise */ int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size); /** * @warning This is a hack - the packet memory allocation stuff is broken. The - * packet is allocated if it was not really allocated + * packet is allocated if it was not really allocated. */ int av_dup_packet(AVPacket *pkt); /** - * Free a packet + * Free a packet. * * @param pkt packet to free */ @@ -152,9 +154,9 @@ static inline void av_free_packet(AVPacket *pkt) /* fractional numbers for exact pts handling */ /** - * the exact value of the fractional number is: 'val + num / den'. - * num is assumed to be such as 0 <= num < den - * @deprecated Use AVRational instead + * The exact value of the fractional number is: 'val + num / den'. + * num is assumed to be 0 <= num < den. + * @deprecated Use AVRational instead. */ typedef struct AVFrac { int64_t val, num, den; @@ -167,14 +169,14 @@ struct AVCodecTag; struct AVFormatContext; -/** this structure contains the data a format has to probe a file */ +/** This structure contains the data a format has to probe a file. */ typedef struct AVProbeData { const char *filename; unsigned char *buf; int buf_size; } AVProbeData; -#define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection +#define AVPROBE_SCORE_MAX 100 ///< Maximum score, half of that is used for file-extension-based detection. #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer typedef struct AVFormatParameters { @@ -184,14 +186,14 @@ typedef struct AVFormatParameters { int width; int height; enum PixelFormat pix_fmt; - int channel; /**< used to select dv channel */ - const char *standard; /**< tv standard, NTSC, PAL, SECAM */ - unsigned int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */ - unsigned int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport + int channel; /**< Used to select DV channel. */ + const char *standard; /**< TV standard, NTSC, PAL, SECAM */ + unsigned int mpeg2ts_raw:1; /**< Force raw MPEG-2 transport stream output, if possible. */ + unsigned int mpeg2ts_compute_pcr:1; /**< Compute exact PCR for each transport stream packet (only meaningful if - mpeg2ts_raw is TRUE) */ - unsigned int initial_pause:1; /**< do not begin to play the stream - immediately (RTSP only) */ + mpeg2ts_raw is TRUE). */ + unsigned int initial_pause:1; /**< Do not begin to play the stream + immediately (RTSP only). */ unsigned int prealloced_context:1; #if LIBAVFORMAT_VERSION_INT < (53<<16) enum CodecID video_codec_id; @@ -199,16 +201,16 @@ typedef struct AVFormatParameters { #endif } AVFormatParameters; -//! demuxer will use url_fopen, no opened file should be provided by the caller +//! Demuxer will use url_fopen, no opened file should be provided by the caller. #define AVFMT_NOFILE 0x0001 -#define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */ -#define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */ -#define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for - raw picture data */ -#define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */ -#define AVFMT_NOTIMESTAMPS 0x0080 /**< format does not need / have any timestamps */ -#define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */ -#define AVFMT_TS_DISCONT 0x0200 /**< format allows timestamo discontinuities */ +#define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */ +#define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */ +#define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for + raw picture data. */ +#define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */ +#define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */ +#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */ +#define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. */ typedef struct AVOutputFormat { const char *name; @@ -219,8 +221,8 @@ typedef struct AVOutputFormat { */ const char *long_name; const char *mime_type; - const char *extensions; /**< comma separated filename extensions */ - /** size of private data so that it can be allocated in the wrapper */ + const char *extensions; /**< comma-separated filename extensions */ + /** Size of private data so that it can be allocated in the wrapper. */ int priv_data_size; /* output support */ enum CodecID audio_codec; /**< default audio codec */ @@ -230,7 +232,7 @@ typedef struct AVOutputFormat { int (*write_trailer)(struct AVFormatContext *); /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */ int flags; - /** currently only used to set pixel format if not YUV420P */ + /** Currently only used to set pixel format if not YUV420P. */ int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *); int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush); @@ -254,7 +256,7 @@ typedef struct AVInputFormat { * to define it. */ const char *long_name; - /** size of private data so that it can be allocated in the wrapper */ + /** Size of private data so that it can be allocated in the wrapper. */ int priv_data_size; /** * Tell if a given file has a chance of being parsed by this format. @@ -262,22 +264,22 @@ typedef struct AVInputFormat { * big so you do not have to check for that unless you need more. */ int (*read_probe)(AVProbeData *); - /** read the format header and initialize the AVFormatContext - structure. Return 0 if OK. 'ap' if non NULL contains - additional paramters. Only used in raw format right + /** Read the format header and initialize the AVFormatContext + structure. Return 0 if OK. 'ap' if non-NULL contains + additional parameters. Only used in raw format right now. 'av_new_stream' should be called to create new streams. */ int (*read_header)(struct AVFormatContext *, AVFormatParameters *ap); - /** read one packet and put it in 'pkt'. pts and flags are also + /** Read one packet and put it in 'pkt'. pts and flags are also set. 'av_new_stream' can be called only if the flag AVFMTCTX_NOHEADER is used. */ int (*read_packet)(struct AVFormatContext *, AVPacket *pkt); - /** close the stream. The AVFormatContext and AVStreams are not + /** Close the stream. The AVFormatContext and AVStreams are not freed by this function */ int (*read_close)(struct AVFormatContext *); /** - * seek to a given timestamp relative to the frames in - * stream component stream_index + * Seek to a given timestamp relative to the frames in + * stream component stream_index. * @param stream_index must not be -1 * @param flags selects which direction should be preferred if no exact * match is available @@ -286,26 +288,26 @@ typedef struct AVInputFormat { int (*read_seek)(struct AVFormatContext *, int stream_index, int64_t timestamp, int flags); /** - * gets the next timestamp in stream[stream_index].time_base units. + * Gets 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, int64_t *pos, int64_t pos_limit); - /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */ + /** Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER. */ int flags; - /** if extensions are defined, then no probe is done. You should + /** If extensions are defined, then no probe is done. You should usually not use extension format guessing because it is not reliable enough */ const char *extensions; - /** general purpose read only value that the format can use */ + /** General purpose read-only value that the format can use. */ int value; - /** start/resume playing - only meaningful if using a network based format - (RTSP) */ + /** Start/resume playing - only meaningful if using a network-based format + (RTSP). */ int (*read_play)(struct AVFormatContext *); - /** pause playing - only meaningful if using a network based format - (RTSP) */ + /** Pause playing - only meaningful if using a network-based format + (RTSP). */ int (*read_pause)(struct AVFormatContext *); const struct AVCodecTag * const *codec_tag; @@ -317,7 +319,7 @@ typedef struct AVInputFormat { enum AVStreamParseType { AVSTREAM_PARSE_NONE, AVSTREAM_PARSE_FULL, /**< full parsing and repack */ - AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */ + AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */ AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */ }; @@ -326,8 +328,8 @@ typedef struct AVIndexEntry { int64_t timestamp; #define AVINDEX_KEYFRAME 0x0001 int flags:2; - int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs 32 byte due to possible 8byte align). - int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */ + int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment). + int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */ } AVIndexEntry; #define AV_DISPOSITION_DEFAULT 0x0001 @@ -346,37 +348,36 @@ typedef struct AVIndexEntry { */ typedef struct AVStream { int index; /**< stream index in AVFormatContext */ - int id; /**< format specific stream id */ + int id; /**< format-specific stream ID */ AVCodecContext *codec; /**< codec context */ /** * Real base frame rate of the stream. * This is the lowest frame rate with which all timestamps can be * represented accurately (it is the least common multiple of all - * frame rates in the stream), Note, this value is just a guess! - * For example if the timebase is 1/90000 and all frames have either - * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1. + * frame rates in the stream). Note, this value is just a guess! + * For example if the time base is 1/90000 and all frames have either + * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1. */ AVRational r_frame_rate; void *priv_data; /* internal data used in av_find_stream_info() */ int64_t first_dts; - /** encoding: PTS generation when outputing stream */ + /** encoding: pts generation when outputting stream */ struct AVFrac pts; /** * This is the fundamental unit of time (in seconds) in terms * of which frame timestamps are represented. For fixed-fps content, - * timebase should be 1/frame rate and timestamp increments should be - * identically 1. + * time base should be 1/frame rate and timestamp increments should be 1. */ AVRational time_base; int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */ /* ffmpeg.c private use */ - int stream_copy; /**< if set, just copy stream */ - enum AVDiscard discard; ///< selects which packets can be discarded at will and do not need to be demuxed + int stream_copy; /**< If set, just copy stream. */ + enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed. //FIXME move stuff to a flags field? - /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame + /** Quality, as it has been removed from AVCodecContext and put in AVVideoFrame. * MN: dunno if that is the right place for it */ float quality; /** @@ -391,7 +392,7 @@ typedef struct AVStream { /** * Decoding: duration of the stream, in stream time base. * If a source file does not specify a duration, but does specify - * a bitrate, this value will be estimates from bit rate and file size. + * a bitrate, this value will be estimated from bitrate and file size. */ int64_t duration; @@ -405,8 +406,8 @@ typedef struct AVStream { int last_IP_duration; int64_t last_IP_pts; /* av_seek_frame() support */ - AVIndexEntry *index_entries; /**< only used if the format does not - support seeking natively */ + AVIndexEntry *index_entries; /**< Only used if the format does not + support seeking natively. */ int nb_index_entries; unsigned int index_entries_allocated_size; @@ -418,7 +419,7 @@ typedef struct AVStream { char *filename; /**< source filename of the stream */ - int disposition; /**< AV_DISPOSITION_* bitfield */ + int disposition; /**< AV_DISPOSITION_* bit field */ AVProbeData probe_data; #define MAX_REORDER_DELAY 16 @@ -442,8 +443,8 @@ typedef struct AVStream { */ typedef struct AVProgram { int id; - char *provider_name; ///< Network name for DVB streams - char *name; ///< Service name for DVB streams + char *provider_name; ///< network name for DVB streams + char *name; ///< service name for DVB streams int flags; enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller unsigned int *stream_index; @@ -454,8 +455,8 @@ typedef struct AVProgram { (streams are added dynamically) */ typedef struct AVChapter { - int id; ///< Unique id to identify the chapter - AVRational time_base; ///< Timebase in which the start/end timestamps are specified + int id; ///< unique ID to identify the chapter + AVRational time_base; ///< time base in which the start/end timestamps are specified int64_t start, end; ///< chapter start/end time in time_base units char *title; ///< chapter title } AVChapter; @@ -463,15 +464,15 @@ typedef struct AVChapter { #define MAX_STREAMS 20 /** - * format I/O context. + * Format I/O context. * New fields can be added to the end with minor version bumps. * Removal, reordering and changes to existing fields require a major * version bump. * sizeof(AVFormatContext) must not be used outside libav*. */ typedef struct AVFormatContext { - const AVClass *av_class; /**< set by av_alloc_format_context */ - /* can only be iformat or oformat, not both at the same time */ + const AVClass *av_class; /**< Set by av_alloc_format_context. */ + /* Can only be iformat or oformat, not both at the same time. */ struct AVInputFormat *iformat; struct AVOutputFormat *oformat; void *priv_data; @@ -490,24 +491,24 @@ typedef struct AVFormatContext { int track; /**< track number, 0 if none */ char genre[32]; /**< ID3 genre */ - int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */ - /* private data for pts handling (do not modify directly) */ + int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */ + /* private data for pts handling (do not modify directly). */ /** This buffer is only needed when packets were already buffered but - not decoded, for example to get the codec parameters in mpeg - streams */ + not decoded, for example to get the codec parameters in MPEG + streams. */ struct AVPacketList *packet_buffer; - /** decoding: position of the first frame of the component, in + /** Decoding: position of the first frame of the component, in AV_TIME_BASE fractional seconds. NEVER set this value directly: - it is deduced from the AVStream values. */ + It is deduced from the AVStream values. */ int64_t start_time; - /** decoding: duration of the stream, in AV_TIME_BASE fractional + /** Decoding: duration of the stream, in AV_TIME_BASE fractional seconds. NEVER set this value directly: it is deduced from the AVStream values. */ int64_t duration; - /** decoding: total file size. 0 if unknown */ + /** decoding: total file size, 0 if unknown */ int64_t file_size; - /** decoding: total stream bitrate in bit/s, 0 if not + /** Decoding: total stream bitrate in bit/s, 0 if not available. Never set it directly if the file_size and the duration are known as ffmpeg can compute it automatically. */ int bit_rate; @@ -533,16 +534,17 @@ typedef struct AVFormatContext { int loop_output; int flags; -#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames -#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index -#define AVFMT_FLAG_NONBLOCK 0x0004 ///< do not block when reading packets from input +#define AVFMT_FLAG_GENPTS 0x0001 ///< Generate pts if missing even if it requires parsing future frames. +#define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index. +#define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input. int loop_input; - /** decoding: size of data to probe; encoding unused */ + /** Decoding: size of data to probe; encoding: unused. */ unsigned int probesize; /** - * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info() + * Maximum time (in AV_TIME_BASE units) during which the input should + * be analyzed in av_find_stream_info(). */ int max_analyze_duration; @@ -554,26 +556,26 @@ typedef struct AVFormatContext { /** * Forced video codec_id. - * demuxing: set by user + * Demuxing: Set by user. */ enum CodecID video_codec_id; /** * Forced audio codec_id. - * demuxing: set by user + * Demuxing: Set by user. */ enum CodecID audio_codec_id; /** * Forced subtitle codec_id. - * demuxing: set by user + * Demuxing: Set by user. */ enum CodecID subtitle_codec_id; /** * Maximum amount of memory in bytes to use per stream for the index. - * If the needed index exceeds this size entries will be discarded as + * If the needed index exceeds this size, entries will be discarded as * needed to maintain a smaller size. This can lead to slower or less * accurate seeking (depends on demuxer). - * Demuxers for which a full in memory index is mandatory will ignore + * Demuxers for which a full in-memory index is mandatory will ignore * this. * muxing : unused * demuxing: set by user @@ -582,7 +584,7 @@ typedef struct AVFormatContext { /** * Maximum amount of memory in bytes to use for buffering frames - * obtained from real-time capture devices. + * obtained from realtime capture devices. */ unsigned int max_picture_buffer; @@ -590,13 +592,13 @@ typedef struct AVFormatContext { AVChapter **chapters; /** - * Flags to enable debuging. + * Flags to enable debugging. */ int debug; #define FF_FDEBUG_TS 0x0001 /** - * raw packets from the demuxer, prior to parsing and decoding. + * Raw packets from the demuxer, prior to parsing and decoding. * This buffer is used for buffering packets until the codec can * be identified, as parsing cannot be done without knowing the * codec. @@ -634,7 +636,7 @@ AVOutputFormat *guess_format(const char *short_name, const char *filename, const char *mime_type); /** - * Guesses the codec id based upon muxer and filename. + * Guesses the codec ID based upon muxer and filename. */ enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name, const char *filename, const char *mime_type, enum CodecType type); @@ -669,7 +671,7 @@ void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size); * * @param f The file stream pointer where the dump should be sent to. * @param pkt packet to dump - * @param dump_payload true if the payload must be displayed too + * @param dump_payload True if the payload must be displayed, too. */ void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload); @@ -681,7 +683,7 @@ void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload); * @param level The importance level of the message, lower values signifying * higher importance. * @param pkt packet to dump - * @param dump_payload true if the payload must be displayed too + * @param dump_payload True if the payload must be displayed, too. */ void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload); @@ -694,15 +696,15 @@ unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id); /* media file input */ /** - * finds AVInputFormat based on input format's short name. + * Finds AVInputFormat based on the short name of the input format. */ AVInputFormat *av_find_input_format(const char *short_name); /** * Guess file format. * - * @param is_opened whether the file is already opened, determines whether - * demuxers with or without AVFMT_NOFILE are probed + * @param is_opened Whether the file is already opened; determines whether + * demuxers with or without AVFMT_NOFILE are probed. */ AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened); @@ -718,12 +720,12 @@ int av_open_input_stream(AVFormatContext **ic_ptr, * Open a media file as input. The codecs are not opened. Only the file * header (if present) is read. * - * @param ic_ptr the opened media file handle is put here - * @param filename filename to open. - * @param fmt if non NULL, force the file format to use + * @param ic_ptr The opened media file handle is put here. + * @param filename filename to open + * @param fmt If non-NULL, force the file format to use. * @param buf_size optional buffer size (zero if default is OK) - * @param ap additional parameters needed when opening the file (NULL if default) - * @return 0 if OK. AVERROR_xxx otherwise. + * @param ap Additional parameters needed when opening the file (NULL if default). + * @return 0 if OK, AVERROR_xxx otherwise */ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename, AVInputFormat *fmt, @@ -739,14 +741,15 @@ AVFormatContext *av_alloc_format_context(void); /** * Read packets of a media file to get stream information. This * is useful for file formats with no headers such as MPEG. This - * function also computes the real frame rate in case of mpeg2 repeat + * function also computes the real frame rate in case of MPEG-2 repeat * frame mode. * The logical file position is not changed by this function; * examined packets may be buffered for later processing. * * @param ic media file handle - * @return >=0 if OK. AVERROR_xxx if error. - * @todo Let user decide somehow what information is needed so we do not waste time getting stuff the user does not need. + * @return >=0 if OK, AVERROR_xxx on error + * @todo Let the user decide somehow what information is needed so that + * we do not waste time getting stuff the user does not need. */ int av_find_stream_info(AVFormatContext *ic); @@ -758,7 +761,7 @@ int av_find_stream_info(AVFormatContext *ic); * * @param s media file handle * @param pkt is filled - * @return 0 if OK. AVERROR_xxx if error. + * @return 0 if OK, AVERROR_xxx on error */ int av_read_packet(AVFormatContext *s, AVPacket *pkt); @@ -775,11 +778,11 @@ int av_read_packet(AVFormatContext *s, AVPacket *pkt); * * pkt->pts, pkt->dts and pkt->duration are always set to correct * values in AVStream.timebase units (and guessed if the format cannot - * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format - * has B frames, so it is better to rely on pkt->dts if you do not + * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format + * has B-frames, so it is better to rely on pkt->dts if you do not * decompress the payload. * - * @return 0 if OK, < 0 if error or end of file. + * @return 0 if OK, < 0 on error or end of file */ int av_read_frame(AVFormatContext *s, AVPacket *pkt); @@ -789,16 +792,16 @@ int av_read_frame(AVFormatContext *s, AVPacket *pkt); * @param stream_index If stream_index is (-1), a default * stream is selected, and timestamp is automatically converted * from AV_TIME_BASE units to the stream specific time_base. - * @param timestamp timestamp in AVStream.time_base units - * or if there is no stream specified then in AV_TIME_BASE units + * @param timestamp Timestamp in AVStream.time_base units + * or, if no stream is specified, in AV_TIME_BASE units. * @param flags flags which select direction and seeking mode * @return >= 0 on success */ int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags); /** - * start playing a network based stream (e.g. RTSP stream) at the - * current position + * Start playing a network based stream (e.g. RTSP stream) at the + * current position. */ int av_read_play(AVFormatContext *s); @@ -830,7 +833,7 @@ void av_close_input_file(AVFormatContext *s); * can be added in read_packet too. * * @param s media file handle - * @param id file format dependent stream id + * @param id file-format-dependent stream ID */ AVStream *av_new_stream(AVFormatContext *s, int id); AVProgram *av_new_program(AVFormatContext *s, int id); @@ -838,15 +841,15 @@ AVProgram *av_new_program(AVFormatContext *s, int id); /** * Add a new chapter. * This function is NOT part of the public API - * and should be ONLY used by demuxers. + * and should ONLY be used by demuxers. * * @param s media file handle - * @param id unique id for this chapter + * @param id unique ID for this chapter * @param start chapter start time in time_base units * @param end chapter end time in time_base units * @param title chapter title * - * @return AVChapter or NULL if error. + * @return AVChapter or NULL on error */ AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title); @@ -864,15 +867,15 @@ void av_set_pts_info(AVStream *s, int pts_wrap_bits, #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes -#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes +#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes int av_find_default_stream_index(AVFormatContext *s); /** * Gets the index for a specific timestamp. - * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to - * the timestamp which is <= the requested one, if backward is 0 - * then it will be >= + * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond + * to the timestamp which is <= the requested one, if backward + * is 0, then it will be >= * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise * @return < 0 if no such timestamp could be found */ @@ -888,9 +891,10 @@ int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags); void ff_reduce_index(AVFormatContext *s, int stream_index); /** - * Add a index entry into a sorted list updateing if it is already there. + * Add an index entry into a sorted list. Update the entry if the list + * already contains it. * - * @param timestamp timestamp in the timebase of the given stream + * @param timestamp timestamp in the time base of the given stream */ int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags); @@ -904,10 +908,10 @@ int av_add_index_entry(AVStream *st, int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags); /** - * Updates cur_dts of all streams based on given timestamp and AVStream. + * Updates cur_dts of all streams based on the given timestamp and AVStream. * - * Stream ref_st unchanged, others set cur_dts in their native timebase - * only needed for timestamp wrapping or if (dts not set and pts!=dts). + * Stream ref_st unchanged, others set cur_dts in their native time base. + * Only needed for timestamp wrapping or if (dts not set and pts!=dts). * @param timestamp new dts expressed in time_base of param ref_st * @param ref_st reference stream giving time_base of param timestamp */ @@ -929,7 +933,7 @@ int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap); * output media file. * * @param s media file handle - * @return 0 if OK. AVERROR_xxx if error. + * @return 0 if OK, AVERROR_xxx on error */ int av_write_header(AVFormatContext *s); @@ -938,11 +942,11 @@ int av_write_header(AVFormatContext *s); * * The packet shall contain one audio or video frame. * The packet must be correctly interleaved according to the container specification, - * if not then av_interleaved_write_frame must be used + * if not then av_interleaved_write_frame must be used. * * @param s media file handle * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ... - * @return < 0 if error, = 0 if OK, 1 if end of stream wanted. + * @return < 0 on error, = 0 if OK, 1 if end of stream wanted */ int av_write_frame(AVFormatContext *s, AVPacket *pkt); @@ -958,12 +962,12 @@ int av_write_frame(AVFormatContext *s, AVPacket *pkt); * * @param s media file handle * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ... - * @return < 0 if error, = 0 if OK, 1 if end of stream wanted. + * @return < 0 on error, = 0 if OK, 1 if end of stream wanted */ int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt); /** - * Interleave a packet per DTS in an output media file. + * Interleave a packet per dts in an output media file. * * Packets with pkt->destruct == av_destruct_packet will be freed inside this function, * so they cannot be used after it, note calling av_free_packet() on them is still safe. @@ -985,7 +989,7 @@ int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pk * May only be called after a successful call to av_write_header. * * @param s media file handle - * @return 0 if OK. AVERROR_xxx if error. + * @return 0 if OK, AVERROR_xxx on error */ int av_write_trailer(AVFormatContext *s); @@ -995,7 +999,7 @@ void dump_format(AVFormatContext *ic, int is_output); /** - * parses width and height out of string str. + * Parses width and height out of string str. * @deprecated Use av_parse_video_frame_size instead. */ attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str); @@ -1013,9 +1017,9 @@ attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, * @code * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]} * @endcode - * Time is localtime unless Z is appended, in which case it is + * Time is local time unless Z is appended, in which case it is * interpreted as UTC. - * If the year-month-day part isn't specified it takes the current + * If the year-month-day part is not specified it takes the current * year-month-day. * Returns the number of microseconds since 1st of January, 1970 up to * the time of the parsed date or INT64_MIN if \p datestr cannot be @@ -1037,7 +1041,7 @@ int64_t parse_date(const char *datestr, int duration); /** Gets the current time in microseconds. */ int64_t av_gettime(void); -/* ffm specific for ffserver */ +/* ffm-specific for ffserver */ #define FFM_PACKET_SIZE 4096 offset_t ffm_read_write_index(int fd); void ffm_write_write_index(int fd, offset_t pos); @@ -1053,7 +1057,7 @@ int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info); /** * Returns in 'buf' the path with '%d' replaced by number. - + * * Also handles the '%0nd' format where 'n' is the total number * of digits and '%%'. * @@ -1061,7 +1065,7 @@ int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info); * @param buf_size destination buffer size * @param path numbered sequence string * @param number frame number - * @return 0 if OK, -1 if format error. + * @return 0 if OK, -1 on format error */ int av_get_frame_filename(char *buf, int buf_size, const char *path, int number); @@ -1070,7 +1074,7 @@ int av_get_frame_filename(char *buf, int buf_size, * Check whether filename actually is a numbered sequence generator. * * @param filename possible numbered sequence string - * @return 1 if a valid numbered sequence string, 0 otherwise. + * @return 1 if a valid numbered sequence string, 0 otherwise */ int av_filename_number_test(const char *filename); @@ -1081,12 +1085,12 @@ int av_filename_number_test(const char *filename); * array is composed by only one context, such context can contain * multiple AVStreams (one AVStream per RTP stream). Otherwise, * all the contexts in the array (an AVCodecContext per RTP stream) - * must contain only one AVStream + * must contain only one AVStream. * @param n_files number of AVCodecContexts contained in ac * @param buff buffer where the SDP will be stored (must be allocated by - * the caller + * the caller) * @param size the size of the buffer - * @return 0 if OK. AVERROR_xxx if error. + * @return 0 if OK, AVERROR_xxx on error */ int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size); -- 2.7.4