[FFmpeg-soc] [soc]: r3669 - mxf/avformat.h
spyfeng
subversion at mplayerhq.hu
Fri Aug 29 18:19:46 CEST 2008
Author: spyfeng
Date: Fri Aug 29 18:19:45 2008
New Revision: 3669
Log:
add libavformat/avformat.h as base into svn soc, we will modify it.
Added:
mxf/avformat.h
Added: mxf/avformat.h
==============================================================================
--- (empty file)
+++ mxf/avformat.h Fri Aug 29 18:19:45 2008
@@ -0,0 +1,1106 @@
+/*
+ * copyright (c) 2001 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef FFMPEG_AVFORMAT_H
+#define FFMPEG_AVFORMAT_H
+
+#define LIBAVFORMAT_VERSION_MAJOR 52
+#define LIBAVFORMAT_VERSION_MINOR 21
+#define LIBAVFORMAT_VERSION_MICRO 0
+
+#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
+ LIBAVFORMAT_VERSION_MINOR, \
+ LIBAVFORMAT_VERSION_MICRO)
+#define LIBAVFORMAT_VERSION AV_VERSION(LIBAVFORMAT_VERSION_MAJOR, \
+ LIBAVFORMAT_VERSION_MINOR, \
+ LIBAVFORMAT_VERSION_MICRO)
+#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
+
+#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
+/**
+ * Returns the LIBAVFORMAT_VERSION_INT constant.
+ */
+unsigned avformat_version(void);
+
+#include <time.h>
+#include <stdio.h> /* FILE */
+#include "libavcodec/avcodec.h"
+
+#include "avio.h"
+
+/* packet functions */
+
+typedef struct AVPacket {
+ /**
+ * Presentation time stamp 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
+ * 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.
+ * This is the time at which the packet is decompressed.
+ * Can be AV_NOPTS_VALUE if it is not stored in the file.
+ */
+ int64_t dts;
+ uint8_t *data;
+ int size;
+ int stream_index;
+ int flags;
+ int duration; ///< presentation duration in time_base units (0 if not available)
+ void (*destruct)(struct AVPacket *);
+ void *priv;
+ int64_t pos; ///< byte position in stream, -1 if unknown
+} AVPacket;
+#define PKT_FLAG_KEY 0x0001
+
+void av_destruct_packet_nofree(AVPacket *pkt);
+
+/**
+ * Default packet destructor.
+ */
+void av_destruct_packet(AVPacket *pkt);
+
+/**
+ * Initialize optional fields of a packet to default values.
+ *
+ * @param pkt packet
+ */
+void av_init_packet(AVPacket *pkt);
+
+/**
+ * Allocate the payload of a packet and initialize its fields to default values.
+ *
+ * @param pkt packet
+ * @param size wanted payload size
+ * @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.
+ *
+ * @param pkt packet
+ * @param size wanted 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
+ */
+int av_dup_packet(AVPacket *pkt);
+
+/**
+ * Free a packet
+ *
+ * @param pkt packet to free
+ */
+static inline void av_free_packet(AVPacket *pkt)
+{
+ if (pkt && pkt->destruct) {
+ pkt->destruct(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
+*/
+typedef struct AVFrac {
+ int64_t val, num, den;
+} AVFrac attribute_deprecated;
+
+/*************************************************/
+/* input/output formats */
+
+struct AVCodecTag;
+
+struct AVFormatContext;
+
+/** 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_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
+
+typedef struct AVFormatParameters {
+ AVRational time_base;
+ int sample_rate;
+ int channels;
+ 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
+ stream packet (only meaningful if
+ 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;
+ enum CodecID audio_codec_id;
+#endif
+} AVFormatParameters;
+
+//! 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 */
+
+typedef struct AVOutputFormat {
+ const char *name;
+ /**
+ * Descriptive name for the format, meant to be more human-readable
+ * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
+ * to define it.
+ */
+ 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 */
+ int priv_data_size;
+ /* output support */
+ enum CodecID audio_codec; /**< default audio codec */
+ enum CodecID video_codec; /**< default video codec */
+ int (*write_header)(struct AVFormatContext *);
+ int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
+ 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 */
+ int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
+ int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
+
+ /**
+ * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
+ * the arrays are all CODEC_ID_NONE terminated
+ */
+ const struct AVCodecTag * const *codec_tag;
+
+ enum CodecID subtitle_codec; /**< default subtitle codec */
+
+ /* private fields */
+ struct AVOutputFormat *next;
+} AVOutputFormat;
+
+typedef struct AVInputFormat {
+ const char *name;
+ /**
+ * Descriptive name for the format, meant to be more human-readable
+ * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
+ * to define it.
+ */
+ const char *long_name;
+ /** 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.
+ * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
+ * 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
+ 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
+ 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
+ freed by this function */
+ int (*read_close)(struct AVFormatContext *);
+ /**
+ * 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
+ * @return >= 0 on success (but not necessarily the new offset)
+ */
+ int (*read_seek)(struct AVFormatContext *,
+ int stream_index, int64_t timestamp, int flags);
+ /**
+ * 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 */
+ int flags;
+ /** 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 */
+ int value;
+
+ /** 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) */
+ int (*read_pause)(struct AVFormatContext *);
+
+ const struct AVCodecTag * const *codec_tag;
+
+ /* private fields */
+ struct AVInputFormat *next;
+} AVInputFormat;
+
+enum AVStreamParseType {
+ AVSTREAM_PARSE_NONE,
+ AVSTREAM_PARSE_FULL, /**< full parsing and repack */
+ AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */
+ AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
+};
+
+typedef struct AVIndexEntry {
+ int64_t pos;
+ 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 */
+} AVIndexEntry;
+
+#define AV_DISPOSITION_DEFAULT 0x0001
+#define AV_DISPOSITION_DUB 0x0002
+#define AV_DISPOSITION_ORIGINAL 0x0004
+#define AV_DISPOSITION_COMMENT 0x0008
+#define AV_DISPOSITION_LYRICS 0x0010
+#define AV_DISPOSITION_KARAOKE 0x0020
+
+/**
+ * Stream structure.
+ * 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(AVStream) must not be used outside libav*.
+ */
+typedef struct AVStream {
+ int index; /**< stream index in AVFormatContext */
+ 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.
+ */
+ 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 */
+ 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.
+ */
+ 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
+ //FIXME move stuff to a flags field?
+ /** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
+ * MN: dunno if that is the right place for it */
+ float quality;
+ /**
+ * Decoding: pts of the first frame of the stream, in stream time base.
+ * Only set this if you are absolutely 100% sure that the value you set
+ * it to really is the pts of the first frame.
+ * This may be undefined (AV_NOPTS_VALUE).
+ * @note The ASF header does NOT contain a correct start_time the ASF
+ * demuxer must NOT set this.
+ */
+ int64_t start_time;
+ /**
+ * 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.
+ */
+ int64_t duration;
+
+ char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
+
+ /* av_read_frame() support */
+ enum AVStreamParseType need_parsing;
+ struct AVCodecParserContext *parser;
+
+ int64_t cur_dts;
+ 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 */
+ int nb_index_entries;
+ unsigned int index_entries_allocated_size;
+
+ int64_t nb_frames; ///< number of frames in this stream if known or 0
+
+#if LIBAVFORMAT_VERSION_INT < (53<<16)
+ int64_t unused[4+1];
+#endif
+
+ char *filename; /**< source filename of the stream */
+
+ int disposition; /**< AV_DISPOSITION_* bitfield */
+
+ AVProbeData probe_data;
+#define MAX_REORDER_DELAY 16
+ int64_t pts_buffer[MAX_REORDER_DELAY+1];
+
+ /**
+ * sample aspect ratio (0 if unknown)
+ * - encoding: Set by user.
+ * - decoding: Set by libavformat.
+ */
+ AVRational sample_aspect_ratio;
+} AVStream;
+
+#define AV_PROGRAM_RUNNING 1
+
+/**
+ * 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(AVProgram) must not be used outside libav*.
+ */
+typedef struct AVProgram {
+ int id;
+ 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;
+ unsigned int nb_stream_indexes;
+} AVProgram;
+
+#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
+ (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
+ int64_t start, end; ///< chapter start/end time in time_base units
+ char *title; ///< chapter title
+} AVChapter;
+
+#define MAX_STREAMS 20
+
+/**
+ * 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 */
+ struct AVInputFormat *iformat;
+ struct AVOutputFormat *oformat;
+ void *priv_data;
+ ByteIOContext *pb;
+ unsigned int nb_streams;
+ AVStream *streams[MAX_STREAMS];
+ char filename[1024]; /**< input or output filename */
+ /* stream info */
+ int64_t timestamp;
+ char title[512];
+ char author[512];
+ char copyright[512];
+ char comment[512];
+ char album[512];
+ int year; /**< ID3 year, 0 if none */
+ 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) */
+ /** This buffer is only needed when packets were already buffered but
+ 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
+ AV_TIME_BASE fractional seconds. NEVER set this value directly:
+ it is deduced from the AVStream values. */
+ int64_t start_time;
+ /** 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 */
+ int64_t file_size;
+ /** 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;
+
+ /* av_read_frame() support */
+ AVStream *cur_st;
+ const uint8_t *cur_ptr;
+ int cur_len;
+ AVPacket cur_pkt;
+
+ /* av_seek_frame() support */
+ int64_t data_offset; /** offset of the first packet */
+ int index_built;
+
+ int mux_rate;
+ int packet_size;
+ int preload;
+ int max_delay;
+
+#define AVFMT_NOOUTPUTLOOP -1
+#define AVFMT_INFINITEOUTPUTLOOP 0
+ /** number of times to loop output in formats that support it */
+ 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
+
+ int loop_input;
+ /** 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()
+ */
+ int max_analyze_duration;
+
+ const uint8_t *key;
+ int keylen;
+
+ unsigned int nb_programs;
+ AVProgram **programs;
+
+ /**
+ * Forced video codec_id.
+ * demuxing: set by user
+ */
+ enum CodecID video_codec_id;
+ /**
+ * Forced audio codec_id.
+ * demuxing: set by user
+ */
+ enum CodecID audio_codec_id;
+ /**
+ * Forced subtitle codec_id.
+ * 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
+ * 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
+ * this.
+ * muxing : unused
+ * demuxing: set by user
+ */
+ unsigned int max_index_size;
+
+ /**
+ * Maximum amount of memory in bytes to use for buffering frames
+ * obtained from real-time capture devices.
+ */
+ unsigned int max_picture_buffer;
+
+ unsigned int nb_chapters;
+ AVChapter **chapters;
+
+ /**
+ * Flags to enable debuging.
+ */
+ int debug;
+#define FF_FDEBUG_TS 0x0001
+
+ /**
+ * 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.
+ */
+ struct AVPacketList *raw_packet_buffer;
+ struct AVPacketList *raw_packet_buffer_end;
+
+ struct AVPacketList *packet_buffer_end;
+} AVFormatContext;
+
+typedef struct AVPacketList {
+ AVPacket pkt;
+ struct AVPacketList *next;
+} AVPacketList;
+
+#if LIBAVFORMAT_VERSION_INT < (53<<16)
+extern AVInputFormat *first_iformat;
+extern AVOutputFormat *first_oformat;
+#endif
+
+AVInputFormat *av_iformat_next(AVInputFormat *f);
+AVOutputFormat *av_oformat_next(AVOutputFormat *f);
+
+enum CodecID av_guess_image2_codec(const char *filename);
+
+/* XXX: use automatic init with either ELF sections or C file parser */
+/* modules */
+
+/* utils.c */
+void av_register_input_format(AVInputFormat *format);
+void av_register_output_format(AVOutputFormat *format);
+AVOutputFormat *guess_stream_format(const char *short_name,
+ const char *filename, const char *mime_type);
+AVOutputFormat *guess_format(const char *short_name,
+ const char *filename, const char *mime_type);
+
+/**
+ * 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);
+
+/**
+ * Send a nice hexadecimal dump of a buffer to the specified file stream.
+ *
+ * @param f The file stream pointer where the dump should be sent to.
+ * @param buf buffer
+ * @param size buffer size
+ *
+ * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
+ */
+void av_hex_dump(FILE *f, uint8_t *buf, int size);
+
+/**
+ * Send a nice hexadecimal dump of a buffer to the log.
+ *
+ * @param avcl A pointer to an arbitrary struct of which the first field is a
+ * pointer to an AVClass struct.
+ * @param level The importance level of the message, lower values signifying
+ * higher importance.
+ * @param buf buffer
+ * @param size buffer size
+ *
+ * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
+ */
+void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
+
+/**
+ * Send a nice dump of a packet to the specified file stream.
+ *
+ * @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
+ */
+void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
+
+/**
+ * Send a nice dump of a packet to the log.
+ *
+ * @param avcl A pointer to an arbitrary struct of which the first field is a
+ * pointer to an AVClass struct.
+ * @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
+ */
+void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
+
+void av_register_all(void);
+
+/** codec tag <-> codec id */
+enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
+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.
+ */
+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
+ */
+AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
+
+/**
+ * Allocates all the structures needed to read an input stream.
+ * This does not open the needed codecs for decoding the stream[s].
+ */
+int av_open_input_stream(AVFormatContext **ic_ptr,
+ ByteIOContext *pb, const char *filename,
+ AVInputFormat *fmt, AVFormatParameters *ap);
+
+/**
+ * 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 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.
+ */
+int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
+ AVInputFormat *fmt,
+ int buf_size,
+ AVFormatParameters *ap);
+/**
+ * Allocate an AVFormatContext.
+ * Can be freed with av_free() but do not forget to free everything you
+ * explicitly allocated as well!
+ */
+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
+ * 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.
+ */
+int av_find_stream_info(AVFormatContext *ic);
+
+/**
+ * Read a transport packet from a media file.
+ *
+ * This function is obsolete and should never be used.
+ * Use av_read_frame() instead.
+ *
+ * @param s media file handle
+ * @param pkt is filled
+ * @return 0 if OK. AVERROR_xxx if error.
+ */
+int av_read_packet(AVFormatContext *s, AVPacket *pkt);
+
+/**
+ * Return the next frame of a stream.
+ *
+ * The returned packet is valid
+ * until the next av_read_frame() or until av_close_input_file() and
+ * must be freed with av_free_packet. For video, the packet contains
+ * exactly one frame. For audio, it contains an integer number of
+ * frames if each frame has a known fixed size (e.g. PCM or ADPCM
+ * data). If the audio frames have a variable size (e.g. MPEG audio),
+ * then it contains one frame.
+ *
+ * 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
+ * decompress the payload.
+ *
+ * @return 0 if OK, < 0 if error or end of file.
+ */
+int av_read_frame(AVFormatContext *s, AVPacket *pkt);
+
+/**
+ * Seek to the key frame at timestamp.
+ * 'timestamp' in 'stream_index'.
+ * @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 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
+ */
+int av_read_play(AVFormatContext *s);
+
+/**
+ * Pause a network based stream (e.g. RTSP stream).
+ *
+ * Use av_read_play() to resume it.
+ */
+int av_read_pause(AVFormatContext *s);
+
+/**
+ * Free a AVFormatContext allocated by av_open_input_stream.
+ * @param s context to free
+ */
+void av_close_input_stream(AVFormatContext *s);
+
+/**
+ * Close a media file (but not its codecs).
+ *
+ * @param s media file handle
+ */
+void av_close_input_file(AVFormatContext *s);
+
+/**
+ * Add a new stream to a media file.
+ *
+ * Can only be called in the read_header() function. If the flag
+ * AVFMTCTX_NOHEADER is in the format context, then new streams
+ * can be added in read_packet too.
+ *
+ * @param s media file handle
+ * @param id file format dependent stream id
+ */
+AVStream *av_new_stream(AVFormatContext *s, int id);
+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.
+ *
+ * @param s media file handle
+ * @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.
+ */
+AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title);
+
+/**
+ * Set the pts for a given stream.
+ *
+ * @param s stream
+ * @param pts_wrap_bits number of bits effectively used by the pts
+ * (used for wrap control, 33 is the value for MPEG)
+ * @param pts_num numerator to convert to seconds (MPEG: 1)
+ * @param pts_den denominator to convert to seconds (MPEG: 90000)
+ */
+void av_set_pts_info(AVStream *s, int pts_wrap_bits,
+ int pts_num, int pts_den);
+
+#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
+
+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 >=
+ * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
+ * @return < 0 if no such timestamp could be found
+ */
+int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
+
+/**
+ * Ensures the index uses less memory than the maximum specified in
+ * AVFormatContext.max_index_size, by discarding entries if it grows
+ * too large.
+ * This function is not part of the public API and should only be called
+ * by demuxers.
+ */
+void ff_reduce_index(AVFormatContext *s, int stream_index);
+
+/**
+ * Add a index entry into a sorted list updateing if it is already there.
+ *
+ * @param timestamp timestamp in the timebase of the given stream
+ */
+int av_add_index_entry(AVStream *st,
+ int64_t pos, int64_t timestamp, int size, int distance, int flags);
+
+/**
+ * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
+ * This is not supposed to be called directly by a user application, but by demuxers.
+ * @param target_ts target timestamp in the time base of the given stream
+ * @param stream_index stream number
+ */
+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.
+ *
+ * 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).
+ * @param timestamp new dts expressed in time_base of param ref_st
+ * @param ref_st reference stream giving time_base of param timestamp
+ */
+void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
+
+/**
+ * Does a binary search using read_timestamp().
+ * This is not supposed to be called directly by a user application, but by demuxers.
+ * @param target_ts target timestamp in the time base of the given stream
+ * @param stream_index stream number
+ */
+int64_t av_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
+
+/** media file output */
+int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
+
+/**
+ * Allocate the stream private data and write the stream header to an
+ * output media file.
+ *
+ * @param s media file handle
+ * @return 0 if OK. AVERROR_xxx if error.
+ */
+int av_write_header(AVFormatContext *s);
+
+/**
+ * Write a packet to an output media file.
+ *
+ * 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
+ *
+ * @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.
+ */
+int av_write_frame(AVFormatContext *s, AVPacket *pkt);
+
+/**
+ * Writes a packet to an output media file ensuring correct interleaving.
+ *
+ * The packet must contain one audio or video frame.
+ * If the packets are already correctly interleaved the application should
+ * call av_write_frame() instead as it is slightly faster. It is also important
+ * to keep in mind that completely non-interleaved input will need huge amounts
+ * of memory to interleave with this, so it is preferable to interleave at the
+ * demuxer level.
+ *
+ * @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.
+ */
+int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
+
+/**
+ * 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.
+ *
+ * @param s media file handle
+ * @param out the interleaved packet will be output here
+ * @param in the input packet
+ * @param flush 1 if no further packets are available as input and all
+ * remaining packets should be output
+ * @return 1 if a packet was output, 0 if no packet could be output,
+ * < 0 if an error occurred
+ */
+int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
+
+/**
+ * @brief Write the stream trailer to an output media file and
+ * free the file private data.
+ *
+ * @param s media file handle
+ * @return 0 if OK. AVERROR_xxx if error.
+ */
+int av_write_trailer(AVFormatContext *s);
+
+void dump_format(AVFormatContext *ic,
+ int index,
+ const char *url,
+ int is_output);
+
+/**
+ * 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);
+
+/**
+ * Converts frame rate from string to a fraction.
+ * @deprecated Use av_parse_video_frame_rate instead.
+ */
+attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
+
+/**
+ * Parses \p datestr and returns a corresponding number of microseconds.
+ * @param datestr String representing a date or a duration.
+ * - If a date the syntax is:
+ * @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
+ * interpreted as UTC.
+ * If the year-month-day part isn't 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
+ * successfully parsed.
+ * - If a duration the syntax is:
+ * @code
+ * [-]HH[:MM[:SS[.m...]]]
+ * [-]S+[.m...]
+ * @endcode
+ * Returns the number of microseconds contained in a time interval
+ * with the specified duration or INT64_MIN if \p datestr cannot be
+ * successfully parsed.
+ * @param duration Flag which tells how to interpret \p datestr, if
+ * not zero \p datestr is interpreted as a duration, otherwise as a
+ * date.
+ */
+int64_t parse_date(const char *datestr, int duration);
+
+int64_t av_gettime(void);
+
+/* 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);
+void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
+
+/**
+ * Attempts to find a specific tag in a URL.
+ *
+ * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
+ * Return 1 if found.
+ */
+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 '%%'.
+ *
+ * @param buf destination buffer
+ * @param buf_size destination buffer size
+ * @param path numbered sequence string
+ * @param number frame number
+ * @return 0 if OK, -1 if format error.
+ */
+int av_get_frame_filename(char *buf, int buf_size,
+ const char *path, int number);
+
+/**
+ * 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.
+ */
+int av_filename_number_test(const char *filename);
+
+/**
+ * Generate an SDP for an RTP session.
+ *
+ * @param ac array of AVFormatContexts describing the RTP streams. If the
+ * 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
+ * @param n_files number of AVCodecContexts contained in ac
+ * @param buff buffer where the SDP will be stored (must be allocated by
+ * the caller
+ * @param size the size of the buffer
+ * @return 0 if OK. AVERROR_xxx if error.
+ */
+int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
+
+#ifdef HAVE_AV_CONFIG_H
+
+void ff_dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
+
+#ifdef __GNUC__
+#define dynarray_add(tab, nb_ptr, elem)\
+do {\
+ typeof(tab) _tab = (tab);\
+ typeof(elem) _elem = (elem);\
+ (void)sizeof(**_tab == _elem); /* check that types are compatible */\
+ ff_dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
+} while(0)
+#else
+#define dynarray_add(tab, nb_ptr, elem)\
+do {\
+ ff_dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
+} while(0)
+#endif
+
+time_t mktimegm(struct tm *tm);
+struct tm *brktimegm(time_t secs, struct tm *tm);
+const char *small_strptime(const char *p, const char *fmt,
+ struct tm *dt);
+
+struct in_addr;
+int resolve_host(struct in_addr *sin_addr, const char *hostname);
+
+void url_split(char *proto, int proto_size,
+ char *authorization, int authorization_size,
+ char *hostname, int hostname_size,
+ int *port_ptr,
+ char *path, int path_size,
+ const char *url);
+
+int match_ext(const char *filename, const char *extensions);
+
+#endif /* HAVE_AV_CONFIG_H */
+
+#endif /* FFMPEG_AVFORMAT_H */
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