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FFmpeg
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#include <avformat.h>
Public Attributes | |
| int | index |
| stream index in AVFormatContext | |
| int | id |
| Format-specific stream ID. More... | |
| void * | priv_data |
| AVRational | time_base |
| This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented. More... | |
| int64_t | start_time |
| Decoding: pts of the first frame of the stream in presentation order, in stream time base. More... | |
| int64_t | duration |
| Decoding: duration of the stream, in stream time base. More... | |
| int64_t | nb_frames |
| number of frames in this stream if known or 0 | |
| int | disposition |
| AV_DISPOSITION_* bit field. | |
| enum AVDiscard | discard |
| Selects which packets can be discarded at will and do not need to be demuxed. | |
| AVRational | sample_aspect_ratio |
| sample aspect ratio (0 if unknown) More... | |
| AVDictionary * | metadata |
| AVRational | avg_frame_rate |
| Average framerate. More... | |
| AVPacket | attached_pic |
| For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet will contain the attached picture. More... | |
| AVPacketSideData * | side_data |
| An array of side data that applies to the whole stream (i.e. More... | |
| int | nb_side_data |
| The number of elements in the AVStream.side_data array. | |
| int | event_flags |
| Flags for the user to detect events happening on the stream. More... | |
| AVRational | r_frame_rate |
| Real base framerate of the stream. More... | |
| AVCodecParameters * | codecpar |
| Codec parameters associated with this stream. More... | |
| struct { | |
| int64_t last_dts | |
| int64_t duration_gcd | |
| int duration_count | |
| int64_t rfps_duration_sum | |
| double(* duration_error )[2][MAX_STD_TIMEBASES] | |
| int64_t codec_info_duration | |
| int64_t codec_info_duration_fields | |
| int frame_delay_evidence | |
| int found_decoder | |
| 0 -> decoder has not been searched for yet. More... | |
| int64_t last_duration | |
| int64_t fps_first_dts | |
| Those are used for average framerate estimation. | |
| int fps_first_dts_idx | |
| int64_t fps_last_dts | |
| int fps_last_dts_idx | |
| } * | info |
| Stream information used internally by avformat_find_stream_info() | |
| int | pts_wrap_bits |
| number of bits in pts (used for wrapping control) | |
| int64_t | first_dts |
| Timestamp corresponding to the last dts sync point. More... | |
| int64_t | cur_dts |
| int64_t | last_IP_pts |
| int | last_IP_duration |
| int | probe_packets |
| Number of packets to buffer for codec probing. | |
| int | codec_info_nb_frames |
| Number of frames that have been demuxed during avformat_find_stream_info() | |
| enum AVStreamParseType | need_parsing |
| struct AVCodecParserContext * | parser |
| struct AVPacketList * | last_in_packet_buffer |
| last packet in packet_buffer for this stream when muxing. | |
| AVProbeData | probe_data |
| int64_t | pts_buffer [MAX_REORDER_DELAY+1] |
| AVIndexEntry * | index_entries |
| Only used if the format does not support seeking natively. More... | |
| int | nb_index_entries |
| unsigned int | index_entries_allocated_size |
| int | stream_identifier |
| Stream Identifier This is the MPEG-TS stream identifier +1 0 means unknown. | |
| int64_t | interleaver_chunk_size |
| int64_t | interleaver_chunk_duration |
| int | request_probe |
| stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with request_probe being the minimum score to accept. More... | |
| int | skip_to_keyframe |
| Indicates that everything up to the next keyframe should be discarded. | |
| int | skip_samples |
| Number of samples to skip at the start of the frame decoded from the next packet. | |
| int64_t | start_skip_samples |
| If not 0, the number of samples that should be skipped from the start of the stream (the samples are removed from packets with pts==0, which also assumes negative timestamps do not happen). More... | |
| int64_t | first_discard_sample |
| If not 0, the first audio sample that should be discarded from the stream. More... | |
| int64_t | last_discard_sample |
| The sample after last sample that is intended to be discarded after first_discard_sample. More... | |
| int | nb_decoded_frames |
| Number of internally decoded frames, used internally in libavformat, do not access its lifetime differs from info which is why it is not in that structure. | |
| int64_t | mux_ts_offset |
| Timestamp offset added to timestamps before muxing NOT PART OF PUBLIC API. | |
| int64_t | pts_wrap_reference |
| Internal data to check for wrapping of the time stamp. | |
| int | pts_wrap_behavior |
| Options for behavior, when a wrap is detected. More... | |
| int | update_initial_durations_done |
| Internal data to prevent doing update_initial_durations() twice. | |
| int64_t | pts_reorder_error [MAX_REORDER_DELAY+1] |
| Internal data to generate dts from pts. | |
| uint8_t | pts_reorder_error_count [MAX_REORDER_DELAY+1] |
| int64_t | last_dts_for_order_check |
| Internal data to analyze DTS and detect faulty mpeg streams. | |
| uint8_t | dts_ordered |
| uint8_t | dts_misordered |
| int | inject_global_side_data |
| Internal data to inject global side data. | |
| AVRational | display_aspect_ratio |
| display aspect ratio (0 if unknown) More... | |
| AVStreamInternal * | internal |
| An opaque field for libavformat internal usage. More... | |
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*.
| AVPacket AVStream::attached_pic |
For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet will contain the attached picture.
decoding: set by libavformat, must not be modified by the caller. encoding: unused
| AVRational AVStream::avg_frame_rate |
Average framerate.
| AVCodecParameters* AVStream::codecpar |
Codec parameters associated with this stream.
Allocated and freed by libavformat in avformat_new_stream() and avformat_free_context() respectively.
| AVRational AVStream::display_aspect_ratio |
display aspect ratio (0 if unknown)
| int64_t AVStream::duration |
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 estimated from bitrate and file size.
Encoding: May be set by the caller before avformat_write_header() to provide a hint to the muxer about the estimated duration.
| int AVStream::event_flags |
Flags for the user to detect events happening on the stream.
Flags must be cleared by the user once the event has been handled. A combination of AVSTREAM_EVENT_FLAG_*.
| int64_t AVStream::first_discard_sample |
If not 0, the first audio sample that should be discarded from the stream.
This is broken by design (needs global sample count), but can't be avoided for broken by design formats such as mp3 with ad-hoc gapless audio support.
| int64_t AVStream::first_dts |
Timestamp corresponding to the last dts sync point.
Initialized when AVCodecParserContext.dts_sync_point >= 0 and a DTS is received from the underlying container. Otherwise set to AV_NOPTS_VALUE by default.
| int AVStream::found_decoder |
0 -> decoder has not been searched for yet.
>0 -> decoder found <0 -> decoder with codec_id == -found_decoder has not been found
| int AVStream::id |
Format-specific stream ID.
decoding: set by libavformat encoding: set by the user, replaced by libavformat if left unset
| AVIndexEntry* AVStream::index_entries |
Only used if the format does not support seeking natively.
| AVStreamInternal* AVStream::internal |
An opaque field for libavformat internal usage.
Must not be accessed in any way by callers.
| int64_t AVStream::last_discard_sample |
The sample after last sample that is intended to be discarded after first_discard_sample.
Works on frame boundaries only. Used to prevent early EOF if the gapless info is broken (considered concatenated mp3s).
| int AVStream::pts_wrap_behavior |
Options for behavior, when a wrap is detected.
Defined by AV_PTS_WRAP_ values.
If correction is enabled, there are two possibilities: If the first time stamp is near the wrap point, the wrap offset will be subtracted, which will create negative time stamps. Otherwise the offset will be added.
| AVRational AVStream::r_frame_rate |
Real base framerate of the stream.
This is the lowest framerate with which all timestamps can be represented accurately (it is the least common multiple of all framerates 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.
| int AVStream::request_probe |
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with request_probe being the minimum score to accept.
NOT PART OF PUBLIC API
| AVRational AVStream::sample_aspect_ratio |
sample aspect ratio (0 if unknown)
| AVPacketSideData* AVStream::side_data |
An array of side data that applies to the whole stream (i.e.
the container does not allow it to change between packets).
There may be no overlap between the side data in this array and side data in the packets. I.e. a given side data is either exported by the muxer (demuxing) / set by the caller (muxing) in this array, then it never appears in the packets, or the side data is exported / sent through the packets (always in the first packet where the value becomes known or changes), then it does not appear in this array.
Freed by libavformat in avformat_free_context().
| int64_t AVStream::start_skip_samples |
If not 0, the number of samples that should be skipped from the start of the stream (the samples are removed from packets with pts==0, which also assumes negative timestamps do not happen).
Intended for use with formats such as mp3 with ad-hoc gapless audio support.
| int64_t AVStream::start_time |
Decoding: pts of the first frame of the stream in presentation order, 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).
| AVRational AVStream::time_base |
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
decoding: set by libavformat encoding: May be set by the caller before avformat_write_header() to provide a hint to the muxer about the desired timebase. In avformat_write_header(), the muxer will overwrite this field with the timebase that will actually be used for the timestamps written into the file (which may or may not be related to the user-provided one, depending on the format).
1.8.12