FFmpeg/libavformat/mux.h
Andreas Rheinhardt a24bccc238 avformat/mux: Add flag for "only default codecs allowed"
AVOutputFormat has default codecs for audio, video and subtitle
and often these are the only codecs of this type allowed.
So add a flag to AVOutputFormat so that this can be checked generically.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-22 23:57:19 +01:00

281 lines
10 KiB
C

/*
* 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 AVFORMAT_MUX_H
#define AVFORMAT_MUX_H
#include <stdint.h>
#include "libavcodec/packet.h"
#include "avformat.h"
struct AVDeviceInfoList;
/**
* This flag indicates that the muxer stores data internally
* and supports flushing it. Flushing is signalled by sending
* a NULL packet to the muxer's write_packet callback;
* without this flag, a muxer never receives NULL packets.
* So the documentation of write_packet below for the semantics
* of the return value in case of flushing.
*/
#define FF_OFMT_FLAG_ALLOW_FLUSH (1 << 1)
/**
* If this flag is set, it indicates that for each codec type
* whose corresponding default codec (i.e. AVOutputFormat.audio_codec,
* AVOutputFormat.video_codec and AVOutputFormat.subtitle_codec)
* is set (i.e. != AV_CODEC_ID_NONE) only one stream of this type
* can be muxed. It furthermore indicates that no stream with
* a codec type that has no default codec or whose default codec
* is AV_CODEC_ID_NONE can be muxed.
* Both of these restrictions are checked generically before
* the actual muxer's init/write_header callbacks.
*/
#define FF_OFMT_FLAG_MAX_ONE_OF_EACH (1 << 2)
/**
* If this flag is set, then the only permitted audio/video/subtitle
* codec ids are AVOutputFormat.audio/video/subtitle_codec;
* if any of the latter is unset (i.e. equal to AV_CODEC_ID_NONE),
* then no stream of the corresponding type is supported.
* In addition, codec types without default codec field
* are disallowed.
*/
#define FF_OFMT_FLAG_ONLY_DEFAULT_CODECS (1 << 3)
typedef struct FFOutputFormat {
/**
* The public AVOutputFormat. See avformat.h for it.
*/
AVOutputFormat p;
/**
* size of private data so that it can be allocated in the wrapper
*/
int priv_data_size;
/**
* Internal flags. See FF_OFMT_FLAG_* above and FF_FMT_FLAG_* in internal.h.
*/
int flags_internal;
int (*write_header)(AVFormatContext *);
/**
* Write a packet. If FF_OFMT_FLAG_ALLOW_FLUSH is set in flags_internal,
* pkt can be NULL in order to flush data buffered in the muxer.
* When flushing, return 0 if there still is more data to flush,
* or 1 if everything was flushed and there is no more buffered
* data.
*/
int (*write_packet)(AVFormatContext *, AVPacket *pkt);
int (*write_trailer)(AVFormatContext *);
/**
* A format-specific function for interleavement.
* If unset, packets will be interleaved by dts.
*
* @param s An AVFormatContext for output. pkt will be added to
* resp. taken from its packet buffer.
* @param[in,out] pkt A packet to be interleaved if has_packet is set;
* also used to return packets. If no packet is returned
* (e.g. on error), pkt is blank on return.
* @param flush 1 if no further packets are available as input and
* all remaining packets should be output.
* @param has_packet If set, pkt contains a packet to be interleaved
* on input; otherwise pkt is blank on input.
* @return 1 if a packet was output, 0 if no packet could be output,
* < 0 if an error occurred
*/
int (*interleave_packet)(AVFormatContext *s, AVPacket *pkt,
int flush, int has_packet);
/**
* Test if the given codec can be stored in this container.
*
* @return 1 if the codec is supported, 0 if it is not.
* A negative number if unknown.
* MKTAG('A', 'P', 'I', 'C') if the codec is only supported as AV_DISPOSITION_ATTACHED_PIC
*/
int (*query_codec)(enum AVCodecID id, int std_compliance);
void (*get_output_timestamp)(AVFormatContext *s, int stream,
int64_t *dts, int64_t *wall);
/**
* Allows sending messages from application to device.
*/
int (*control_message)(AVFormatContext *s, int type,
void *data, size_t data_size);
/**
* Write an uncoded AVFrame.
*
* See av_write_uncoded_frame() for details.
*
* The library will free *frame afterwards, but the muxer can prevent it
* by setting the pointer to NULL.
*/
int (*write_uncoded_frame)(AVFormatContext *, int stream_index,
struct AVFrame **frame, unsigned flags);
/**
* Returns device list with it properties.
* @see avdevice_list_devices() for more details.
*/
int (*get_device_list)(AVFormatContext *s, struct AVDeviceInfoList *device_list);
/**
* Initialize format. May allocate data here, and set any AVFormatContext or
* AVStream parameters that need to be set before packets are sent.
* This method must not write output.
*
* Return 0 if streams were fully configured, 1 if not, negative AVERROR on failure
*
* Any allocations made here must be freed in deinit().
*/
int (*init)(AVFormatContext *);
/**
* Deinitialize format. If present, this is called whenever the muxer is being
* destroyed, regardless of whether or not the header has been written.
*
* If a trailer is being written, this is called after write_trailer().
*
* This is called if init() fails as well.
*/
void (*deinit)(AVFormatContext *);
/**
* Set up any necessary bitstream filtering and extract any extra data needed
* for the global header.
*
* @note pkt might have been directly forwarded by a meta-muxer; therefore
* pkt->stream_index as well as the pkt's timebase might be invalid.
* Return 0 if more packets from this stream must be checked; 1 if not.
*/
int (*check_bitstream)(AVFormatContext *s, AVStream *st,
const AVPacket *pkt);
} FFOutputFormat;
static inline const FFOutputFormat *ffofmt(const AVOutputFormat *fmt)
{
return (const FFOutputFormat*)fmt;
}
/**
* Add packet to an AVFormatContext's packet_buffer list, determining its
* interleaved position using compare() function argument.
* @return 0 on success, < 0 on error. pkt will always be blank on return.
*/
int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
int (*compare)(AVFormatContext *, const AVPacket *, const AVPacket *));
/**
* Interleave an AVPacket per dts so it can be muxed.
* See the documentation of AVOutputFormat.interleave_packet for details.
*/
int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *pkt,
int flush, int has_packet);
/**
* Interleave packets directly in the order in which they arrive
* without any sort of buffering.
*/
int ff_interleave_packet_passthrough(AVFormatContext *s, AVPacket *pkt,
int flush, int has_packet);
/**
* Find the next packet in the interleaving queue for the given stream.
*
* @return a pointer to a packet if one was found, NULL otherwise.
*/
const AVPacket *ff_interleaved_peek(AVFormatContext *s, int stream);
int ff_get_muxer_ts_offset(AVFormatContext *s, int stream_index, int64_t *offset);
/**
* Add a bitstream filter to a stream.
*
* @param st output stream to add a filter to
* @param name the name of the filter to add
* @param args filter-specific argument string
* @return >0 on success;
* AVERROR code on failure
*/
int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);
/**
* Write a packet to another muxer than the one the user originally
* intended. Useful when chaining muxers, where one muxer internally
* writes a received packet to another muxer.
*
* @param dst the muxer to write the packet to
* @param dst_stream the stream index within dst to write the packet to
* @param pkt the packet to be written. It will be returned blank when
* av_interleaved_write_frame() is used, unchanged otherwise.
* @param src the muxer the packet originally was intended for
* @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame
* @return the value av_write_frame returned
*/
int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
AVFormatContext *src, int interleave);
/**
* Flags for AVFormatContext.write_uncoded_frame()
*/
enum AVWriteUncodedFrameFlags {
/**
* Query whether the feature is possible on this stream.
* The frame argument is ignored.
*/
AV_WRITE_UNCODED_FRAME_QUERY = 0x0001,
};
/**
* Make shift_size amount of space at read_start by shifting data in the output
* at read_start until the current IO position. The underlying IO context must
* be seekable.
*/
int ff_format_shift_data(AVFormatContext *s, int64_t read_start, int shift_size);
/**
* Utility function to open IO stream of output format.
*
* @param s AVFormatContext
* @param url URL or file name to open for writing
* @options optional options which will be passed to io_open callback
* @return >=0 on success, negative AVERROR in case of failure
*/
int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
/**
* Parse creation_time in AVFormatContext metadata if exists and warn if the
* parsing fails.
*
* @param s AVFormatContext
* @param timestamp parsed timestamp in microseconds, only set on successful parsing
* @param return_seconds set this to get the number of seconds in timestamp instead of microseconds
* @return 1 if OK, 0 if the metadata was not present, AVERROR(EINVAL) on parse error
*/
int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
/**
* Standardize creation_time metadata in AVFormatContext to an ISO-8601
* timestamp string.
*
* @param s AVFormatContext
* @return <0 on error
*/
int ff_standardize_creation_time(AVFormatContext *s);
#endif /* AVFORMAT_MUX_H */