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38 #define MAX_FILENAME_SIZE 1024
62 if (
s->nb_streams != 1)
213 return (
ret < 0) ?
ret : 0;
280 #define OFFSET(x) offsetof(WebMChunkContext, x)
297 .
p.
name =
"webm_chunk",
299 .p.mime_type =
"video/webm",
300 .p.extensions =
"chk",
static const AVClass webm_chunk_class
static int chunk_start(AVFormatContext *s)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
enum AVMediaType codec_type
General type of the encoded data.
static int webm_chunk_write_header(AVFormatContext *s)
AVStream ** streams
A list of all streams in the file.
static void deinit(AVFormatContext *s)
int strict_std_compliance
Allow non-standard and experimental extension.
const FFOutputFormat ff_webm_chunk_muxer
av_warn_unused_result int avformat_init_output(AVFormatContext *s, AVDictionary **options)
Allocate the stream private data and initialize the codec, but do not write the header.
int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
static int get_chunk_filename(AVFormatContext *s, char filename[MAX_FILENAME_SIZE])
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
static int webm_chunk_write_trailer(AVFormatContext *s)
int flush_packets
Flush the I/O context after each packet.
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
Return the written size and a pointer to the buffer.
static int chunk_end(AVFormatContext *s, int flush)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
AVDictionary * metadata
Metadata that applies to the whole file.
int avio_open_dyn_buf(AVIOContext **s)
Open a write only memory stream.
int flags
Flags modifying the (de)muxer behaviour.
#define AVIO_FLAG_WRITE
write-only
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
static int webm_chunk_write_packet(AVFormatContext *s, AVPacket *pkt)
av_warn_unused_result int avformat_write_header(AVFormatContext *s, AVDictionary **options)
Allocate the stream private data and write the stream header to an output media file.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
#define LIBAVUTIL_VERSION_INT
Describe the class of an AVClass context structure.
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
static int write_trailer(AVFormatContext *s1)
Rational number (pair of numerator and denominator).
const char * av_default_item_name(void *ptr)
Return the context name.
AVIOContext * pb
I/O context.
void(* flush)(AVBSFContext *ctx)
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
Write a packet to an output media file.
#define AV_OPT_FLAG_ENCODING_PARAM
A generic parameter which can be set by the user for muxing or encoding.
static int webm_chunk_init(AVFormatContext *s)
enum FFFormatContext::@384 avoid_negative_ts_status
Whether the timestamp shift offset has already been determined.
static const AVOption options[]
int(* init)(AVBSFContext *ctx)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
char * url
input or output URL.
#define AV_NOPTS_VALUE
Undefined timestamp value.
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
int flags
A combination of AV_PKT_FLAG values.
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values.
int av_write_trailer(AVFormatContext *s)
Write the stream trailer to an output media file and free the file private data.
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
#define AVERROR_MUXER_NOT_FOUND
Muxer not found.
int avoid_negative_ts
Avoid negative timestamps during muxing.
static int write_packet(Muxer *mux, OutputStream *ost, AVPacket *pkt)
void ffio_free_dyn_buf(AVIOContext **s)
Free a dynamic buffer.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer
@ AV_OPT_TYPE_INT
Underlying C type is int.
void avformat_free_context(AVFormatContext *s)
Free an AVFormatContext and all its streams.
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags)
Convenience wrapper for av_dict_set() that converts the value to a string and stores it.
static void webm_chunk_deinit(AVFormatContext *s)
const AVOutputFormat * av_guess_format(const char *short_name, const char *filename, const char *mime_type)
Return the output format in the list of registered output formats which best matches the provided par...
#define MAX_FILENAME_SIZE
This structure stores compressed data.
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
int av_dict_copy(AVDictionary **dst, const AVDictionary *src, int flags)
Copy entries from one AVDictionary struct into another.
@ AV_OPT_TYPE_STRING
Underlying C type is a uint8_t* that is either NULL or points to a C string allocated with the av_mal...
static void write_header(FFV1Context *f)
int pts_wrap_bits
Number of bits in timestamps.
int64_t lowest_ts_allowed
This is the lowest ts allowed in this track; it may be set by the muxer during init or write_header a...
uint64_t duration_written
int avoid_negative_ts_use_pts