FFmpeg
Data Structures | Macros | Functions | Variables
astenc.c File Reference
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "ast.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"

Go to the source code of this file.

Data Structures

struct  ASTMuxContext
 

Macros

#define CHECK_LOOP(type)
 
#define OFFSET(obj)   offsetof(ASTMuxContext, obj)
 

Functions

static int ast_write_header (AVFormatContext *s)
 
static int ast_write_packet (AVFormatContext *s, AVPacket *pkt)
 
static int ast_write_trailer (AVFormatContext *s)
 

Variables

static const AVOption options []
 
static const AVClass ast_muxer_class
 
AVOutputFormat ff_ast_muxer
 

Macro Definition Documentation

◆ CHECK_LOOP

#define CHECK_LOOP (   type)
Value:
if (ast->loop ## type > 0) { \
ast->loop ## type = av_rescale_rnd(ast->loop ## type, par->sample_rate, 1000, AV_ROUND_DOWN); \
if (ast->loop ## type < 0 || ast->loop ## type > UINT_MAX) { \
av_log(s, AV_LOG_ERROR, "Invalid loop" #type " value\n"); \
return AVERROR(EINVAL); \
} \
}

Definition at line 38 of file astenc.c.

◆ OFFSET

#define OFFSET (   obj)    offsetof(ASTMuxContext, obj)

Definition at line 188 of file astenc.c.

Function Documentation

◆ ast_write_header()

static int ast_write_header ( AVFormatContext *  s)
static

Definition at line 47 of file astenc.c.

◆ ast_write_packet()

static int ast_write_packet ( AVFormatContext *  s,
AVPacket *  pkt 
)
static

Definition at line 109 of file astenc.c.

◆ ast_write_trailer()

static int ast_write_trailer ( AVFormatContext *  s)
static

Definition at line 132 of file astenc.c.

Variable Documentation

◆ options

const AVOption options[]
static
Initial value:
= {
{ "loopstart", "Loopstart position in milliseconds.", OFFSET(loopstart), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ "loopend", "Loopend position in milliseconds.", OFFSET(loopend), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL },
}

Definition at line 189 of file astenc.c.

◆ ast_muxer_class

const AVClass ast_muxer_class
static
Initial value:
= {
.class_name = "AST muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
}

Definition at line 195 of file astenc.c.

◆ ff_ast_muxer

AVOutputFormat ff_ast_muxer
Initial value:
= {
.name = "ast",
.long_name = NULL_IF_CONFIG_SMALL("AST (Audio Stream)"),
.extensions = "ast",
.priv_data_size = sizeof(ASTMuxContext),
.audio_codec = AV_CODEC_ID_PCM_S16BE_PLANAR,
.video_codec = AV_CODEC_ID_NONE,
.write_header = ast_write_header,
.write_packet = ast_write_packet,
.write_trailer = ast_write_trailer,
.priv_class = &ast_muxer_class,
.codec_tag = (const AVCodecTag* const []){ff_codec_ast_tags, 0},
}

Definition at line 202 of file astenc.c.

OFFSET
#define OFFSET(obj)
Definition: astenc.c:188
AVERROR
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
ast_write_trailer
static int ast_write_trailer(AVFormatContext *s)
Definition: astenc.c:132
AV_CODEC_ID_PCM_S16BE_PLANAR
@ AV_CODEC_ID_PCM_S16BE_PLANAR
Definition: avcodec.h:493
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
loop
static int loop
Definition: ffplay.c:340
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVCodecTag
Definition: internal.h:44
ast_muxer_class
static const AVClass ast_muxer_class
Definition: astenc.c:195
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_OPT_FLAG_ENCODING_PARAM
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:276
ff_codec_ast_tags
const AVCodecTag ff_codec_ast_tags[]
Definition: ast.c:25
AV_OPT_TYPE_INT64
@ AV_OPT_TYPE_INT64
Definition: opt.h:224
options
static const AVOption options[]
Definition: astenc.c:189
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
NULL
#define NULL
Definition: coverity.c:32
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
av_rescale_rnd
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
Rescale a 64-bit integer with specified rounding.
Definition: mathematics.c:58
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:188
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:690
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: avcodec.h:216
AV_ROUND_DOWN
@ AV_ROUND_DOWN
Round toward -infinity.
Definition: mathematics.h:82
ast_write_header
static int ast_write_header(AVFormatContext *s)
Definition: astenc.c:47
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:337
ast_write_packet
static int ast_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: astenc.c:109
ASTMuxContext
Definition: astenc.c:29
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