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FFmpeg
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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"
Include dependency graph for astenc.c:
Go to the source code of this file.
Data Structures | |
| struct | ASTMuxContext |
Macros | |
| #define | CHECK_LOOP(type) |
| #define | OFFSET(obj) offsetof(ASTMuxContext, obj) |
Typedefs | |
| typedef struct ASTMuxContext | ASTMuxContext |
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
| #define CHECK_LOOP | ( | type | ) |
Value:
if (ast->loop ## type > 0) { \
} \
}
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:60
initialize output if(nPeaks >3)%at least 3 peaks in spectrum for trying to find f0 nf0peaks
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFilterBuffer 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.Buffer references ownership and permissions
#define type
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame This method is called when a frame is wanted on an output For an it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return it should return
Definition: filter_design.txt:216
Definition at line 38 of file astenc.c.
Referenced by ast_write_header().
| #define OFFSET | ( | obj | ) | offsetof(ASTMuxContext, obj) |
Typedef Documentation
| typedef struct ASTMuxContext ASTMuxContext |
Function Documentation
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static |
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static |
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Variable Documentation
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static |
Initial value:
= {
.class_name = "AST muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
}
| 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,
.priv_class = &ast_muxer_class,
}
static int ast_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: astenc.c:109
Definition: libavcodec/avcodec.h:100
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: libavformat/assenc.c:63
Definition: libavformat/internal.h:35
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: libavutil/internal.h:123
struct ASTMuxContext ASTMuxContext
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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: opt.h:223
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:281
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