FFmpeg
Data Structures | Macros | Functions | Variables
caca.c File Reference
#include <caca.h>
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avdevice.h"

Go to the source code of this file.

Data Structures

struct  CACAContext
 

Macros

#define DEFINE_LIST_DITHER(thing, thing_str)
 
#define CHECK_DITHER_OPT(opt)
 
#define OFFSET(x)   offsetof(CACAContext,x)
 
#define ENC   AV_OPT_FLAG_ENCODING_PARAM
 

Functions

static int caca_write_trailer (AVFormatContext *s)
 
static void list_drivers (CACAContext *c)
 
 DEFINE_LIST_DITHER (color,"colors")
 
 DEFINE_LIST_DITHER (charset,"charsets")
 
 DEFINE_LIST_DITHER (algorithm,"algorithms")
 
 DEFINE_LIST_DITHER (antialias,"antialias")
 
static int caca_write_header (AVFormatContext *s)
 
static int caca_write_packet (AVFormatContext *s, AVPacket *pkt)
 

Variables

static const AVOption options []
 
static const AVClass caca_class
 
AVOutputFormat ff_caca_muxer
 

Macro Definition Documentation

#define DEFINE_LIST_DITHER (   thing,
  thing_str 
)
Value:
static void list_dither_## thing(CACAContext *c) \
{ \
const char *const *thing = caca_get_dither_## thing ##_list(c->dither); \
av_log(c->ctx, AV_LOG_INFO, "Available %s:\n", thing_str); \
for (i = 0; thing[i]; i += 2) \
av_log(c->ctx, AV_LOG_INFO, "%s: %s\n", thing[i], thing[i + 1]); \
}
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
#define av_log(a,...)
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
int
for(j=16;j >0;--j)
int i
Definition: input.c:406

Definition at line 75 of file caca.c.

#define CHECK_DITHER_OPT (   opt)
Value:
do { \
if (caca_set_dither_##opt(c->dither, c->opt) < 0) { \
ret = AVERROR(errno); \
av_log(s, AV_LOG_ERROR, "Failed to set value '%s' for option '%s'\n", \
c->opt, #opt); \
goto fail; \
} \
} while (0)
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
#define fail()
Definition: checkasm.h:123
#define s(width, name)
Definition: cbs_vp9.c:257
if(ret)
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

Referenced by caca_write_header().

#define OFFSET (   x)    offsetof(CACAContext,x)

Definition at line 202 of file caca.c.

#define ENC   AV_OPT_FLAG_ENCODING_PARAM

Definition at line 203 of file caca.c.

Function Documentation

static int caca_write_trailer ( AVFormatContext s)
static

Definition at line 44 of file caca.c.

Referenced by caca_write_header().

static void list_drivers ( CACAContext c)
static

Definition at line 65 of file caca.c.

DEFINE_LIST_DITHER ( color  ,
"colors"   
)
DEFINE_LIST_DITHER ( charset  ,
"charsets"   
)
DEFINE_LIST_DITHER ( algorithm  ,
"algorithms"   
)
DEFINE_LIST_DITHER ( antialias  ,
"antialias"   
)
static int caca_write_header ( AVFormatContext s)
static

Definition at line 91 of file caca.c.

static int caca_write_packet ( AVFormatContext s,
AVPacket pkt 
)
static

Definition at line 192 of file caca.c.

Variable Documentation

const AVOption options[]
static
Initial value:
= {
{ "window_size", "set window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL }, 0, 0, ENC},
{ "window_title", "set window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, ENC },
{ "driver", "set display driver", OFFSET(driver), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, ENC },
{ "algorithm", "set dithering algorithm", OFFSET(algorithm), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC },
{ "antialias", "set antialias method", OFFSET(antialias), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC },
{ "charset", "set charset used to render output", OFFSET(charset), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC },
{ "color", "set color used to render output", OFFSET(color), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC },
{ "list_drivers", "list available drivers", OFFSET(list_drivers), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, ENC },
{ "list_dither", "list available dither options", OFFSET(list_dither), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 1, ENC, "list_dither" },
{ "algorithms", NULL, 0, AV_OPT_TYPE_CONST, {.str = "algorithms"}, 0, 0, ENC, "list_dither" },
{ "antialiases", NULL, 0, AV_OPT_TYPE_CONST, {.str = "antialiases"},0, 0, ENC, "list_dither" },
{ "charsets", NULL, 0, AV_OPT_TYPE_CONST, {.str = "charsets"}, 0, 0, ENC, "list_dither" },
{ "colors", NULL, 0, AV_OPT_TYPE_CONST, {.str = "colors"}, 0, 0, ENC, "list_dither" },
{ NULL },
}
#define NULL
Definition: coverity.c:32
static void list_drivers(CACAContext *c)
Definition: caca.c:65
#define ENC
Definition: caca.c:203
static const char * window_title
Definition: ffplay.c:313
offset must point to two consecutive integers
Definition: opt.h:235
#define OFFSET(x)
Definition: caca.c:202

Definition at line 205 of file caca.c.

const AVClass caca_class
static
Initial value:
= {
.class_name = "caca outdev",
.item_name = av_default_item_name,
.option = options,
}
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static const AVOption options[]
Definition: caca.c:205

Definition at line 222 of file caca.c.

AVOutputFormat ff_caca_muxer
Initial value:
= {
.name = "caca",
.long_name = NULL_IF_CONFIG_SMALL("caca (color ASCII art) output device"),
.priv_data_size = sizeof(CACAContext),
.audio_codec = AV_CODEC_ID_NONE,
.video_codec = AV_CODEC_ID_RAWVIDEO,
.priv_class = &caca_class,
}
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:701
static int caca_write_trailer(AVFormatContext *s)
Definition: caca.c:44
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98
static int caca_write_header(AVFormatContext *s)
Definition: caca.c:91
#define flags(name, subs,...)
Definition: cbs_av1.c:560
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:458
static int caca_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: caca.c:192
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:346
static const AVClass caca_class
Definition: caca.c:222

Definition at line 230 of file caca.c.