1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/*
* Copyright (c) 2012 Paul B Mahol
*
* 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
*/
#include <caca.h>
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avdevice.h"
typedef struct CACAContext {
AVClass *class;
AVFormatContext *ctx;
char *window_title;
int window_width, window_height;
caca_canvas_t *canvas;
caca_display_t *display;
caca_dither_t *dither;
char *algorithm, *antialias;
char *charset, *color;
char *driver;
char *list_dither;
int list_drivers;
} CACAContext;
static int caca_write_trailer(AVFormatContext *s)
{
CACAContext *c = s->priv_data;
av_freep(&c->window_title);
if (c->display) {
caca_free_display(c->display);
c->display = NULL;
}
if (c->dither) {
caca_free_dither(c->dither);
c->dither = NULL;
}
if (c->canvas) {
caca_free_canvas(c->canvas);
c->canvas = NULL;
}
return 0;
}
static void list_drivers(CACAContext *c)
{
const char *const *drivers = caca_get_display_driver_list();
int i;
av_log(c->ctx, AV_LOG_INFO, "Available drivers:\n");
for (i = 0; drivers[i]; i += 2)
av_log(c->ctx, AV_LOG_INFO, "%s : %s\n", drivers[i], drivers[i + 1]);
}
#define DEFINE_LIST_DITHER(thing, thing_str) \
static void list_dither_## thing(CACAContext *c) \
{ \
const char *const *thing = caca_get_dither_## thing ##_list(c->dither); \
int i; \
\
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]); \
}
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)
{
CACAContext *c = s->priv_data;
AVStream *st = s->streams[0];
AVCodecContext *encctx = st->codec;
int ret, bpp;
c->ctx = s;
if (c->list_drivers) {
list_drivers(c);
return AVERROR_EXIT;
}
if (c->list_dither) {
if (!strcmp(c->list_dither, "colors")) {
list_dither_color(c);
} else if (!strcmp(c->list_dither, "charsets")) {
list_dither_charset(c);
} else if (!strcmp(c->list_dither, "algorithms")) {
list_dither_algorithm(c);
} else if (!strcmp(c->list_dither, "antialiases")) {
list_dither_antialias(c);
} else {
av_log(s, AV_LOG_ERROR,
"Invalid argument '%s', for 'list_dither' option\n"
"Argument must be one of 'algorithms, 'antialiases', 'charsets', 'colors'\n",
c->list_dither);
return AVERROR(EINVAL);
}
return AVERROR_EXIT;
}
if ( s->nb_streams > 1
|| encctx->codec_type != AVMEDIA_TYPE_VIDEO
|| encctx->codec_id != AV_CODEC_ID_RAWVIDEO) {
av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
return AVERROR(EINVAL);
}
if (encctx->pix_fmt != AV_PIX_FMT_RGB24) {
av_log(s, AV_LOG_ERROR,
"Unsupported pixel format '%s', choose rgb24\n",
av_get_pix_fmt_name(encctx->pix_fmt));
return AVERROR(EINVAL);
}
c->canvas = caca_create_canvas(c->window_width, c->window_height);
if (!c->canvas) {
av_log(s, AV_LOG_ERROR, "Failed to create canvas\n");
ret = AVERROR(errno);
goto fail;
}
bpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[encctx->pix_fmt]);
c->dither = caca_create_dither(bpp, encctx->width, encctx->height,
bpp / 8 * encctx->width,
0x0000ff, 0x00ff00, 0xff0000, 0);
if (!c->dither) {
av_log(s, AV_LOG_ERROR, "Failed to create dither\n");
ret = AVERROR(errno);
goto fail;
}
#define CHECK_DITHER_OPT(opt) \
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; \
}
CHECK_DITHER_OPT(algorithm);
CHECK_DITHER_OPT(antialias);
CHECK_DITHER_OPT(charset);
CHECK_DITHER_OPT(color);
c->display = caca_create_display_with_driver(c->canvas, c->driver);
if (!c->display) {
av_log(s, AV_LOG_ERROR, "Failed to create display\n");
list_drivers(c);
ret = AVERROR(errno);
goto fail;
}
if (!c->window_width || !c->window_height) {
c->window_width = caca_get_canvas_width(c->canvas);
c->window_height = caca_get_canvas_height(c->canvas);
}
if (!c->window_title)
c->window_title = av_strdup(s->filename);
caca_set_display_title(c->display, c->window_title);
caca_set_display_time(c->display, av_rescale_q(1, st->codec->time_base, AV_TIME_BASE_Q));
return 0;
fail:
caca_write_trailer(s);
return ret;
}
static int caca_write_packet(AVFormatContext *s, AVPacket *pkt)
{
CACAContext *c = s->priv_data;
caca_dither_bitmap(c->canvas, 0, 0, c->window_width, c->window_height, c->dither, pkt->data);
caca_refresh_display(c->display);
return 0;
}
#define OFFSET(x) offsetof(CACAContext,x)
#define ENC AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "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_INT, {.i64=0}, 0, 1, ENC, "list_drivers" },
{ "true", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, ENC, "list_drivers" },
{ "false", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, ENC, "list_drivers" },
{ "list_dither", "list available dither options", OFFSET(list_dither), AV_OPT_TYPE_STRING, {.dbl=0}, 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 },
};
static const AVClass caca_class = {
.class_name = "caca_outdev",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_caca_muxer = {
.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,
.write_header = caca_write_header,
.write_packet = caca_write_packet,
.write_trailer = caca_write_trailer,
.flags = AVFMT_NOFILE,
.priv_class = &caca_class,
};
|
