1/* 2 * Copyright (c) 2012 Paul B Mahol 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include <caca.h> 22#include "libavutil/opt.h" 23#include "libavutil/pixdesc.h" 24#include "avdevice.h" 25 26typedef struct CACAContext { 27 AVClass *class; 28 AVFormatContext *ctx; 29 char *window_title; 30 int window_width, window_height; 31 32 caca_canvas_t *canvas; 33 caca_display_t *display; 34 caca_dither_t *dither; 35 36 char *algorithm, *antialias; 37 char *charset, *color; 38 char *driver; 39 40 char *list_dither; 41 int list_drivers; 42} CACAContext; 43 44static void caca_deinit(AVFormatContext *s) 45{ 46 CACAContext *c = s->priv_data; 47 48 if (c->display) { 49 caca_free_display(c->display); 50 c->display = NULL; 51 } 52 if (c->dither) { 53 caca_free_dither(c->dither); 54 c->dither = NULL; 55 } 56 if (c->canvas) { 57 caca_free_canvas(c->canvas); 58 c->canvas = NULL; 59 } 60} 61 62static void list_drivers(CACAContext *c) 63{ 64 const char *const *drivers = caca_get_display_driver_list(); 65 int i; 66 67 av_log(c->ctx, AV_LOG_INFO, "Available drivers:\n"); 68 for (i = 0; drivers[i]; i += 2) 69 av_log(c->ctx, AV_LOG_INFO, "%s: %s\n", drivers[i], drivers[i + 1]); 70} 71 72#define DEFINE_LIST_DITHER(thing, thing_str) \ 73static void list_dither_## thing(CACAContext *c) \ 74{ \ 75 const char *const *thing = caca_get_dither_## thing ##_list(c->dither); \ 76 int i; \ 77 \ 78 av_log(c->ctx, AV_LOG_INFO, "Available %s:\n", thing_str); \ 79 for (i = 0; thing[i]; i += 2) \ 80 av_log(c->ctx, AV_LOG_INFO, "%s: %s\n", thing[i], thing[i + 1]); \ 81} 82 83DEFINE_LIST_DITHER(color, "colors"); 84DEFINE_LIST_DITHER(charset, "charsets"); 85DEFINE_LIST_DITHER(algorithm, "algorithms"); 86DEFINE_LIST_DITHER(antialias, "antialias"); 87 88static int caca_write_header(AVFormatContext *s) 89{ 90 CACAContext *c = s->priv_data; 91 AVStream *st = s->streams[0]; 92 AVCodecParameters *encctx = st->codecpar; 93 int ret, bpp; 94 95 c->ctx = s; 96 if (c->list_drivers) { 97 list_drivers(c); 98 return AVERROR_EXIT; 99 } 100 if (c->list_dither) { 101 if (!strcmp(c->list_dither, "colors")) { 102 list_dither_color(c); 103 } else if (!strcmp(c->list_dither, "charsets")) { 104 list_dither_charset(c); 105 } else if (!strcmp(c->list_dither, "algorithms")) { 106 list_dither_algorithm(c); 107 } else if (!strcmp(c->list_dither, "antialiases")) { 108 list_dither_antialias(c); 109 } else { 110 av_log(s, AV_LOG_ERROR, 111 "Invalid argument '%s', for 'list_dither' option\n" 112 "Argument must be one of 'algorithms, 'antialiases', 'charsets', 'colors'\n", 113 c->list_dither); 114 return AVERROR(EINVAL); 115 } 116 return AVERROR_EXIT; 117 } 118 119 if ( s->nb_streams > 1 120 || encctx->codec_type != AVMEDIA_TYPE_VIDEO 121 || encctx->codec_id != AV_CODEC_ID_RAWVIDEO) { 122 av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n"); 123 return AVERROR(EINVAL); 124 } 125 126 if (encctx->format != AV_PIX_FMT_RGB24) { 127 av_log(s, AV_LOG_ERROR, 128 "Unsupported pixel format '%s', choose rgb24\n", 129 av_get_pix_fmt_name(encctx->format)); 130 return AVERROR(EINVAL); 131 } 132 133 c->canvas = caca_create_canvas(c->window_width, c->window_height); 134 if (!c->canvas) { 135 ret = AVERROR(errno); 136 av_log(s, AV_LOG_ERROR, "Failed to create canvas\n"); 137 return ret; 138 } 139 140 bpp = av_get_bits_per_pixel(av_pix_fmt_desc_get(encctx->format)); 141 c->dither = caca_create_dither(bpp, encctx->width, encctx->height, 142 bpp / 8 * encctx->width, 143 0x0000ff, 0x00ff00, 0xff0000, 0); 144 if (!c->dither) { 145 ret = AVERROR(errno); 146 av_log(s, AV_LOG_ERROR, "Failed to create dither\n"); 147 return ret; 148 } 149 150#define CHECK_DITHER_OPT(opt) do { \ 151 if (caca_set_dither_##opt(c->dither, c->opt) < 0) { \ 152 ret = AVERROR(errno); \ 153 av_log(s, AV_LOG_ERROR, "Failed to set value '%s' for option '%s'\n", \ 154 c->opt, #opt); \ 155 return ret; \ 156 } \ 157} while (0) 158 159 CHECK_DITHER_OPT(algorithm); 160 CHECK_DITHER_OPT(antialias); 161 CHECK_DITHER_OPT(charset); 162 CHECK_DITHER_OPT(color); 163 164 c->display = caca_create_display_with_driver(c->canvas, c->driver); 165 if (!c->display) { 166 ret = AVERROR(errno); 167 av_log(s, AV_LOG_ERROR, "Failed to create display\n"); 168 list_drivers(c); 169 return ret; 170 } 171 172 if (!c->window_width || !c->window_height) { 173 c->window_width = caca_get_canvas_width(c->canvas); 174 c->window_height = caca_get_canvas_height(c->canvas); 175 } 176 177 if (!c->window_title) 178 c->window_title = av_strdup(s->url); 179 caca_set_display_title(c->display, c->window_title); 180 caca_set_display_time(c->display, av_rescale_q(1, st->time_base, AV_TIME_BASE_Q)); 181 182 return 0; 183} 184 185static int caca_write_packet(AVFormatContext *s, AVPacket *pkt) 186{ 187 CACAContext *c = s->priv_data; 188 189 caca_dither_bitmap(c->canvas, 0, 0, c->window_width, c->window_height, c->dither, pkt->data); 190 caca_refresh_display(c->display); 191 192 return 0; 193} 194 195#define OFFSET(x) offsetof(CACAContext,x) 196#define ENC AV_OPT_FLAG_ENCODING_PARAM 197 198static const AVOption options[] = { 199 { "window_size", "set window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL }, 0, 0, ENC}, 200 { "window_title", "set window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, ENC }, 201 { "driver", "set display driver", OFFSET(driver), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, ENC }, 202 { "algorithm", "set dithering algorithm", OFFSET(algorithm), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC }, 203 { "antialias", "set antialias method", OFFSET(antialias), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC }, 204 { "charset", "set charset used to render output", OFFSET(charset), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC }, 205 { "color", "set color used to render output", OFFSET(color), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC }, 206 { "list_drivers", "list available drivers", OFFSET(list_drivers), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, ENC }, 207 { "list_dither", "list available dither options", OFFSET(list_dither), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 1, ENC, "list_dither" }, 208 { "algorithms", NULL, 0, AV_OPT_TYPE_CONST, {.str = "algorithms"}, 0, 0, ENC, "list_dither" }, 209 { "antialiases", NULL, 0, AV_OPT_TYPE_CONST, {.str = "antialiases"},0, 0, ENC, "list_dither" }, 210 { "charsets", NULL, 0, AV_OPT_TYPE_CONST, {.str = "charsets"}, 0, 0, ENC, "list_dither" }, 211 { "colors", NULL, 0, AV_OPT_TYPE_CONST, {.str = "colors"}, 0, 0, ENC, "list_dither" }, 212 { NULL }, 213}; 214 215static const AVClass caca_class = { 216 .class_name = "caca outdev", 217 .item_name = av_default_item_name, 218 .option = options, 219 .version = LIBAVUTIL_VERSION_INT, 220 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT, 221}; 222 223const AVOutputFormat ff_caca_muxer = { 224 .name = "caca", 225 .long_name = NULL_IF_CONFIG_SMALL("caca (color ASCII art) output device"), 226 .priv_data_size = sizeof(CACAContext), 227 .audio_codec = AV_CODEC_ID_NONE, 228 .video_codec = AV_CODEC_ID_RAWVIDEO, 229 .write_header = caca_write_header, 230 .write_packet = caca_write_packet, 231 .deinit = caca_deinit, 232 .flags = AVFMT_NOFILE, 233 .priv_class = &caca_class, 234}; 235