diff options
Diffstat (limited to 'libavdevice/caca.c')
| -rw-r--r-- | libavdevice/caca.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/libavdevice/caca.c b/libavdevice/caca.c new file mode 100644 index 0000000..ff54940 --- /dev/null +++ b/libavdevice/caca.c @@ -0,0 +1,241 @@ +/* + * 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) { + ret = AVERROR(errno); + av_log(s, AV_LOG_ERROR, "Failed to create canvas\n"); + goto fail; + } + + bpp = av_get_bits_per_pixel(av_pix_fmt_desc_get(encctx->pix_fmt)); + c->dither = caca_create_dither(bpp, encctx->width, encctx->height, + bpp / 8 * encctx->width, + 0x0000ff, 0x00ff00, 0xff0000, 0); + if (!c->dither) { + ret = AVERROR(errno); + av_log(s, AV_LOG_ERROR, "Failed to create dither\n"); + 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) { + ret = AVERROR(errno); + av_log(s, AV_LOG_ERROR, "Failed to create display\n"); + list_drivers(c); + 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, + .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT, +}; + +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, +}; |
