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n4.3.9
libavdevice/caca.c
241 строка
9 KB
Jun Zhao
libavdevice: Update the class name as uniform style
15 авг 2019, 04:29
15 авг 2019, 04:29
3aeb681
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/* * 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]; AVCodecParameters *encctx = st->codecpar; 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->format != AV_PIX_FMT_RGB24) { av_log(s, AV_LOG_ERROR, "Unsupported pixel format '%s', choose rgb24\n", av_get_pix_fmt_name(encctx->format)); 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->format)); 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) 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) 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->url); 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_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 }, }; 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, };