242 lines
8.9 KiB
C
242 lines
8.9 KiB
C
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/*
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <caca.h>
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avdevice.h"
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typedef struct CACAContext {
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AVClass *class;
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AVFormatContext *ctx;
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char *window_title;
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int window_width, window_height;
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caca_canvas_t *canvas;
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caca_display_t *display;
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caca_dither_t *dither;
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char *algorithm, *antialias;
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char *charset, *color;
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char *driver;
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char *list_dither;
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int list_drivers;
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} CACAContext;
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static int caca_write_trailer(AVFormatContext *s)
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{
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CACAContext *c = s->priv_data;
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av_freep(&c->window_title);
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if (c->display) {
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caca_free_display(c->display);
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c->display = NULL;
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}
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if (c->dither) {
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caca_free_dither(c->dither);
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c->dither = NULL;
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}
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if (c->canvas) {
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caca_free_canvas(c->canvas);
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c->canvas = NULL;
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}
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return 0;
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}
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static void list_drivers(CACAContext *c)
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{
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const char *const *drivers = caca_get_display_driver_list();
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int i;
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av_log(c->ctx, AV_LOG_INFO, "Available drivers:\n");
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for (i = 0; drivers[i]; i += 2)
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av_log(c->ctx, AV_LOG_INFO, "%s: %s\n", drivers[i], drivers[i + 1]);
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}
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#define DEFINE_LIST_DITHER(thing, thing_str) \
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static void list_dither_## thing(CACAContext *c) \
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{ \
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const char *const *thing = caca_get_dither_## thing ##_list(c->dither); \
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int i; \
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\
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av_log(c->ctx, AV_LOG_INFO, "Available %s:\n", thing_str); \
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for (i = 0; thing[i]; i += 2) \
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av_log(c->ctx, AV_LOG_INFO, "%s: %s\n", thing[i], thing[i + 1]); \
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}
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DEFINE_LIST_DITHER(color, "colors");
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DEFINE_LIST_DITHER(charset, "charsets");
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DEFINE_LIST_DITHER(algorithm, "algorithms");
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DEFINE_LIST_DITHER(antialias, "antialias");
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static int caca_write_header(AVFormatContext *s)
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{
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CACAContext *c = s->priv_data;
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AVStream *st = s->streams[0];
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AVCodecParameters *encctx = st->codecpar;
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int ret, bpp;
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c->ctx = s;
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if (c->list_drivers) {
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list_drivers(c);
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return AVERROR_EXIT;
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}
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if (c->list_dither) {
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if (!strcmp(c->list_dither, "colors")) {
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list_dither_color(c);
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} else if (!strcmp(c->list_dither, "charsets")) {
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list_dither_charset(c);
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} else if (!strcmp(c->list_dither, "algorithms")) {
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list_dither_algorithm(c);
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} else if (!strcmp(c->list_dither, "antialiases")) {
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list_dither_antialias(c);
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} else {
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av_log(s, AV_LOG_ERROR,
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"Invalid argument '%s', for 'list_dither' option\n"
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"Argument must be one of 'algorithms, 'antialiases', 'charsets', 'colors'\n",
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c->list_dither);
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return AVERROR(EINVAL);
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}
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return AVERROR_EXIT;
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}
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if ( s->nb_streams > 1
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|| encctx->codec_type != AVMEDIA_TYPE_VIDEO
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|| encctx->codec_id != AV_CODEC_ID_RAWVIDEO) {
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av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n");
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return AVERROR(EINVAL);
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}
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if (encctx->format != AV_PIX_FMT_RGB24) {
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av_log(s, AV_LOG_ERROR,
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"Unsupported pixel format '%s', choose rgb24\n",
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av_get_pix_fmt_name(encctx->format));
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return AVERROR(EINVAL);
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}
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c->canvas = caca_create_canvas(c->window_width, c->window_height);
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if (!c->canvas) {
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ret = AVERROR(errno);
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av_log(s, AV_LOG_ERROR, "Failed to create canvas\n");
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goto fail;
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}
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bpp = av_get_bits_per_pixel(av_pix_fmt_desc_get(encctx->format));
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c->dither = caca_create_dither(bpp, encctx->width, encctx->height,
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bpp / 8 * encctx->width,
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0x0000ff, 0x00ff00, 0xff0000, 0);
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if (!c->dither) {
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ret = AVERROR(errno);
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av_log(s, AV_LOG_ERROR, "Failed to create dither\n");
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goto fail;
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}
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#define CHECK_DITHER_OPT(opt) do { \
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if (caca_set_dither_##opt(c->dither, c->opt) < 0) { \
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ret = AVERROR(errno); \
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av_log(s, AV_LOG_ERROR, "Failed to set value '%s' for option '%s'\n", \
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c->opt, #opt); \
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goto fail; \
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} \
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} while (0)
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CHECK_DITHER_OPT(algorithm);
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CHECK_DITHER_OPT(antialias);
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CHECK_DITHER_OPT(charset);
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CHECK_DITHER_OPT(color);
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c->display = caca_create_display_with_driver(c->canvas, c->driver);
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if (!c->display) {
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ret = AVERROR(errno);
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av_log(s, AV_LOG_ERROR, "Failed to create display\n");
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list_drivers(c);
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goto fail;
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}
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if (!c->window_width || !c->window_height) {
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c->window_width = caca_get_canvas_width(c->canvas);
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c->window_height = caca_get_canvas_height(c->canvas);
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}
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if (!c->window_title)
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c->window_title = av_strdup(s->url);
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caca_set_display_title(c->display, c->window_title);
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caca_set_display_time(c->display, av_rescale_q(1, st->codec->time_base, AV_TIME_BASE_Q));
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return 0;
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fail:
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caca_write_trailer(s);
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return ret;
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}
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static int caca_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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CACAContext *c = s->priv_data;
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caca_dither_bitmap(c->canvas, 0, 0, c->window_width, c->window_height, c->dither, pkt->data);
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caca_refresh_display(c->display);
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return 0;
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}
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#define OFFSET(x) offsetof(CACAContext,x)
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#define ENC AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "window_size", "set window forced size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL }, 0, 0, ENC},
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{ "window_title", "set window title", OFFSET(window_title), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, ENC },
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{ "driver", "set display driver", OFFSET(driver), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, ENC },
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{ "algorithm", "set dithering algorithm", OFFSET(algorithm), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC },
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{ "antialias", "set antialias method", OFFSET(antialias), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC },
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{ "charset", "set charset used to render output", OFFSET(charset), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC },
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{ "color", "set color used to render output", OFFSET(color), AV_OPT_TYPE_STRING, {.str = "default" }, 0, 0, ENC },
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{ "list_drivers", "list available drivers", OFFSET(list_drivers), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, ENC },
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{ "list_dither", "list available dither options", OFFSET(list_dither), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 1, ENC, "list_dither" },
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{ "algorithms", NULL, 0, AV_OPT_TYPE_CONST, {.str = "algorithms"}, 0, 0, ENC, "list_dither" },
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{ "antialiases", NULL, 0, AV_OPT_TYPE_CONST, {.str = "antialiases"},0, 0, ENC, "list_dither" },
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{ "charsets", NULL, 0, AV_OPT_TYPE_CONST, {.str = "charsets"}, 0, 0, ENC, "list_dither" },
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{ "colors", NULL, 0, AV_OPT_TYPE_CONST, {.str = "colors"}, 0, 0, ENC, "list_dither" },
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{ NULL },
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};
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static const AVClass caca_class = {
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.class_name = "caca outdev",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
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};
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AVOutputFormat ff_caca_muxer = {
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.name = "caca",
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.long_name = NULL_IF_CONFIG_SMALL("caca (color ASCII art) output device"),
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.priv_data_size = sizeof(CACAContext),
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.audio_codec = AV_CODEC_ID_NONE,
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.video_codec = AV_CODEC_ID_RAWVIDEO,
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.write_header = caca_write_header,
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.write_packet = caca_write_packet,
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.write_trailer = caca_write_trailer,
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.flags = AVFMT_NOFILE,
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.priv_class = &caca_class,
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};
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