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 != CODEC_ID_RAWVIDEO) { av_log(s, AV_LOG_ERROR, "Only supports one rawvideo stream\n"); return AVERROR(EINVAL); } if (encctx->pix_fmt != 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"); return AVERROR(errno); } 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); caca_free_canvas(c->canvas); return AVERROR(errno); } 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); } 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); 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; }