static int teletext_init_decoder(AVCodecContext *avctx) { TeletextContext *ctx = avctx->priv_data; unsigned int maj, min, rev; vbi_version(&maj, &min, &rev); if (!(maj > 0 || min > 2 || min == 2 && rev >= 26)) { av_log(avctx, AV_LOG_ERROR, "decoder needs zvbi version >= 0.2.26.\n"); return AVERROR_EXTERNAL; } if (ctx->format_id == 0) { avctx->width = 41 * BITMAP_CHAR_WIDTH; avctx->height = 25 * BITMAP_CHAR_HEIGHT; } ctx->dx = NULL; ctx->vbi = NULL; ctx->pts = AV_NOPTS_VALUE; #ifdef DEBUG { char *t; ctx->ex = vbi_export_new("text", &t); } #endif av_log(avctx, AV_LOG_VERBOSE, "page filter: %s\n", ctx->pgno); return (ctx->format_id == 1) ? ff_ass_subtitle_header_default(avctx) : 0; }