static int parse_presentation_segment(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int64_t pts) { PGSSubContext *ctx = avctx->priv_data; int x, y, ret; int w = bytestream_get_be16(&buf); int h = bytestream_get_be16(&buf); ctx->presentation.pts = pts; av_dlog(avctx, "Video Dimensions %dx%d\n", w, h); ret = ff_set_dimensions(avctx, w, h); if (ret < 0) return ret; /* Skip 1 bytes of unknown, frame rate? */ buf++; ctx->presentation.id_number = bytestream_get_be16(&buf); /* * Skip 3 bytes of unknown: * state * palette_update_flag (0x80), * palette_id_to_use, */ buf += 3; ctx->presentation.object_number = bytestream_get_byte(&buf); ctx->presentation.composition_flag = 0; if (!ctx->presentation.object_number) return 0; /* * Skip 3 bytes of unknown: * object_id_ref (2 bytes), * window_id_ref, */ buf += 3; ctx->presentation.composition_flag = bytestream_get_byte(&buf); x = bytestream_get_be16(&buf); y = bytestream_get_be16(&buf); /* TODO If cropping, cropping_x, cropping_y, cropping_width, cropping_height (all 2 bytes).*/ av_dlog(avctx, "Subtitle Placement x=%d, y=%d\n", x, y); if (x > avctx->width || y > avctx->height) { av_log(avctx, AV_LOG_ERROR, "Subtitle out of video bounds. x = %d, y = %d, video width = %d, video height = %d.\n", x, y, avctx->width, avctx->height); x = 0; y = 0; } /* Fill in dimensions */ ctx->presentation.x = x; ctx->presentation.y = y; return 0; }